1. Herfried K. Wagner’s VB.Any
  2. .NET
  3. Häufig gestellte Fragen

Aktivieren eines ComboBox-Steuerelements zur Kennworteingabe

Aktivieren eines ComboBox-Steuerelements zur Kennworteingabe
<URL:https://dotnet.currifex.org/dotnet/faqs/comboboxpasswordchar/de/>
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Enabling a password char for a combobox control

Comboboxes with 'DropDownStyle' set to 'DropDown' do not support a password
char for the edit part in Windows Forms of .NET 1.1.
'SetComboBoxPasswordChar' provides a method to set a combobox's password
char.

\\\
Private Declare Auto Function GetWindow Lib "user32.dll" ( _
    ByVal hWnd As IntPtr, _
    ByVal wCmd As Int32 _
) As IntPtr

Private Declare Auto Function SendMessage Lib "user32.dll" ( _
    ByVal hWnd As IntPtr, _
    ByVal wMsg As Int32, _
    ByVal wParam As IntPtr, _
    ByVal lParam As IntPtr _
) As IntPtr

Private Const EM_SETPASSWORDCHAR As Int32 = &HCC

Private Const GW_CHILD As Int32 = 5

Private Sub SetComboBoxPasswordChar( _
    ByVal ComboBox As ComboBox, _
    ByVal PasswordChar As Char _
)
    SendMessage( _
        GetWindow( _
            ComboBox.Handle, _
            GW_CHILD _
        ), _
        EM_SETPASSWORDCHAR, _
        New IntPtr(AscW(PasswordChar)), _
        IntPtr.Zero _
    )
    ComboBox.Refresh()
End Sub
///

Usage:

\\\
SetComboBoxPasswordChar(Me.ComboBox1, "*"c)
///