DllMain入口点DLL_PROCESS_DETACH

Question

我有一个c ++ dll，从c＃进程调用...

[DllImport(@"My.dll", EntryPoint = "Function1", CallingConvention = CallingConvention.Cdecl)]
        public static extern bool MyFunction(int id1, int id2, [MarshalAsAttribute(UnmanagedType.LPWStr)] StringBuilder Name);

这是dll入口点......

switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        std::cout << "Attach" << std::endl;
        break;
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        std::cout << "Detach" << std::endl;
        break;
    }

我得到一个附件和四个分离像这样...

附加 分离 分离 分离 分离

任何人都可以解释原因吗？

该过程仅对该函数进行一次调用。

Answer 1

case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
    std::cout << "Detach" << std::endl;
    break;

当DLL_THREAD_ATTACH，DLL_THREAD_DETACH或DLL_PROCESS_DETACH被触发时，您的代码将在控制台中写入“分离”。如果您只想在DLL_PROCESS_DETACH中添加break个switch语句：

switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
    std::cout << "Attach" << std::endl;
    break;
case DLL_THREAD_ATTACH:
    break;
case DLL_THREAD_DETACH:
    break;
case DLL_PROCESS_DETACH:
    std::cout << "Detach" << std::endl;
    break;
}

或者只是省略未使用的案例。