无法调用dll文件中的线程 [英] unable to call a thread in dll file

问题描述

我正在尝试创建一个dll，该DLL将在您加载他时创建一个线程 由于某种原因，线程函数没有执行任何操作..:\

I am trying to create a dll which will create a thread when you load him for some reason the thread function is not doing anything.. :\

这是我的代码:

dllthread！= null ..为什么不起作用?

dllthread != null.. why its not working?

#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;
}

推荐答案

不是从DllMain()启动线程，而是导出将启动线程的函数:

Instead of starting the thread from DllMain() export a function that would launch the thread instead:

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()后，使用GetProcAddress()可以访问start_thread()函数.

After calling LoadLibrary() use GetProcAddress() to get access to the start_thread() function.

希望这会有所帮助.

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