C++ 如何在C++;?
如何获得目录中的文件列表以便处理每个文件?但是C++ 如何在C++;?,c++,file,directory,C++,File,Directory,如何获得目录中的文件列表以便处理每个文件?但是boost::filesystem可以做到这一点:解决这一问题需要一个特定于平台的解决方案。查找unix/linux上的opendir()或Windows上的FindFirstFile()。或者,有许多库将为您处理特定于平台的部分。下面是Linux上C语言的一个示例。如果您使用的是Linux,并且不介意在ANSIC中执行这一点 #include <dirent.h> DIR *dpdf; struct dirent *epdf; dp
boost::filesystem
可以做到这一点:解决这一问题需要一个特定于平台的解决方案。查找unix/linux上的opendir()或Windows上的FindFirstFile()。或者,有许多库将为您处理特定于平台的部分。下面是Linux上C语言的一个示例。如果您使用的是Linux,并且不介意在ANSIC中执行这一点
#include <dirent.h>
DIR *dpdf;
struct dirent *epdf;
dpdf = opendir("./");
if (dpdf != NULL){
while (epdf = readdir(dpdf)){
printf("Filename: %s",epdf->d_name);
// std::cout << epdf->d_name << std::endl;
}
}
closedir(dpdf);
#包括
DIR*dpdf;
结构方向*epdf;
dpdf=opendir(“./”);
if(dpdf!=NULL){
while(epdf=readdir(dpdf)){
printf(“文件名:%s”,epdf->d_名称);
//std::cout d_name如果您在Windows中使用MSVC,那么MSDN库
下面是该链接的代码:
#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include <strsafe.h>
void ErrorHandler(LPTSTR lpszFunction);
int _tmain(int argc, TCHAR *argv[])
{
WIN32_FIND_DATA ffd;
LARGE_INTEGER filesize;
TCHAR szDir[MAX_PATH];
size_t length_of_arg;
HANDLE hFind = INVALID_HANDLE_VALUE;
DWORD dwError=0;
// If the directory is not specified as a command-line argument,
// print usage.
if(argc != 2)
{
_tprintf(TEXT("\nUsage: %s <directory name>\n"), argv[0]);
return (-1);
}
// Check that the input path plus 2 is not longer than MAX_PATH.
StringCchLength(argv[1], MAX_PATH, &length_of_arg);
if (length_of_arg > (MAX_PATH - 2))
{
_tprintf(TEXT("\nDirectory path is too long.\n"));
return (-1);
}
_tprintf(TEXT("\nTarget directory is %s\n\n"), argv[1]);
// Prepare string for use with FindFile functions. First, copy the
// string to a buffer, then append '\*' to the directory name.
StringCchCopy(szDir, MAX_PATH, argv[1]);
StringCchCat(szDir, MAX_PATH, TEXT("\\*"));
// Find the first file in the directory.
hFind = FindFirstFile(szDir, &ffd);
if (INVALID_HANDLE_VALUE == hFind)
{
ErrorHandler(TEXT("FindFirstFile"));
return dwError;
}
// List all the files in the directory with some info about them.
do
{
if (ffd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
_tprintf(TEXT(" %s <DIR>\n"), ffd.cFileName);
}
else
{
filesize.LowPart = ffd.nFileSizeLow;
filesize.HighPart = ffd.nFileSizeHigh;
_tprintf(TEXT(" %s %ld bytes\n"), ffd.cFileName, filesize.QuadPart);
}
}
while (FindNextFile(hFind, &ffd) != 0);
dwError = GetLastError();
if (dwError != ERROR_NO_MORE_FILES)
{
ErrorHandler(TEXT("FindFirstFile"));
}
FindClose(hFind);
return dwError;
}
void ErrorHandler(LPTSTR lpszFunction)
{
// Retrieve the system error message for the last-error code
LPVOID lpMsgBuf;
LPVOID lpDisplayBuf;
DWORD dw = GetLastError();
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dw,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf,
0, NULL );
// Display the error message and exit the process
lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT,
