c - 为什么这个 C 程序会无限循环？

Question

我写了一个 DLL 文件，我可以将它注入到另一个进程中。一旦注入，它应该创建一个消息框。它似乎创建了无限数量的消息框并且我的计算机崩溃了。有任何想法吗？另外，DLLIMPORT 和 DWORD WINAPI 有什么区别？Main 应该是 DLLIMPORT 还是其他？

dllmain.c

/* Replace "dll.h" with the name of your header */
#include "dll.h"
#include <windows.h>

DLLIMPORT void HelloWorld() {
    MessageBox(0,"Hello World from DLL!\n","Hi",MB_ICONINFORMATION);
}

int main() {
    MessageBox(0,"Hello World from DLL!\n","Hi",MB_ICONINFORMATION);
}

DWORD WINAPI Main(LPVOID lpParam) {
    main();
    return S_OK;
}

BOOL WINAPI DllMain(
    HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) {
    switch(fdwReason) {
        case DLL_PROCESS_ATTACH:
        break;

        case DLL_PROCESS_DETACH:
        break;

        case DLL_THREAD_ATTACH:
        DisableThreadLibraryCalls(hinstDLL);
        CreateThread(NULL, 0, &Main, NULL, 0, NULL);
        break;

        case DLL_THREAD_DETACH:
        break;
    }

    return TRUE;
}

dll.h

#ifndef _DLL_H_
#define _DLL_H_

#if BUILDING_DLL
#define DLLIMPORT __declspec(dllexport)
#else
#define DLLIMPORT __declspec(dllimport)
#endif

DLLIMPORT void HelloWorld();

#endif

Answer 1

当 DLL 附加到进程而不是线程时执行线程：

...
        case DLL_PROCESS_ATTACH:
        DisableThreadLibraryCalls(hinstDLL);
        CreateThread(NULL, 0, Main, NULL, 0, NULL);
        break;

        case DLL_PROCESS_DETACH:
        break;

        case DLL_THREAD_ATTACH:
        break;

        case DLL_THREAD_DETACH:
        break;
...

并检查您传递给的回调CreateThread，它应该Main不是&Main，它已经是指针。