diff -r 89d6a7a84779 -r 25a17d01db0c Symbian3/PDK/Source/GUID-A7C26FE4-54B2-58D6-9FDF-4B0A565D00DE.dita --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Symbian3/PDK/Source/GUID-A7C26FE4-54B2-58D6-9FDF-4B0A565D00DE.dita Fri Jan 22 18:26:19 2010 +0000 @@ -0,0 +1,66 @@ + + + + + +Seeking +a Position in a Large File This tutorial shows how to seek a particular position in a large +file. +

The function RFile64::Seek() is the 64-bit +version of RFile::Seek(). The Seek() function +can modify the file pointer to point to any position addressable by the aPos parameter.

RFile64::Seek(TSeek +aMode, TInt64& aPos).

To get the current position of +the file pointer use the TSeek mode ESeekCurrent. +The function updates the output parameter with the new file pointer position +in 64-bits.

Different modes of operation can be specified. These modes +are defined by TSeek.

 + +Use TInt64 instead +of TInt for the offset from the location specified in aMode. +// Remove TInt filePosition = 0; +TInt64 filePosition = 0; + +To retrieve the +current position of the file pointer in a large file use RFile::Seek64() with +the mode ESeekCurrent. +TInt64 filePosition = 0; +// Remove r = file.Seek(ESeekCurrent, filePosition); +r = file.Seek64(ESeekCurrent, filePosition); + +To set the file +pointer to a particular positionwithin a large file use RFile::Seek64() with +the seek mode ESeekStart and a seek position value that +is of type TInt64. +TInt64 seekPos = 3000000000; +// Remove r = file.Seek(ESeekStart, seekPos); +r = file.Seek64(ESeekStart, seekPos); + + +Seek position example

If large file seek is required +use RFile64::Seek() instead of RFile::Seek() and +use a TInt64 value to specify the location.

// RFile file; + RFile64 file; + TInt err = file.Open(TheFs, _L(“BIGFILE.BIG”), EFileWrite); + if(err != KErrNone) + { + // We will only get here if a real error condition occurs. + return err; + } + + // Large file access is now supported! + // TInt seekPos = 0; + Tint64 seekPos = 0; + + // Seek the current position. This can be greater than 2GB. + err = file.Seek(ESeekEnd, seekPos); + if(err != KErrNone) + { + return err; + } + \ No newline at end of file