no-reply@allegro.cc (Ma AnSheng) — Wed, 26 Jul 2006 06:40:52 +0000

I want to display a image in the screen,so I do this:

1static void operation_menu(void *data nouse)
2{
3   MkMenuItem(0, "Open", "Ctrl-O", openwi, NULL);
4   MkMenuItem(0, "Quit", "Ctrl-Q", quit, NULL);
5}
6 
7int main(void)
8{
9   PALLETE pal;
10   BITMAP *bj;
11   char buff[200]="..\\examples\\bj.bmp";
12   InitCgui(1024,768, 16);
13   if((bj=load_bmp(buff,pal))==NULL)
14       Req("Information","Cannot Load Background Bitmap|~Aborat");
15   else
16     blit(bj,screen,0,0,0,0,bj->w,bj->h);
17   MkDialogue(800,600, "Information",W_NOMOVE|W_CENTRE);
18   MkSingleMenu(TOPLEFT, "Operation", operation_menu, NULL);
19   AddButton(TOPLEFT, "\33E~xit", quit, NULL);
20   DisplayWin();
21   ProcessEvents();
22   return 0;
23}
24END_OF_MAIN();

In the beginning,it can display correctly,but when I click the menu the image disappear.How can make it not disappear?

no-reply@allegro.cc (GullRaDriel) — Wed, 26 Jul 2006 13:45:09 +0000

From which version of allegro did you got those functions ?

Tell us more about:

MkMenuItem(...);
InitCgui(...);
MkDialogue(...);
MkSingleMenu(...);
AddButton(...);
DisplayWin(...);
ProcessEvents(...);

Please also give us:

Your allegro version
The compiler you use
The OS you target

You can also attach your full source code, in the case someone have enough time to read them.

1	static void operation_menu(void *data nouse)
2	{
3	MkMenuItem(0, "Open", "Ctrl-O", openwi, NULL);
4	MkMenuItem(0, "Quit", "Ctrl-Q", quit, NULL);
5	}
6
7	int main(void)
8	{
9	PALLETE pal;
10	BITMAP *bj;
11	char buff[200]="..\\examples\\bj.bmp";
12	InitCgui(1024,768, 16);
13	if((bj=load_bmp(buff,pal))==NULL)
14	Req("Information","Cannot Load Background Bitmap\|~Aborat");
15	else
16	blit(bj,screen,0,0,0,0,bj->w,bj->h);
17	MkDialogue(800,600, "Information",W_NOMOVE\|W_CENTRE);
18	MkSingleMenu(TOPLEFT, "Operation", operation_menu, NULL);
19	AddButton(TOPLEFT, "\33E~xit", quit, NULL);
20	DisplayWin();
21	ProcessEvents();
22	return 0;
23	}
24	END_OF_MAIN();

display image using allegro cgui