C++ 在Qt中递归迭代目录及其子目录中的所有文件
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/8052460/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Recursively iterate over all the files in a directory and its subdirectories in Qt
提问by Dimse
I want to recursively scan a directory and all its sub-directories for files with a given extension - for example, all *.jpg files. How can you do that in Qt?
我想递归扫描目录及其所有子目录以查找具有给定扩展名的文件 - 例如，所有 *.jpg 文件。你怎么能在 Qt 中做到这一点？
回答by Luca Carlon
I suggest you have a look at QDirIterator.
我建议你看看QDirIterator。
QDirIterator it(dir, QStringList() << "*.jpg", QDir::Files, QDirIterator::Subdirectories);
while (it.hasNext())
qDebug() << it.next();
You could simply use QDir::entryList()recursively, but QDirIterator is simpler. Also, if you happen to have directories with a huge amount of files, you'd get pretty large lists from QDir::entryList(), which may not be good on small embedded devices.
您可以简单地递归使用QDir::entryList()，但 QDirIterator 更简单。此外，如果您碰巧有包含大量文件的目录，您会从 QDir::entryList() 获得相当大的列表，这在小型嵌入式设备上可能不太好。
回答by pnezis
This should work :
这应该工作：
void scanDir(QDir dir)
{
dir.setNameFilters(QStringList("*.nut"));
dir.setFilter(QDir::Files | QDir::NoDotAndDotDot | QDir::NoSymLinks);
qDebug() << "Scanning: " << dir.path();
QStringList fileList = dir.entryList();
for (int i=0; i<fileList.count(); i++)
{
if(fileList[i] != "main.nut" &&
fileList[i] != "info.nut")
{
qDebug() << "Found file: " << fileList[i];
}
}
dir.setFilter(QDir::AllDirs | QDir::NoDotAndDotDot | QDir::NoSymLinks);
QStringList dirList = dir.entryList();
for (int i=0; i<dirList.size(); ++i)
{
QString newPath = QString("%1/%2").arg(dir.absolutePath()).arg(dirList.at(i));
scanDir(QDir(newPath));
}
}
The differences from your code are the following:
与您的代码的区别如下：
- Breadth first search instead of depth first search (no reason for it, I just prefer it)
- More filters in order to avoid sym links
- EntryList instead of EntryInfoList. You don t need if you just want the name of the file.
- 广度优先搜索而不是深度优先搜索（没有理由，我只是喜欢它）
- 更多过滤器以避免符号链接
- EntryList 而不是 EntryInfoList。如果您只想要文件的名称，则不需要。
I tested it and it works correctly, but notice the following:
我测试了它并且它工作正常，但请注意以下几点：
- This may take a lot of time, so consider running it from thread
- If there is deep recursion you may have problem with your stack
- 这可能需要很多时间，所以考虑从线程运行它
- 如果存在深度递归，您的堆栈可能有问题
回答by Paul-Sebastian Manole
I used QDirIterator.
我使用了 QDirIterator。
Here's how I do it and how simple it was to find all XML absolute file paths recursively very fast (Qt4.8.1):
这是我的做法，以及以非常快的速度递归查找所有 XML 绝对文件路径是多么简单（Qt4.8.1）：
// used to store the file paths
filesStack = new QStack<QString>();
// I use a file dialog to let the user choose the root folder to search in
if (fileDialog->exec() == QFileDialog::Accepted) {
QDir selectedDir(fileDialog->selectedFiles().first());
selectedDir.setFilter(QDir::Files |
QDir::Dirs | QDir::NoDot | QDir::NoDotDot);
QStringList qsl; qsl.append("*.xml"); // I only want XML files
selectedDir.setNameFilters(qsl);
findFilesRecursively(selectedDir);
}
// this function stores the absolute paths of each file in a QVector
void findFilesRecursively(QDir rootDir) {
QDirIterator it(rootDir, QDirIterator::Subdirectories);
while(it.hasNext()) {
filesStack->push(it.next());
}
}
Thanks to everyone for the hints.
感谢大家的提示。
EDIT: I may have omitted some declarations, beware.
编辑：我可能省略了一些声明，请注意。
回答by MangoCat
Another sample which indexes all files, using QFileInfo:
另一个使用 QFileInfo 索引所有文件的示例：
void ID3Tab::scanDir( QDir dir )
{ QFileInfoList fil = dir.entryInfoList( QStringList( "*.mp3" ),
QDir::Files | QDir::NoDotAndDotDot | QDir::NoSymLinks,
QDir::Name | QDir::IgnoreCase );
foreach ( QFileInfo fi, fil )
indexFile( fi );
QFileInfoList dil = dir.entryInfoList( QStringList( "*" ),
QDir::AllDirs | QDir::NoDotAndDotDot | QDir::NoSymLinks,
QDir::Name | QDir::IgnoreCase );
foreach ( QFileInfo di, dil )
scanDir( QDir( di.absoluteFilePath() ) );
}
