CODEWITHSUNDEEP
c++windowsprocessconsole
teodron
teodron

Reputation: 1428

C++ Windows CreateChildProcess - hide/do not show the child process' console window

I need to create a child process as a socket listener/server for my main process and I use this call to achieve the goal:

bSuccess = CreateProcessA(NULL, 
            cmdLineArgs,   // command line 
            NULL,          // process security attributes 
            NULL,          // primary thread security attributes 
            TRUE,          // handles are inherited 
            HIGH_PRIORITY_CLASS,             // creation flags 
            NULL,          // use parent's environment 
            NULL,          // use parent's current directory 
            &siStartInfo,  // STARTUPINFO pointer 
            &piProcInfo);  // receives PROCESS_INFORMATION

Could anyone state what needs to be done in order for the child process' window not to show up? It's undesirable to have a visible process window each time the main, central process creates a child.

LATER EDIT I used:

HWND hWnd = GetConsoleWindow();
if (hWnd != 0) 
{       
    ShowWindow( hWnd, SW_HIDE);
}

in the child process main function, but this isn't really the best solution as the window still shows up for a fraction of a second. If one has several child processes, each with its own window bubbling onto the screen, it is still not elegant. Are there any flags to set for the compiler to produce a "console-less" output?

I'm using Visual Studio 2010.

Upvotes: 3

Views: 2842

Answers (3)

sb9
sb9

Reputation: 1082

siStartInfo.dwFlags &= STARTF_USESHOWWINDOW;
siStartInfo.wShowWindow = SW_HIDE;

should do it

Also look at http://msdn.microsoft.com/en-us/library/windows/desktop/ms686331(v=vs.85).aspx

Upvotes: 1

pagra
pagra

Reputation: 665

You must use the STARTUPINFO structure that you provide as parameter to CreateProcess. 

STARTUPINFO StartInfo= {sizeof(StartInfo)};
StartInfo.dwFlags= STARTF_USESHOWWINDOW;
StartInfo.wShowWindow= SW_HIDE;

Upvotes: 3

Sean Cline
Sean Cline

Reputation: 7179

The CREATE_NO_WINDOW flag is used for just this purpose.

You can add it to the dwCreationFlags bitmask like so:

bSuccess = CreateProcessA(NULL, 
            cmdLineArgs,   // command line 
            NULL,          // process security attributes 
            NULL,          // primary thread security attributes 
            TRUE,          // handles are inherited 
            HIGH_PRIORITY_CLASS | CREATE_NO_WINDOW,  // creation flags 
            NULL,          // use parent's environment 
            NULL,          // use parent's current directory 
            &siStartInfo,  // STARTUPINFO pointer 
            &piProcInfo);  // receives PROCESS_INFORMATION

Upvotes: 9

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