无法在dll文件中调用线程

Question

我正在尝试创建一个dll,当你加载他因为某些原因线程函数没有做任何事情时会创建一个线程..:\

这是我的代码:

dllthread!= null ..为什么不工作？

#include "stdafx.h"
DWORD WINAPI ThreadProc(
  __in  LPVOID lpParameter
)
{

    std::ofstream myfile;
    myfile.open ("example.txt");
    myfile << "Writing this to a file.\n";
    myfile.close();

    return 0;
}

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{

    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:    
        DWORD DllThreadID;
        HANDLE DllThread; //thread's handle

        DllThread=CreateThread(NULL,0,&ThreadProc,0,0,&DllThreadID);
// 
        if (DllThread == NULL)
            MessageBox(NULL, L"Error", L"Error", MB_OK);

        CloseHandle(DllThread);
        break;
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:


        break;
    }
    return TRUE;
}

Answer 1

而不是从DllMain()导出启动线程而不是启动线程的函数:

extern "C" __declspec(dllexport) void start_thread()
{
    DWORD DllThreadID;
    HANDLE DllThread; //thread's handle

    DllThread=CreateThread(NULL,0,ThreadProc,0,0,&DllThreadID);
    if (DllThread == NULL)
        MessageBox(NULL, L"Error", L"Error", MB_OK);
    else
        CloseHandle(DllThread);

}

调用LoadLibrary()use GetProcAddress()后可以访问该start_thread()函数.

希望这可以帮助.