使用intel编译器编译DLL时出错

问题描述

我试图从控制台编译DLL，而不使用任何IDE并面临下一个错误。

I'm trying to compile DLL from console, without using any IDE and faced with next error.

我写了这个代码：

test_dll.cpp

#include <windows.h>
#define DLL_EI __declspec(dllexport)

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fwdreason, LPVOID lpvReserved){
  return 1;
}
extern "C" int DLL_EI func (int a, int b){
  return a + b;
}

然后使用命令 icl / LD test_dll.cpp 。我试图从另一个程序调用 func ：

Then compiled with command icl /LD test_dll.cpp. And I'm trying to call this func from another program:

prog.cpp

int main(){
  HMODULE hLib;
  hLib = LoadLibrary("test_dll.dll");
  double (*pFunction)(int a, int b);
  (FARPROC &)pFunction = GetProcAddress(hLib, "Function");
  printf("begin\n");
  Rss = pFunction(1, 2);
}

使用 icl prog.cpp 。然后我运行它，它失败与标准窗口程序不工作。

Compile it with icl prog.cpp. Then I run it, and it fails with standard window "Program isn't working". Maybe there is a segmentation fault error.

我做错了什么？

推荐答案

检查 LoadLibrary（）和 GetProcAddress（）成功这种情况下，它们绝对不会作为导出的函数调用 func ，而不是Function GetProcAddress（）意味着当尝试调用它时，函数指针将是 NULL 。

Check that both LoadLibrary() and GetProcAddress() succeed, in this case they definitely will not as the exported function is called func, not "Function" as specified in the argument to GetProcAddress() meaning the function pointer will be NULL when the attempt to invoke it is made.

函数指针的签名也不匹配导出函数的签名，导出的函数返回一个 int ，函数指针正在等待 double 。

The signature of the function pointer also does not match the signature of the exported function, the exported function returns an int and the function pointer is expecting a double.

例如：

typedef int (*func_t)(int, int);

HMODULE hLib = LoadLibrary("test_dll.dll");
if (hLib)
{
    func_t pFunction = (func_t)GetProcAddress(hLib, "func");
    if (pFunction)
    {
        Rss = pFunction(1, 2);
    }
    else
    {
        // Check GetLastError() to determine
        // reason for failure.
    }
    FreeLibrary(hLib);
}
else
{
    // Check GetLastError() to determine
    // reason for failure.
}

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