CODEWITHSUNDEEP
delphicommand-line-arguments
iluwatar
iluwatar

Reputation: 1803

Maximum length of command line arguments passed to Delphi console application

Is there a maximum limit how long strings can be passed to Delphi console application? I am thinking of passing in a lots of JSON data. I would read the data in with ParamStr(x) function.

Upvotes: 6

Views: 2889

Answers (3)

mjn
mjn

Reputation: 36654

For 'lots of data', using ParamStr could be too limited. Have you considered to use an (anonymous) pipe? Here is a starting point:

Start two processes and connect them with a pipe in Delphi

Upvotes: 1

Ken White
Ken White

Reputation: 125688

The max length for CMD.EXE is 8192 characters. This would be the max amount receivable by a Delphi console app because of a limitation in CMD.EXE itself.

The max command length for CreateProcess is 32767 characters. This is due to the UNICODE_STRING structure.

ShellExecute/EX is limited to the INTERNET_MAX_URL_LENGTH, which as Gamecat mentioned is 2047 characters, unless you're running on Win95; there the limit is only MAX_PATH.

For more info, see Raymond Chen's blog post

Upvotes: 12

Toon Krijthe
Toon Krijthe

Reputation: 53366

The commandline is limited by the OS to 2047 characters.

If you want to use more data, you can use a file.

Upvotes: 8

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