Passing Parameters From Command Line

[CaptainChainsaw]

Hi, I'm wanting to pass a value such as 3 to my program when I run it from the command prompt. How can I do this? Everything I try just either doesn't work or gives me errors

Basically I have a menu screen and when I type the number 3 for example:

C:\>Myprogram.exe 3

I want it to pass the value 3 in to my program and automatically select the 3rd element in the menu.

At the momemt all its doing is running the program and displaying the menu.

Any ideas?

Here is what I have so far:

void main(int argc, char *argv[])

// Additional arguments to enable running of the program from the //DOS prompt

{

int menunumber=(int)argv[1];

// etc etc...

Cheers

CaptainChainsaw

[riis]

You should use the function atoi from stdlib.h, to read the menu number.
int menunumber = atoi(argv[1]);

[CaptainChainsaw]

Hi there riis, I tried that code you posted - thank you. I got my program going from the command prompt and it passed the value as it should do, although to get it working I had to comment out a line which said cin >> menunumber; . When I tried to run the program in the development environment ( Visual C++ 6 ) the program just hangs. I assume this is because the program expects a value to be passed as a string from the command prompt and when it doesn't get a value it can't assign anything to the variable 'menunumber'.

Is there a way of saying something like:

IF no value has been passed via the command prompt then menunumber=0; and read the number from the keyboard the value the user inputs ??

How also can I get the program to ignore the cin >> menunumber; statement when passing a value via the command prompt?

This would enable my program to work both from the command prompt and the development environment would it?


Cheers

CaptainChainsaw

[CornedBee]

The argument named argc is the number of arguments passed to the app. It is always at least 1 (the program name itself), so you can test if it is greater than 1 and if yes, get the item number. Else get input from the user.