Self-upgrading mechansim
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Self-upgrading mechansim
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| When the AutoUpgrader downloads required files from the Web it stores them to the working directory with "*.*.uTMP" extensions. It also set for them "temporary" and "hidden" attributes, so user will not see these files.
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| After successful downloading, the AutoUpgrader extracts so-called self-upgrading module (Upgrader3.exe, 9KB), which performs local updates to the TEMP directory, execute it then terminate the main app itself. The self-upgrading mechanism replaces all files with newer ones and restart the main application.
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| The self-upgrading module (Upgrader3.exe) performs the local updates with following steps:
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| 1. Locate program directory by exe-name transmitted as command-line parameter
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| 1.1. Check whether the AutoUpgrader uses the external setup program (#method=1)
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| 1.2. Split the file name and parameters
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| 1.3. Split the file name and path
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| 2. Test whether an exe-file exists + get the filename with correct charcase
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| 3. Awaiting for termination of the main program
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| 4. Test whether newer (downloaded) exe-file exists
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| 5. Find all downloaded (.uTMP) files
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| 5.1. If this is executable AND newest exe still not found -- trying to
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| use another suitable EXE. (This may happends if program was renamed
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| by user, or local update should be done by external setup.)
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| 5.2. Rename .uTMP file to its normal name
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| 6. Re-execute main program (or setup file).
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| New steps, added in v3.1.1:
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| 7. IF the local update should be done by external setup THEN (else terminate)
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| 7.1. Wait until termination of setup program
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| 7.2. Delete the setup (we don't need it anymore after installation?)
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| 7.3. Restart the original main app
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 If you wish to use AutoUpgrader for downloading just single setup-file which will perform all further updates — make sure that UpgradeMethod = umUseExternalSetup (#method=1 in the Info-file). Otherwise the self-upgrading module will replace your program with downloaded setup.
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