2009年11月26日 · PChar is a pointer to a "char", whatever that happens to be. In D2009 and later, Char means a UnicodeChar. Before that, Char was an AnsiChar. The difference is that if you're using D2007 and migrate to a later version, the definition of PChar will change, while the definition of PAnsiChar will not.

Whether you are using a Unicode Delphi or not is essential to know for interop code using PChar because PChar floats between AnsiChar and WideChar depending on the version of Delphi. I've assumed that you use Unicode Delphi. If not then you'd need to change the string marshalling at the P/Invoke side.

Similarly, Char type is now WideChar, a two-byte character type, and PChar is a PWideChar, a pointer to a two-byte Char. The significant point about the changes to these basic data types is that, at a minimum, each character is represented by at least one code unit (two bytes), and sometimes more.

2010年11月25日 · I have a DLL in which I have a function that returns a pchar. (as to avoid having to use borlndmm) What I was doing originally was casting a string as a pchar and returning that. Result := pChar(SomeFuncThatReturnsString) But I was getting expected results 90% of the time and the other times I would get back nothing.

2020年12月29日 · PCHAR is a typedef that resolves to char*, so PCHAR* means char**. TCHAR is a macro #define 'd to either the "wide" wchar_t or the "narrow" char . In neither case can you (safely) convert between a char ** and a simple character pointer, so the following assumes the question is actually about converting a PCHAR to a TCHAR* .

2008年11月12日 · With Delphi 2007 and previous versions, s := PChar(Application.ExeName) would return the application exe path. with Delphi 2009, s := PAnsiChar(Application.ExeName) returns only 'E'. My guess is that's because I'm converting a unicode string to an ansi string but how can I convert it so that a PAnsiChar gets the full string?

2012年10月15日 · PChar is a pointer to char, but it receives special support from the compiler to allow pointer arithmetic to make C-like string manipulations easier in Delphi. PByte is just a plain old typed pointer, and does not receive any special …

2015年8月28日 · The PChar is an alias of PAnsiChar in Delphi 6 and stands for a PWideChar in Delphi XE8. You can solve this issue at line #8 declaring you function (and calling it accordingly) like this: function UTF8ToStringLen(const src: PAnsiChar; const Len: Cardinal): WideString;

2012年8月7日 · As title states, I need a way to convert a PWCHAR to a std::string. The only solutions I can find online are for the opposite conversion, so I'd really like it if someone could shed some light on t...

2015年4月4日 · It works for me. I've just replaced PChar with PAnsiChar and string with AnsiString and tried the code you posted. The problem is now that you're downloading a web site instead of a GIT installer binary. Check the content of the downloaded file. It's a HTML document. –