Delphi 4 string functions. Such code will work properly across .

Delphi 4 string functions Related commands Nov 20, 2015 · What's wrong with using the built-in Length() function? A string knows how many Char elements it holds, Length() simply returns that value as-is. Oct 21, 2013 · i believe for Delphi-7 you can write your own functions and use them transparently. 3 Rio still uses ARC object management for its mobile compilers, if the above code runs strictly on ARC platforms (iOS, Android) then it will not leak. string := Format('Updating report ( %d of %d, [1], [2])', loop, count ); but it is not possible. 5" type library and use IRegExp objects. Net 4. Notes: Strings are indexed with 1 for the first character (arrays start with 0 for the first element). There are three different constructor overloads. this is defintion of the pointer function in delphi that translate since header c++ Dec 6, 2020 · The video tutorial series will highlight various String functions such as Length, Concat, IntToStr, UpperCase, LowerCase, Trim, Copy, Insert. Here's a function that uses it. And validness here comes from the fact that (var Result: string) construction says that "I'm waiting for a valid variable that definetly was introduced Jan 31, 2025 · DBISAM's SQL provides string functions, numeric functions, boolean functions, aggregate functions (used in conjunction with an SQL SELECT GROUP BY clause), autoinc functions, full text indexing functions, and data conversion functions. Strings can be explicitly cast to a different string type. In Delphi terms that is PAnsiChar. Defines currency string placement in curr display functions: CurrencyString: The currency string used in currency display functions: CurrToStrF: Convert a currency value to a string with formatting: DecimalSeparator: The character used to display the decimal point: FloatToStrF: Convert a floating point value to a string with formatting: FormatCurr Mar 27, 2013 · I want to update a text like "Updating report (1 0f 5)". 23400000000000E+0001 Specifying a Width guarantees that the output string will be at least that wide, with left blank padding added as appropriate. The <string. txt' , and inside text Mar 21, 2015 · @David: Once you have split the string it is easy to get the needed operation from the delimiter following the current string. Dec 6, 2020 · The video aims to teach us how to use String functions to process and manipulate values in String variables in a new Delphi project. The problem is not particularly here but further. uses SysUtils; var val : String; begin val:= 'example'; ShowMessage(IntToStr(ByteLength(val))); end; Just know that ByteLength() only accepts a UnicodeString as input, so any string passed to it, whether that be a (Ansi|Wide|UTF8|RawByte|Unicode)String, will be converted to UTF-16 (if not already) and it will then return the byte count in UTF-16 Embarcadero Technologies 5 . Delphi string types memory layout is compatible with other languages (and viceversa), but strings must be allocated and deallocated using the same memory manager. So questions : Why does this work in . If you are basically doing "normal" sorts of string operations but need more speed you should start here first. But, you easily could provide the needed functionality with known functions (Pos also has an overloaded version with the third parameter in fresh Delphi): NPos = Length(S) - Length(Sub) + 1; if PosEx(Sub, S, NPos) = NPos then Apr 30, 2011 · Use StrRScan or AnsiStrRScan, both in the SysUtils unit. 1 for AnsiString and 2 for UnicodeString) and the charset (used for AnsiString) - as two word aggregated as one integer. I noted that Gabr's routines have not been updated to Delphi 2009. OP Edit. The Flags may be none, one, or both of these set values: You can mix strings (AnsiString and UnicodeString values) and null-terminated strings (PChar values) in expressions and assignments, and you can pass PChar values to functions or procedures that take string parameters. You can use the optional TFormatSettings parameter to define your own format. Jan 9, 2013 · FillChar will work fine for my function in all versions of Delphi because, as I noted, my function uses AnsiString. You are passing the same S variable for all of the parameters, including the output parameter, so the value of S gets wiped from memory before the parameter values are used inside the function. For string handling, we recommend that you use System. TStringHelper , which is supported on all platforms. function StrCopy(Dest: PAnsiChar; const Source: PAnsiChar): PAnsiChar; function StrCopy(Dest: PWideChar; const Source Nov 24, 2016 · I've got a report that's supposed to take a grid control and produce HTML output. I have found in a couple of places how to do this by declaring the array type, e. String Functions Dec 18, 2009 · actually i was opened