(lstrlen((LPCTSTR)lpMsgBuf)+lstrlen((LPCTSTR)lpszFunction)+40)*sizeof(TCHAR));
StringCchPrintf((LPTSTR)lpDisplayBuf,
LocalSize(lpDisplayBuf) / sizeof(TCHAR),
TEXT("%s failed with error %d: %s"),
lpszFunction, dw, lpMsgBuf);
MessageBox(NULL, (LPCTSTR)lpDisplayBuf, TEXT("Error"), MB_OK);
LocalFree(lpMsgBuf);
LocalFree(lpDisplayBuf);
}
#包括
#包括
#包括
#包括
void ErrorHandler(LPTSTR lpsz函数);
int_tmain(int argc,TCHAR*argv[])
{
WIN32_查找_数据ffd;
大整数文件大小;
TCHAR szDir[MAX_PATH];
参数的大小和长度;
句柄hFind=无效的句柄值;
DWORD dwError=0;
//如果未将目录指定为命令行参数,
//打印使用。
如果(argc!=2)
{
_tprintf(文本(“\n用法:%s\n”),argv[0]);
返回(-1);
}
//检查输入路径加2是否比最大路径长。
字符串长度(argv[1]、最大路径和长度);
if(参数的长度>(最大路径-2))
{
_tprintf(文本(“\n目录路径太长。\n”);
返回(-1);
}
_tprintf(文本(“\n目标目录为%s\n\n”),argv[1]);
//准备用于FindFile函数的字符串。首先,复制
//字符串添加到缓冲区,然后将“\*”追加到目录名。
StringCchCopy(szDir,MAX_PATH,argv[1]);
StringCchCat(szDir,最大路径,文本(“\\*”);
//查找目录中的第一个文件。
hFind=FindFirstFile(szDir和ffd);
if(无效的句柄值==hFind)
{
ErrorHandler(文本(“FindFirstFile”);
返回dwError;
}
//列出目录中的所有文件及其相关信息。
做
{
if(ffd.dwFileAttributes和文件属性目录)
{
_tprintf(文本(“%s\n”),ffd.cFileName);
}
其他的
{
filesize.LowPart=ffd.nFileSizeLow;
filesize.HighPart=ffd.nFileSizeHigh;
_tprintf(文本(“%s%ld字节\n”)、ffd.cFileName、filesize.QuadPart);
}
}
while(FindNextFile(hFind,&ffd)!=0);
dwError=GetLastError();
if(dwError!=错误\u无\u更多\u文件)
{
ErrorHandler(文本(“FindFirstFile”);
}
FindClose(hFind);
返回dwError;
}
无效错误处理程序(LPTSTR LPSZ函数)
{
//检索最后一个错误代码的系统错误消息
LPVOID lpMsgBuf;
LPVOID lpDisplayBuf;
DWORD dw=GetLastError();
格式化消息(
格式化消息分配缓冲区
格式化来自\u系统的\u消息\u|
格式化\u消息\u忽略\u插入,
无效的
dw,
MAKELANGID(LANG_中立,SUBLANG_默认),
(LPTSTR)和lpMsgBuf,
0,空);
//显示错误消息并退出进程
lpDisplayBuf=(LPVOID)LocalAlloc(LMEM_zeronit,
(lstrlen((LPCTSTR)lpMsgBuf)+lstrlen((LPCTSTR)lpszFunction)+40)*sizeof(TCHAR));
StringCchPrintf((LPTSTR)lpDisplayBuf,
LocalSize(lpDisplayBuf)/sizeof(TCHAR),
文本(“%s失败,错误为%d:%s”),
lpsz函数、dw、lpMsgBuf);
消息框(空,(LPCTSTR)lpDisplayBuf,文本(“错误”),MB_OK);
本地免费(lpMsgBuf);
LocalFree(lpDisplayBuf);
}
您必须使用操作系统调用(例如Win32 API)或其周围的包装器。我倾向于使用它,因为它是优于Win32 API的接口(以及跨平台)
如果您希望使用Win32 API,Microsoft在msdn上有一个列表和。以下是我使用的内容:
/* Returns a list of files in a directory (except the ones that begin with a dot) */
void GetFilesInDirectory(std::vector<string> &out, const string &directory)
{
#ifdef WINDOWS
HANDLE dir;
WIN32_FIND_DATA file_data;
if ((dir = FindFirstFile((directory + "/*").c_str(), &file_data)) == INVALID_HANDLE_VALUE)
return; /* No files found */
do {
const string file_name = file_data.cFileName;
const string full_file_name = directory + "/" + file_name;
const bool is_directory = (file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
if (file_name[0] == '.')
continue;
if (is_directory)
continue;
out.push_back(full_file_name);
} while (FindNextFile(dir, &file_data));
FindClose(dir);
#else
DIR *dir;
class dirent *ent;
class stat st;
dir = opendir(directory);
while ((ent = readdir(dir)) != NULL) {
const string file_name = ent->d_name;
const string full_file_name = directory + "/" + file_name;
if (file_name[0] == '.')
