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| Author | Forum: PowerTCP Web for ActiveX Topic: Multiple instances, non-blocking |
| User69 Posts: 3 Member Since: 04/30/02 |
posted April 30, 2002 10:32 AM The reason for doing trial of DART is that MITC does not support a single instance each running in a separate process, simultaneously executing. I need to have maybe 1 to 20 running all at the same time in separate programs. This approach can be shown to fail in MITC, but also gives an error message in the Web Tool: Private Sub Command1_Click() Dim strURL As String Dim lngTimeout As Long Dim Content1 As String, Content2 As String, Content3 As String Dim Headers1 As DartSock.DartStrings, Headers2 As DartSock.DartStrings, Headers3 As DartSock.DartStrings strURL = "http://www.google.com/" lngTimeout = 0 Http1.URL = strURL Http1.Timeout = lngTimeout Http2.URL = strURL Http2.Timeout = lngTimeout Http3.URL = strURL Http3.Timeout = lngTimeout Debug.Print "Execute 1" Http1.Get Content1, Headers1 Debug.Print "Execute 2" Http2.Get Content2, Headers2 Debug.Print "Execute 3" Http2.Get Content3, Headers3 Debug.Print "Start waiting" Do While (Http1.State <> httpCompleted) Or (Http2.State <> httpCompleted) Or (Http3.State <> httpCompleted) DoEvents Loop Debug.Print "Done waiting" End Sub The error is: Run-time error '9011'": A method is currently blocking the thread. Some Power Tcp methods are not reentrant. For example, if you set a timer and enter the Get method with a Timeout, and attempt to enter the Get method again, then this error is generated. This doesn't make sense to me because I believe with ZERO for timeout, these Gets should be non-blocking, and I should not get this error. Thanks for any advise. |
K M Drake From: Utica, NY USA Posts: 3406 Member Since: 07/14/00 |
posted April 30, 2002 11:00 AM Hi, Even in non-blocking, you must wait until one method call has executed before making a second with the same instance of the control. In your code, change: Http2.Get Content3, Headers3 to: Http3.Get Content3, Headers3 and you should be ok. -ken K M Drake Dart Tech Support |
| User69 Posts: 3 Member Since: 04/30/02 |
posted April 30, 2002 12:26 PM KM - Yes, you are right, how silly of me. I coded it correctly, and indeed had 3 instances running simultaneously in the same process. A feat not possible with the Microsoft Internet Transfer Control (even in SEPARATE processes!), a limitation which is not documented either, I might add. I will continue to do more in depth evaluation with our requirements, but so far it looks extremely good. Thank you for your very timely response. Best regards - Lee |
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