C2668 - Ambiguous Call to Overloaded Function

This is a discussion on C2668 - Ambiguous Call to Overloaded Function within the C++ Programming forums, part of the General Programming Boards category; I have a problem with my code, and I need some help... I'm doing some testing with DirectX8 and I'm ...

  1. #1
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    C2668 - Ambiguous Call to Overloaded Function

    I have a problem with my code, and I need some help... I'm doing some testing with DirectX8 and I'm trying to use sin() and cos() to assist me(yes, I have math.h included), but when I do, I get a C2668(error referenced in thread title). The code in question is below... Can someone help me?

    Code:
    	int iX, iY;
    	for(iY = 0; iY < 256; iY++) {
    		for(iX = 0; iX < 256; iX++) {
    			int iPower = (int)(sin(iX * iY) * 128 + cos(iX * iY) * 128);
    			piSurfaceBuffer[iX + iY* (kLockedRect.Pitch >> 2)] = D3DCOLOR_XRGB(iPower, iPower, iPower);
    		}
    	}

  2. #2
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    Oh, right. I forgot to tell which functions are generating the error. lol It's sin() and cos()... Which is what makes it so damn confusing.

  3. #3
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    are you using stl and using namespace std globally? Try casting:

    Code:
     
    sin((double)iX * iY);
    
    or just:
    
    ::sin(iX * iY);

  4. #4
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    The first one got it, thanks. =) But now I'm getting a runtime error... =/

    Code:
    Unhandled exception at 0x6d9ee684 in game_prog_2.exe: 0xC0000005: Access violation reading location 0x00000000.
    And then when I break it off, this is the line of code it points me to as having generated that error:

    Code:
    m_pD3DDevice->CopyRects(m_pD3DSurface, NULL, 0, pBackBuffer, NULL);
    Any ideas?

  5. #5
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    I don't understand what you are doing, You are trying to read 0 bytes from a NULL pointer and write to a buffer given a NULL position? Whatever the problem is, it involves a NULL pointer since the access error is given at location 0x00000000. It could be that CopyRects does not allow a source pointer to be NULL even if the byte size is 0, it also could be that m_pD3DDevice is NULL, and it could be that you can't give it a NULL parameter for the last parameter either. pBackBuffer should be ok since that's a write and this error is on a read.

  6. #6
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    I narrowed it down to a problematic function:

    Code:
    m_pD3DDevice-&gt;CreateImageSurface(256, 256, (D3DFORMAT) m_iD3DFormat, &m_pD3DSurface)
    It assigns a memory value of 00000000 to m_pD3DSurface and the function fails... Any ideas as to how to fix it?

  7. #7
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    make sure that your D3DFORMAT structure is properly initialized, also check the return value of the function

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