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Asked: 2026-05-11T12:24:47+00:00

Can anyone see what’s wrong with this code? SIZE_BG is 6MB as I am

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Can anyone see what’s wrong with this code?

SIZE_BG is 6MB as I am trying to draw a large bitmap image (3366×600). I use malloc to prevent my image from overflowing the stack. I get an access violation error on the call to glDrawPixels(). bgPtr seems to point to the correct data as I checked the first few bytes before calling glDrawPixels and they are correct.

    bgPtr = (char*)malloc(SIZE_BG);     fstream inFile(texFileName, ios::in | ios::binary);     inFile.read(bgPtr, SIZE_BG);     inFile.close();  //... other code      glDrawPixels(3366, 600, GL_BGRA_EXT, GL_UNSIGNED_BYTE, bgPtr+54);
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1 Answer

  1. SIZE_BG is 6MB

    3366 × 600 is approximately 1.92 million pixels
    BRGA indicates 4 bytes per pixel
    so, 3366 × 600 × 4 is just over 7.7MB

    Therefore, your buffer is too small… glDrawPixels() will read past the end into unallocated memory.

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