vc调用dll正常情况下，都是要有h/lib/dll三个档案，但有时并没有lib档，只有dll档和h档，比如用bcb生成的dll，vc不没变法直接用lib档。这时候用动态调用将会更方法。
下面详细讲下如何实现dll动态调用。
bcb先制作测试dll，有4个函数，加、减、乘、除。具体代码如下：
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//--------------------------------------------------------------------------- #ifndef TestH #define TestH //--------------------------------------------------------------------------- #define __TEST_EXPORTS #ifdef __TEST_EXPORTS #define GV_API __declspec(dllexport) #else #define GV_API __declspec(dllimport) #endif //--------------------------------------------------------------------------- #ifdef __cplusplus extern "C" { #endif //--------------------------------------------------------------------------- GV_API float _stdcall Add(float a, float b); GV_API float _stdcall Sub(float a, float b); GV_API float _stdcall Mul(float a, float b); GV_API float _stdcall Div(float a, float b); //--------------------------------------------------------------------------- #ifdef __cplusplus } #endif //--------------------------------------------------------------------------- #endif |
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//--------------------------------------------------------------------------- #pragma hdrstop #include "Test.h" //--------------------------------------------------------------------------- #pragma package(smart_init) //--------------------------------------------------------------------------- GV_API float _stdcall Add(float a, float b) { return a+b; } //--------------------------------------------------------------------------- GV_API float _stdcall Sub(float a, float b) { return a-b; } //--------------------------------------------------------------------------- GV_API float _stdcall Mul(float a, float b) { return a*b; } //--------------------------------------------------------------------------- GV_API float _stdcall Div(float a, float b) { return a/b; } //--------------------------------------------------------------------------- |
编译后有生成Test.dll档，下面将用vc动态直接调用。主要用到函数LoadLibrary加载dll? GetProcAddress获取函数入口地址
具体代码如下：
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// ConsoleApplication1.cpp : 定义控制台应用程序的入口点。 // #include "stdafx.h" #include <iostream> #include <Windows.h> typedef float(__stdcall *Fun_fff)(float, float); Fun_fff Add; Fun_fff Sub; Fun_fff Mul; Fun_fff Div; int main() { HINSTANCE Hdl = LoadLibrary("Test.dll"); if (Hdl) { Add = (Fun_fff)GetProcAddress(Hdl, "Add"); Sub = (Fun_fff)GetProcAddress(Hdl, "Sub"); Mul = (Fun_fff)GetProcAddress(Hdl, "Mul"); Div = (Fun_fff)GetProcAddress(Hdl, "Div"); } std::cout <<"相加："<< Add(2, 3) <<"\n" << "相减：" << Sub(2, 3) << "\n" << "相乘：" << Mul(2, 3) << "\n" << "相除：" << Div(2, 3) << std::endl; system("pause"); return 0; } |
运行结果：
关于dll反编译：
