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Calling another program

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Calling another program C programming forum discussing all C derivatives, including C#, C++, Object-C, and even plain old vanilla C. These languages are low level languages, and used on projects such as device drivers, compilers, and even whole computer operating systems.

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  #1  
Old November 8th, 2002, 07:30 AM
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Calling another program
Have a question...

How do you call another .exe from within a command line program so that I can pass it parameters?

Eric
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Old November 8th, 2002, 12:42 PM
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CreateProcess() ought to do it.
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Old November 8th, 2002, 01:01 PM
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you can use the imho easier function ShellExecute from shell32.dll.
the syntax (from the MS Windows SDK) is:
Code:
HINSTANCE ShellExecute(
    HWND hwnd,	// handle to parent window
    LPCTSTR lpOperation,	// pointer to string that specifies operation to perform
    LPCTSTR lpFile,	// pointer to filename or folder name string
    LPCTSTR lpParameters,	// pointer to string that specifies executable-file parameters 
    LPCTSTR lpDirectory,	// pointer to string that specifies default directory
    INT nShowCmd 	// whether file is shown when opened
   );

[edit]
the only thing that was unclear to me first was "lpOperation" which should be "open"
[/edit]
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Last edited by M.Hirsch : November 8th, 2002 at 01:10 PM.
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Old November 8th, 2002, 01:03 PM
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A portable solution would be to use popen, which allows complete command line option passing. It's generally part of stdio.h in modern compilers. As a bonus the input and output are available to the calling program.

If you want the program to present it's interface to the end user, the aforementioned CreateProcess is the way to go.
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Old November 8th, 2002, 07:18 PM
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Thanks guys. I'll try to get working on these tonight if I can scrape time away from my daughter.

Eric
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