Question

I m following this tutorial http://www.gamedev.net/page/resources/_/technical/game-programming/how-to-load-a-bitmap-r1966 and I got the problem of wrong value for all the bitmap header/info that I load.

I ve宣布了储存光标头的结构。

typedef struct BITMAPFILE_HEADER {
  WORD  bfType;
  DWORD   bfSize;
  WORD  bfReserved1;
  WORD  bfReserved2;
  DWORD   bfOffBits;
} BITMAPFILE_HEADER;

//Bitmap information header
//provides information specific to the image data
typedef struct BITMAPINFO_HEADER{
  DWORD  biSize;
  LONG   biWidth;
  LONG   biHeight;
  WORD   biPlanes;
  WORD   biBitCount;
  DWORD  biCompression;
  DWORD  biSizeImage;
  LONG   biXPelsPerMeter;
  LONG   biYPelsPerMeter;
  DWORD  biClrUsed;
  DWORD  biClrImportant;
} BITMAPINFO_HEADER;

//Colour palette
typedef struct RGB_QUAD {
  BYTE  rgbBlue;
  BYTE  rgbGreen;
  BYTE  rgbRed;
  BYTE  rgbReserved;
} RGB_QUAD;

之后,我通过使用以下代码读了比图:

    FILE *in;
    in = fopen("picture.bmp", "rb");

    if (in == NULL)
    {
        printf("Error opening file
");
    }
    else
    {
        BITMAPFILE_HEADER bmfh;
        BITMAPINFO_HEADER bmih;

        fread(&bmfh, sizeof(BITMAPFILE_HEADER), 1, in);
        fread(&bmih, sizeof(BITMAPINFO_HEADER), 1, in);

        if (bmih.biBitCount != 24)
            printf("not 24");
    }

我的情况是24点,但当我管理这一方案时,它显示“不是24点”。我试图在视觉演播室一中进行推测,然后看到<条码>bmih.biBitCount<0>。此外,图像宽度和高度也是错误的,我在头部发现的唯一正确数据是bmfh.bfType。页: 1

Anyone know what s wrong with my codes? Again, I just want to read the bmp but not displaying it.

PS: Originally the picture is in JPEG format. I converted it to BMP format by using MS PAINT and re-save it in BMP format. I wonder does it affect the values?

Answer 1

我想,你会进入alignment issue,因为汇编者可以选择在他认为合适的结构中统一数据。你可以尝试包罗你的脚石,但我建议宣读每一个领域,单独填满,这项工作更多,但更清楚,避免了一致性问题。

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