Untyped Files

What is translated > File Input and Output > Untyped Files

The Delphi type File is translated to UntypedFile.

The name UntypedFile is used to avoid a conflict with System.IO.File.

// Renamed from File to UntypedFile to avoid conflicts with System.IO.File.

UntypedFile myFile = UntypedFile.CreateRecord();

Untyped files are accessed in blocks.

The record size is specified when the file is opened:

AssignFile(myFile, "Data.bin");

Rewrite(myFile, 1);

If no record size is specified, the Delphi default record size is 128 bytes.

A record size of one means that the record count is also the byte count.

Data is written with BlockWrite:

int recordsWritten;

BlockWrite(

    myFile,

    buffer,

    buffer.Length,

    out recordsWritten);

Data is read with BlockRead:

int recordsRead;

BlockRead(

    myFile,

    buffer,

    buffer.Length,

    out recordsRead);

UntypedFile is derived from TFileRec. TypedFile<T> also uses TFileRec as its binary file base implementation.

This page belongs to the Delphi2C# Documentation