建立一个简易登录界面

#include<windows.h>

LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    RECT rect;
    HFONT hfont, ohfont;
    static HWND hwndedit, hedit, hwndButton;

    switch(message)
    {
        case WM_CREATE:                                //应用程序建立一个窗口
                        hwndedit = CreateWindow( TEXT("edit"), NULL, WS_CHILD | WS_VISIBLE | WS_BORDER, 90, 60, 150, 30, hwnd, NULL, NULL, NULL);
                        hedit = CreateWindow( TEXT("edit"), NULL, WS_CHILD | WS_VISIBLE | WS_BORDER, 90, 100, 150, 30, hwnd, NULL, NULL, NULL);
                        hwndButton = CreateWindow( TEXT("button"), TEXT("安全登录"), WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON , 90, 200, 80, 28, hwnd, NULL, NULL, NULL);
            return 0;
        case WM_COMMAND:                            //处理点击按钮、菜单等控件时的触发消息
                        if( (HWND)lParam == hwndButton )
                        {
                            MessageBox( hwnd, TEXT("登录测试成功!"), TEXT("测试"), MB_ICONINFORMATION | MB_OK);
                        }
            return 0;
        case WM_PAINT:                                //重新自我绘制
                        hdc = BeginPaint (hwnd, &ps) ;
                        GetClientRect (hwnd, &rect) ;
                        hfont = CreateFont(30, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "微软雅黑");
                        ohfont=SelectObject(hdc,hfont);
                        TextOut(hdc, 20, 60, "账户:", 5);
                        TextOut(hdc, 20, 100, "密码:", 5);
                        EndPaint(hwnd, &ps);
            return 0;
        case WM_DESTROY:                            //当窗口关闭时产生的原因
                        PostQuitMessage(0);            //产生WM_QUIT消息
            return 0;
        case WM_CLOSE:
                        DestroyWindow(hwnd);
            return 0;
    }
    return DefWindowProc(hwnd,message,wParam,lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    static TCHAR szAppName[]    =    TEXT ("DARKCHII");
    HWND hwnd;
    HBRUSH hbrh;
    MSG msg;
    WNDCLASS wndclass;
    hbrh=CreateSolidBrush(RGB(255,255,255));

    wndclass.cbClsExtra            =    0;
    wndclass.cbWndExtra            =    0;
    wndclass.hbrBackground        =    hbrh;
    wndclass.hCursor            =    LoadCursor(NULL, IDC_ARROW);
    wndclass.hIcon                =    LoadIcon(NULL, IDI_APPLICATION);
    wndclass.hInstance            =    hInstance;
    wndclass.lpfnWndProc        =    WndProc;
    wndclass.lpszClassName        =    szAppName;
    wndclass.lpszMenuName        =    NULL;
    wndclass.style                =    CS_HREDRAW|CS_VREDRAW;

    if(!RegisterClass (&wndclass))
    {
        MessageBox(NULL,TEXT("注册窗口失败!"),szAppName,MB_ICONERROR);
        return 0;
    }

    hwnd = CreateWindow(szAppName,
            "DarkChii",
            WS_OVERLAPPEDWINDOW,
            640,                    //窗口的初始位置左边距
            180,                    //窗口的初始位置顶边距
            280,
            380,
            NULL,
            NULL,
            hInstance,
            NULL);

    ShowWindow(hwnd,nCmdShow);
    UpdateWindow(hwnd);

    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}

运行效果：