Delphi Basics : ParamCount command

DelphiBasics

ParamCount
Function

Gives the number of parameters passed to the current program

System unit

function ParamCount():Integer;

Description

The ParamCount function gives the number of command line parameters used to invoke the current executable.

Notes

The related ParamStr function returns these parameters as index values 1, 2 etc.

Related commands

CmdLine		Holds the execution text used to start the current program
FindCmdLineSwitch		Determine whether a certain parameter switch was passed
ParamStr		Returns one of the parameters used to run the current program

Download this web site as a Windows program.

Example code : Display command line parameters

var
  cmd : string;
  i : Integer;

begin
  // Before running this code, use the Run/parameters menu option
  // to set the following command line parameters : -parm1 -parm2
  cmd := CmdLine;
  ShowMessage(cmd);    // Show the execution command + parameters

  // How many parameters were passed?
  ShowMessage('There are '+IntToStr(ParamCount)+' parameters');

  // Show these parameters - note that the 0th parameter is the
  // execution command on Windows
  for i := 0 to ParamCount do
    ShowMessage('Parameter '+IntToStr(i)+' = '+ParamStr(i));
end;

Show full unit code

  "C:\Program files\Borland\Delphi7\Projects\Project1.exe" -parm1 -parm2
  There are 2 parameters
  Parameter 0 = C:\PROGRAM FILES\BORLAND\DELPHI7\PROJECTS\PROJECT1.EXE
  Parameter 1 = -parm1
  Parameter 2 = -parm2