C++读取BMP文件-白红宇

C++读取BMP文件

阅读量：4511 次

发布时间：2019-06-08

本文共 2532 字，大约阅读时间需要 8 分钟。

#include 
     
      #include 
      
       #include 
       
        using namespace std;class CBitmap{public:    typedef unsigned char BYTE;    typedef unsigned short WORD;    typedef unsigned long DWORD;    typedef long LONG;    typedef struct{        DWORD bfSize;        // file size        WORD bfReserved1;        WORD bfReserved2;        DWORD bfOffBits;    // offset from file header to pixel data    }BITMAPFILEHEADER;    typedef struct{        DWORD biSize;        // structure size        LONG biWidth;        LONG biHeight;        WORD biPlanes;        // must be 1        WORD biBitCount;    // bit number of one pixel        DWORD biCompression;        DWORD biSizeImage;        LONG  biXPelsPerMeter;        LONG  biYPelsPerMeter;        DWORD biClrUsed;        DWORD biClrImportant;    }BITMAPINFOHEADER;    CBitmap(){}    ~CBitmap(){}    bool load(const string& file)    {        ifstream fs(file, ios_base::in | ios_base::beg | ios_base::binary);        if (!fs.is_open()){            return false;        }        fs.read((char*)&m_tag, sizeof(WORD));        if (m_tag != 0x4D42){            return false;        }        fs.read((char*)&m_fileHeader, sizeof(m_fileHeader));        if (fs.gcount() != sizeof(m_fileHeader)){            return false;        }        fs.read((char*)&m_infoHeader, sizeof(m_infoHeader));        if (fs.gcount() != sizeof(m_infoHeader)){            return false;        }        m_palette.resize(m_fileHeader.bfOffBits - sizeof(m_tag)-sizeof(m_fileHeader)-sizeof(m_infoHeader));        fs.read((char*)&m_palette[0], m_palette.size());        m_data.resize(m_fileHeader.bfSize - m_fileHeader.bfOffBits);        fs.read((char*)&m_data[0], m_data.size());        if (fs.gcount() != m_data.size()){            return false;        }        fs.close();        return true;    }    bool save(const string& file)    {        ofstream fs(file, ios_base::binary);        if (!fs.is_open()){            return false;        }        fs.write((char*)&m_tag, sizeof(WORD));        fs.write((char*)&m_fileHeader, sizeof(m_fileHeader));        fs.write((char*)&m_infoHeader, sizeof(m_infoHeader));        fs.write((char*)&m_palette[0], m_palette.size());        fs.write((char*)&m_data[0], m_data.size());        fs.close();        return true;    }    WORD m_tag;    BITMAPFILEHEADER m_fileHeader;    BITMAPINFOHEADER m_infoHeader;    vector
        
          m_palette;    vector
         
           m_data;};