Run-Time Debug Error: "DAMAGE: after Normal block.... "

[zer0FX]

Hello,

I am getting a run-time debug error of the following type:

DAMAGE: after Normal block (#XXX) at 0xXXXXXXXX

It seems to be related to the KB article Q172398 - BUG: Debug Assertion When Assigning to STL string. However, I cannot use this fix as I am not using strings, but a buffer of characters, so I cannot call strvar.erase(). Here is the code that eventually causes the error:

if (GetClientRect(appGetWnd(), &lpRect))
{
width = lpRect.right - lpRect.left;
height = lpRect.bottom - lpRect.top;

acBuffer = (unsigned char *) malloc(width*height*PIXEL_COMPONENTS);

ScreenShot(0, 0, width, height, GL_BGR_EXT, GL_UNSIGNED_BYTE, acBuffer);
WriteTGA("Screenshot.tga", width, height, acBuffer);

free(acBuffer);
}

You can see that the size of the buffer changes whenever the window has been resized.

I have searched through Google and have not found anything that helps me out. Any input as to how to solve this problem would be greatly appreciated.

--zer0FX

 

[palbano]

acBuffer = (unsigned char *) malloc(width*height*PIXEL_COMPONENTS);

ScreenShot(0, 0, width, height, GL_BGR_EXT, GL_UNSIGNED_BYTE, acBuffer);

No idea what PIXEL_COMPONENTS is ?
No idea what ScreenShot() is ?



-pete
_{I just can't seem to get back my IntelliSense}

 

[JOLESEN]

Just a wild guess :

Could it be that witdth = right - left + 1 ? (And height = bottom - top + 1)

/JOlesen

 

[LazyMe]

You might wnat to debug your code to see if nothing gets written beyond the allocated block of memory. I've never seen any other reason for the error you're getting (and it probably does this when freeing the block).....


Greetings,
Rick

 

[zer0FX]

In response to palbano, to clarify some of the code:

PIXEL_COMPONENTS = 3 (I am reading an R, G, and B component from each pixel.

ScreenShot() is a wrapper function that for the moment is calling glReadPixels() directly with the same parameters.

......

I found out what the problem was, I had not set the PACK_ALIGNMENT parameter properly for the glReadPixels so the function was overwriting its bounds.

zer0FX