C++动态加载DLL调用方法

一、构建DLL路径

  char szTmp[_MAX_PATH];    
char* szPath = getcwd(szTmp, _MAX_PATH);//获取当前工作目录
  //构建dll路径
 
 strcat(szTmp, DLLNAME);
 
 TCHAR wLocation[_MAX_PATH] = { 0 }; 
 
 MultiByteToWideChar(0, 0, szTmp, _MAX_PATH, wLocation, _MAX_PATH * 2);
 

二、加载DLL

//dll资源加载  
HINSTANCE hActive = LoadLibrary(wLocation);

三、调用DLL中函数

typedef void (_stdcall *pfnGetStatus)(long*); 

bool CLASSNAME::IsActive()
{    
long lStatus = 0;
    pfnGetStatus Func = (pfnGetStatus)GetProcAddress(hActive, "GetStatus");
    if(!Func)
    {    
        // Error;
    }
else
    {
        Func(&lStatus);
    }
return lStatus;
} 

四、释放DLL

    if(hActive != NULL)
    {
        FreeLibrary(hActive);
    }