Programming Tips - How do I use CreateProcess() ?
Q. How do I use CreateProcess() ?
A. Sooner or later you'll want something more powerful than WinExec().
The next step up is CreateProcess() but its not easy to use.
It took me some trial and error to figure this out.
Here is a function called ExecCommand() launches a new process
and gets the process ID back.
// szExe: [in] full path to the .exe file you want to run
// szCmdLine: [in] the command followed by any option you want
// bWait: [in] wait for the command to run?
// dwProcessId: [out] the process ID of the new process if it worked
BOOL ExecCommand(LPCSTR szExe, LPCSTR szCmdLine, BOOL bWait, DWORD &dwProcessId)
dwProcessId = 0;
si.cb = sizeof(STARTUPINFO); // You need to set the size or it doesn't work
bResult = CreateProcess(
(LPSTR)szExe, // pointer to name of executable module
(LPSTR)szCmdLine, // pointer to command line string
NULL, // pointer to process security attributes
NULL, // pointer to thread security attributes
FALSE, // handle inheritance flag
0, // creation flags
NULL, // pointer to new environment block
NULL, // pointer to current directory name
&si, // pointer to STARTUPINFO
&pi // pointer to PROCESS_INFORMATION
DWORD timeout_seconds = 10;
WaitForSingleObject(pi.hProcess, timeout_seconds * 1000);
dwProcessId = pi.dwProcessId;
// You get back two open handles if the process has been successfully created.
// But, in this case, we don't want them so close them so we don't leak handles.
DWORD dwError = GetLastError();
// You can do something with dwError here if you want