question previously, but can't get answer what i exactly want, so i would like to ask again thanks All for example, i have some text file name is 'test. ByteLength() function:. e. Add also some of the OS X Foundation string functions, and you got something nice to work with. You only have to count the number of characters handled, which is just adding the length of each handled string plus 1 for each handled delimiter. Does anybody have faster functions that Delphi's that would do the same thing, just faster? The biggest file is 1GB with 35Mio Dec 20, 2008 · Delphi versions prior to Delphi 2009 do have Unicode support built in. You could also put all the characters in a string, or you could use Delphi's native set type. Jan 23, 2013 · A function return value of type string is actually treated by the compiler as an implicit var parameter. type TStringArray = array of string; And then declaring my function. For example, you can declare a string variable like this: var myString: string;. Components > Tools > Text. Oct 9, 2012 · I'm new in delphi, my program developed in delphi working with a dll developed in C++, I need working with pointer functions that throw exceptions of Access Violation address and after many test I don't know how resolve It. function Trim(const s: string; const c: array of Char): string; // Replace `s[x] = c` with `CharInArray(s[x], c)`. cccc-ccc-ccccc. Sven,G. So, you should either: fix those functions to operate on the full 8 bytes on all platforms, eg: Dec 23, 2017 · The function below works perfectly to convert string to hexadecimal: function String2Hex(const Buffer: AnsiString): string; begin SetLength(Result, Length(Buffer) * 2); BinToHex(@Buffer[1], Feb 14, 2013 · You could use the functions: TryStrToDate TryStrToTime TryStrToDateTime They try to convert a string to a date/time and if the conversion succeeds, it returns true. Mar 10, 2016 · Your S7 parameter is declared as an out parameter, so the compiler will set the passed variable to a blank string when the function is called. When the function begins execution, the Result variable contains whatever is in the local variable to which the return value will subsequently be assigned. Related commands Aug 28, 2012 · Note that the debugger tooltip for a plain string does not truncate at this length. The latter, despite its name, works on Unicode characters in the Delphi versions where string is UnicodeString. cccc-ccc-ccc. Hash. Nov 24, 2016 · I've got a report that's supposed to take a grid control and produce HTML output. This video will focus more on String functions – Length and Concat. I use a lots of Delete,Copy,Length and Pos function to handle strings. Otherwise use the standard Unicode strings. No, it does not. The video tutorial series will highlight various String functions such as Length, Concat, IntToStr, UpperCase, LowerCase, Trim, Copy, Insert. But strings passed by reference to a function or procedure (as the var and out parameters) must be of the appropriate type. Feb 8, 2012 · I haven't got the time to review all the code, but I do see that you're using a static IV set to all zero's. Oct 29, 2015 · String content = "Jane"; String container = 'A. ' s := StrMaxLen(S, 40) // Now s is 'This is a Dec 22, 2017 · In the second example, you are declaring a dynamic array of strings, but you are not allocating any memory for the array, and you are trying to assign its first element (which is a single string) to point at a fixed array of strings. I want something like this. Hash unit. WideString isn't as nice as the new UnicodeString type, but it still holds 16-bit Unicode characters, and you can type-cast it to PWideChar to send strings to Unicode API functions. Feb 4, 2019 · Here are Delphi string handling routines explained: declarations, descriptions, and examples. Returns true if a string exactly matches one of a list of strings Function : AnsiMidStr : Returns a substring from the middle characters of a string Function : AnsiPos : Find the position of one string in another Function : AnsiReplaceStr : Replaces a part of one string with another Function : AnsiReverseString : Reverses the sequence of Jul 7, 2014 · This topic lists the string types and links to the pages that list and describe the various string handling routines. if string has 8 chrs. Hash function for strings. Jan 14, 2018 · Your two function names are different. According to the function declaration documentation for the PAnsiChar and PWideChar types, the following. Delphi unicode strings are UTF-16 strings because this is the "native" Windows string type. The StringReplace function replaces the first or all occurences of a substring OldPattern in SourceString with NewPattern according to Flags settings. Pos. Aug 23, 2013 · This code throws the same heap exception in 4. You discard important bit of information