关于WinSCP错误判定机制及错误级别检测的技术问询

Let me break this down clearly based on how WinSCP works and common scripting scenarios:

Does WinSCP detect error levels from log files? #

WinSCP doesn’t rely on parsing log files to determine error levels. Instead, it directly sets the exit code (errorlevel) for the process based on the outcome of operations, which your BAT script can check. However, there are edge cases where this behavior might not align with what you’d expect—like the "no files match" scenario you mentioned.

How does WinSCP determine errors? #

WinSCP uses exit codes to signal success or failure:

• Exit code 0 means the operation completed successfully (no errors encountered).
• Non-zero exit codes indicate failures, with specific codes mapping to different error types (like code 3 for "No such file or directory", which you saw with the put command).

The key gotcha here: some scenarios that feel like "errors" (like no files matching a wildcard in get) don’t trigger a non-zero exit code by default. WinSCP considers these non-fatal conditions rather than errors, because the command itself executed without unexpected failures—it just didn’t find any files to act on.

What counts as an error for WinSCP? #

WinSCP treats the following as errors (triggering non-zero exit codes):

• Failed file transfers (e.g., trying to upload a file that doesn’t exist with put eslam.txt).
• Connection issues (can’t reach the server, invalid credentials).
• Permission errors (trying to write to a directory you don’t have access to).
• Invalid commands or syntax mistakes.
• Unexpected failures during operations (like a server disconnect mid-transfer).

On the other hand, these are not considered errors (exit code 0):

• Wildcard patterns that match no files (e.g., get eslam* when no files start with "eslam").
• Successful operations where no files were modified/transferred (like a sync that finds no changes).

Your Test Scenarios Explained #

Let’s walk through the cases you tested:

1. get eslam* with no matching files:
   WinSCP logs "no files match" but returns exit code 0. This is intentional—WinSCP doesn’t see this as a failure, just an empty result set.
2. put eslam.txt when the file doesn’t exist:
   This triggers exit code 3 (No such file or directory) because the command can’t even start the transfer—the source file is missing, which is a genuine error.

Fixing BAT Script Misjudgments #

If you want your BAT script to treat "no files match" as an error, you’ll need to parse the WinSCP log output alongside checking the exit code. For example:

1. Redirect WinSCP’s output to a log file:

   winscp.com /script=your_script.txt /log=transfer.log
   

2. In your BAT script, check both the exit code and the log for "no files match":

   findstr /i "no files match" transfer.log >nul
   if %errorlevel% equ 0 (
       echo No files matched the pattern—treating as error
       exit /b 1
   )
   

This way, you can override WinSCP’s default behavior and flag empty wildcard matches as errors in your script.

内容的提问来源于stack exchange，提问作者Eslam Amin