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isDir(), isFile(), and isSymLink(): Return true if the file information object represents a directory, file, or symbolic link (or a shortcut on Windows). dir() and absoluteDir():Return a QDir object represented by the file information object. The dir method can return a directory relative to the current directory, whereas absoluteDir returns a directory path starting with a drive root. exists(): Returns true if the object exists. isHidden(), isReadable(), isWritable(), and isExecutable():Return information about the file s state. fileName():Returns the file name without the path as a QString. filePath():Returns the file name including the path as a QString. The path can be relative to the current directory. absoluteFilePath():Returns the file name including the path as a QString. The path starts with a drive root. completeBaseName() and completeSuffix():Return QString objects holding the name of the file and the suffix (extension) of the file name. Let s use these methods to create an application listing all drives and folders in the root of each drive. The trick is to find the drives using QDir::drives and then find the directories of each drive s root (see Listing 8-1). Listing 8-1. Listing the drives with the root directories #include <QDir> #include <QFileInfo> #include <QtDebug> int main( int argc, char **argv ) { foreach( QFileInfo drive, QDir::drives() ) { qDebug() << "Drive: " << drive.absolutePath(); QDir dir = drive.dir(); dir.setFilter( QDir::Dirs ); foreach( QFileInfo rootDirs, dir.entryInfoList() ) qDebug() << " " << rootDirs.fileName(); } return 0; }

Often, a service will choose the same data format for both its POST request and return values, and thus require client programs to use only one data library for coercion, rather than two Note that many API services are designed for use with a JavaScript program running inside of a web page delivered through a normal GET call Despite the fact that the JavaScript is running in a browser, such services will act like APIs rather than user form posts: they typically do not redirect, but instead send and receive data payloads (typically) rather than browsable web pages..

Note Each vendor has its own terminology for API operations. Technorati decided to call their operations

The QDir::drives method returns a list of QFileInfo objects that are iterated using foreach. After having printed the drive s root path through qDebug, the QDir object for each root is retrieved using the dir method.

We have just introduced the topic of web-based APIs, which fetch documents and data using GET and POST to specific URLs Therefore, we should immediately note that many modern web services try to integrate their APIs more tightly with HTTP by going beyond the two most common HTTP methods by implementing additional methods like PUT and DELETE In general, a web API that is implemented entirely with POST commands remains opaque to proxies, caches, and any other tools that support the HTTP protocol All they know is that a series of unrepeatable special commands are passing between the client and the server But they cannot detect whether resources are being queried, created, destroyed, or manipulated A design pattern named Representational State Transfer has therefore been taking hold in many developer communities This design pattern is based on Roy Fielding s celebrated 2000 doctoral dissertation that first fully defined the concept.

One nice aspect of QDir objects is that they can be used to get a directory listing. By using the filter() method, you can configure the object to return only directories. The directories are then returned as a QList of QFileInfo objects from the entryInfoList method. These QFileInfo objects represent directories, but the fileName method still returns the directory name. The isDir and isFile methods make it possible to confirm that the file name is a directory name or the name of a file. This is easier to understand if you consider directories to be files containing references to their contents. The setFilter( Filters ) method can be used to filter out directory entries based on a number of different criteria. You can also combine the filters criteria to get the entry list you want. The following values are supported: QDir::Dirs: Lists directories that are matched by the name filter. QDir::AllDirs: Lists all directories (does not apply the name filter). QDir::Files: Lists files. QDir::Drives: Lists drives. It is ignored on Unix systems. QDir::NoSymLinks: Does not list symbolic links. It is ignored on platforms in which symbolic links not are supported. QDir::NoDotAndDotDot: Does not list the special entries . and ... QDir::AllEntries: Lists directories, files, drives, and symbolic links. QDir::Readable: Lists readable files. It must be combined with Files or Dirs. QDir::Writeable: Lists writable files. It must be combined with Files or Dirs. QDir::Executable: Lists executable files. It must be combined with Files or Dirs. QDir::Modified: Lists files that have been modified. It is ignored on Unix systems. QDir::Hidden: Lists files that are hidden. On Unix systems, it lists files starting with .. QDir::System: Lists system files. QDir::CaseSensitive: The name filter should be case sensitive if the file system is case sensitive.

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