GetObject with empty buffer

[Fabian Cenedese]

Hello

I think I found my (or better a :) problem with fonts. The function GetObject

<MSDN>
int GetObject(
   HGDIOBJ hgdiobj,  // handle to graphics object
   int cbBuffer,     // size of buffer for object information
   LPVOID lpvObject  // buffer for object information
);
</MSDN>

should either return the info in the object buffer or, if this pointer is 
zero, just
the size the required info would need.

<MSDN>
If the lpvObject parameter is NULL, the function return value is the number 
of bytes required to store the information it writes to the buffer for the 
specified graphics object.
</MSDN>

But I couldn't find this anywhere, not in the general function in gdiobj.c nor
in the subtypes FONT_GetObject or BRUSH_GetObject (sure others neither).
As my app uses this feature Wine tries to memcpy to a NULL pointer and
jumps out of the window... literally :)

bye  Fabi

[Uwe Bonnes]

> > > > > "Fabian" == Fabian Cenedese <Cenedese(a)indel.ch> writes:

...

    Fabian> <MSDN> If the lpvObject parameter is NULL, the function return
    Fabian> value is the number of bytes required to store the information
    Fabian> it writes to the buffer for the specified graphics object.
    Fabian> </MSDN>

    Fabian> But I couldn't find this anywhere, not in the general function
    Fabian> in gdiobj.c nor in the subtypes FONT_GetObject or
    Fabian> BRUSH_GetObject (sure others neither).  As my app uses this
    Fabian> feature Wine tries to memcpy to a NULL pointer and jumps out of
    Fabian> the window... literally :)


FONT_GetObject sure checks:

    if(buffer)
        memcpy( buffer, &lfA, count );
    return count;

BRUSH_GetObject  does not:

    if (count > sizeof(brush->logbrush)) count = sizeof(brush->logbrush);
    memcpy( buffer, &brush->logbrush, count );
    return count;

Someone has to carefully check all subtypes...

Bye
-- 
Uwe Bonnes                bon(a)elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
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