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C-/C++-Quelltext

// pngFile.h

struct pngHeader{
    int width;
    int height;
    char depth;         // Bittiefe 1, 2, 4, 8, 16
    char color_type;    // Farbtyp 0, 2, 3, 4, 6
    char comp;          // compression 0
    char filter;        // 0
    char interlace;     // 0,1
};

class pngFile{
    private:
        pngHeader m_header;

    public:
        pngFile();
        bool load(string path);
};

// pngFile.cpp

bool pngFile::load(string path){
    ifstream file(path.c_str(), ios::binary);

    if(!file.good()){
        cerr<<"Could not open the PNG image file!"<<endl;
        return false;
    }

    // Header
    file.seekg(16);
    file.read(reinterpret_cast<char*>(&m_header.width), sizeof(int));
        
    return true;
};

C-/C++-Quelltext

struct pngHeader{
    unsigned char width[4];
    unsigned char height[4];
    unsigned char depth;            // Bittiefe 1, 2, 4, 8, 16
    unsigned char color_type;   // Farbtyp 0, 2, 3, 4, 6
    unsigned char comp;         // compression 0
    unsigned char filter;       // 0
    unsigned char interlace;        // 0,1
};

// Header lesen
    file.seekg(16);
    file.read(reinterpret_cast<char*>(&m_header.width), sizeof(pngHeader));
        
    cout<<int(m_header.width[3])<<endl;     // = 64 Passt!
    cout<<int(m_header.height[3])<<endl;    // = 128 Passt auch!