在dephi中使用tstream读写数据的技巧（Use tstream to read and write data in dephi skills）.docVIP

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在dephi中使用tstream读写数据的技巧（Use tstream to read and write data in dephi skills）.doc

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在dephi中使用tstream读写数据的技巧（Use tstream to read and write data in dephi skills）

在dephi中使用tstream读写数据的技巧（Use tstream to read and write data in dephi skills） Use TStream to read and write data in Dephi skills The Dephi provides an abstract data type TStream to support streaming data operation. These data are usually from files, databases, memory objects, OLE objects, TStream provides a unified method and simple to read and write data. In general, we do not need to use the TStream class, streaming data reading and writing method in the VCL control package. But if these methods do not meet our requirements, you need to manually control the read and write data. The commonly used methods and properties of TStream: 1. function Read (VaR Buffer; Count: Longint): Longint; virtual; abstract 2. function Write (const Buffer; Count: Longint): Longint; virtual; abstract; 3. function Seek (Offset: Longint; Origin: Word): Longint; virtual; abstract; 4. property Position: Longint; 5. property Size: Longint Read, Write, Seek are pure virtual functions, provides a method to abstract the data read and write and positioning. The Read method to read data from the Stream Buffer buffer, Write is the reverse operation, the return value indicates the actual size of the data read and write. Seek provides a method for mobile data pointer in Stream. The parameter Origin can be soFromBeginning, soFromCurrent, soFromEnd three, Offset is the offset, the return value is the current Stream data pointer position. Position said the data pointer position in Stream. This property is read and written, it is actually realized by calling the Seek method, so the actual use of this property is more convenient. The Size property indicates the current size of the Stream for different Stream, sometimes it is read-only. Two, Stream data read and write. 1. SaveToStream (Stream: TStream); the current position of file:// in the class of data written in Stream 2. LoadFromStream (Stream: TStream); file:// from the current location of reading data in Stream The actual use we basically just use th