Visual Basic, VB6: Winsock senddata problem

VB6: Winsock senddata problem - help!

Author	Message
Bo Berglu #1 / 6	VB6: Winsock senddata problem - help! I cannot understand the logic behind the winsock component! I have an application that must communicate with another app via WinSock messages. I have set up a test environment where I have a simple Winsock "receive and display" application that shows what is sent from my main app and immediately responds to the message. The problem I have is that it seems like not all my messages actually get transmitted! In principle I have this sequence triggered by the click of a button in my application: - Send message (sckClient.Senddata sMsg) - Enter a wait loop for max 5 seconds waiting for a response. The loop has a doevents inside. - The socket DataArrival event receives the response and updates a variable that will break the wait loop. What actually happens is that the message sent is not received (hence not transmitted) until after the wait loop exits and my error message is posted. At this time my application reverts to idle state waiting for user input. So it seems to me that the WinSock component is not sending anything out before the whole sequence initiated by the button click has finished! Why is that so and how can I change it???? Note that I have put a lot of DoEvents here and there without any change to this. Bo Berglund Software developer in Sweden PGP: My public key is available at the following locations: Idap://certserver.pgp.com http://www.--*.com/ :11371
Wed, 18 Jun 1902 08:00:00 GMT

Bo Berglu #2 / 6	VB6: Winsock senddata problem - help! More strange findings: The remote server is sending data to the application. The DataArrival event is NOT fired! More data are sent but DataArrival is still not fired. Then the application itself sends a piece of data to the server and now the DataArrival event fires and all of the preceding messages are received! Why is there a connection between the sending and receiving functions like this??? Bo Berglund Software developer in Sweden PGP: My public key is available at the following locations: Idap://certserver.pgp.com http://pgpkeys.mit.edu:11371
Wed, 18 Jun 1902 08:00:00 GMT

mike_c.. #3 / 6	VB6: Winsock senddata problem - help! In article Quote: > More strange findings: > The remote server is sending data to the application. > The DataArrival event is NOT fired! > More data are sent but DataArrival is still not fired. > Then the application itself sends a piece of data to the server and Quote: > now the DataArrival event fires and all of the preceding messages are Quote: > received! > Why is there a connection between the sending and receiving functions Quote: > like this??? > Bo Berglund > Software developer in Sweden > PGP: My public key is available at the following locations: Quote: > Idap://certserver.pgp.com > http://pgpkeys.mit.edu:11371 I seem to be having a similar problem, except the send seems to complete eventually without any additional activity. My server app responds to several client apps. The problem seems to occur when it has to respond to several clients at once. I output debug messages which shows when the Senddata occurs. I also output debug messages when the Send Complete Event fires. The Senddata's all get called. The Send Complete Event fires for 2 out of 3 clients. Then about a minute later, the last Send Complete fires. I just started researching this problem. Hopefully, we'll find a solution soon! Mike. Sent via Deja.com http://www.deja.com/ Before you buy.
Wed, 18 Jun 1902 08:00:00 GMT

David Ra #4 / 6	VB6: Winsock senddata problem - help! Quote: > I seem to be having a similar problem, except the > send seems to complete eventually without any > additional activity. My server app responds to > several client apps. The problem seems to occur I was just glancing through when I saw this... I had similiar problems as well. I think its due to the fact that winsock is somewhat blocking. Even when you have multiple sockets controls on the form. Try this instead. Remove the control (ocx) from your tool box. Go to program references and browse for the component, but look for OCX, look for MSWINSCK.OCX and add it. Now you can code the control directly in your own objects. dim WithEvents ServerSocket as Winsock set ServerSocket = new WinSock Now you have the control directly inside your object, no need for a form. Also add code in the error event of your sockets. I found this to help as well. You might want to check out Catalyst.com for their socketwrench package... Well written socket replacement that works (I think) better than winsock, and it can use fast callback notifications rather than events (it can use both). When multiple sockets start responding, the slow event system looses data (I think) Hope this helps a little, David
Wed, 18 Jun 1902 08:00:00 GMT

Bo Berglu #5 / 6	VB6: Winsock senddata problem - help! Quote: >> I seem to be having a similar problem, except the >> send seems to complete eventually without any >> additional activity. My server app responds to >> several client apps. The problem seems to occur >I was just glancing through when I saw this... >I had similiar problems as well. I think its due to the fact that winsock >is somewhat blocking. >Even when you have multiple sockets controls on the form. Try this instead. >Remove the control (ocx) from your tool box. Go to program references and >browse for the component, but look for OCX, >look for MSWINSCK.OCX and add it. Now you can code the control directly in >your own objects. >dim WithEvents ServerSocket as Winsock >set ServerSocket = new WinSock >Now you have the control directly inside your object, no need for a form. >Also add code in the error event of your sockets. I found this to help as >well. >You might want to check out Catalyst.com for their socketwrench package... >Well written socket replacement that works (I think) better than winsock, >and it can use fast callback notifications rather than events (it can use >both). When multiple sockets start responding, the slow event system looses >data (I think) >Hope this helps a little, >David How do you put code in the events when you create the socket this way? There are no automatic generators availabe by selecting the component and browsing the proceduer list, I guess. Bo Berglund Software developer in Sweden PGP: My public key is available at the following locations: Idap://certserver.pgp.com http://pgpkeys.mit.edu:11371
Wed, 18 Jun 1902 08:00:00 GMT

Aida #6 / 6	VB6: Winsock senddata problem - help! Try inserting the line: DoEvents after the SendData line. It only appears to send the data when the processor is free. Aidan http://www.redrival.com/saturn/vbworld/ Quote: > In article > > More strange findings: > > The remote server is sending data to the > application. > > The DataArrival event is NOT fired! > > More data are sent but DataArrival is still not > fired. > > Then the application itself sends a piece of > data to the server and > > now the DataArrival event fires and all of the > preceding messages are > > received! > > Why is there a connection between the sending > and receiving functions > > like this??? > > Bo Berglund > > Software developer in Sweden > > PGP: My public key is available at the > following locations: > > Idap://certserver.pgp.com > > http://pgpkeys.mit.edu:11371 > I seem to be having a similar problem, except the > send seems to complete eventually without any > additional activity. My server app responds to > several client apps. The problem seems to occur > when it has to respond to several clients at > once. I output debug messages which shows when > the Senddata occurs. I also output debug > messages when the Send Complete Event fires. The > Senddata's all get called. The Send Complete > Event fires for 2 out of 3 clients. Then about a > minute later, the last Send Complete fires. I > just started researching this problem. > Hopefully, we'll find a solution soon! > Mike. > Sent via Deja.com http://www.deja.com/ > Before you buy.
Wed, 18 Jun 1902 08:00:00 GMT

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