xxx_Open (Services.exe)

A version of this page is also available for

Windows Embedded CE 6.0 R3

4/8/2010

This function is to be implemented by a service and will be called by Services.exe.

Syntax

BOOL xxx_Open(
  DWORD dwData,
  DWORD dwAccess,
  DWORD dwShareMode
);

Parameters

• dwData
  [in] Specifies the value returned by xxx_Init (Services.exe) for the given service instance.

• dwAccess
  [in] Specifies the type of access to the object. An application can obtain read, write, read-write, or device query access. This parameter can be any combination of the following values.

  Value	Description
  GENERIC_READ	Specifies read access to the object. Data can be read from a file and the file pointer can be moved. It can be combined with GENERIC_WRITE to create read-write access.
  GENERIC_WRITE	Specifies write access to the object. Data can be written to the file and the file pointer can be moved. It can be combined with GENERIC_READ for read-write access.

• dwShareMode
  [in] Specifies how the object can be shared. If dwShareMode is zero, than the object cannot be shared. Subsequent open operation on the object will fail, until the handle is closed. To share the object, use a combination of one or more of the following values.

  Value	Description
  FILE_SHARE_READ	Subsequent open operations on the object will succeed only if read access is requested.
  FILE_SHARE_WRITE	Subsequent open operations on the object will succeed only if write access is requested.

Return Value

TRUE indicates success. FALSE indicates failure.

Remarks

This function is called during an application's call to CreateFile. The values for the dwAccess and dwShareMode parameters are passed directly from the call to CreateFile.

Services.exe uses the xxx prefix. When implementing the stream interface, replace xxx with a prefix appropriate for your specific implementation.

Requirements

See Also

Reference

xxx_Init (Services.exe)
xxx_Read (Services.exe)
xxx_Seek (Services.exe)
xxx_Write (Services.exe)
Services.exe Functions

Other Resources

CreateFile