How to call CMD without opening a window

Question

I've an C++ method (using Visual Studio, if it helps) that calls to cmd like this:

start \B example.exe arg1 arg2 arg3 

The problem is that this call opens a (cmd) window. If i have another cmd opened, \B works, but if not, it opens a new window.

I also tried without start \B but it's the same....

I want to avoid this new window, but I don't know how. Any idea?

Answer 1

I dont know how to do it in C++ but to open a new command prompt window that is also minimized (or "hidden") using a batch file i would use:

start /min cmd 

Or if you start the command prompt you can type:

@echo off cls && start /b cmd 

This restarts the current command prompt window with out closing it, however all previously set environment variables are reset. Hope this helps!

(PS. This was tested and was successful on Windows 7 Ultimate OS)

Answer 2

You can use the /C /Q switch

cmd.exe /c /q dir/b 

this will run the dir/b command and exit no window will be shown since we are settng the ECHO off with the /q, but if you want to see the output before it closes then don't use the /q switch as

cmd.exe /c dir/b 

The above two examples will be too quick to execute so please try with this

cmd /c  dir/b/s  cmd /c /q dir/b/s 

Since the dir /b /s will run through each sub-directory you can see it working.

In case you want to run the command with no window still want to get the output then pipe the clip command with it.

cmd /c dir/b|clip 

This will copy the output of the command in the clipboard and that you can paste ti elsewhere, if the clipboard is not overwritten.

This has been tested in Windows 7 with Microsoft Windows [Version 6.1.7601] it might differ with other systems

For more information on cmd.exe just type cmd /? in the prompt to get the following:

