获取编辑框控件文本

之前我们介绍了 getWindowText 函数，它可以用来获取控件的文本。

下面的例子演示用户点击登录按钮时，如何获取用户的输入内容：

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;
    static HFONT hFont;  //逻辑字体
    static HWND hLabUsername;  //静态文本框--用户名
    static HWND hLabPassword;  //静态文本框--密码
    static HWND hEditUsername;  //单行文本输入框
    static HWND hEditPassword;  //密码输入框
    static HWND hBtnLogin;  //登录按钮
    //定义缓冲区
    TCHAR szUsername[100];
    TCHAR szPassword[100];
    TCHAR szUserInfo[200];
    switch (message){
        case  WM_CREATE:
            //创建逻辑字体
            hFont = CreateFont(-14/*高*/, -7/*宽*/, 0, 0, 400 /*一般这个值设为400*/,
                FALSE/*斜体?*/, FALSE/*下划线?*/, FALSE/*删除线?*/,DEFAULT_CHARSET,
                OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS, DEFAULT_QUALITY,
                FF_DONTCARE, TEXT("微软雅黑")
            );
            //创建静态文本框控件--用户名
            hLabUsername = CreateWindow(TEXT("static"), TEXT("用户名："),
                WS_CHILD | WS_VISIBLE | SS_CENTERIMAGE /*垂直居中*/ | SS_RIGHT /*水平居右*/,
                0 /*x坐标*/, 20 /*y坐标*/, 70 /*宽度*/, 26 /*高度*/,
                hWnd /*父窗口句柄*/, (HMENU)1 /*控件ID*/, hInst /*当前程序实例句柄*/, NULL
            );
            //创建静态文本框控件--密码
            hLabPassword = CreateWindow(TEXT("static"), TEXT("密码："),
                WS_CHILD | WS_VISIBLE | SS_CENTERIMAGE /*垂直居中*/ | SS_RIGHT /*水平居右*/,
                0, 56, 70, 26,
                hWnd, (HMENU)2, hInst, NULL
            );
            //创建单行文本框控件
            hEditUsername = CreateWindow(TEXT("edit"), TEXT(""),
                WS_CHILD | WS_VISIBLE | WS_BORDER /*边框*/ | ES_AUTOHSCROLL /*水平滚动*/,
                80, 20, 200, 26,
                hWnd, (HMENU)3, hInst, NULL
            );
            //创建密码输入框
            hEditPassword = CreateWindow(TEXT("edit"), TEXT(""),
                WS_CHILD | WS_VISIBLE | WS_BORDER | ES_PASSWORD /*密码*/ | ES_AUTOHSCROLL /*水平滚动*/,
                80, 56, 200, 26,
                hWnd, (HMENU)4, hInst, NULL
            );
            //创建按钮控件
            hBtnLogin = CreateWindow(TEXT("button"), TEXT("登录"),
                WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/,
                80, 92, 200, 30,
                hWnd, (HMENU)5, hInst, NULL
            );
            //依次设置控件的字体
            SendMessage(hLabUsername, WM_SETFONT, (WPARAM)hFont, NULL);
            SendMessage(hLabPassword, WM_SETFONT, (WPARAM)hFont, NULL);
            SendMessage(hEditUsername, WM_SETFONT, (WPARAM)hFont, NULL);
            SendMessage(hEditPassword, WM_SETFONT, (WPARAM)hFont, NULL);
            SendMessage(hBtnLogin, WM_SETFONT, (WPARAM)hFont, NULL);
            break;
         case WM_COMMAND:
            wmId    = LOWORD(wParam);
            wmEvent = HIWORD(wParam);
            switch (wmId){
                case 5:  //按钮的HMENU参数
                    //获取输入框的数据
                    GetWindowText(hEditUsername, szUsername, 100);
                    GetWindowText(hEditPassword, szPassword, 100);
                    wsprintf(szUserInfo, TEXT("泛容提示：\r\n您的用户账号：%s\r\n您的用户密码：%s"), szUsername, szPassword);
                    MessageBox(hWnd, szUserInfo, TEXT("信息提示"), MB_ICONINFORMATION);
                    break;
                default:
                    return DefWindowProc(hWnd, message, wParam, lParam);
            }
            break;
        case WM_PAINT:
            hdc = BeginPaint(hWnd, &ps);
            // TODO:  在此添加任意绘图代码...
            EndPaint(hWnd, &ps);
            break;
        case WM_DESTROY:
            DeleteObject(hFont);
            PostQuitMessage(0);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

程序运行后会出现一个窗口（与上面相同），输入用户名和密码，点击“登录”按钮，弹出提示框，如下图所示：