帮忙看看我的DLL，为什么不成功？

kuangjingbo 2004-03-14 08:44:33

/////////////////////////////////////////////////////////////////
//我的DLL工程，生成TheDLL.dll文件
/////////////////////////////////////////////////////////////////
#include <windows.h>

#ifdef __cplusplus
#define EXPORT extern "C" __declspec(dllexport)
#else
#define EXPORT __declspec(dllexport)
#endif

int rtnValue=0;

EXPORT void CALLBACK Set(int n)；//把n的值传给rtnValue
EXPORT int CALLBACK Get()；//返回rtnValue的值

BOOL WINAPI DllMain(HINSTANCE hInstance,DWORD dwReason,LPVOID lpvReserved)
{
return TRUE;
}

EXPORT void CALLBACK Set(int n)
{
rtnValue=n;
}

EXPORT int CALLBACK Get()
{
return rtnValue;
}

///////////////////////////////////////////////////////
//我的.exe文件，用来调用.DLL文件
///////////////////////////////////////////////////////
#include <windows.h>

typedef void (CALLBACK * PFNSET)(int);
typedef int (CALLBACK * PFNGET)();

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd)
{
TCHAR buffer[100];
HANDLE hLibrary;
PFNSET pfnSet;
PFNGET pfnGet;
unsigned long error;

if(NULL==(hLibrary=LoadLibrary(TEXT("TheDLL.dll"))))
{
error=GetLastError();
MessageBox(NULL,TEXT("LOAD DLL ERROR"),TEXT("ERROR"),MB_OK);
return 0;
}

if(NULL==(pfnSet=(PFNSET)GetProcAddress(hLibrary,TEXT("Set"))))
{
error=GetLastError();
MessageBox(NULL,TEXT("LOAD FUNCTION Set ERROR"),TEXT("ERROR"),MB_OK);
return 0;
}

if(NULL==(pfnGet= (PFNGET)GetProcAddress(hLibrary,TEXT("Get"))))
{
error=GetLastError();
MessageBox(NULL,TEXT("LOAD FUNCTION Get ERROR"),TEXT("ERROR"),MB_OK);
return 0;
}

(* pfnSet)(100);
wsprintf(buffer,TEXT("%d"),(int)(pfnGet)());
MessageBox(NULL,buffer,TEXT("TEST"),MB_OK);

if(hLibrary)
FreeLibrary(hLibrary);
return 0;

}

...全文

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kuangjingbo 2004-03-14

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感谢大家了

kuangjingbo 2004-03-14

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谢谢大家
我知道了，我用了depends工具，查到了里面的情况
现在基本上明白了

ross33123 2004-03-14

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噢，我知道了，DLL是《windows程序设计》里的EXE是你自己的对吗？

薛定谔之死猫 2004-03-14

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是调用约定问题
__cdecl
This is the default calling convention for C and C++ programs.The stack is cleaned up by the caller.
__stdcall
The __stdcall calling convention is used to call Win32 API functions. The callee cleans the stack.
具体介绍：
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang/html/_core___stdcall.asp

rivershan 2004-03-14

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use .def file

ross33123 2004-03-14

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你的《windows程序设计》可能比较老了

rivershan 2004-03-14

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name mangling 的原因

ross33123 2004-03-14

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The __stdcall calling convention is used to call Win32 API functions. The callee cleans the stack, so the compiler makes vararg functions __cdecl. Functions that use this calling convention require a function prototype. The following list shows the implementation of this calling convention.

Argument-passing order -- Right to left.
Argument-passing convention -- By value, unless a pointer or reference type is passed.
Stack-maintenance responsibility -- Called function pops its own arguments from the stack.
Name-decoration convention -- An underscore (_) is prefixed to the name. The name is followed by the at sign (@) followed by the number of bytes (in decimal) in the argument list. Therefore, the function declared as int func( int a, double b ) is decorated as follows: _func@12
Case-translation convention None

薛定谔之死猫 2004-03-14