winapi: CreateProcess but hide the process' window?

问题:

I am using CreateProcess to create a cmd.exe process that is passed a parameter that it executes and quits, this makes command prompt flash up on the screen.

I tried to avoid this by setting STARTUPINFO struct wShowWindow to SW_HIDE but this parameter seems to affect the calling window, not the window for the process that gets executed.

Is there anyway that you can use createprocess to launch a program that is hidden from view?

Also what is the proper winapi standard way to get enviroment variables?

回答1:

If its just a console app you can also use the CREATE_NO_WINDOW flag as part of the CreateProcess call itself, e.g.

CreateProcess(NULL, lpszCommandLine, NULL, NULL, FALSE,                CREATE_NO_WINDOW, NULL, NULL, &si, &pi); 

Also, see this page for information about environment variables.

回答2:

The following link here describes how to create the window silently:

DWORD RunSilent(char* strFunct, char* strstrParams) {     STARTUPINFO StartupInfo;     PROCESS_INFORMATION ProcessInfo;     char Args[4096];     char *pEnvCMD = NULL;     char *pDefaultCMD = "CMD.EXE";     ULONG rc;      memset(&StartupInfo, 0, sizeof(StartupInfo));     StartupInfo.cb = sizeof(STARTUPINFO);     StartupInfo.dwFlags = STARTF_USESHOWWINDOW;     StartupInfo.wShowWindow = SW_HIDE;      Args[0] = 0;      pEnvCMD = getenv("COMSPEC");      if(pEnvCMD){          strcpy(Args, pEnvCMD);     }     else{         strcpy(Args, pDefaultCMD);     }      // "/c" option - Do the command then terminate the command window     strcat(Args, " /c ");      //the application you would like to run from the command window     strcat(Args, strFunct);       strcat(Args, " ");      //the parameters passed to the application being run from the command window.     strcat(Args, strstrParams);       if (!CreateProcess( NULL, Args, NULL, NULL, FALSE,         CREATE_NEW_CONSOLE,          NULL,          NULL,         &StartupInfo,         &ProcessInfo))     {         return GetLastError();           }      WaitForSingleObject(ProcessInfo.hProcess, INFINITE);     if(!GetExitCodeProcess(ProcessInfo.hProcess, &rc))         rc = 0;      CloseHandle(ProcessInfo.hThread);     CloseHandle(ProcessInfo.hProcess);      return rc;  } 

I think getenv and setenv are all okay? I am not sure what you are asking about in that respect.

回答3:

set the STARTF_USESHOWWINDOW in dwFlags

by sharptooth

回答4:

This might be an overkill for your needs, but you can hook the ShowWindow API and never show any windows for that process

文章来源: winapi: CreateProcess but hide the process' window?