which is the position of the character in the string. but i don't have D7 and cannot check. Copying one string to another. Base64 instance is constructed with default one. Aug 18, 2010 · But I found that this did not produce good numbers from Unicode strings. The WideString type has been available since Delphi 4, I think, maybe earlier. Jul 12, 2022 · 4. Nov 13, 2011 · Delphi allows to create variables that point to functions and then call the function through the variable. Jane,Jack'; // This is the string which i need to be searched with string content boolean containerContainsContent = StringUtils. '; end; var s: string; begin s := 'This is a string containing a lot of characters. The return value is more Jul 12, 2022 · 4. NetEncoding in your uses clause. I used widestring function because of unicode support, but it seems also string functions work with UTF-8 (probably it depends on version of Delphi, i used Turbo delhpi 7). Oct 6, 2021 · You should try to avoid encrypting/decrypting strings across multiple programming languages. Also a powerfull FastTagReplace function To replace in string tag like #tagname params1="value1" params2="value2"> by custom value Dec 10, 2013 · In a TDataset, you can loop through the Fields collection and construct the json output and then in the loop, check the fieldtype and encode the value accordingly. Until Delphi 2007, the encoding is Oct 21, 2010 · Some precision with the screen type: since Delphi 2009, there is a 3rd "extra integer", which codes the size (in byte) for every character in the string (i. The function load_for_edit() is supposed to return an array of strings which sounds like it does. function Trim(const s: string; const c: string): string; // Replace `s[x] = c` with `CharInString(s[x], s)`. You have a few different problems to contend with, the first among which is that your string indexes are mostly going to be off by one. Sep 17, 2014 · This exercise can be a lot trickier than might first appear because there are no hard and fast rules about proper names. SysUtils. type TStringArray = array of string; function load_for_edit(): TStringArray; numberOfFields: integer; Feb 18, 2013 · function StrMaxLen(const S: string; MaxLen: integer): string; var i: Integer; begin result := S; if Length(result) <= MaxLen then Exit; SetLength(result, MaxLen); for i := MaxLen downto MaxLen - 2 do result[i] := '. Typically, automatic processing against a set of rules (which you'll need to devise yourself) will leave a residue of 10+% which are either wrong or require manual massaging. Naming Conflicts . Delphi/C++Builder. function StrCopy(Dest: PAnsiChar; const Source: PAnsiChar): PAnsiChar; function StrCopy(Dest: PWideChar; const Source The Str procedure converts an integer or floating point Number into a string, with optional basic formatting control. Try showing the variant in a dialog box and you will see that the entire string is present. if string has 10 chrs. Mega Code Archive for Developers and Programmers. . There is no need to manually count the individual Char elements: function Strlen(textto: string): integer; begin Result := Length(textto); end; If you want to actually count them, the SysUtils unit has a StrLen() function for that purpose: function Jan 1, 2012 · You can't them outside Delphi, because VB, C++ and C# will each use their own memory manager. You should ideally use AnsiPos instead of Pos since the former supports wide character… Rich formatting of numbers and text into a string Function : FormatCurr : Rich formatting of a currency value into a string Function : FormatDateTime : Rich formatting of a TDateTime variable into a string Function : FormatFloat : Rich formatting of a floating point number into a string Function : High : Returns the highest value of a type or Jan 20, 2018 · Yes, there is: TBase64Encoding constructed with specific parameters. if string has String types can be mixed in assignments and expressions; the compiler automatically performs required conversions. PosEx is equivalent to System. The StrCopy function copies the value of one string to another. containsIgnoreCase(container, content); // I used to write like this in java. my current method is just adding all the ASCII numbers of the characters together and taking it mod the array size. String Functions Mar 18, 2016 · C# uses an array. This then allows you total flexibility from the caller side. function Feb 14, 2015 · Using System. The first parameter is the string that you want to hash and the second parameter is a boolean where you can specify whether you want the Hash String to be uppercase or lowercase. 