Starts a new instance of the Windows command interpreter  CMD [/A | /U] [/Q] [/D] [/E:ON | /E:OFF] [/F:ON | /F:OFF] [/V:ON | /V:OFF]     [[/S] [/C | /K] string]  /C      Carries out the command specified by string and then terminates /K      Carries out the command specified by string but remains /S      Modifies the treatment of string after /C or /K (see below) /Q      Turns echo off /D      Disable execution of AutoRun commands from registry (see below) /A      Causes the output of internal commands to a pipe or file to be ANSI /U      Causes the output of internal commands to a pipe or file to be         Unicode /T:fg   Sets the foreground/background colors (see COLOR /? for more info) /E:ON   Enable command extensions (see below) /E:OFF  Disable command extensions (see below) /F:ON   Enable file and directory name completion characters (see below) /F:OFF  Disable file and directory name completion characters (see below) /V:ON   Enable delayed environment variable expansion using ! as the         delimiter. For example, /V:ON would allow !var! to expand the         variable var at execution time.  The var syntax expands variables         at input time, which is quite a different thing when inside of a FOR         loop. /V:OFF  Disable delayed environment expansion.  Note that multiple commands separated by the command separator '&&' are accepted for string if surrounded by quotes.  Also, for compatibility reasons, /X is the same as /E:ON, /Y is the same as /E:OFF and /R is the same as /C.  Any other switches are ignored.  If /C or /K is specified, then the remainder of the command line after the switch is processed as a command line, where the following logic is used to process quote (") characters:      1.  If all of the following conditions are met, then quote characters         on the command line are preserved:          - no /S switch         - exactly two quote characters         - no special characters between the two quote characters,           where special is one of: &<>()@^|         - there are one or more whitespace characters between the           two quote characters         - the string between the two quote characters is the name           of an executable file.      2.  Otherwise, old behavior is to see if the first character is         a quote character and if so, strip the leading character and         remove the last quote character on the command line, preserving         any text after the last quote character.  If /D was NOT specified on the command line, then when CMD.EXE starts, it looks for the following REG_SZ/REG_EXPAND_SZ registry variables, and if either or both are present, they are executed first.      HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\AutoRun          and/or      HKEY_CURRENT_USER\Software\Microsoft\Command Processor\AutoRun  Command Extensions are enabled by default.  You may also disable extensions for a particular invocation by using the /E:OFF switch.  You can enable or disable extensions for all invocations of CMD.EXE on a machine and/or user logon session by setting either or both of the following REG_DWORD values in the registry using REGEDIT.EXE:      HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\EnableExtensions          and/or      HKEY_CURRENT_USER\Software\Microsoft\Command Processor\EnableExtensions  to either 0x1 or 0x0.  The user specific setting takes precedence over the machine setting.  The command line switches take precedence over the registry settings.  In a batch file, the SETLOCAL ENABLEEXTENSIONS or DISABLEEXTENSIONS arguments takes precedence over the /E:ON or /E:OFF switch. See SETLOCAL /? for details.  The command extensions involve changes and/or additions to the following commands:      DEL or ERASE     COLOR     CD or CHDIR     MD or MKDIR     PROMPT     PUSHD     POPD     SET     SETLOCAL     ENDLOCAL     IF     FOR     CALL     SHIFT     GOTO     START (also includes changes to external command invocation)     ASSOC     FTYPE  To get specific details, type commandname /? to view the specifics.  Delayed environment variable expansion is NOT enabled by default.  You can enable or disable delayed environment variable expansion for a particular invocation of CMD.EXE with the /V:ON or /V:OFF switch.  You can enable or disable delayed expansion for all invocations of CMD.EXE on a machine and/or user logon session by setting either or both of the following REG_DWORD values in the registry using REGEDIT.EXE:      HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\DelayedExpansion          and/or      HKEY_CURRENT_USER\Software\Microsoft\Command Processor\DelayedExpansion  to either 0x1 or 0x0.  The user specific setting takes precedence over the machine setting.  The command line switches take precedence over the registry settings.  In a batch file the SETLOCAL ENABLEDELAYEDEXPANSION or DISABLEDELAYEDEXPANSION arguments takes precedence over the /V:ON or /V:OFF switch. See SETLOCAL /? for details.  If delayed environment variable expansion is enabled, then the exclamation character can be used to substitute the value of an environment variable at execution time.  You can enable or disable file name completion for a particular invocation of CMD.EXE with the /F:ON or /F:OFF switch.  You can enable or disable completion for all invocations of CMD.EXE on a machine and/or user logon session by setting either or both of the following REG_DWORD values in the registry using REGEDIT.EXE:      HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\CompletionChar     HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\PathCompletionChar          and/or      HKEY_CURRENT_USER\Software\Microsoft\Command Processor\CompletionChar     HKEY_CURRENT_USER\Software\Microsoft\Command Processor\PathCompletionChar  with the hex value of a control character to use for a particular function (e.g.  0x4 is Ctrl-D and 0x6 is Ctrl-F).  The user specific settings take precedence over the machine settings.  The command line switches take precedence over the registry settings.  If completion is enabled with the /F:ON switch, the two control characters used are Ctrl-D for directory name completion and Ctrl-F for file name completion.  To disable a particular completion character in the registry, use the value for space (0x20) as it is not a valid control character.  Completion is invoked when you type either of the two control characters.  The completion function takes the path string to the left of the cursor appends a wild card character to it if none is already present and builds up a list of paths that match.  It then displays the first matching path.  If no paths match, it just beeps and leaves the display alone.  Thereafter, repeated pressing of the same control character will cycle through the list of matching paths.  Pressing the Shift key with the control character will move through the list backwards.  If you edit the line in any way and press the control character again, the saved list of matching paths is discarded and a new one generated.  The same occurs if you switch between file and directory name completion.  The only difference between the two control characters is the file completion character matches both file and directory names, while the directory completion character only matches directory names. If file completion is used on any of the built in directory commands (CD, MD or RD) then directory completion is assumed.  The completion code deals correctly with file names that contain spaces or other special characters by placing quotes around the matching path. Also, if you back up, then invoke completion from within a line, the text to the right of the cursor at the point completion was invoked is discarded.  The special characters that require quotes are:      <space>      &()[]{}^=;!'+,`~