BUG: Winsock Control Might Not Receive Binary Data

• Microsoft Windows CE Toolkit for Visual Basic 6.0, version 1.0

SYMPTOMS

When you use the Winsock control to try to receive binary data (that is, a bitmap, and so forth), you might only receive a subset of your data. In the DataArrival event, you can verify that the correct number of bytes is received, but you cannot get all of the data using the GetData method.

The documentation for the GetData method of the Windows CE Winsock Control incorrectly states:

GetData supports only strings and arrays of integers. It is common to use the GetData method with the DataArrival event.

CAUSE

The CE Winsock control only retrieves data to the first ASCII 0 it receives, and then it stops.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

Steps to Reproduce Behavior

1. Create a new Windows CE H/PC or H/PC Pro project in Visual Basic. Form1 will be created by default. The application runs in emulation by default.



2. Select Components from the Project menu and add the Microsoft CE Winsock Control to the project.



3. Add a command button to Form1.



4. Copy a bitmap or other binary file to the root of your Web server's content directory.



5. Paste the following code into Form1:




Private Sub Form_Load
    'Note: replace with your Web server's IP address
    Winsock1.RemoteHost = "127.0.0.1" 
    Winsock1.Protocol = sckTCPProtocol
    Winsock1.RemotePort = 80
    Winsock1.Connect   
End Sub

Private Sub WinSock1_DataArrival(ByVal bytesTotal As Long)
    Dim strData   
    Winsock1.GetData strData
    MsgBox "Bytes Total is " & bytesTotal & " data is " & strData
End Sub

Private Sub Command1_Click()
  'You can replace lanmannt.bmp with the name of the file
  'you put in your Web server's content directory
  Winsock1.SendData "GET /lanmannt.bmp" & vbCrLf & vbCrLf
End Sub 

6. Run the application and click the command button.


Note that you receive only a portion of the data from the bitmap, and you are not able to receive any more data until the program is reset.

Additional query words: vbce vbce6 wince wce

Keywords : kbToolkit kbVBp600bug kbWinCE kbGrpVB
Version : WINDOWS:1.0
Platform : WINDOWS
Issue type : kbbug