5, however. cccc-ccc-cccc. DBISAM's SQL provides string functions, numeric functions, boolean functions, aggregate functions (used in conjunction with an SQL SELECT GROUP BY clause), autoinc functions, full text indexing functions, and data conversion functions. Delphi's equivilent is either PAnsiChar or PWideChar, depending on whether the DLL was compiled for Ansi or Unicode. In the newer versions of Delphi, you can use the THashMD5 record from the System. Benchmark is 130Mb file with 3Mio lines. Mar 31, 2017 · All other string usage including function(): string (that actually procedure(var Result: string) as Alexander correctly pointed out) just expects valid strings on the stack, not initialized. GetOutputDos vs. Apr 21, 2015 · All the hash functons has risk of collitions, but AFAIK one of the more secure is the SHA-1 algorithm, exist many delphi implementations, for example you can use the Jwscl library (JEDI Windows Security Code Lib) which is a wrapper for the Windows CryptoAPI (you can find a delphi sample on this question SHA1 hashing in Delphi XE) or use the TIdHashSHA1 class which is part of Indy. For the comprehensive Learn Delphi tutorial and to learn more about Delphi and Windows開発, feel free to watch the video above. If your function in your second code snippet is supposed to correspond as the implementation of the first one, then first of all they need to match names and signatures, and second of all you'd need the class name in front of the function name. But, you easily could provide the needed functionality with known functions (Pos also has an overloaded version with the third parameter in fresh Delphi): NPos = Length(S) - Length(Sub) + 1; if PosEx(Sub, S, NPos) = NPos then Jul 28, 2004 · Tek-Tips is the largest IT community on the Internet today! Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet! Returns true if a string contains a substring, case insensitive StrUtils : AnsiEndsStr : Returns true if a string ends with a substring StrUtils : AnsiIndexStr : Compares a string with a list of strings - returns match index StrUtils : AnsiLeftStr : Extracts characters from the left of a string SysUtils : AnsiLowerCase : Change upper case Extracts characters from the left of a string Function : AnsiLowerCase : Change upper case characters in a string to lower case Function : AnsiMatchStr : Returns true if a string exactly matches one of a list of strings Function : AnsiMidStr : Returns a substring from the middle characters of a string Function : AnsiPos : Find the position of Jan 17, 2025 · The C string functions are built-in functions that can be used for various operations and manipulations on strings. <g> – May 2, 2013 · In category. When this gets output to HTML, of course, it ends up blank. For UnicodeString, find a FillWord or FillWideChar Dec 4, 2020 · In this four-part Learn Delphi Video tutorial series, we will explore everything about String Variables and how to process and manipulate these String functions and procedures in a Delphi or windows app development Project. This leads me to believe the problem lies in the fact that in . [Call Format 3]: FloatToStr( f ): String; [Function]: Convert the real data f into a string, which is the return value of the function. Duplicate Best algorithm for evaluating a mathematical expression? Is there a built-in Delphi function which would convert a string such as '2*x+power(x,2)' or any equation to float? StrToFloat r Aug 10, 2018 · There are functions EndsStr() and EndsText() (the latter is case-insensitive) in the StrUtils unit. Aug 6, 2024 · Here are some key aspects of working with strings in Delphi: Declaring strings: Strings in Delphi are declared using the string data type. Assigning values: Strings can be assigned values using the assignment operator (:=) or string assignment functions like you code does not work because you are reading the content of the file using a unicode string as buffer, so you are just moving bytes from the internal buffer of the TFileStream to the unicode string ignoring the encoding. And then you are trying to pass that element (again, a single string) where an array is expected. Dec 6, 2016 · While processing takes place in a function, should the result of the function be typed as a pointer, or can it return a record variable? function MyFunctionWhichCalculates: TMyHugeRecord; // or function MyFunctionWhichCalculates: PMyHugeRecord; I mean in terms of performance, especially to avoid a stack overflow. i like this answer, and i went ahead and wrote a StringReplaceW function using RegEx: The HyperString freeware library addresses the shortcomings and inefficiencies of the native AnsiString function set included with Delphi. string is a regular string, which was single-byte (now called AnsiString) up until Delphi 2007, and multi-byte (now called UnicodeString) as of Delphi 2009. Jun 18, 2014 · I would like to make a effective coding of this problem function ADOConnectionWillExecute( Connection: TADOConnection; var CommandText: WideString; var CursorType: TCursorType; var LockType: Sep 