However, passing a long string as the Buffer parameter does not produce the correct result. The fmShareExclusive specifies that the file cannot be read or write by other processes.
WriteBuffer v, SizeOf v ; end; finally fs.
The timing is roughly the same but using fmOpenWrite if you intend no read might be a slightly bit faster. The fmShareDenyNone specifies that the file can by read or write no limitation by other processes. However, since the file is opened only in write mode fmOpenWriteif you try to add fs.
The prototype for Write is: Longint; Read is useful when the number of bytes in the file is not known. In this case, if you specify fmCreate or fmOpenWrite, it is actually the same as fmCreate or fmOpenReadWrite, in such case, you can use ReadBuffer to read the data you have written before or zero if it has not been written by WriteBuffer.
Read then advances the current position by the number of bytes actually transferred. The Permanent URL is: You can use them in your applications as a way to save components and their properties when you create or alter them at run time.
Reading and writing strings If you are passing a string to a read or write function, you need to be aware of the correct syntax. The fmShareDenyRead specifies that the file can by write but not read by other processes. The fmShareDenyWrite specifies that the file can by read but not write by other processes.
This is in contrast to the Read and Write methods, which can return a byte count that differs from the requested value.
The Buffer parameters for the read and write routines are var and const types, respectively. Seek 0, soBeginning ; for i: The File Open modes are defined in SysUtils. Longint ; These methods call the Read and Write methods to perform the actual reading and writing.
These are untyped parameters, so the routine takes the address of a variable. These procedures are useful in cases where the number of bytes is known and required, for example when reading in structures. The counterpart procedures are ReadBuffer and WriteBuffer which, unlike Read and Write, do not return the number of bytes read or written.
You need to first cast the string to a Pointer or PChar, and then dereference it.The counterpart procedures are ReadBuffer and WriteBuffer which, unlike Read and Write, do not return the number of bytes read or written.
These procedures are useful in cases where the number of bytes is known and required, for example when reading in structures. Use ReadBuffer to read Count bytes from the stream into a buffer in cases where the number of bytes is known and fixed, for example when reading in structures.
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Learn about using the TStream class in Delphi: how to use stream objects to read from, write to, or copy information stored in a particular medium. TFileStream (for working with files) TMemoryStream (for working with a memory buffer) TStringStream (for manipulating in-memory strings).
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