C++ 调用 delphi dll

最新推荐文章于 2024-06-06 16:23:58 发布

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最新推荐文章于 2024-06-06 16:23:58 发布

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本文介绍如何使用Delphi创建DLL并导出stdcall函数，包括整数加法和字符串处理功能，并演示了如何通过C++加载和调用这些DLL函数。

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说明：

delphi 导出请加stdcall

---------------------- Delphi --------------------------

library DepDll;

{ Important note about DLL memory management: ShareMem must be the
  first unit in your library's USES clause AND your project's (select
  Project-View Source) USES clause if your DLL exports any procedures or
  functions that pass strings as parameters or function results. This
  applies to all strings passed to and from your DLL--even those that
  are nested in records and classes. ShareMem is the interface unit to
  the BORLNDMM.DLL shared memory manager, which must be deployed along
  with your DLL. To avoid using BORLNDMM.DLL, pass string information
  using PChar or ShortString parameters. }

uses
  SysUtils,
  Classes;

//加法测试
Function TestAdd(p1, p2 : Integer):Integer;stdcall;
begin
  Result:=p1+p2;
end;

//字符串输入与输出测试
Function ShowString(s1, s2:PChar; pOut:PChar):Integer;stdcall;
var
strRes:String;
begin
  strRes:='this is from delphi s1：'+ StrPas(s1) + ' s2:' + StrPas(s2);
  Move(strRes[1], pOut^, Length(strRes));
end;

{$R *.res}

//函数导出
exports
  TestAdd,ShowString;

begin
end.

---------------------- C++ ----------------------

CString strPath = _T("D:\\Program Files (x86)\\Borland\\Delphi7\\Projects\\DepDll.dll");

	HINSTANCE hUKey = LoadLibrary(strPath);
	if (hUKey != NULL){
		//参数为整型的加法测试
		{
			int nRes;
			typedef int(__stdcall *TADD)(int, int);
			TADD pAdd = (TADD)GetProcAddress(hUKey, "TestAdd");
			if (pAdd != 0){
				nRes = pAdd(100, 123);
			}
		}

		//参数为字符串的字符串测试
		{
			int nRes;
			typedef int(__stdcall *SHOWSTR)(char*, char*, char*);
			SHOWSTR pShowStr = (SHOWSTR)GetProcAddress(hUKey, "ShowString");
			char* pBuf = new char[512];
			memset(pBuf, 0, 512);
			if (pShowStr != 0){
				nRes = pShowStr("2018 delphi", "param 2", pBuf);
			}
			delete[] pBuf;
		}

		FreeLibrary(hUKey);
	}