C++：获取图片文件信息-图片名称、类型、像素宽高

转自：C++ 获取图片文件信息 - 席纳霍霍 - 博客园

参考：图片头文件信息解析_adzcsx2的博客-CSDN博客_图片头文件

#include <gl/glut.h>
#include <opencv2/opencv.hpp>
#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
using namespace cv;
#define JPEG_FILE_TYPE          1
#define BMP_FILE_TYPE           2
#define PNG_FILE_TYPE           3
#define GIF_FILE_TYPE           4/*通过文件头标识判断图片格式，jpg： FF, D8bmp： 42 4Dgif： 47 49 46 38png： 89 50 4E 47
*/class  ImageFile {public:static ImageFile* create(const string& path){FILE* fS;const char* filename = path.c_str();fS = fopen(filename,"rb");if (fS != NULL){int i;int iLen = path.length();int iPos = path.rfind('.');if (iPos <= 0){return NULL;}string name = path.substr(iPos + 1, iLen);cout << "iLen: " << iLen << endl;char s1[10];char s2[] = "jpg";char s3[] = "bmp";char s4[] = "gif";char s5[] = "png";char s6[] = "jpeg";for (i = 0; i < name.length(); i++){cout << name[i] << endl;s1[i] = name[i];}s1[i+1] = '\0';if (strncmp(s1, s2, 3) == 0 || strncmp(s1, s3, 3) == 0 || strncmp(s1, s4, 3) == 0 || strncmp(s1, s5, 3) == 0 || strncmp(s1, s6, 4) == 0)return new ImageFile(path);     //路径正确且图片文件格式是以上四种，创建文件对象else {cout << "error" << endl;return NULL;}}cout << "error 2" << endl;return NULL;}string type() const;string location() const;string fileName() const;double width() const;double height() const;private:ImageFile(const string& path);const char* src;string mpath;string mtype;double mwidth;double mheight;};int check_fileType(const unsigned char* buf)
{if (buf[0] == 0xFF && buf[1] == 0xd8 && buf[2] == 0xFF){return JPEG_FILE_TYPE;}if (buf[0] == 0x42 && buf[1] == 0x4d){return BMP_FILE_TYPE;}if (buf[0] == 0x47 && buf[1] == 0x49 && buf[2] == 0x46 && buf[3] == 0x38){return GIF_FILE_TYPE;}if (buf[0] == 0x89 && buf[1] == 0x50 && buf[2] == 0x4e && buf[3] == 0x47){return PNG_FILE_TYPE;}elsereturn 0;
}/*在构造函数内获取像素宽高：mwidth、mheigh*/ImageFile::ImageFile(const string& path)
{int type;mpath = path;mwidth = 0;mheight = 0;mtype = "";src = path.c_str();int i = 0;int size;unsigned char* buff = NULL;FILE* fp;if ((fp = fopen(src, "rb+")) == NULL){mtype = "The file was not opened!";return;}fseek(fp, 0, SEEK_END);size = ftell(fp);buff = (unsigned char*)malloc(size);if (buff)memset(buff, 0, size);fseek(fp, 0, SEEK_SET);if (fread(buff, 1, size, fp) != size){mtype = "read error!";return;}type = check_fileType(buff);switch (type){case JPEG_FILE_TYPE:mtype = "jpg file!";for (i = 0; i < size; i++){if (buff[i] == 0xff && buff[i + 1] == 0xc0){mwidth = (buff[i + 7] << 8) | buff[i + 8];mheight = (buff[i + 5] << 8) | buff[i + 6];break;}}break;case BMP_FILE_TYPE:mtype = "bmp file!";for (i = 0; i < size; i++){if (buff[i] == 0x28 && buff[i + 1] == 0x00){mwidth = (buff[i + 7] << 24) | buff[i + 6] << 16 | buff[i + 5] << 8 | buff[i + 4];mheight = (buff[i + 11] << 24) | buff[i + 10] << 16 | buff[i + 9] << 8 | buff[i + 8];break;}}break;case PNG_FILE_TYPE:mtype = "png file!";for (i = 0; i < size; i++){if (buff[i] == 0x49 && buff[i + 1] == 0x48){mheight = (buff[i + 8] << 24) | buff[i + 9] << 16 | buff[i + 10] << 8 | buff[i + 11];mwidth = (buff[i + 4] << 24) | buff[i + 5] << 16 | buff[i + 6] << 8 | buff[i + 7];break;}}break;case GIF_FILE_TYPE:mtype = "gif file!";for (i = 0; i < size; i++){if (buff[i] == 0x00 && buff[i + 1] == 0x2c){mwidth = (buff[i + 7] << 8) | buff[i + 6];mheight = (buff[i + 9] << 8) | buff[i + 8];break;}}break;default:break;}fclose(fp);free(buff);}string ImageFile::type() const
{return mtype;
}string ImageFile::location() const
{int length = mpath.length();int pos = mpath.rfind('/');while (pos == length - 1){pos = mpath.rfind('/', pos - 1);length--;}if (pos < 0){return "";}return mpath.substr(0, pos + 1);
}string ImageFile::fileName() const
{int length = mpath.length();int pos = mpath.rfind('/');while (pos == length - 1){pos = mpath.rfind('/', pos - 1);length--;}if (pos < 0){return "";}return mpath.substr(pos + 1, length);
}double ImageFile::width() const
{return mwidth;
}double ImageFile::height() const
{return mheight;
}int main()
{ImageFile* IMG = ImageFile::create("2.bmp");cout << IMG->width() << endl;return 0;
}

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