How can I execute a command like for example using system(); but execute so the program does not need to wait until the function returns before it continues.
Also when executing a command using system(); can you make it so that the console window does not pop up onto the screen.
Thanks.
You can't do any of those things with system() function. You need to use more os-specific api calls. MS-Windows use CreateProcess(), don't know about *nix.
You should use the windows api instead of using system.
for *nix I think you can postfix your command with &. This will allow system() to return immediately.
Oh right, so when using CreateProcess(), how would commands be executed as if it was done by system()? would I call cmd.exe and then specify the command as a parameter to cmd.exe or something along those lines?
No you don't run cmd.exe at all, read about the parameters at MSDN here -- the second-to-last parameter has an option to run the process without a window. And CreateProcess() will run without waiting for the process to finish.
>>for *nix I think you can postfix your command with &.
I don't think that works inside a c++ program, only from a shell program.
>I don't think that works inside a c++ program, only from a shell program.
No it works. Just tested it.
#include<iostream>
using namespace std;
int main()
{
system("emacs&");
return 0;
}starts emacs and returns immediately
If you don't wanna be platform dependent you can still do this by forking a thread for system(). Should be simple enough as well.
pid = fork() ;
if( 0 == pid )
system("...") ;
//your normal code here..We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.