Question

createprocess() - how to set STARTUPINF.hStdInput

Asked by: rw8

Hello all,

I will want to have a main application and be able to send different text to control one or more external console application. (say test1.exe)  I am using createprocess to call this external program. Can someone show me the code by using writeconsole or writefile to make this work??

--- my code ---
int main(int argc, char* argv[])
{
               HANDLE OH = CreateFile( "output.txt", GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

    STARTUPINFO         siStartupInfo;
    PROCESS_INFORMATION piProcessInfo;

    memset(&siStartupInfo, 0, sizeof(siStartupInfo));
    memset(&piProcessInfo, 0, sizeof(piProcessInfo));
   
    siStartupInfo.cb = sizeof(siStartupInfo);

      
    if(CreateProcess("C:\\masters\\test1\\Debug\\test1.exe",     // Application name
                     NULL,                 // Application arguments
                     0,
                     0,
                     TRUE,
                     CREATE_NEW_CONSOLE,
                     0,
                     0,                              // Working directory
                     &siStartupInfo,
                     &piProcessInfo) == FALSE)
            return 0;
      siStartupInfo.dwFlags= STARTF_USESTDHANDLES ;      
      siStartupInfo.hStdInput=OH;

//trying to write something simple to the other console
      char buf[11];
      strcpy(buf, "hello");
      DWORD num;
      int succ;

      WriteFile(OH, buf, strlen(buf), NULL, NULL);
------------------

P.S. I notice that I cannot hv both NULL as the last two arguments in writefile function but I hv no idea what to put there... )

thx in advance!

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Asked On
2003-08-10 at 06:37:14ID20705187
Tags

createprocess

,

startupinfo

Topic

C++ Programming Language

Participating Experts
3
Points
75
Comments
9

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Answers

 

by: ChristopH1987Posted on 2003-08-10 at 06:42:08ID: 9116982

HI!

I think you should use named pipes or local RPC for this!

 

by: ChristopH1987Posted on 2003-08-10 at 06:42:43ID: 9116985

Please send me an E-Mail for further Questions!

 

by: _nn_Posted on 2003-08-10 at 06:44:18ID: 9116991

Rather than using files, the correct way to do what you want to do, is to use pipes. See :
http://support.microsoft.com/support/kb/articles/q190/3/51.asp
for more details and a good sample.

 

by: _nn_Posted on 2003-08-10 at 06:50:50ID: 9117009

ChristopH1987, you should (re)read this
http://www.experts-exchange.com/help/mistakes.jsp#2

Please, don't go any further in that direction...

 

by: jkrPosted on 2003-08-10 at 10:52:36ID: 9117756

 

by: jkrPosted on 2003-08-10 at 10:53:12ID: 9117760

Ooops, ignore my post, _nn_ already mentioned that article...

 

by: rw8Posted on 2003-08-10 at 21:43:40ID: 9119719

_nn_ : thanks for the page, I've actually read the page b4 :) but thanks anyway

the thing that I don't understand is that :rather than receiving inputs in the main console and pipe them straight to the child program, I will want to hv somehting like..
depending on the input : then send different msgs to my child,

say if input to main is 1
then i will want to send a to child

if input is 2
i will want to send aaa to child

how can I do that??

 

by: _nn_Posted on 2003-08-11 at 00:32:57ID: 9120524

> rather than receiving inputs in the main console and pipe them straight to the child program, I will want to hv somehting like..

Well, that's basic programming. If you want another behavior, change the code. In pseudo code, the sample has

get x
send x

Based upon your requirements, you need to write something like :

get x
swtch x
   case 1: send this
   case 2: send that

etc.

The code you need to modify is in GetAndSendInputThread()

 

by: rw8Posted on 2003-08-11 at 04:23:10ID: 9121364

and i c that writefile and readfile must be used in pairs aye?
that means what i read will be what i write, is that correct?
but i dont' want that to happen.. anyway to get over it?

20120131-EE-VQP-002

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