C ++ DLL函数导出。 DLL不会保持加载状态

#include <Windows.h>
#include <tchar.h>

__declspec(dllexport) LRESULT CALLBACK HookProc(int nCode, WPARAM wParam, LPARAM lParam) {
    return CallNextHookEx(NULL, nCode, wParam, lParam);
    }

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserverd){

// Perform actions based on the reason for calling.
switch( fdwReason ) 
{ 
    case DLL_PROCESS_ATTACH:
     // Initialize once for each new process.
     // Return FALSE to fail DLL load.
        MessageBox(NULL,
        _T(\"DLL Loaded\"),
        _T(\"DLL Loaded\"),
        NULL);
        break;

    case DLL_THREAD_ATTACH:
     // Do thread-specific initialization.
        MessageBox(NULL,
        _T(\"DLL Unloaded\"),
        _T(\"DLL Unloaded\"),
        NULL);
        break;
    }
    return TRUE;
}

#include <Windows.h>
#include <tchar.h>

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow){

    FARPROC pHookProc;
    static HINSTANCE hInstDLL;

    hInstDLL = LoadLibrary(_T(\"mylib.dll\"));
    pHookProc = GetProcAddress(hInstDLL, \"HookProc\");
    if (!pHookProc) {
        MessageBox(NULL,
            _T(\"GetProcAddress failed\"),
            _T(\"GetProcAddress failed\"),
            NULL);
    }
    return 0;
}