How to look for and handle command line parameters
Most command line programs and some Windows programs has the ability to look for and handle parameters passed to it such as "/? /HELP /Q". If you want to add similar functionality to your Delphi programs, you can start with a function like this:
program myprog;
uses
SysUtils;
function CmdLineParamFound(
sParamName : String ) : Boolean;
const
{ assume that command line parameters
start with the "/" character }
c_token = '/';
var
i : integer;
sTemp : string;
begin
result := False;
for i := 1 to ParamCount do
begin
sTemp := ParamStr( i );
if( c_token = sTemp[ 1 ] )then
begin
if( ( c_token +
UpperCase( sParamName ) ) =
UpperCase( sTemp ) )then
begin
result := True;
exit;
end;
end;
end;
end;
begin
{
following "if" statement will be triggered
if called with the /HELP parameter:
myprog.exe /HELP
}
if( CmdLineParamFound( 'HELP' ) )then
begin
{
display help here...
}
end;
{
myprog.exe /FULLSCREEN
}
if( CmdLineParamFound( 'FULLSCREEN' ) )then
begin
{
run program in full screen mode
}
end;
end.
Listing #1 : Delphi code. Download
cmdline (0.58 KB).
If you need more help, look up "ParamStr()" and "ParamCount" functions in your help files.
Applicable Keywords : Delphi, Delphi 1.x, Delphi 2.x, Delphi 3.x, Functions, Source Code