Cdib.cpp文件
#include "stdafx.h"
#include "cdib.h"
#include "windowsx.h"
#include "math.h"
#define WIDTHBYTES(bits) (((bits) + 31) / 32 * 4)

CDib::CDib()
{
size=0;
}

CDib::~CDib()
{
GlobalFreePtr(m_pBitmapInfo);
}

void CDib::LoadFile(const char* dibFileName)
{
strcpy(m_fileName,dibFileName);
CFile dibFile(m_fileName, CFile::modeRead);
dibFile.Read((void*)&bitmapFileHeader,sizeof(BITMAPFILEHEADER));
if (bitmapFileHeader.bfType == 0x4d42)
{
DWORD fileLength = dibFile.GetLength();
size = fileLength -sizeof(BITMAPFILEHEADER);
pDib =(BYTE*)GlobalAllocPtr(GMEM_MOVEABLE, size);
dibFile.Read((void*)pDib, size);
dibFile.Close();
m_pBitmapInfo = (BITMAPINFO*) pDib;
m_pBitmapInfoHeader = (BITMAPINFOHEADER*) pDib;
m_pRGB = (RGBQUAD*)(pDib +
m_pBitmapInfoHeader->biSize);
int m_numberOfColors = GetNumberOfColors();
if (m_pBitmapInfoHeader->biClrUsed == 0)
m_pBitmapInfoHeader->biClrUsed =
m_numberOfColors;
DWORD colorTableSize = m_numberOfColors *
sizeof(RGBQUAD);
m_pData = pDib + m_pBitmapInfoHeader->biSize
+ colorTableSize;
if (m_pRGB == (RGBQUAD*)m_pData) // No color table
m_pRGB = NULL;
m_pBitmapInfoHeader->biSizeImage = GetSize();
m_valid = TRUE;
}
else
{
m_valid = FALSE;
AfxMessageBox("This isn't a bitmap file!");
}
}

BOOL CDib::IsValid()
{
return m_valid;
}

char* CDib::GetFileName()
{
return m_fileName;
}

UINT CDib::GetWidth()
{
return (UINT) m_pBitmapInfoHeader->biWidth;
}

UINT CDib::GetHeight()
{
return (UINT) m_pBitmapInfoHeader->biHeight;
}

DWORD CDib::GetSize()
{
if (m_pBitmapInfoHeader->biSizeImage != 0)
return m_pBitmapInfoHeader->biSizeImage;
else
{
DWORD height = (DWORD) GetHeight();
DWORD width = (DWORD) GetWidth();
return height * width;
}
}

UINT CDib::GetNumberOfColors()
{
int numberOfColors;

if ((m_pBitmapInfoHeader->biClrUsed == 0) &&
(m_pBitmapInfoHeader->biBitCount < 9))
{
switch (m_pBitmapInfoHeader->biBitCount)
{
case 1: numberOfColors = 2; break;
case 4: numberOfColors = 16; break;
case 8: numberOfColors = 256;
}
}
else
numberOfColors = (int) m_pBitmapInfoHeader->biClrUsed;

return numberOfColors;
}

BYTE* CDib::GetData()
{
return m_pData;
}

RGBQUAD* CDib::GetRGB()
{
return m_pRGB;
}

BITMAPINFO* CDib::GetInfo()
{
return m_pBitmapInfo;
}

WORD CDib::PaletteSize(LPBYTE lpDIB)
{
return (DIBNumColors(lpDIB) * sizeof(RGBTRIPLE));
}

WORD CDib::DIBNumColors(LPBYTE lpDIB)
{
WORD wBitCount; // DIB bit count
wBitCount = ((LPBITMAPCOREHEADER)lpDIB)->bcBitCount;
switch (wBitCount)
{
case 1:
return 2;
case 4:
return 16;
case 8:
return 256;
default:
return 0;
}
}

void CDib::SaveFile(const CString filename)
{
strcpy(m_fileName,filename);
CFile dibFile(m_fileName, CFile::modeCreate|CFile::modeWrite);
dibFile.Write((void*)&bitmapFileHeader,sizeof(BITMAPFILEHEADER));
dibFile.Write((void*)pDib, size);
dibFile.Close();

}
Cdib.h文件
#ifndef __CDIB_H
#define __CDIB_H

class CDib : public CObject
{
public:
RGBQUAD* m_pRGB;
BYTE* m_pData;
UINT m_numberOfColors;
BOOL m_valid;
BITMAPFILEHEADER bitmapFileHeader;

BITMAPINFOHEADER* m_pBitmapInfoHeader;
BITMAPINFO* m_pBitmapInfo;
BYTE* pDib;
DWORD size;
public:
CDib();
~CDib();

char m_fileName[256];
char* GetFileName();
BOOL IsValid();
DWORD GetSize();
UINT GetWidth();
UINT GetHeight();
UINT GetNumberOfColors();
RGBQUAD* GetRGB();
BYTE* GetData();
BITMAPINFO* GetInfo();

WORD PaletteSize(LPBYTE lpDIB);
WORD DIBNumColors(LPBYTE lpDIB);
void SaveFile(const CString filename);

public:
void LoadFile(const char* dibFileName);

};

#endif