DllMain函数的运用

#include <stdio.h>
#include <windows.h>
#include <fstream>
#pragma comment(lib, "user32.lib")
using namespace std;
#pragma unmanaged




HHOOK g_hKey = NULL;
HINSTANCE h_HIN = NULL;

LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
	//if(nCode == HC_ACTION)
	//{
	//	return 1;
	//}
	return CallNextHookEx(g_hKey, nCode, wParam, lParam);
}


DWORD WINAPI MyFunc(LPVOID lpParameter)
{
	ofstream outfile("D:\\aaa.txt", ofstream::out | ofstream::app);
	outfile << "bbbbbbbbbbbbbbb\n" << endl;
	outfile.close();
	return TRUE;
}

void WINAPI InstallHook()
{
	DWORD g_dwThreadIdDIPS = GetCurrentThreadId();
	g_hKey = SetWindowsHookEx(WH_KEYBOARD, KeyboardProc, h_HIN, g_dwThreadIdDIPS);
}

void WINAPI UnstallHook()
{
	UnhookWindowsHookEx(g_hKey);
}

BOOL WINAPI DllMain(HINSTANCE hDllHandle, DWORD nReason, PVOID Reserved)
{
	HANDLE hThread = NULL;
	DWORD dwThreadID = NULL;
	switch (nReason)
	{
	case DLL_PROCESS_ATTACH:
		h_HIN = hDllHandle;
		InstallHook();
		break;
	case  DLL_PROCESS_DETACH:
		break;
	case DLL_THREAD_ATTACH:
		break;
	case DLL_THREAD_DETACH:
		break;
	default:
		break;
	}
	return TRUE;
}