# DynamicLib

**Repository Path**: lvan100/DynamicLib

## Basic Information

- **Project Name**: DynamicLib
- **Description**: DynamicLib，极简的方式从dll或者so或者dylib文件获取导出（C）函数。
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 6
- **Forks**: 3
- **Created**: 2015-04-07
- **Last Updated**: 2020-12-18

## Categories & Tags

**Categories**: utils

**Tags**: None

## README

# DynamicLib
DynamicLib，极简的方式从dll或者so或者dylib文件获取导出（C）函数。下面展示的是一个简单的例子。

## 动态存储的方式导出User32.dll中的函数

    struct ShareUser32 {
        ShareUser32();
        DllFunc<HWND()> GetDesktopWindow;
        DllFunc<BOOL(HWND, LPRECT)> GetClientRect;
    };

    ShareUser32::ShareUser32()
        : GetClientRect("User32.dll", "GetClientRect", DllFuncType::DTF_STDCALL)
        , GetDesktopWindow("User32.dll", "GetDesktopWindow", DllFuncType::DTF_STDCALL)
    {}

## 静态存储方式导出User32.dll中的函数

    struct StaticUser32 {
        static DllFunc<HWND()> GetDesktopWindow;
        static DllFunc<BOOL(HWND, LPRECT)> GetClientRect;
    };

    DllFunc<HWND()> StaticUser32::GetDesktopWindow("User32.dll", "GetDesktopWindow", DllFuncType::DTF_STDCALL);
    DllFunc<BOOL(HWND, LPRECT)> StaticUser32::GetClientRect("User32.dll", "GetClientRect", DllFuncType::DTF_STDCALL);

## 使用动态存储方式可以很方便的在相同接口不同实现的dll文件间自由切换

    struct DllTest {
        DllFunc<int()> fnDllTest;
        DllTest() : fnDllTest("fnDllTest") {}
    };

## 调用示例

    int main(int argc, char* argv[]) {

    #ifdef WIN32

        RECT rcWnd;

        // 动态存储懒加载
        ShareUser32 mUser32;
        HWND hWnd = mUser32.GetDesktopWindow();
        mUser32.GetClientRect(hWnd, &rcWnd);

        // 静态存储懒加载
        hWnd = StaticUser32::GetDesktopWindow();
        StaticUser32::GetClientRect(hWnd, &rcWnd);

    #endif

        char buffer[256];
        _getcwd(buffer, sizeof(buffer));

        //////////////////////////////////////////////////////////////////////////

        DllTest DllTestInst;

        // 动态存储切换加载资源
    #ifdef WIN32
        DllTestInst.fnDllTest.Load("DllTestOne.dll");
    #else
        std::string OnePath(buffer);
    #ifdef __APPLE__
        OnePath.append("/DllTestOne.dylib");
    #else
        OnePath.append("/DllTestOne.so");
    #endif
        DllTestInst.fnDllTest.Load(OnePath.c_str());
    #endif
    
	DllTestInst.fnDllTest();
	DllTestInst.fnDllTest.Free();
    
        // 动态存储切换加载资源
    #ifdef WIN32
        DllTestInst.fnDllTest.Load("DllTestTwo.dll");
    #else
        std::string TwoPath(buffer);
    #ifdef __APPLE__
        TwoPath.append("/DllTestTwo.dylib");
    #else
        TwoPath.append("/DllTestTwo.so");
    #endif
        DllTestInst.fnDllTest.Load(TwoPath.c_str());
    #endif
        DllTestInst.fnDllTest();
        DllTestInst.fnDllTest.Free();

        return 0;
    }