How can we execute multiple cmd commands in one session using C++ Lib Function or Windows API?

Question

Before running a cmd command in c++, I want to set some temporary environment variable, Which gets deleted with end of command line session. for eg before executing below cmd command, I want to set P4PASSWD perforce environment variable.

sprintf_s(p4Command, 500, "/C p4.exe print -o \"%s\" -q %s", destination, source);

LPCSTR Command = p4Command;

ShellExecute(0, "open", "cmd.exe", Command, 0, SW_HIDE);

This can be possible if we are allowed to execute multiple cmd commands in one session. But I don't know how it can be achieved.Please let me know if some more inputs are required.

Answer 1

Use CreateProcess to run p4.exe and pass a set of environment variables in the lpEnvironment parameter.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms682009%28v=vs.85%29.aspx

CreateProcess gives you added benefits; you can wait for the process to terminate, you can retrieve the exit code etc.

Answer 2

Don't set environment variables for your own process as Gunther suggested earlier. The 7th parameter to CreateProcess is a new set of environment variables.