mmioSeek function (mmiscapi.h)

Article
02/22/2024

The mmioSeek function changes the current file position in a file opened by using the mmioOpen function.

Syntax

LONG mmioSeek(
  HMMIO hmmio,
  LONG  lOffset,
  int   iOrigin
);

Parameters

hmmio

File handle of the file to seek in.

lOffset

Offset to change the file position.

iOrigin

Flags indicating how the offset specified by lOffset is interpreted. The following values are defined:

Name	Description
SEEK_CUR	Seeks to lOffset bytes from the current file position.
SEEK_END	Seeks to lOffset bytes from the end of the file.
SEEK_SET	Seeks to lOffset bytes from the beginning of the file.

Return value

Returns the new file position, in bytes, relative to the beginning of the file. If there is an error, the return value is –1.

Remarks

Seeking to an invalid location in the file, such as past the end of the file, might not cause mmioSeek to return an error, but it might cause subsequent I/O operations on the file to fail.

To locate the end of a file, call mmioSeek with lOffset set to zero and iOrigin set to SEEK_END.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	mmiscapi.h (include Mmiscapi.h, Windows.h)
Library	Winmm.lib
DLL	Winmm.dll

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