微软.net精简框架常见问题及回答(中文版)(63)

王朝c#·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) _

Handles MyBase.Load

Dim r As DialogResult = MessageBox.Show( _

"Are you sure you want to reset?", _

"Test", _

MessageBoxButtons.YesNo, _

MessageBoxIcon.Question, _

MessageBoxDefaultButton.Button2)

If r = DialogResult.Yes Then

ResetPocketPC()

End If

End Sub 'Form1_Load

6.18. How can I put an icon on the title bar regardless of the which form is active?

This is not supported with the current version of the .NET Compact Framework. You can, however, P/Invoke Pocket PC's notificaiton system to do this. Refer to the following for more information:

Sample Code:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnppc2k2/html/ppc_fications.asp

AYGShell APIs:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wceui40/html/_cerefaygshellfunctions.asp

The native Notification APIs are: SHNotificationAdd, SHNotificationRemove, SHNotificationGetData, and SHNotificationUpdate.

6.19. How do I disable and capture hardware buttons?

Refer to the sample in the P/Invoke library.

http://msdn.microsoft.com/library/en-us/dnnetcomp/html/PInvokeLib.asp#PInvokeLib_Topic03

6.20. How do I hide the start icon?

The Start icon can be hidden using the SHFullScreen API. //C#

const uint SHFS_SHOWTASKBAR = 0x0001;

const uint SHFS_HIDETASKBAR = 0x0002;

const uint SHFS_SHOWSIPBUTTON = 0x0004;

const uint SHFS_HIDESIPBUTTON = 0x0008;

const uint SHFS_SHOWSTARTICON = 0x0010;

const uint SHFS_HIDESTARTICON = 0x0020;

[DllImport("aygshell.dll")]

static extern uint SHFullScreen(IntPtr hwndRequester, uint dwState);

[DllImport("coredll.dll")]

public static extern IntPtr GetCapture();

private void Form1_Load(object sender, System.EventArgs e)

{

Capture = true;

IntPtr hwnd = GetCapture();

Capture = false;

SHFullScreen(hwnd, SHFS_HIDESTARTICON);

}

'VB

Const SHFS_SHOWTASKBAR As Integer = &H1

Const SHFS_HIDETASKBAR As Integer = &H2

Const SHFS_SHOWSIPBUTTON As Integer = &H4

Const SHFS_HIDESIPBUTTON As Integer = &H8

Const SHFS_SHOWSTARTICON As Integer = &H10

Const SHFS_HIDESTARTICON As Integer = &H20

<DllImport("aygshell.dll")> _

Shared Function SHFullScreen(ByVal hwndRequester As IntPtr, ByVal dwState As Integer) As Integer

End Function

<DllImport("coredll.dll")> _

Public Shared Function GetCapture() As IntPtr

End Function

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs)

Capture = True

Dim hwnd As IntPtr = GetCapture()

Capture = False

SHFullScreen(hwnd, SHFS_HIDESTARTICON)

End Sub 'Form1_Load

6.21. How do I enumerate, create, and terminate processes?

Refer to the sample:

http://msdn.microsoft.com/mobility/understanding/articles/default.aspx?pull=/library/en-us/dnnetcomp/html/processmanager.asp

6.22. Where can I find a centralized library of P/Invoke samples?

This sample demonstrates how to P/Invoke numerous useful native functions that are not directly available through the .NET Compact Framework. A test Form is provided that enumerates all available test procedures and allows the user to select and run them:

http://msdn.microsoft.com/library/en-us/dnnetcomp/html/PInvokeLib.asp

6.23. How do I play and record .WAV audio files with the Waveform Audio Inteface?

Learn how to use the Waveform Audio Interface to record and play ".wav" files:

http://msdn.microsoft.com/library/en-us/dnnetcomp/html/WaveInOut.asp

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