There are limits on the #msgs per thread etc, security issues eg Vista, System shutdown, system message hooks (which may throw messages away - and you have no way of knowing if this happens - e.g desktop/video managers), Journal hooks, Message deadlocks (have to be unlucky to get these).
Mind you some of these only apply to PostMessage. In essence, you do not have full control over SendMessage - lots of things can get in the way. I would always use a system wide Mutex/Semaphore etc in preference and WaitForMultipleObjectsEx. Myles From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Leigh Wanstead Sent: Tuesday, 8 May 2007 10:46 To: NZ Borland Developers Group - Delphi List Subject: RE: [DUG] Sending data between process on same computer on windows May I ask why sendmessage is not reliable? In what situation will cause sendmessage fail to break the communication? TIA Leigh -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Myles Penlington Sent: Tuesday, 8 May 2007 10:29 a.m. To: NZ Borland Developers Group - Delphi List Subject: RE: [DUG] Sending data between process on same computer on windows The devil is in the detail in this kind of stuff, and your actual implementation can have a great effect. As implied, the best method will be to develop 2 or 3 different methods, test and compare the results. Myles. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Conor Boyd Sent: Tuesday, 8 May 2007 10:19 To: NZ Borland Developers Group - Delphi List Subject: RE: [DUG] Sending data between process on same computer on windows Sorry Leigh, I haven't done enough testing with big volume messages to be able to answer that for you. I was more interested in something that worked and was reliable. Cheers, Conor ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Leigh Wanstead May I ask which is faster, ipc or sendmessage? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Conor Boyd I found the IPC functionality from madshi.net (http://help.madshi.net/IPC.htm <http://help.madshi.net/IPC.htm> ) to work very nicely. I needed a way to send messages from a screensaver I was writing to another process on the same box, and SendMessage didn't seem to work when a screensaver was active (which I found strange, but anyway...), and the IPC stuff from madshi works flawlessly. ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Leigh Wanstead May I ask what is the fastest way to send data between process on same computer on windows? I assume sendmessage api faster than semaphore waiting, of course faster than TCP/IP which will go through huge amounts of tcp/ip stack. I just want lowest overhead on per call. Anyone have any experiences on that? Attention: This communication is confidential and may be legally privileged. If you are not the intended recipient, please do not use, disclose, copy or distribute it, other than to return it to us with your confirmation that it has been deleted from your system. Attention: This communication is confidential and may be legally privileged. If you are not the intended recipient, please do not use, disclose, copy or distribute it, other than to return it to us with your confirmation that it has been deleted from your system.
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