Error Messages/49963


Error message

The first word of «cmdLine» (--version) does not appear to name the
«program» being launched (C:\Python313\python.exe). The new process
receives «cmdLine» as its complete command line and treats the first
word as its own program name (argv[0]), not as an argument. Either
repeat the program name at the start of «cmdLine», e.g.
cmdLine: 'python --version', or omit «program» and pass the entire
command line in «cmdLine».

Description

This warning (it is a warning, not an error — the process is still launched exactly as you specified) appears when you call RunConsoleProcess with both the «program» and «cmdLine» parameters, and the first word of «cmdLine» does not appear to name the executable given in «program». The example message above results from:

RunConsoleProcess('C:\Python313\python.exe', '--version')

This call looks reasonable, but it does not run python --version. By Windows convention, a newly launched process receives a single command-line string, and the first word of that string is the program's own name (argv[0] in C parlance); the real arguments begin at the second word. RunConsoleProcess passes «cmdLine» to the new process as its complete command line, so in this example python sees --version as its own program name and concludes that it was given no arguments at all. Rather than printing its version, python behaves as if launched bare: it reads a script from standard input (the «stdIn» parameter — empty here), runs it, and exits. The net effect is that the call returns empty text, with no other indication of what went wrong.

To fix the call, do either of the following:

  • Repeat the program name as the first word of «cmdLine». It does not have to be the full path — the bare name is enough:
    RunConsoleProcess('C:\Python313\python.exe', 'python --version')
  • Or pass the entire command line as a single parameter, and let Analytica locate the executable (quote the path if it contains spaces):
    RunConsoleProcess('"C:\Python313\python.exe" --version')

The check that triggers this warning is forgiving about form: the first word of «cmdLine» may be a bare name or a full path, quoted or unquoted, with or without the .exe extension, in any letter case. The warning is issued only when, after reducing both sides to a bare program name, they still differ.

In the rare case where the mismatch is deliberate — a few programs intentionally inspect argv[0] and vary their behavior based on the name they were invoked under — you can simply ignore the warning, or suppress it like any other warning. The process is launched with exactly the «program» and «cmdLine» you gave.

This warning was added in Analytica 7.1.

See Also

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