i took some time to test the "process.c" file you gave in your first post.
i can see some reasons why the output is slow and delayed:
- you declare a buffer for holding data coming from the pipe which is 8000 byte big (good) then you read data by chunk of 5 bytes (bad !). use
sizeof( PipeData ) as the third parameter to
PeekNamedPipe and
ReadFile. this would GREATLY improve performances (greatly as in 1600 times faster !)
-
PeekNamedPipe actually reads data from the pipe into the buffer, so you first read them using
PeekNamedPipe, and re-read them using
ReadFile. you should set the second parameter to
PeekNamedPipe to NULL to disable reading data when peeking. (alternatively, you could create a named pipe in non-blocking mode, but this is discouraged by microsoft)(this should make the output about 2 times faster).
- last, your way of appending to the textbox is wrong: you first read everything, append your text, clear the textbox and write everything back. i can imagine when you have 5minutes of continuous output into your textbox: i hope it will never go beyond the 4KB buffer size you allocated to hold that ! try appending the text, it will be much faster (exp(N) faster where N is the number of lines written in the textbox)
now, Marty_H said:
"It is expected that your executable launched from the batch file would not terminate when you abort your CVI program."
this statement sounds wrong: CreateProcess creates a child process running cmd.exe which in turns creates a child process running the final executable. when aborting the CVI program, every child processes should abort too ! in fact the original posts tells us that cmd.exe does indeed abort but not the final executable. i would suggest to launch the executable without going through a batch file. also check the options for cmd.exe: it should wait gently until everything is finished not exit before the end of the batch. are you sure your batch file does not use the start command to spawn your executable ?
hope this helps...
