.net 将键码转换为键字符
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Convert keycode to key char
提问by
How do I convert a keycode to a keychar in .NET?
如何在 .NET 中将键码转换为键字符？
回答by Ady
In VB.NET:
在 VB.NET 中：
ChrW(70)
In C# you can cast:
在 C# 中，您可以转换：
(char) 70
回答by Pablo Rausch
I solved this using a library class from user32.dll. I would prefer a Framework class, but couldn't find one so this worked for me.
我使用 user32.dll 中的库类解决了这个问题。我更喜欢一个框架类，但找不到一个所以这对我有用。
Imports System.Runtime.InteropServices
Public Class KeyCodeToAscii
<DllImport("User32.dll")> _
Public Shared Function ToAscii(ByVal uVirtKey As Integer, _
ByVal uScanCode As Integer, _
ByVal lpbKeyState As Byte(), _
ByVal lpChar As Byte(), _
ByVal uFlags As Integer) _
As Integer
End Function
<DllImport("User32.dll")> _
Public Shared Function GetKeyboardState(ByVal pbKeyState As Byte()) _
As Integer
End Function
Public Shared Function GetAsciiCharacter(ByVal uVirtKey As Integer) _
As Char
Dim lpKeyState As Byte() = New Byte(255) {}
GetKeyboardState(lpKeyState)
Dim lpChar As Byte() = New Byte(1) {}
If ToAscii(uVirtKey, 0, lpKeyState, lpChar, 0) = 1 Then
Return Convert.ToChar((lpChar(0)))
Else
Return New Char()
End If
End Function
End Class
回答by Hasitha D
Try this:
尝试这个：
Char.ConvertFromUtf32(e.KeyValue)
回答by MRb
I found this snippet to be rather helpful in detecting a keypress from the enter key:
我发现这个片段对于从 Enter 键检测按键非常有帮助：
Private Sub StartValue_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles StartValue.KeyPress
If ChrW(13).ToString = e.KeyChar And StartValue.Text = "" Then
StartValue.Text = "0"
End If
End Sub
I found this to be a decent solution to having people trying to submit a null value in a textbox. This just forces a 0, but it uses the "detect enter being pressed" to run.
我发现这是让人们尝试在文本框中提交空值的一个不错的解决方案。这只是强制为 0，但它使用“检测输入被按下”来运行。
回答by DaveH
Convert.ToChar(Keys.Enter);
Convert.ToChar(Keys.Enter);
回答by Yiu Korochko
I can't seem to reply to DaveH, but if you do as he says, it works fine!
我似乎无法回复 DaveH，但如果你按照他说的去做，那就没问题了！
Private Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As Long) As Integer
Public sub harry()
For i = 1 to 255
If Chr(i) = Convert.ToChar(Keys.Enter) Then
Label1.Text &= " [Enter] "
ElseIf Chr(i) = Convert.ToChar(Keys.Delete) Then
Label1.Text &= " [Delete] "
End If
Next i
End Sub
回答by Nooa
Here an example from my side :)
这是我身边的一个例子:)
#region Just for fun :D
private string _lastKeys = "";
private readonly Dictionary<string, string[]> _keyChecker = _
new Dictionary<string, string[]>
{
// Key code to press, msgbox header, msgbox text
{"iddqd", new[] {"Cheater! :-)", "Godmode activated!"}},
{"idkfa", new[] {"Cheater! :-)", "All Weapons unlocked!"}},
{"aAa", new[] {"Testing", "Test!"}},
{"aaa", new[] {"function", "close"}}
};
private void KeyChecker(KeyPressEventArgs e)
{
_lastKeys += e.KeyChar;
foreach (var key in _keyChecker.Keys)
if (_lastKeys.EndsWith(key))
if (_keyChecker[key][0] != "function")
MessageBox.Show(_keyChecker[key][1], _keyChecker[key][0]);
else
KeyCheckerFunction(_keyChecker[key][1]);
while (_lastKeys.Length > 100)
_lastKeys = _lastKeys.Substring(1);
}
private void KeyCheckerFunction(string func)
{
switch (func)
{
case "close":
Close();
break;
}
}
private void FormMain_KeyPress(object sender, KeyPressEventArgs e)
{
KeyChecker(e);
}
#endregion Just for fun :D
回答by Nooa
String.fromCharCode(event.keyCode)
String.fromCharCode(event.keyCode)