8, 2020 · Note: Since Delphi 10. I have an option to have loop and count stored in a string and concatenate everything. The first part of the video already tackled Length and Concat() String functions while the second part discussed three Oct 29, 2014 · function IsSubStringAt(const needle, haystack: string; position: Integer): Boolean; var substr: string; begin substr := Copy(haystack, position, Length(needle)); Result := substr = needle; end; If performance was really critical then then you would want to perform the comparison in-place without creating a copy, and thereby performing heap Apr 13, 2013 · I'm working with Delphi 7. function Low(const S: AnsiString): integer; overload; begin end; - You would need 4 functions: Low/High and AnsiString/WideString - and i hope that overload keyword would do the trick, so you would have both stock Low/High for arrays and your own Low/High for strings Mar 12, 2010 · Post date: Mar 12, 2010 12:06:25 AM Mar 29, 2024 · Pos function (case-sensitive) The Pos function returns the position of a substring within a string. If you have a look on my web-site I have a whole strings routines unit (about 5,000 LOC) that works with both Delphi 2007 (non-Uniocde) and XE (Unicode) with only "string" interfaces and contains almost all of the conversion issues you might face. It fakes a pass by value in doing this. By default, floating point numbers are shown in Exponential format, as here: 1. Apr 7, 2010 · I generally import the "Microsoft VBScript Regular Expression 5. One of the columns in the grid can display any of a number of values, or <Any>. Nov 15, 2010 · For class and object functions (MyObject. Andreas did likewise on Delphi 4 and Rodrigo did so with Dec 20, 2008 · Delphi versions prior to Delphi 2009 do have Unicode support built in. cccc-ccc-cc. Jan 25, 2025 · sorry, i can't understand your question --- are you trying to make more than one property read from single universal function, or you are trying to build a record for converting strings to integers ? Strings can be assigned from other strings, from functions that return a string, and with concatenations as in the sample code. Default TNetEncoding. These string functions make it easier to perform tasks such as string copy, concatenation, comparison, length, etc. So, you can create your functions and assign a function to a properly typed attribute of the node (or you can assign functions to, for example, the handy data property of many collection items classes). 10 most used String functions & procedures Title: 10 most used String functions & procedures Question: Don't know what can you really do with a string? Mar 31, 2015 · You can use the SysUtils. if string has 11 chrs. h> header file contains these string functions. up to you). 5? Should I be concerned about NewStr()'s allocation in the native DLL? You could even write a Delphi function, register it with FastReport and call it from within the [. If the substring is found, Pos returns the 1-based index of the first occurrence of the substring; otherwise, it returns 0. It should be pretty easy to use a random IV and prepend that to the cipher text before encoding it in base 64. The possibilities really are endless. Feb 18, 2014 · Means, DLL can export functions with identical names. Description Powerfull stringreplace, Pos, Move, comparetext, uppercase, lowercase function. 87 Jul 16, 2014 · I have a function in my application that needs to return an array. The changed string is returned. Here's my base class. dll only exports one InterlockedExchangeAdd() function. 5, the marshaler is trying to FreeCoTaskMem() and that is what is throwing the exceptions. However, only zero or one helper applies in any specific location in source code. And since different programming languages handle strings differently stored data block representing string containing same characters in different programming languages might be different. ], passing a field from the dataset as a parameter. [Call Format 4]: StrToFloat( s ): Extended; [Function]: Convert string data s into real data, and use it as the return value of the function. The below table lists some of the most commonly used May 6, 2011 · When the string gets changed (and only then) Delphi makes a copy of the string, decreases the reference count of the passed string and uses the copy in the rest of the routine. The JNA documentation explains that Java String is mapped to a pointer to a null-terminated array of 8 bit characters. Delphi is declaring 2 overloads of InterlockedExchangeAdd() with different parameters, but kernel32. I used it to format a strings in UTF-8-encoded xml file. I thought format function will help me to do that. But if the code must run on non-ARC platforms (Windows, Linux, macOS), or is ever upgraded to Delphi 10. Then I discovered HashNameMBCS in SysUtils of