qdatastream

The qdatastream class serializes binary data to qiodevice. # Include InstituteList of member functions.Public Member Qdatastream() Qdatastream(Qiodevice * D) Qdatastream(Qbytearray A, int Mode) Virtual~ Qdatastream() Qiodevice *Device() Const VoidSetdevice(Qiodevice

1 #-*-coding:utf-8-*-2 fromPyqt4.qtguiImport*3 fromPyqt4.qtcoreImport*4 ImportSYS5QTEXTCODEC.SETCODECFORTR (Qtextcodec.codecforname ("UTF8"))6 7 classSettings (qdialog):8 def __init__(self,parent=None):9Super (Settings,self).__init__(parent)TenSelf.setwindowtitle (self.tr ("access to files using Qdatastream")) One ASelf.label = Qlabel (self.tr ("Channel:")) -Self.channelspinbox =Qspinbox () -Self.channelSpinBox.setRange (0,20) theSelf.t

In the previous chapter, we covered the use of two classes for Qfile and Qfileinfo. We mentioned that Qiodevice provides basic operations such as read (), ReadLine (). At the same time, QT provides a higher level of operation: the flow qdatastream for binary and the Qtextstream for text flow. In this section, we will explain the use of qdatastream and some techniques. The next chapter is the relevant conten

In the previous chapter, we covered the QFile QFileInfo use of and two classes. We mentioned that it QIODevice provides read() , and readLine() so on, basic operations. At the same time, QT provides a higher level of operation: for binary streams QDataStream and for text streams QTextStream . In this section, we will explain QDataStream the use and some techniques. The next chapter is QTextStream the releva

The objects of the custom classes in MFC and Java can be persisted, and the Qt Persistence object serialization is certainly essential.But this problem really bothered me for a long time ...MFC by overriding virtual functions serialize (), Java is the class that belongs to must implement Java.io.Serializable or Externalizable interface complete,How does QT fix this thing, Qdatastream class: Let us think of MFC in the Cachive class,The Java.io.objectou

Qt provides the qfile class for file processing. To make it easier to process text files or binary files, QT also provides the qtextstream class and qdatastream class. You can use qtemporaryfile to process temporary files, you can use qfileinfo to obtain file information.To process the directory, you can use qdir. To monitor file and directory changes, you can use qfilesystemwatcher. Read/write text filesThe qfile class provides interfaces for reading

access the device any number of times from any location, and use the QIODevice: seek () function to locate the file pointer. In terms of access methods, Qt provides two high-level abstractions: Using QDataStream for binary access and using QTextStream for text access. These classes can help us control byte sequence and text encoding, freeing programmers from this problem. QFile is very convenient for accessing independent files, whether in the file s

The objects of the custom classes in MFC and Java can be persisted, and the Qt Persistence object serialization is certainly essential.But this problem really bothered me for a long time ...MFC by overriding virtual functions serialize (), Java is the class that belongs to must implement Java.io.Serializable or Externalizable interface complete,How does QT fix this thing, Qdatastream class: Let us think of MFC in the Cachive class,The Java.io.objectou

The use of QT network communication is always simple to send data-receive data, the common is to send a string/byte stream, and then based on the string/byte stream to extract useful information. This can meet the actual needs in the communication that is not very complex. but also has the disadvantage, is every time writes the network communication is the verbal agreement one protocol, lets the sender and the receiver both satisfy this agreement can carry on the normal communication. So if ever

The meaning of a serialization operation is, by definition, saving data to a storage device in a certain order, or reading a sequence of data from a storage device, and the data type is consistent (that is, the data you read is the type I know). The process knows, how to do it?I am a simple program implemented with the help of the QT framework. (The framework, of course, implements the complex part.) If in your encapsulated data, meaning non-QT standard data types, then it is necessary to implem

Qt provides the qfile class for file processing. To make it easier to process text files or binary files, QT also provides the qtextstream class and qdatastream class. You can use qtemporaryfile to process temporary files, you can use qfileinfo to obtain file information and qdir to process directories. you can use qfilesystemwatcher to monitor file and directory changes. the qfile class for reading and writing text files provides interfaces for readi

Begin Previously, I only summarized the UI processing of transparent, borderless, and movable windows. In order to provide some learning materials to some students, I would like to summarize some functional points. Principle: less nonsense and more code. Login window Log on to tcpsocket. If you have to ask why I am not a UDP socket, I can only say that TCP is reliable. Login After setting the IP port, use qdatastream to write qiodevice Void login:

); // It must be of the const char * type. File. close (); // QDebug () } If (file. open (QIODevice: ReadOnly )) { QString name = ""; Double value = 0; // The returned value of read is a QByteArray byte array. When the value is assigned to the QString variable type, the data type is automatically converted. The following statement can also be written as name = file. read (10 ); Name = QString (file. read (10 )); File. read (reinterpret_cast ( Value), sizeof (value )); File. close (); Q

In the previous chapter we described the reading and writing of binary files. Binary files are small, but not human-readable formats. A text file is a human-readable file. In order to manipulate this file, we need to use QTextStream classes. QTextStream QDataStream is similar to the usage, except that it operates on plain text files. In addition, such as XML, HTML, although it is also a text file, can be QTextStream generated, but Qt provides a more c

and delete through the pointer pn 3. Use QDataStream One of the constructors is: QDataStream (QIODevice * d) QIODevice describes an input/output medium that can read data from and write data to it. The QFile class is an example of an IO Device. First, the code for opening the file is as follows: Useless parts deleted Void addressbookqt5vesion: rev_openfile () {QString path = qfiledision: getOpenFileName

container class store: 1 QlistMovie> movs; The Qt container class can be QDataStream accessed directly using the. At this point, the type stored in the container must also be used QDataStream for storage. This means that we need overloads operator and operator>>() operators: 1234567891011121314151617 qdatastream