Hello,
As u suggested I tried following code in RedHat7.1.
But it shows
"The framebuffer device was opened successfully."
"Error reading fixed information."
What could be the problem?
I am new to this.
Thank you,
Abhilash.
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <sys/mman.h>
int main()
{
int fbfd =3D 0;
struct fb_var_screeninfo vinfo;
struct fb_fix_screeninfo finfo;
long int screensize =3D 0;
char *fbp =3D 0;
int x =3D 0, y =3D 0;
long int location =3D 0;
// Open the file for reading and writing
fbfd =3D open("/dev/fb0", O_RDWR);
if (!fbfd) {
printf("Error: cannot open framebuffer device.\n");
exit(1);
}
printf("The framebuffer device was opened successfully.\n");
// Get fixed screen information
if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)) {
printf("Error reading fixed information.\n");
exit(2);
}
}
----- Original Message -----
From: "Geert Uytterhoeven" <ge...@li...>
To: "Abhilash" <abh...@av...>
Cc: "Linux Frame Buffer Device Development"
<lin...@li...>
Sent: Friday, December 27, 2002 5:03 PM
Subject: Re: [Linux-fbdev-devel] Screen Capturing
> On Fri, 27 Dec 2002, Abhilash wrote:
> > I need to capture the screen .For that I use mirror driver in
Windows
for
> > capturing screen.
> > ie, its basically overloading the driver functions.
> >
> > So in case of Linux, is there any method like this or which is the
best
> > method?
> > In Xlib there are some functions to capture screen and also heard
abt
VESA
> > which is better?
>
> If you are using a frame buffer device, you can capture the contents
of
> /dev/fb*. Either read from /dev/fb*, or mmap() it. The data you
receive
are in
> the native format of the graphics chip. For CLUT modes, you have to
use an
> ioctl() to get the colormap.
>
> Gr{oetje,eeting}s,
>
> Geert
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