system call in c++ opens a new terminal . windows

Question

I am trying out system command in c++ .

std::string cmd = " DIR > d:\a.txt" ; 
int isystemOut2 = system (cmd.c_str());

When I run it , I see that d:\a.txt has the right output but I see a command prompt open and close immediately . Is there a way to stop that opening of a new command prompt .

Answer 1

You could use a windows API function. For example CreateProcess.

STARTUPINFOW si;
PROCESS_INFORMATION pi;

ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
ZeroMemory(&pi, sizeof(pi));

if (CreateProcessW(cmd, arg, NULL, NULL, FALSE, CREATE_NO_WINDOW, NULL, NULL, &si, &pi))
{
    WaitForSingleObject(pi.hProcess, INFINITE);
    CloseHandle(pi.hProcess);
    CloseHandle(pi.hThread);
}