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Eliad Moshe

Accessing STDOUT of a child process

4 posts in this topic

Hi guys,

I am trying to access the STDOUT of a child console application,
At first I tried to use Anonymous Pipes with Info from:

http://msdn.microsoft.com/en-us/library/ms682499%28VS.85%29.aspx
http://www.codeproject.com/Articles/5531/Redirecting-an-arbitrary-Console-s-Input-Output

then, I found this page at Microsoft Support : http://support.microsoft.com/kb/190351 that states:

"Note Child processes that use such C run-time functions as printf() and fprintf() can behave poorly when redirected. The C run-time functions maintain separate IO buffers. When redirected, these buffers might not be flushed immediately after each IO call. As a result, the output to the redirection pipe of a printf() call or the input from a getch() call is not flushed immediately and delays, sometimes-infinite delays occur. This problem is avoided if the child process flushes the IO buffers after each call to a C run-time IO function. Only the child process can flush its C run-time IO buffers. A process can flush its C run-time IO buffers by calling the fflush() function."

Any Idea what can I do in order to  solve this besides modifying the source?
 

Edited by Eliad Moshe
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Thanks frob for your help,

Should it works well with function calls like printf() at the called child process?
I used this source as a reference and the Read function from the calling process is blocking 'infinitely'..

 

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Probably.

In the Unix world people are very careful about getting data from stdin and stdout, building tools that are lightweight and are designed to be invoked by other programs.

In the Windows world, everything is designed around the screen. Many programs unintentionally (or intentionally) will not work when invoked by other programs.

If the program is getting input from the stdin stream and writing to stdout, then yes, everything should work. You need to feed it all the data that would normally be typed by the user and you need to read the values that would show up on the screen.

If the program tries to get fancy with non-stream console I/O or creating its own text console or doing other stuff that is increasingly common in the Windows world, then all bets are off.
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If the program tries to get fancy with non-stream console I/O or creating its own text console or doing other stuff that is increasingly common in the Windows world, then all bets are off.

Yep //

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