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<DIV dir=ltr align=left><SPAN class=897040123-07052007><FONT face=Arial
color=#0000ff size=2>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.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=897040123-07052007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=897040123-07052007><FONT face=Arial
color=#0000ff size=2>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."</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=897040123-07052007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=897040123-07052007><FONT face=Arial
color=#0000ff size=2>C.</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
</DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT size=2><FONT
face=Tahoma><B>From:</B> delphi-bounces@delphi.org.nz
[mailto:delphi-bounces@delphi.org.nz] <B>On Behalf Of </B>Leigh
Wanstead<BR><SPAN class=897040123-07052007><FONT face=Arial
color=#0000ff> </FONT></SPAN></FONT></FONT></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT size=2><SPAN
class=864504422-07052007><FONT face=Arial color=#0000ff>May I ask why
sendmessage is not reliable? In what situation will cause sendmessage fail to
break the communication?</FONT></SPAN></FONT></DIV>
<BLOCKQUOTE>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> delphi-bounces@delphi.org.nz
[mailto:delphi-bounces@delphi.org.nz]<B>On Behalf Of </B>Myles
Penlington<BR></FONT></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><SPAN
class=897040123-07052007><FONT color=#0000ff
size=2> </FONT></SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">The
devil is in the detail in this kind of stuff, and your actual implementation
can have a great effect.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'">As
implied, the best method will be to develop 2 or 3 different methods, test and
compare the results.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri','sans-serif'"><o:p> </o:p></SPAN></P>
<DIV>
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<P class=MsoNormal><B><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">
delphi-bounces@delphi.org.nz [mailto:delphi-bounces@delphi.org.nz] <B>On
Behalf Of </B>Conor Boyd<BR></SPAN></P></DIV></DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'"><SPAN
class=897040123-07052007> </SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">Sorry
Leigh, I haven't done enough testing with big volume messages to be able to
answer that for you.</SPAN><o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">I was
more interested in something that worked and was
reliable.</SPAN><o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">Cheers,</SPAN><o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">Conor</SPAN><o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=EN-US>
<HR align=center width="100%" SIZE=2>
</SPAN></DIV>
<P class=MsoNormal><B><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">
delphi-bounces@delphi.org.nz [mailto:delphi-bounces@delphi.org.nz] <B>On
Behalf Of </B>Leigh Wanstead<BR></SPAN><SPAN lang=EN-US
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'"> </SPAN><SPAN
lang=EN-US><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">May I
ask which is faster, ipc or sendmessage?</SPAN><SPAN
lang=EN-US><o:p></o:p></SPAN></P>
<BLOCKQUOTE style="MARGIN-TOP: 5pt; MARGIN-BOTTOM: 5pt; MARGIN-RIGHT: 0cm">
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">-----Original
Message-----<BR><B>From:</B> delphi-bounces@delphi.org.nz
[mailto:delphi-bounces@delphi.org.nz]<B>On Behalf Of </B>Conor
Boyd<BR></SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'"> </SPAN><o:p></o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">I
found the IPC functionality from madshi.net (</SPAN><SPAN
style="FONT-SIZE: 10pt"><A href="http://help.madshi.net/IPC.htm"><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'">http://help.madshi.net/IPC.htm</SPAN></A></SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">) to
work very nicely.</SPAN><o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">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.</SPAN><o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN
lang=EN-US>
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</SPAN></DIV>
<P class=MsoNormal><B><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">
delphi-bounces@delphi.org.nz [mailto:delphi-bounces@delphi.org.nz] <B>On
Behalf Of </B>Leigh Wanstead<BR></SPAN><SPAN lang=EN-US
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'"> </SPAN><SPAN
lang=EN-US><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">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?</SPAN><FONT face=Verdana
size=1></P></BLOCKQUOTE></DIV></BLOCKQUOTE></FONT></BODY></HTML>