App, opening a file via windows shell commands: "a device attached to the system does not work.


I hope that someone here will be able to throw some lights on my question, if I post this is the wrong place please let me know because I was directed here (which forum? ). OK, I support and develop custom applications. An older application especially written in Delphi allows users to attached documents (pdf, jpg, txt, etc.) to the records of equipment in a data base. Later users can view these records of equipment and press a button to display the document.

When the user presses the button to view the document, the application uses the folder variable to save the document to the temporary path and then asks windows via a shell command to open the file. The appeal of Delphi for windows used is the following:

ShellExecute (GetDesktopWindow, 'open', PChar (TempFile), ",", SW_SHOWNORMAL);

Normally this process works very well, we have had no problems so far. On a single computer (windows xp pro with Service Pack 3) belonging to a client, instead of opening the file, windows returns the system 31 error and the message ""a device attached to the system is not functioning. ". is displayed.

* If I navigate to the location where the file is stored on the disk and try to open it, software adobe reader opens the file correctly.

* I found some suggestions that the file extension is associated properly. PDF associated with Notepad, I changed, and the application could ask windows to open the file very well. Open the file from the location on the work of disc as well. Change the file for adobe and the problem persisted.

* I reinstalled adobe reader software, but also a previous version of adobe and the problem persisted.

* The application doesn't have any problem asking other files opened, only those associated with adobe reader on this same machine. The problem does not exist on other machines.

That about sums up the problem. Any suggestion would be appreciated.

Thank you


It was determined that the version of adobe reader was at fault.

Tags: Windows

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