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Method and system for verifying and storing documents during a program failure
| Details |
Inventors: Snyder, Eric; Larsson, Jeff; Coffen, Bob; Fischer, Kevin; Slepak, Aleksandr; Niemisto, Juha;
Assignee: Microsoft Corporation (Redmond, WA)
Primary Examiner: Le; Dieu-Minh
Assistant Examiner:
Attorney, Agent or Firm: Merchant & Gould
Method and system for verifying and storing documents during a failure in a program module. Once a failure is detected in the program module, control passes to an exception handler that determines whether the open files have been modified. If so, a crash handler is executed, which verifies and stores the documents by detecting and repairing any discovered corruption. The program module is then terminated and restarted. Upon restarting the program module, the repaired document is opened and displayed to the user with a list of repairs. |
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DETAILED DESCRIPTION The present invention satisfies the above-described needs by providing a method and system for verifying and storing documents during a program failure.
A crash handler is provided that verifies and performs an emergency save of any file that is open at the time of the crash.
Once a failure of the program module is detected, control passes to an exception handler, which instructs the operating system to execute the crash handler.
The crash handler attempts to repair and store all open files that have been modified.
When the program is restarted, the repaired files are loaded and displayed to the user with a list of any repairs.
More particularly, once a failure occurs in an application program module, the operating system passes control to the exception handler, which may display a user interface, such as a dialog box, asking the user whether any open files should be saved.
If the user selects to save the open files, then a determination is made whether the open file has been modified from the version currently saved to disk.
If so, the exception handler instructs the operating system to execute the crash handler.
After assuming control, the crash handler examines each file for evidence of corruption.
The term corruption is used generally to include any type of error ranging from missing end-of-file markers and illegal names for sheets or ranges, to missing PivotTable report supporting records or corrupt OLE storage structures.
If corruption is found, the crash handler determines whether the errors are repairable.
Repairs may include making changes to the file such as renaming sheets or removing parts of the file that contain the errors.
The extent of information recovered by the crash handler depends on the extent the file could be repaired.
For example, in accordance with one embodiment of the present invention, if it is determined that the file is so badly damaged that it can not be repaired, the crash handler may not attempt to save the file at all.
If, on the other hand, it is determined that the file is not corrupt or that be saved normally, i
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Cell Phones 
