1、方法一：以一定规律命名的图像，通过stringstream由int型变换为string型，对图像进行读取；
2、方法二：以文本文件的格式批量读取图像：如以.txt格式，则.txt的内容如下：【注】：每行为一个图像名；
3、方法三：只需要一个“dirent.h”头文件，便可以遍历指定文件夹的所有文件；代码如下：
4、dirent.h：头文件可以通过百度搜索并下载。
5、dirent.h：中的函数：/* * Open directory stream using plain old C-string.*/ static DIR* opendir(const char *dirname) { struct DIR *dirp; int error; /* Must have directory name */ if (dirname == NULL || dirname[0] == '\0') { dirent_set_errno (ENOENT); return NULL; } /* Allocate memory for DIR structure */ dirp = (DIR*) malloc (sizeof (struct DIR)); if (dirp) { wchar_t wname[PATH_MAX]; size_t n; /* Convert directory name to wide-character string */ error = dirent_mbstowcs_s (&n, wname, PATH_MAX, dirname, PATH_MAX); if (!error) { /* Open directory stream using wide-character name */ dirp->wdirp = _wopendir (wname); if (dirp->wdirp) { /* Directory stream opened */ error = 0; } else { /* Failed to open directory stream */ error = 1; } } else { /* * Cannot convert file name to wide-character string. This * occurs if the string contains invalid multi-byte sequences or * the output buffer is too small to contain the resulting * string. */ error = 1; } } else { /* Cannot allocate DIR structure */ error = 1; } /* Clean up in case of error */ if (error && dirp) { free (dirp); dirp = NULL; } return dirp; }
6、/** Read next directory entry.** When working with text consoles, ple锾攒揉敫ase note that file names returned by* readdir() are represented in the default ANSI code page while any output to* console is typically formatted on another code page. Thus, non-ASCII* characters in file names will not usually display correctly on console. The* problem can be fixed in two ways: (1) change the character set of console* to 1252 using chcp utility and use Lucida Console font, or (2) use* _cprintf function when writing to console. The _cprinf() will re-encode* ANSI strings to the console code page so many non-ASCII characters will* display correcly.*/ static struct dirent* readdir(DIR *dirp) { WIN32_FIND_DATAW *datap; struct dirent *entp; /* Read next directory entry */ datap = dirent_next (dirp->wdirp); if (datap) { size_t n; int error; /* Attempt to convert file name to multi-byte string */ error = dirent_wcstombs_s(&n, dirp->ent.d_name, PATH_MAX, datap->cFileName, PATH_MAX); /* * If the file name cannot be represented by a multi-byte string, * then attempt to use old 8+3 file name. This allows traditional * Unix-code to access some file names despite of unicode * characters, although file names may seem unfamiliar to the user. * * Be ware that the code below cannot come up with a short file * name unless the file system provides one. At least * VirtualBox shared folders fail to do this. */ if (error && datap->cAlternateFileName[0] != '\0') { error = dirent_wcstombs_s( &n, dirp->ent.d_name, PATH_MAX, datap->cAlternateFileName, PATH_MAX); } if (!error) { DWORD attr; /* Initialize directory entry for return */ entp = &dirp->ent; /* Length of file name excluding zero terminator */ entp->d_namlen = n - 1; /* File attributes */ attr = datap->dwFileAttributes; if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) { entp->d_type = DT_CHR; } else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) { entp->d_type = DT_DIR; } else { entp->d_type = DT_REG; } /* Reset dummy fields */ entp->d_ino = 0; entp->d_reclen = sizeof (struct dirent); } else { /* * Cannot convert file name to multi-byte string so construct * an errornous directory entry and return that. Note that * we cannot return NULL as that would stop the processing * of directory entries completely. */ entp = &dirp->ent; entp->d_name[0] = '?'; entp->d_name[1] = '\0'; entp->d_namlen = 1; entp->d_type = DT_UNKNOWN; entp->d_ino = 0; entp->d_reclen = 0; } } else { /* No more directory entries */ entp = NULL; } return entp; }
7、/** Close directory stream.*/ static int closedir(DIR *dirp) { int ok; if (dirp) { /* Close wide-character directory stream */ ok = _wclosedir (dirp->wdirp); dirp->wdirp = NULL; /* Release multi-byte character version */ free (dirp); } else { /* Invalid directory stream */ dirent_set_errno (EBADF); ok = /*failure*/-1; } return ok; }