The reason behind the second one is security - which is even tighter on Vista. You can no longer do a SendMessage to a process running at a higher security level, and for that matter from a interactive program to a service - all due to security restrictions that have been added in recent years by M$ to stop viruses etc. E.g In Vista you can no longer allow a service to interact with the desktop.
Things need to be running on the same window station (which is the root of all security in windows). If you have processes running on different window stations (which applies to services etc), then you will have security issues. Myles. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Leigh Wanstead Sent: Tuesday, 8 May 2007 11:18 To: NZ Borland Developers Group - Delphi List Subject: RE: [DUG] Sending data between process on same computer on windows Hi Conor, Thanks Regards Leigh -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Conor Boyd Sent: Tuesday, 8 May 2007 11:04 a.m. To: NZ Borland Developers Group - Delphi List Subject: RE: [DUG] Sending data between process on same computer on windows I've already given you one scenario (although I admit it's not one that's going to bother most people), and couldn't find any doco anywhere to describe why Send/PostMessage failed in that instance. Another scenario was described on the page I linked to: "The easiest way to do such IPC (inter process communication) is to use the message APIs like FindWindow + PostMessage. Unfortunately messages may not work inside of non interactive service/system processes in the NT family." C. ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Leigh Wanstead May I ask why sendmessage is not reliable? In what situation will cause sendmessage fail to break the communication? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Myles Penlington 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. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Conor Boyd 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.
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