C Help

**[SomeGuy]** · 08-03-2008 03:57 AM

Code:

#include <stdio.h>   
#include <string.h>   


void strip_newline( char *str, int size )
{
    int i;

    for (  i = 0; i < size; ++i )
    {
        if ( str[i] == '\n' )
        {
            str[i] = '\0';
            return;   
        }
    }
}

int main()
{
    char command[100];
    FILE *fp;

    printf( "Select Program\n" );
    fgets( command, 100, stdin );

    strip_newline( command, 100 );
    
    if ( strcmp ( command, "Programmer's Notepad" ) == 0)                               
    {
        fp=fopen("Apps/PN/pn.exe", "r");
    }
    fgets( command, 100, stdin );
    strip_newline( command, 100 );
    getchar();
    return 0;
}

Can somebody help me wit this? I want it so when you type "Programmer's Notepad", it opens Programmer's Notepad from a folder called apps.

[Project Folder]
Project.exe
[Apps]
[PN]
pn.exe

That's My file setup.

**Ynot** · 08-03-2008 09:58 AM

currently, you are just opening the external binary file for reading
what you need is for the operating system to execute the program

one way is the system() function

If you use system() to execute an external program,
you will lose all control over your program until the external program finishes
(your program will just sit there, waiting)
there are more elegant ways to execute external programs, and keep control
but because you're dealing with OS specific things, it gets complicated, fast

examples
http://www.cprogramming.com/tips/sho...ount=30&page=1

http://www.gidforums.com/t-3369.html

just be careful with system()
search and read up on it
understand the problems, and why people advise against it's use

**Replicon** · 08-03-2008 05:52 PM

*wonders why anyone would want to type "Programmer's Notepad" instead of just "pn"*

**[SomeGuy]** · 08-10-2008 09:01 AM

Okay, I will look into that. Also, how do I make it so it never really ends? Most programms I van write go along a timeline, and it ends. I know how to make it stop with getchar(),but that doesn;t really help. How would I make this more like a terminal? So where it stays open and allows peope tocontinuously write commands?

Also, I don't really want to get into C right now,I just need to make a terminal like app in this as a quick project for some stuff.

**Replicon** · 08-10-2008 04:08 PM

Originally Posted by xXSomeGuyXx

Okay, I will look into that. Also, how do I make it so it never really ends? Most programms I van write go along a timeline, and it ends. I know how to make it stop with getchar(),but that doesn;t really help. How would I make this more like a terminal? So where it stays open and allows peope tocontinuously write commands?

Also, I don't really want to get into C right now,I just need to make a terminal like app in this as a quick project for some stuff.

If you want it to be like a terminal, you can always put the getchar inside a loop... something like

Code:

    bool done = false;
    while( !done ) {
        fgets( command, 100, stdin );
        done = processCommand( command );
    }

Of course, you don't have 'bool' if you're using a C compiler...

**[SomeGuy]** · 08-11-2008 05:23 AM

Yeah, but then it doesn't read the if statements everytime.

**Replicon** · 08-12-2008 03:22 PM

Errm... I was assuming the if statement, and whatever else you want to do, lives inside processCommand....

**[SomeGuy]** · 08-26-2008 07:15 AM

Oh right...

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