> > That actually happened but I ended up doing this before the form is
> > loaded so it works if I simply delete a bitmap resource and copy
> > another into its place.
>
> so, it was an issue at one point :)
Sort of.
> i am not sure what this problem may be then - maybe more sample code or
> doing a little demo to demonstrate the issue (in full) is at order to
> get more investigation in place.
Here is some test code that I run before the form is drawn.
static void Fred2(void)
{
BitmapPtr pBitmap;
WinHandle hWin;
WinHandle hScreen;
Err error;
// RectangleType onScreenRect;
pBitmap = BmpCreate(30, 30, 8, NULL, &error);
if(pBitmap) {
hWin = WinCreateBitmapWindow(pBitmap, &error);
if(hWin) {
hScreen = WinSetDrawWindow(hWin);
WinSetForeColor(113); // some sort of red
WinDrawLine(0, 0, 10, 10);
WinSetDrawWindow(hScreen);
WinDeleteWindow(hWin, false);
}
}
WinDrawBitmap(pBitmap, 0, 0); // bitmap actually shows up on the screen
SysFatalAlert("wait to view bitmap");
Fred3(pBitmap);
BmpDelete(pBitmap);
}
static void Fred3(BitmapPtr pCreatedBitmap)
{
DmOpenRef dbApp;
UInt16 index;
MemHandle hRes;
UInt32 createdBitmapSize;
MemHandle hNewBitmap;
BitmapPtr pNewBitmap;
Err err;
// open application database
dbApp = DmOpenDatabaseByTypeCreator(APP_TYPE, APP_ID, dmModeReadWrite);
// find and delete existing bitmap resource
hRes = DmGet1Resource(bitmapRsc, bitmapID_colors);
if(hRes) {
index = DmFindResource(dbApp, bitmapRsc, bitmapID_colors, hRes);
DmRemoveResource(dbApp, index);
}
// create new bitmap resource
BmpGetSizes(pCreatedBitmap, &createdBitmapSize, NULL);
hNewBitmap = DmNewResource(dbApp, bitmapRsc, bitmapID_colors,
createdBitmapSize);
pNewBitmap = MemHandleLock(hNewBitmap);
err = DmWrite(pNewBitmap, 0, BmpGetBits(pCreatedBitmap), createdBitmapSize);
if(err != 0)
SysFatalAlert("ERROR");
MemHandleUnlock(hNewBitmap);
DmReleaseResource(hNewBitmap);
// close application database
DmCloseDatabase(dbApp);
}
> i'm sure you'll figure it out and let us all know ;)
Yep.
> PS: any reason why you are not drawing the bitmap manually? :)
> that is what i would have done (after driving myself mad)
Yes. My application displays a large number of colors and whenever the form
needs to be updated it has to for a FrmDrawForm. That will make the screen
blink. I figured that I could avoid the screen blink by using this resource
technique. Also, I just want to know how to do it.
It looks as if I am real close. I'm guessing that the following lines from
Fred3() may be the problem:
BmpGetSizes(pCreatedBitmap, &createdBitmapSize, NULL);
hNewBitmap = DmNewResource(dbApp, bitmapRsc, bitmapID_colors,
createdBitmapSize);
pNewBitmap = MemHandleLock(hNewBitmap);
err = DmWrite(pNewBitmap, 0, BmpGetBits(pCreatedBitmap), createdBitmapSize);
Thanks,
Mike
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