On Thu, 12 Feb 2004, Rick Dempster wrote:
> Hi,
>
> First question: Am I in the right place. I am trying to write a
> simple X Window program but XFee86 seems to focus on video cards or
> chips. So, if I'm not in the right place please tell me where to go but
> not like my wife does.
>
> If this is the place, I am starting into X Window programming and I
> can't even get the simplest program to run. It compiles and links fine
> but always fails to make the connection to the display manager. I have
> spent 2 days pouring over the internet and trying all sorts of stuff but
> nothing has worked.
>
> I'm running RedHat 9.0 with XFree86 4.3 on an Intel clone. Here is my
> program:
>
> #include <stdio.h>
> #include <X11/X.h>
> #include <X11/Xlib.h>
>
> /*************************MAIN******************************/
> int main(int argc, char *argv[]) {
>
> Display *disp;
> int screen = -1;
>
> //Open the X Windows Display
> disp = XOpenDisplay("localhost:0.");
>
> if (disp == NULL){
> printf("Error opening X Display");
> return(-1);
> }
> screen = DefaultScreen(disp);
> printf("The default screen is: %d \n",screen);
>
> if (disp) {
> XCloseDisplay(disp);
> disp = 0;
> }
> }
>
>
> I have tried (NULL), ("Cody:0"), ("Cody:0.0") and ("Cody:0.1") as args
> to XOpenDisplay. But it never returns any but NULL and I never get what
> the screen number is.
Generally, you pass NULL so it will read the connection from
the DISPLAY environment variable. Most shells have this set to
a reasonable default like ":0.0" .
Mark.
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