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Run external program

PSArcOnlinePSArcOnline

Hello,

I try to run a external program from within arcmap.

Wherefore I made a model with the model builder. So I can select a point in my shape, run my model and the external program should run with a variable from this point. To start the program I use a simple python script.

To explain my problem, I have included the following line of code with which I started. If I uses this, the script does nothing, no error and no execution of anything:

os.system(r'C:\Program Files (x86)\AquaInfo\AI-Viewer.exe SystemMDW=C:\Program Files (x86)\AquaInfo\Aqua.mdw|UserMDB=C:\Program Files (x86)\AquaInfo\System\AI_mbn.mdb|DataBaseName=C:\Users\ps\Desktop\atest\Test.mdb|UserId=99999998|ObjIdsList=7297|SelObjId=7297|ObjType= 0|')

If I put this into windows cmd the program starts:

If I am using this python code in my module, the program starts with an error because obviously some variables are not set:

os.system(r'"C:\Program Files (x86)\AquaInfo\AI-Viewer.exe"')

Same if I try this:

os.system(r'"C:\Program Files (x86)\AquaInfo\AI-Viewer.exe"' + " SystemMDW=C:\Program Files (x86)\AquaInfo\Aqua.mdw")

As soon as I enter the Pipe Character "|" the script doesn't work any more. I tried to replace "|" with chr(124) but still the same error.

os.system(r'"C:\Program Files (x86)\AquaInfo\AI-Viewer.exe"' + " SystemMDW=C:\Program Files (x86)\AquaInfo\Aqua.mdw|")

I am not very firm with python, I am more experienced in vbs. Is there a problem with the "|" Character in Python Strings then it is used for a path with os.system?

How can I solve this.

Any ideas?

Thanks for your help.

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Accepted answers

ShaunWalbridge

The reason that the pipe character is special, is on UNIX based operating systems, it's used to denote steps in a pipeline, and is handled specially. In your case this isn't what you want, I'd recommend using the subprocess module instead of os.system:

import subprocess
subprocess.call([r'C:\Program Files (x86)\AquaInfo\AI-Viewer.exe',
                 r'SystemMDW=C:\Program Files (x86)\AquaInfo\Aqua.mdw|UserMDB=C:\Program Files (x86)\AquaInfo\System\AI_mbn.mdb|DataBaseName=C:\Users\ps\Desktop\atest\Test.mdb|UserId=99999998|ObjIdsList=7297|SelObjId=7297|ObjType= 0|'])

I don't have the AquaInfo software to test against, but in an example script, that passed the arguments correctly.

Cheers,

Shaun

All comments

PSArcOnlinePSArcOnline

Thank you both for the help.

subprocess did the trick.

And thanks for the "Pipe" explanation.

rzufelt

I had something "similar", trying to pass values to the external gpg.exe program.

Here is how I resolved it:

TheCommand = "gpg.exe --homedir ./Dependencies --passphrase MyPassword --output C:/crashdata/" + fname.replace('.ASC','.CSV') +" --decrypt " + fname
           
os.system(TheCommand)

Basically, I keep trying the string concatenation in IDLE (or your favorite interpreter) until the string looks exactly like I need it (all pipes, tags, etc.) then os.system on the variable containing the string.

I see Shaun posted while I was typing. I think the subprocess.call would be the "proper" way, but with my gpg.exe one, I could not get the subprocess to work, no matter how I tried.

ShaunWalbridge

import subprocess
subprocess.call([r'C:\Program Files (x86)\AquaInfo\AI-Viewer.exe',
                 r'SystemMDW=C:\Program Files (x86)\AquaInfo\Aqua.mdw|UserMDB=C:\Program Files (x86)\AquaInfo\System\AI_mbn.mdb|DataBaseName=C:\Users\ps\Desktop\atest\Test.mdb|UserId=99999998|ObjIdsList=7297|SelObjId=7297|ObjType= 0|'])

I don't have the AquaInfo software to test against, but in an example script, that passed the arguments correctly.

Cheers,

Shaun

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