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Asked:2022-01-03 17:00:50 +0000 UTC2022-01-03 17:00:50 +0000 UTC

无法通过编辑字段实现完整的数据输入[关闭]

  • 772

需要通过 EDIT 字段进行数据输入。我自己实现了输入字段，它仍然以某种方式保存在此字段中键入的文本。我已经“打破”了我的头，它不起作用！

我试图将文本保存到一个数组中，然后通过MessageBox. 将显示一个空窗口。

这是徒劳的尝试：

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
    HWND hed;
    int len;
    TCHAR* buff;
    RECT screen_rect;
    GetWindowRect(GetDesktopWindow(), &screen_rect); // разрешение экрана
    int x1 = screen_rect.right / 2 - 300;
    int y1 = screen_rect.bottom / 2 - 75;
    switch (message)
    {
    case WM_CREATE:
        hed = CreateWindow(TEXT("edit"), TEXT(""),
        WS_CHILD | WS_VISIBLE | WS_BORDER | ES_RIGHT, 50, 50, 500, 20,
        hWnd, NULL, NULL, NULL);
        len = GetWindowTextLength(hed) + 1;
        buff = new TCHAR[len];
        len = GetWindowText(hed, buff, len);
        buff[len] = 0;
        MessageBox(hWnd, buff, TEXT("text"), MB_OKCANCEL | MB_ICONEXCLAMATION);
        delete[] buff;
        break;
case WM_DESTROY:
    PostQuitMessage(0);
    break;
default:
    return DefWindowProc(hWnd, message, wParam, lParam);
    break;
}
c++

1 个回答

  1. Best Answer

    创建后立即显示一个带有文本的对话框EDIT。

    您遇到的另一个小问题是，当您编写 line 时buff[len] = 0，您超出了数组的限制。需要写buff[len - 1] = 0

    我还要马上说，如果你在函数中WndProc留下一个变量hed，那么你需要把它变成静态的。

    可以通过多种方式保存文本。例如：

    1. 在静态窗口中显示文本STATIC

      我们将STATIC在更改文本时设置文本EDIT，为此我们需要捕获相应的消息WM_COMMAND

      例如像这样：

       if (HIWORD(wParam) == EN_CHANGE && LOWORD(wParam) == EDIT_ID) {
     len = GetWindowTextLength(hed) + 1;
     buff = new TCHAR[len];
     GetWindowText(hed, buff, len);
     buff[len - 1] = 0;
     SetWindowText(hStatic, buff);
     delete[] buff;
 }

    2. 并且MessageBox您可以在单击按钮时显示，为此您还需要捕获按钮单击事件。

      例如像这样：

       else if (LOWORD(wParam) == BUTTON_ID) {
     len = GetWindowTextLength(hed) + 1;
     buff = new TCHAR[len];
     GetWindowText(hed, buff, len);
     buff[len - 1] = 0;
     MessageBox(hWnd, buff, TEXT("text"), MB_OKCANCEL | MB_ICONEXCLAMATION);
     delete[] buff;
 }

    这是整个函数的示例WndProc：

    #define EDIT_ID 1001
#define BUTTON_ID 1002
#define STATIC_ID 1003

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
    static HWND hed;
    static HWND hBtn;
    static HWND hStatic;
    int len;
    TCHAR* buff;
    RECT screen_rect;
    GetWindowRect(GetDesktopWindow(), &screen_rect); // разрешение экрана
    int x1 = screen_rect.right / 2 - 300;
    int y1 = screen_rect.bottom / 2 - 75;
    switch (message)
    {
    case WM_CREATE:
        hed = CreateWindow(TEXT("edit"), TEXT(""),
            WS_CHILD | WS_VISIBLE | WS_BORDER | ES_RIGHT, 0, 50, 80, 20,
            hWnd, (HMENU)EDIT_ID, NULL, NULL);
        hBtn = CreateWindow(TEXT("Button"), TEXT("Click"), WS_CHILD | WS_VISIBLE | WS_BORDER,
            0, 0, 80, 20, hWnd, (HMENU)BUTTON_ID, NULL, NULL);
        hStatic = CreateWindow(TEXT("STATIC"), TEXT(""), 
            WS_CHILD | WS_VISIBLE | ES_RIGHT, 0, 25, 80, 20,
            hWnd, (HMENU)STATIC_ID, NULL, NULL);
        break;
    case WM_COMMAND: {
        if (HIWORD(wParam) == EN_CHANGE && LOWORD(wParam) == EDIT_ID) {
            len = GetWindowTextLength(hed) + 1;
            buff = new TCHAR[len];
            GetWindowText(hed, buff, len);
            buff[len - 1] = 0;
            SetWindowText(hStatic, buff);
            delete[] buff;
        }
        else if (LOWORD(wParam) == BUTTON_ID) {
            len = GetWindowTextLength(hed) + 1;
            buff = new TCHAR[len];
            GetWindowText(hed, buff, len);
            buff[len - 1] = 0;
            MessageBox(hWnd, buff, TEXT("text"), MB_OKCANCEL | MB_ICONEXCLAMATION);
            delete[] buff;
        }
        break;
    }
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
        break;
    }

    结果，我们有BUTTON和。当我们在 中写入内容时，会在 中显示相同的文本。当您单击按钮时，来自.EDITSTATICEDITSTATICEDIT

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