reading stdout

[Chris Losinger]

i have a library, which i can not modify. this library is called from a console app, and as part of its processing, this library dumps a large and variable amount of debug/trace info to stdout. i'd like to be able to read what the library is sending to stdout from the calling code, in order to extract certain pieces of info for analysis. basically, i want to capture some of what the library prints during a call, save that info away until the call completes, then re-print the info in a better format. this would help me from having to search the hundreds of lines of output to find the particular bits i need. (this is Windows, C++) is such a thing possible?

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[Albert Holguin]

Have you tried redirection operators[^]?

[Chris Losinger]

i need to do this within the calling app, not from the shell.

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[Albert Holguin]

Do you need this for trouble-shooting or all the time? ...because it sounded like you just needed for troubleshooting, in which case... why not use the shell options? ..but otherwise, you can always try reassigning the stream using freopen[^]. Here's an actual example... http://support.microsoft.com/kb/58667[^]

[Chris Losinger]

Albert Holguin wrote:

Do you need this for trouble-shooting or all the time

all the time.

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[Albert Holguin]

Ok, try out the freopen option... hopefully that gets the job done.

[Lost User]

Hey Chris, Creating a Child Process with Redirected Input and Output[^] If you don't get any redirected output from the sample above... then your third-party console app might be writing to the STD_ERROR_HANDLE rather than the STD_OUTPUT_HANDLE. GetStdHandle function[^]. Best Wishes, -David Delaune