c++中多线程的简单使用

#include "stdafx.h"
#include <windows.h>
#include <windowsx.h>
#include "resource.h"
#include "MainDlg.h"
BOOL isCancel=FALSE;
HWND hwnd1;
BOOL WINAPI Main_Proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
        HANDLE_MSG(hWnd, WM_INITDIALOG, Main_OnInitDialog);
        HANDLE_MSG(hWnd, WM_COMMAND, Main_OnCommand);
		HANDLE_MSG(hWnd,WM_CLOSE, Main_OnClose);
    }

    return FALSE;
}

BOOL Main_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam)
{
	hwnd1=hwnd;
    return TRUE;
}
DWORD WINAPI ThreadFun(LPVOID Lpparam)//要运行的耗时操作，如果要用 Lpparam 需要显式转换
{

	SetDlgItemText(hwnd1,IDC_EDIT1,"正在连接服务器…");
	Sleep(4000);
	if(isCancel==TRUE)
	{
		SetDlgItemText(hwnd1,IDC_EDIT1,"登陆已取消!");
		return -1;
	}

	SetDlgItemText(hwnd1,IDC_EDIT1,"正在验证密码…");
	Sleep(4000);
	if(isCancel==TRUE)
	{
		SetDlgItemText(hwnd1,IDC_EDIT1,"登陆已取消!");
		return -1;
	}
	SetDlgItemText(hwnd1,IDC_EDIT1,"验证通过!");
	return 0;
}
void Main_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify)
{
    switch(id)
    {
        case IDC_OK:
		{
			isCancel=FALSE;
			CreateThread(NULL,0,ThreadFun,0,0,0);//新的线程运行函数，第4个参数可以给函数传参数值
		}
        break;
		case IDC_btnCancel:
			{
				isCancel=TRUE;
			}
			break;;
        default:
		break;
    }
}

void Main_OnClose(HWND hwnd)
{
    EndDialog(hwnd, 0);
}