[ C ]Hide cmd popup when called by popen()

You can call the 'CreateProcess' WinAPI Function with the 'CREATE_NO_WINDOW' flag in the Set-UP of the object.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms682425(v=vs.85).aspx

http://msdn.microsoft.com/en-us/library/windows/desktop/ms684863(v=vs.85).aspx

 

Yes, look at the STARTUPINFO struct and the hStdOutput field (refer here for an example on creating a pipe so you can get this output). You will need to wait for the process to exit first before doing this. Use WaitForSingleObject with hProcess from the PROCESS_INFORMATION struct (last parameter) and INFINITE as the wait time.

 

Code:

BOOL Test()
{
// Create the read and write handles for stdout.
HANDLE stdOutHandles[2];

// Setup the security attributes.
SECURITY_ATTRIBUTES saAttr;
saAttr.nLength = sizeof(SECURITY_ATTRIBUTES); 
saAttr.bInheritHandle = TRUE; 
saAttr.lpSecurityDescriptor = NULL; 

// Create the pipe for stdout.
if(!CreatePipe(&stdOutHandles[0], &stdOutHandles[1], &saAttr, 0))
return FALSE;

PROCESS_INFORMATION pInfo;
ZeroMemory(&pInfo, sizeof(PROCESS_INFORMATION));

// Specify the pipe handle and make sure the window is hidden.
STARTUPINFO startInfo;
ZeroMemory(&startInfo, sizeof(STARTUPINFO));
startInfo.cb = sizeof(STARTUPINFO);
startInfo.hStdOutput = stdOutHandles[1];
startInfo.dwFlags |= STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
startInfo.wShowWindow = SW_HIDE;

// Call cscript.exe with slmgr.vbs -dlv as the parameters. Because of the nature of this command, I left the first parameter as NULL.
char expandedCScript[MAX_PATH];
ExpandEnvironmentStrings("%windir%\\System32\\cscript.exe //nologo \"%windir%\\System32\\slmgr.vbs\" -dlv", expandedCScript, MAX_PATH);
if(!CreateProcess(NULL, expandedCScript, NULL, NULL, TRUE, 0, NULL, NULL, &startInfo, &pInfo))
{
CloseHandle(stdOutHandles[0]);
CloseHandle(stdOutHandles[1]);
return FALSE;
}

// Wait for cscript.exe to exit.
WaitForSingleObject(pInfo.hProcess, INFINITE);

// Read the output from cscript.exe
char buffer[2048];
DWORD readBufferSize;
BOOL result;
if((result = ReadFile(stdOutHandles[0], buffer, 2048, &readBufferSize, NULL)))
{
// ReadFile does not null-terminate the buffer so we do that manually.
buffer[readBufferSize] = '\0';

// Display the output.
MessageBox(NULL, buffer, NULL, MB_OK);
}

// Close the handles.
CloseHandle(stdOutHandles[0]);
CloseHandle(stdOutHandles[1]);
CloseHandle(pInfo.hProcess);
CloseHandle(pInfo.hThread);

return result;
}

 

Not sure to be honest, I just used the MSDN example as a guide.