---

環境：Dev-C++ 5.7.1
Compiler Options：TDM-GCC 4.8.1 64-bit Release

  MinGW\lib

  MinGW\bin

DLL_Project：裡頭兩個檔案分別是 dll.h 和 dllmain.cpp
使用DLL：run_dll.cpp

Compile → dllmain.cpp 產生 .dll 檔

→ run_dll.cpp 產生 .exe 檔

執行 run_dll.exe 顯示 The result is 30.000000 (呼叫.dll內的函式成功)

dll.h 程式碼：
#ifndef _DLL_H_
#define _DLL_H_

#if BUILDING_DLL
#define DLLIMPORT __declspec(dllexport)
#else
#define DLLIMPORT __declspec(dllimport)
#endif

extern "C"
{
   __declspec(dllexport) double AddNumbers(double a, double b);
}

#endif

dllmain.cpp 程式碼：
/* Replace "dll.h" with the name of your header */
#include "dll.h"
#include <windows.h>
#include <iostream>

__declspec(dllexport) double AddNumbers(double a, double b){

return a+b;
}

run_dll.cpp 程式碼：
#include "dll.h"
#include <windows.h>
#include <cstdio>
 
// DLL function signature  
typedef double (*importFunction)(double, double);  
 
int main() {  
    importFunction addNumbers;  
    double result;  
 
    // Load DLL file  
    HINSTANCE hinstLib = LoadLibrary(".\\hi.dll");
    if (hinstLib == NULL) {  
        printf("ERROR: unable to load DLL\n");  
        system("pause");  
        return 1;  
    }  
 
    // Get function pointer  
    addNumbers = (importFunction)GetProcAddress(hinstLib, "AddNumbers");  
    if (addNumbers == NULL) {  
        printf("ERROR: unable to find DLL function\n");  
        FreeLibrary(hinstLib);  
        system("pause");  
        return 1;  
    }  
 
    result = addNumbers(10, 20);  
    printf("The result is %f\n", result);  
 
    // Unload DLL file  
    FreeLibrary(hinstLib);  
    system("pause");  
    return 0;  
}




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※ 作者: KTR150Fi 時間: 2015-01-28 02:57:19