通过代码注册COM、DLL组件

　　注册代码如下：

 C++ Code 

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//
//=================================================//
//If returns    Zero, DLL successfully registered...
//        -2 means DLL can not be loaded..
//        -3 means DLL Entry point can not be found..
//        -4 means Could not register the file...
//                 DLL Registration failed..
//================================================//
int RegisterComponent(char *absPath)
{
    HINSTANCE hDLL = LoadLibrary(absPath);
    if(hDLL == NULL)
    {
        //-2 means DLL can not be loaded..
        return -2;
    }

    typedef HRESULT (CALLBACK *HCRET)(void);
    HCRET lpfnDllRegisterServer;
    lpfnDllRegisterServer =
         (HCRET)GetProcAddress(hDLL, "DllRegisterServer");

    if(lpfnDllRegisterServer == NULL)
    {
        //-3 means DLL Entry point can not be found..
        return -3;
    }

    //Call the function by function pointer..
    if(FAILED((*lpfnDllRegisterServer)()))
    {
        //-4 means Could not register the file...
        //DLL Registration failed..
        return -4;
    }
    return 0;
}
//

　　测试代码：

 C++ Code 

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//
int nVal = RegisterComponent("C:\KvDateTime.OCX");
if(nVal == 0)
{
    AfxMessageBox("Component Successfully Registered...");
}
else if(nVal == -2)
{
    AfxMessageBox("DLL can not be loaded.. Reason could "
       "be path is incorrect or.. Component is corrupt");
}
else if(nVal == -3)
{
    AfxMessageBox("DLL Entrypoint for function "
                 "DLLRegisterServer could not be found..");
}
else if(nVal == -4)
{
    AfxMessageBox("DLL Registration Failed..");
}
else
{
    AfxMessageBox("Unknown error in registering the file..");
}
//