continue;
if (stat(full_file_name.c_str(), &st) == -1)
continue;
const bool is_directory = (st.st_mode & S_IFDIR) != 0;
if (is_directory)
continue;
out.push_back(full_file_name);
}
closedir(dir);
#endif
} // GetFilesInDirectory
/*返回目录中的文件列表(以点开头的文件除外)*/
void GetFilesInDirectory(std::vector&out,const string&directory)
{
#ifdef窗口
handledir;
WIN32_查找_数据文件_数据;
if((dir=FindFirstFile((directory+“/*”).c_str(),&file_data))==INVALID_HANDLE_值)
return;/*未找到任何文件*/
做{
const string file_name=file_data.cFileName;
常量字符串完整文件名=目录+“/”+文件名;
const bool is_directory=(file_data.dwFileAttributes&file_attributes_directory)!=0;
如果(文件名[0]='。)
继续;
if(is_目录)
继续;
out.push_back(完整文件名);
}while(FindNextFile(dir和file_data));
FindClose(dir);
#否则
DIR*DIR;
类指令;
类别统计st;
dir=opendir(目录);
while((ent=readdir(dir))!=NULL){
常量字符串文件\u name=ent->d\u name;
常量字符串完整文件名=目录+“/”+文件名;
如果(文件名[0]='。)
继续;
if(stat(full_file_name.c_str(),&st)=-1)
继续;
const bool is_directory=(st.st_mode&S_IFDIR)!=0;
if(is_目录)
继续;
out.push_back(完整文件名);
}
closedir(dir);
#恩迪夫
}//GetFilesInDirectory
将属性设置为仅查找目录。或者执行此操作,然后读取test.txt:
#include <windows.h>
int main() {
system("dir /b > test.txt");
}
#包括
int main(){
系统(“dir/b>test.txt”);
}
“/b”表示只返回文件名,不返回其他信息。void getFilesList(字符串文件路径、字符串扩展名、向量和返回文件名)
void getFilesList(String filePath,String extension, vector<string> & returnFileName)
{
WIN32_FIND_DATA fileInfo;
HANDLE hFind;
String fullPath = filePath + extension;
hFind = FindFirstFile(fullPath.c_str(), &fileInfo);
if (hFind == INVALID_HANDLE_VALUE){return;}
else {
return FileName.push_back(filePath+fileInfo.cFileName);
while (FindNextFile(hFind, &fileInfo) != 0){
return FileName.push_back(filePath+fileInfo.cFileName);}
}
}
String optfileName ="";
String inputFolderPath ="";
String extension = "*.jpg*";
getFilesList(inputFolderPath,extension,filesPaths);
vector<string>::const_iterator it = filesPaths.begin();
while( it != filesPaths.end())
{
frame = imread(*it);//read file names
//doyourwork here ( frame );
sprintf(buf, "%s/Out/%d.jpg", optfileName.c_str(),it->c_str());
imwrite(buf,frame);
it++;
}
{
WIN32_查找_数据文件信息;
处理高频风;
字符串fullPath=文件路径+扩展名;
hFind=FindFirstFile(fullPath.c_str(),&fileInfo);
如果(hFind==无效的句柄值){return;}
否则{
返回FileName.push_back(filePath+fileInfo.cFileName);
while(FindNextFile(hFind,&fileInfo)!=0){
返回FileName.push_bac
void getFilesList(String filePath,String extension, vector<string> & returnFileName)
{
WIN32_FIND_DATA fileInfo;
HANDLE hFind;
String fullPath = filePath + extension;
hFind = FindFirstFile(fullPath.c_str(), &fileInfo);
if (hFind == INVALID_HANDLE_VALUE){return;}
else {
return FileName.push_back(filePath+fileInfo.cFileName);
while (FindNextFile(hFind, &fileInfo) != 0){
return FileName.push_back(filePath+fileInfo.cFileName);}
}
}
String optfileName ="";
String inputFolderPath ="";
String extension = "*.jpg*";
getFilesList(inputFolderPath,extension,filesPaths);
vector<string>::const_iterator it = filesPaths.begin();
while( it != filesPaths.end())
{
frame = imread(*it);//read file names
//doyourwork here ( frame );
sprintf(buf, "%s/Out/%d.jpg", optfileName.c_str(),it->c_str());
imwrite(buf,frame);
it++;
}
CString dirpath="d:\\mydir"
DWORD errVal = ERROR_SUCCESS;
HANDLE dir;
WIN32_FIND_DATA file_data;
CString file_name,full_file_name;
if ((dir = FindFirstFile((dirname+ "/*"), &file_data)) == INVALID_HANDLE_VALUE)
{
errVal=ERROR_INVALID_ACCEL_HANDLE;
return errVal;
}
while (FindNextFile(dir, &file_data)) {
file_name = file_data.cFileName;
full_file_name = dirname+ file_name;
if (strcmp(file_data.cFileName, ".") != 0 && strcmp(file_data.cFileName, "..") != 0)
{
m_List.AddTail(full_file_name);
}
}
#include <string>
#include <iostream>
#include <boost/filesystem.hpp>
using namespace std;
using namespace boost::filesystem;
int main()
{
path p("D:/AnyFolder");
for (auto i = directory_iterator(p); i != directory_iterator(); i++)
{
if (!is_directory(i->path())) //we eliminate directories in a list
{
cout << i->path().filename().string() << endl;
}
else
continue;
}
}
file1.txt
file2.dat
#include <atlstr.h>
void getFiles(CString directory) {
HANDLE dir;
WIN32_FIND_DATA file_data;
CString file_name, full_file_name;
if ((dir = FindFirstFile((directory + "/*"), &file_data)) == INVALID_HANDLE_VALUE)
{
// Invalid directory
}
while (FindNextFile(dir, &file_data)) {
file_name = file_data.cFileName;
full_file_name = directory + file_name;
if (strcmp(file_data.cFileName, ".") != 0 && strcmp(file_data.cFileName, "..") != 0)
{
std::string fileName = full_file_name.GetString();
// Do stuff with fileName
}
}
}
getFiles("i:\\Folder1");
#include <dirent.h>
if (auto dir = opendir("some_dir/")) {
while (auto f = readdir(dir)) {
if (!f->d_name || f->d_name[0] == '.')
continue; // Skip everything that starts with a dot
printf("File: %s\n", f->d_name);
}
closedir(dir);
}