X Error of failed request: BadMatch

piccir · 03-15-2010, 10:58 PM

I'm working on a old piece of code on linux, after compiling without porblem at the execution I have this response:

src/xproject/xproject: Ok, a color display! :-)
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 78 (X_CreateColormap)
Serial number of failed request: 7
Current serial number in output stream: 15

looking at the source code I think the problem is related at the depth of my system 24 bit and the depth of this old piece of code 8 bit.
Unfortunately also I don't have experience in programming the XVideo and if someone can give me some help in programming the XVideo interface
Thank you

Piccir

grail · 03-29-2010, 09:50 PM

Without seeing any code it will be rather tough to help??

piccir · 03-29-2010, 11:33 PM

Quote:

Originally Posted by grail

Without seeing any code it will be rather tough to help??

This is the part:

#ifdef X
static void projection_examine_visual(p)
Projection *p;
{
p->depth = DefaultDepth(p->display, p->screen);

if (p->depth < 8) {
/* It's monochrome display... to bad

*/
p->color_count = 0;
p->visual = DefaultVisual(p->display, p->screen);
p->colormap = DefaultColormap(p->display, p->screen);
p->black = BlackPixel(p->display, p->screen);
p->white = WhitePixel(p->display, p->screen);
info("Tough luck: monochrome...\n");
} else {
int i;
XColor *xcolor = (XColor *)alloca(256 * sizeof(XColor));

p->visual = DefaultVisual(p->display, p->screen);

/* Ok, try to allocate a 256 colors palette... */
p->color_count = 256;
p->colormap = XCreateColormap(p->display, p->parent, p->visual, AllocAll);
for (i = 0; i < p->color_count; i++) {
xcolor[i].pixel = i;
xcolor[i].red =
xcolor[i].green =
xcolor[i].blue =
(unsigned) i * 256;
xcolor[i].flags = DoRed | DoGreen | DoBlue;
}
XStoreColors(p->display, p->colormap, xcolor, p->color_count);
p->black = 0;
p->white = p->color_count - 1;
info("Ok, a color display! :-)\n");
}
}

For now I forced to use the bw mode, but in color mode doesn't work, always the same error

piccir

grail · 03-30-2010, 04:43 AM

Firstly, you found the QUOTE tags which is good, there are also CODE tags which will keep formatting and
make the code easier to read (above is very difficult)

Secondly, if I am reading the above correctly, your output:

Quote:

src/xproject/xproject: Ok, a color display! :-)

Says that it successfully got to the end of the code you have shown, ie

Code:

info("Ok, a color display! :-)\n")

This would lead me to think that whatever called:

Code:

static void projection_examine_visual(p)

Is where we need to see as the next line after this call would seem to be the issue

piccir · 04-02-2010, 10:05 AM

I used gdb and I found where my program crash:

Quote:

531 projection_create_x_window(projection[0], display, screen, root);
532 projection_count = 1;
533
534 if (pgmfile) projection_set_background(projection[0], background[0]);
535 }
536
537 int main(argc, argv)
538 int argc;
539 char **argv;
540 {

and the function I think is projection_create_x_window

Quote:

void projection_create_x_window(p,dpy,scr,prnt)
Projection *p;
Display *dpy;
int scr;
Window prnt;
{
XSetWindowAttributes attributes;
long valuemask;
XSizeHints hints;

p->has_x_window = 1;

p->display = dpy;
p->screen = scr;
p->parent = prnt;

projection_examine_visual(p);

p->gc = DefaultGC(p->display, p->screen);
XSetBackground(p->display, p->gc, (ULONG) p->black);

attributes.event_mask = event_mask;
attributes.background_pixel = p->black;
attributes.colormap = p->colormap;
valuemask = CWEventMask | CWBackPixel | CWColormap;

p->window = XCreateWindow(p->display, p->parent, -1, -1,
(ULONG)p->width, (ULONG)p->height, 1, p->depth,
InputOutput, p->visual,
(ULONG)valuemask, &attributes);

hints.flags = PSize | PMinSize | PMaxSize;
hints.width = hints.min_width = hints.max_width = p->width;
hints.height = hints.min_height = hints.max_height = p->height;

XSetStandardProperties(p->display, p->window,
"Projection", "Projection",
None, NULL, 0, &hints);

p->pixmap = XCreatePixmap(p->display, p->window, (ULONG)p->width, (ULONG)p->height, (ULONG)p->depth);

if (p->background) {
int x = 0, y = 0, w, h, sx = 0, sy = 0;
p->background_pixmap = XCreatePixmap(p->display, p->window, (ULONG)p->width,
(ULONG)p->height, (ULONG)p->depth);
XSetForeground(p->display, p->gc, (ULONG)p->black);
XFillRectangle(p->display, p->background_pixmap, p->gc, 0, 0, (ULONG)p->width, (ULONG)p->height);
if (p->bg_x_ofs <= 0) sx = - p->bg_x_ofs;
else x = p->bg_x_ofs;
if (p->bg_y_ofs <= 0) sy = - p->bg_y_ofs;
else y = p->bg_y_ofs;
if (x + p->background->width - sx > p->width) w = p->width - x;
else w = p->background->width - sx;
if (y + p->background->height - sy > p->height) h = p->height - y;
else h = p->background->height - sy;
projection_x_put_image(p, p->background_pixmap, p->background, x, y, w, h, sx, sy);
}

XMapWindow(p->display, p->window);

projection_reset(p);
}
#endif

Do you think is here the problem??
Thank you
piccir

Where's the code tag button?

grail · 04-02-2010, 10:47 AM

Ok ... so first, the CODE tags are right next to the QUOTE tags, its the one with a # on it.

Secondly, without pouring through your code line by line and based on the error message,
I would guess two of the culprits might be:

Quote:

valuemask = CWEventMask | CWBackPixel | CWColormap;

hints.flags = PSize | PMinSize | PMaxSize;

Both seem to be setting some attributes / flags so could be the issue.

If not I would suggest looking at each line that takes parameters into functions and confirming
they have a) the right number of arguments and b) the correct arguments.