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Passing parameter to VB programs

Posted on 1998-07-21
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Last Modified: 2010-05-03
I am VB new user. Can  tell me how VB program pass and recieve parameter values from one program to another.  Thank you
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Question by:kentyo
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johnsand earned 20 total points
ID: 1466380
 Passing a parameter to Visual Basic is simple.  Anywhere within the program, just read the variable Command$. This variable will contain anything you have passed on the commandline of the program.  For Example:   RUNME.EXE TEST.CMD
COMMAND$ would contain TEST.CMD
  Returning a parameter is a little more difficult. The simplest way is to shell from one program to another and pass the commandline that you need. Then just handle the COMMAND$ variable. Another way is to write a file which contains the information you need to pass, then in your other programs, look for that file and read in the data. Still another way is to use the Windows Registry and save the values in there. The advantages of this are that the variables are preserved until you clear the registry keys. This way requires more coding, but is a cleaner way to do it.
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by:kentyo
ID: 1466381
Can I have sample code
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by:johnsand
ID: 1466382
 For the COMMAND$ the code is easy.

Sub Form_Load()
    'check if something was passed on the commandline
    if COMMAND$ <> "" then
        'if a /F is found then the user passed a filename
        if instr(COMMAND$,"/F") then
            'Parse the filename out and save it
            sFilename = Mid$(COMMAND$,instr(COMMAND$,"/F")+ 2)
        end if
    else
        msgbox "You must pass a filename as /Ffilename.ext"
    end if
end sub

  To pass the filename to a seperate program, just shell out like this

  lResult = shell("OTHER.EXE /F" + sFilename)
 
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