描述:
我纯C编程，想处理一下BMP图象。我把图象的文件头读入看了看数据。结果BITMAPINFOHEADER结构里的
各个参数的数据都不对了。我用int或long int存储的
比如：
biSize是3558867（书上说是40），
biWidth是2621440，
biHeight是419443040，
biSizeImage是268435456，
biBitCount是65536（书上说是1，2，4，8，16，24中的一个数）
biXpelspermeter是258015246，
biYpelspermeter是256015232
这么数据都这么大，我都没法操作，而且和书上所说的都差很多
请C达人指导一下，为什么会这样啊。先谢啦！
解决方案1:
typedef struct tagBITMAPINFOHEADER{
DWORD biSize;
LONG biWidth;
LONG biHeight;
WORD biPlanes;
WORD biBitCount;
DWORD biCompression;
DWORD biSizeImage;
LONG biXPelsPerMeter;
LONG biYPelsPerMeter;
DWORD biClrUsed;
DWORD biClrImportant;
} BITMAPINFOHEADER, *PBITMAPINFOHEADER;
biSize
Specifies the number of bytes required by the structure.
biWidth
Specifies the width of the bitmap, in pixels.
Windows 98/Me, Windows 2000/XP: If biCompression is BI_JPEG or BI_PNG, the biWidth member specifies the width of the decompressed JPEG or PNG image file, respectively.
biHeight
Specifies the height of the bitmap, in pixels. If biHeight is positive, the bitmap is a bottom-up DIB and its origin is the lower-left corner. If biHeight is negative, the bitmap is a top-down DIB and its origin is the upper-left corner.
If biHeight is negative, indicating a top-down DIB, biCompression must be either BI_RGB or BI_BITFIELDS. Top-down DIBs cannot be compressed.
Windows 98/Me, Windows 2000/XP: If biCompression is BI_JPEG or BI_PNG, the biHeight member specifies the height of the decompressed JPEG or PNG image file, respectively.
biPlanes
Specifies the number of planes for the target device. This value must be set to 1.
biBitCount
Specifies the number of bits-per-pixel. The biBitCount member of the BITMAPINFOHEADER structure determines the number of bits that define each pixel and the maximum number of colors in the bitmap. This member must be one of the following values.
biCompression
Specifies the type of compression for a compressed bottom-up bitmap (top-down DIBs cannot be compressed). This member can be one of the following values.
biSizeImage
Specifies the size, in bytes, of the image. This may be set to zero for BI_RGB bitmaps.
Windows 98/Me, Windows 2000/XP: If biCompression is BI_JPEG or BI_PNG, biSizeImage indicates the size of the JPEG or PNG image buffer, respectively.
biXPelsPerMeter
Specifies the horizontal resolution, in pixels-per-meter, of the target device for the bitmap. An application can use this value to select a bitmap from a resource group that best matches the characteristics of the current device.
biYPelsPerMeter
Specifies the vertical resolution, in pixels-per-meter, of the target device for the bitmap.
biClrUsed
Specifies the number of color indexes in the color table that are actually used by the bitmap. If this value is zero, the bitmap uses the maximum number of colors corresponding to the value of the biBitCount member for the compression mode specified by biCompression.
If biClrUsed is nonzero and the biBitCount member is less than 16, the biClrUsed member specifies the actual number of colors the graphics engine or device driver accesses. If biBitCount is 16 or greater, the biClrUsed member specifies the size of the color table used to optimize performance of the system color palettes. If biBitCount equals 16 or 32, the optimal color palette starts immediately following the three DWORD masks.
When the bitmap array immediately follows the BITMAPINFO structure, it is a packed bitmap. Packed bitmaps are referenced by a single pointer. Packed bitmaps require that the biClrUsed member must be either zero or the actual size of the color table.
biClrImportant
Specifies the number of color indexes that are required for displaying the bitmap. If this value is zero, all colors are required.