Delphi 2009 and translated it to this simple function (where "string" is a Delphi 2009 Unicode string): Sep 20, 2013 · BlaXpirit: what prevents you from writing a Python-like library with similar string functions? Syntax may be different, but the results and ease of use could be the same. (If you still need the "real" Ansi version, use the AnsiStrings unit. Important: Some string types are not supported on all platforms. About passing by reference (pointer) When the string is passed as a const or var, Delphi also passes a reference (pointer), however: If I assume correctly that your dir variable is a string, then you can cast the string to be a PChar, and call ShellExecute as follows: ShellExecute(Handle,'open', PChar(dir) ,nil,nil,sw_Show); Share Extracts characters from the left of a string Function : AnsiMatchStr : Returns true if a string exactly matches one of a list of strings Function : AnsiMidStr : Returns a substring from the middle characters of a string Function : AnsiPos : Find the position of one string in another Function : AnsiReplaceStr : Replaces a part of one string Jun 13, 2018 · Having noted my reservations about this kind of "encryption", let me actually answer the question. So you can change the input parameter in your Pascal code from string to PAnsiChar. Jun 13, 2019 · For 64bit POSIX platforms like Linux and iOS, it is 8 bytes, for other platforms it is 4 bytes. 0 and not 4. g. I checked this out on Delphi 6 and there was no truncation with your code (other than the debugger tooltip). Function) this can be done with RTTI, but it's a lot of work. It has a maximum of 255 characters (depending on the #), and the encoding is undetermined (i. The documentation says this:. At most one helper can active at any one point in your code. Dec 27, 2012 · A Delphi or FreePascal string is a managed type that cannot be used as a JNA type. 4, then Free needs to be called. Function StrCopy. Apr 12, 2014 · I would like to use the Format function to format it such that after first 4 characters a hyphen to be inserted and after next 3 characters another hyphen to be inserted: cccc-ccc-c. ) Jul 28, 2004 · Tek-Tips is the largest IT community on the Internet today! Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet! Nov 12, 2013 · LPTSTR is just a pointer to raw character data. Jul 4, 2013 · Thanks this helped me alot. I am new to Delphi. Jan 4, 2004 · Tek-Tips is the largest IT community on the Internet today! Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet! Oct 12, 2016 · string[#] are subtypes of ShortString. " So there should not be a difference between the latter two. Jan 31, 2025 · How to Decrypt String in Delphi? To decrypt a string in Delphi, you can use various cryptographic algorithms such as DES, AES, or RSA. Classes and the unit System. Is there any Delphi D2010 function like PosEx that finds a sub-string inside a string starting from the end of the string? I'm removing all the calls to the FastStrings library and one of the functions I was using was FastPosBack: Feb 13, 2012 · Just replace function definition with: function BytesToHex(const aSource: array of Byte): string;. All functions are defined in SysUtils. Such code will work properly across Sep 7, 2005 · Hi I have a big process to handle data from file. Here is an example using the AES algorithm: First, you need to include the unit System. Jun 3, 2013 · UStrCmp also uses a pure binary comparison: "Strings are compared according to the ordinal values that make up the characters that make up the string. Strings can be assigned from other strings, from functions that return a string, and with concatenations as in the sample code. function SomeFunction(SomeParam: Integer): TStringArray; Jul 5, 2022 · Normally, a function returns a normal data type, like a string, eg: Function getInitials(sName,sSurname:string) :string Begin Result := sName [1]+sSurname [1] End And is called like this: var s: string; s := getInitials (John, Wick); // s will have the value 'JW' As you can see, the Result is assigned a value using :=. If you just need to call one particular type of functions (say, function(integer, integer): string), it's a lot easier. GetDosOutput. So there are no exceptions raised. VCL components; Database/SQL; Reports, printing; Email, Internet Nov 24, 2011 · Jenkins hash function should help you get started. Why? Encryption/decryption is generally done on RAW data. You can define and associate multiple helpers with a single type. Also, your LongEndian() function only swaps 4 bytes despite operating on an 8-byte UInt64. if string has 9 chrs. LPTSTR is always Ansi in Delphi 2007 and earlier (which includes Delphi 7) and always Unicode in Delphi 2009 and later, so you may need to account for that. hywh ngctleh rklrr kupajub kxjrk iinkijt stbz ofqz kujqo tbid ussqkq pugo vpd wdt tsegtkt