How to redirect console output to a file 2

[rlev]

Hi Guys,

I spawn a child process using Createprocess API...this part is working fine but now I want to redirect the stderr output of the child process to a file....How I can do that?

My code snippet :


STARTUPINFO si;
PROCESS_INFORMATION pi;
memset(&pi, 0, sizeof(pi));
memset(&si, 0, sizeof(si));
si.cb = sizeof(si);
si.dwFlags = STARTF_USESHOWWINDOW;

si.wShowWindow = SW_NORMAL

int res = CreateProcessW(NULL, // Start the Process
PROCESS_PATH.c_str(),
NULL, NULL, NULL, NULL, NULL, NULL, &si,&pi);

if (res) {

// Do something
}


CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);



Any help would be apprecciate it.

Thank you

 

[2ffat]

It's been a while since I've done this but try

PROCESS_PATH += " > ErrFile.txt";
 int res = CreateProcessW(NULL, PROCESS_PATH.c_str(), NULL, NULL, NULL, NULL, NULL, NULL, &si,&pi);

Thus if PROCESS_PATH was "C:\MyApp.exe", it would become "C:\MyApp.exe > ErrFile.txt" just like you had run it from the console.




James P. Cottingham
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[TonHu]

output redirection is a feature of cmd.exe, not of CreateProcessW. There are other ways of doing this (probably passing the right handles to CreateProcessW), but I'm not into C++, so can't tell you how, sorry.

 

[rlev]

Thank you Guys.

I will try both approaches and I will let you know if it works.

Rlev

 

[rlev]

Hi Guys I just solved it using TonHu advice.

The information in this link is very useful:

http://social.msdn.microsoft.com/forums/en-US/vcgeneral/thread/5a1811ad-2def-4e8c-a07d-884abb5cfd43

2ffat aproach works too but i just wanted to use plain Win apis.


Thanks again