Dev C++中操作文件夹的头文件及其用法

/* * DIRENT.H (formerly DIRLIB.H) * This file has no copyright assigned and is placed in the Public Domain. * This file is a part of the mingw-runtime package. * No warranty is given; refer to the file DISCLAIMER within the package. * */ #ifndef _DIRENT_H_ #define _DIRENT_H_ /* All the headers include this file. */ #include <_mingw.h> #include <io.h> #ifndef RC_INVOKED #ifdef __cplusplus extern "C" { #endif struct dirent { long d_ino; /* Always zero. */ unsigned short d_reclen; /* Always zero. */ unsigned short d_namlen; /* Length of name in d_name. */ char d_name[FILENAME_MAX]; /* File name. */ }; /* * This is an internal data structure. Good programmers will not use it * except as an argument to one of the functions below. * dd_stat field is now int (was short in older versions). */ typedef struct { /* disk transfer area for this dir */ struct _finddata_t dd_dta; /* dirent struct to return from dir (NOTE: this makes this thread * safe as long as only one thread uses a particular DIR struct at * a time) */ struct dirent dd_dir; /* _findnext handle */ long dd_handle; /* * Status of search: * 0 = not started yet (next entry to read is first entry) * -1 = off the end * positive = 0 based index of next entry */ int dd_stat; /* given path for dir with search pattern (struct is extended) */ char dd_name[1]; } DIR; DIR* __cdecl opendir (const char*); struct dirent* __cdecl readdir (DIR*); int __cdecl closedir (DIR*); void __cdecl rewinddir (DIR*); long __cdecl telldir (DIR*); void __cdecl seekdir (DIR*, long); /* wide char versions */ struct _wdirent { long d_ino; /* Always zero. */ unsigned short d_reclen; /* Always zero. */ unsigned short d_namlen; /* Length of name in d_name. */ wchar_t d_name[FILENAME_MAX]; /* File name. */ /* NOTE: The name in the dirent structure points to the name in the * wfinddata_t structure in the _WDIR. */ }; /* * This is an internal data structure. Good programmers will not use it * except as an argument to one of the functions below. */ typedef struct { /* disk transfer area for this dir */ struct _wfinddata_t dd_dta; /* dirent struct to return from dir (NOTE: this makes this thread * safe as long as only one thread uses a particular DIR struct at * a time) */ struct _wdirent dd_dir; /* _findnext handle */ long dd_handle; /* * Status of search: * 0 = not started yet (next entry to read is first entry) * -1 = off the end * positive = 0 based index of next entry */ int dd_stat; /* given path for dir with search pattern (struct is extended) */ wchar_t dd_name[1]; } _WDIR; _WDIR* __cdecl _wopendir (const wchar_t*); struct _wdirent* __cdecl _wreaddir (_WDIR*); int __cdecl _wclosedir (_WDIR*); void __cdecl _wrewinddir (_WDIR*); long __cdecl _wtelldir (_WDIR*); void __cdecl _wseekdir (_WDIR*, long); #ifdef __cplusplus } #endif #endif /* Not RC_INVOKED */ #endif /* Not _DIRENT_H_ */  

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#include <stdio.h> #include <dirent.h> #include <string.h> int isjpgfilename(char *filename); int main() { DIR *dir; char *folder = "F:/DFM_report/DFM_report1"; char *jpg = "good.jpg"; struct dirent *idir; dir = opendir(folder); if (dir) { while ((idir = readdir(dir)) != NULL) { if (isjpgfilename(idir->d_name)) { printf("%s/t%d/t%d/n", idir->d_name, idir->d_namlen, strlen(idir->d_name)); } } closedir(dir); } if (isjpgfilename(jpg)) { printf("ok"); } getchar(); return 0; } /***/ int isjpgfilename(char *filename) { int len; len = strlen(filename); return (filename[len-1] == 'g' && filename[len-2] == 'p' && filename[len-3] == 'j' && filename[len-4] == '.'); }