键枚举，不返回所有标点符号的 ASCII 等效值

发布于 2024-12-06 17:29:35 字数 803 浏览 1 评论 0原文

我有以下按键处理程序：

void Form1::texBox_KeyDown(System::Object^  sender,
             System::Windows::Forms::KeyEventArgs^  e) {
    //New lines in response to suggestion of using keypress
    if (Control::ModifierKeys == Keys::Alt) return;
    e->SuppressKeyPress=true;
    unsigned char chr = (unsigned char)e->KeyCode;
    //char chr = (char)e->KeyCode; //Gives negative 'values'
    if (chr < ' ') return;
    //else do stuff
}

它可以适当地处理数字和字母，但是当我按下任何标点符号时，按键代码会完全进入思维状态。使用签名 char 我得到 -66 的 '.'和 190 与 unsigned char。

我认为这一定是由于我在 Windows 上搞乱了一些东西，请问有人可以提供更好的方法来处理表单标准文档容器之外的文本键盘吗？

按键听起来不错，但是它可以抑制输出吗？也许甚至是“Alt”检测（只是为了真正路由方便的 alt-F4 组合）？请参阅我在方法入口点添加的两行。 KeyPress 比让我的 dllimport 工作更容易，只需要处理箭头键和向上/向下翻页，也许我两者都需要......

原文

I have the following key handler:

void Form1::texBox_KeyDown(System::Object^  sender,
             System::Windows::Forms::KeyEventArgs^  e) {
    //New lines in response to suggestion of using keypress
    if (Control::ModifierKeys == Keys::Alt) return;
    e->SuppressKeyPress=true;
    unsigned char chr = (unsigned char)e->KeyCode;
    //char chr = (char)e->KeyCode; //Gives negative 'values'
    if (chr < ' ') return;
    //else do stuff
}

This handles numbers and letters appropriately, but when I press any punctuation the KeyCodes go completely mental. Using signed char I got -66 for '.' and 190 with unsigned char.

I assume this must be due to something I messed with with Windows, please would someone offer a better way to handle textual keyboard outside of a Forms' standard document containers?

Keypress sounds good, will it work to supress output though? Maybe even 'Alt' detection (just to route the handy alt-F4 combo really)? Please see the two lines I added at method's entry point. KeyPress is easier than getting my dllimport to work, just need to handle arrow keys and page up/down, perhaps I need both...

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