Edit

CreateDeltaB function

  • Article

Creates a delta between the source and target (provided as buffers) and returns the output delta as an MSDelta-allocated buffer.

Note

You must call DeltaFree to free the output buffer after this function has completed.

Syntax

BOOL  WINAPI  CreateDeltaB(
           DELTA_FILE_TYPE  FileTypeSet,
           DELTA_FLAG_TYPE  SetFlags,
           DELTA_FLAG_TYPE  ResetFlags,
           DELTA_INPUT      Source,
           DELTA_INPUT      Target,
           DELTA_INPUT      SourceOptions,
           DELTA_INPUT      TargetOptions,
           DELTA_INPUT      GlobalOptions,
    const  FILETIME        *lpTargetFileTime,
           ALG_ID           HashAlgId,
           LPDELTA_OUTPUT   lpDelta
    );

Parameters

FileTypeSet

[in] The DELTA_FILE_TYPE value that indicates the file type set to be used for the create process.

SetFlags

[in] One or more DELTA_FLAG_TYPE values that specify the flags to be used during the create process, in addition to the default flags.

ResetFlags

[in] One or more DELTA_FLAG_TYPE values that specify the default flags to be reset during the create process.

Source

[in] A DELTA_INPUT structure containing a pointer to the buffer containing the source data.

Target

[in] A DELTA_INPUT structure containing a pointer to the buffer containing the target data.

SourceOptions

[in] Reserved. Pass a DELTA_INPUT structure with Editable set to FALSE, lpStart set to NULL and uSize set to 0.

TargetOptions

[in] Reserved. Pass a DELTA_INPUT structure with Editable set to FALSE, lpStart set to NULL and uSize set to 0.

GlobalOptions

[in] Reserved. Pass a DELTA_INPUT structure with lpStart set to NULL and uSize set to 0.

lpTargetFileTime

[in] The time stamp set on the target file after delta apply. If NULL, the target timestamp will be the current time during the create process.

HashAlgId

[in] ALG_ID of the algorithm to be used to generate the target signature. Some special values are:

  • 0 = No signature
  • 32 = 32-bit CRC defined in msdelta.dll

lpDelta

[out] Pointer to the DELTA_OUTPUT structure where the delta is to be written.

Return value

This function returns TRUE if it succeeds; otherwise, it returns FALSE. When the function returns FALSE, you can call GetLastError to get the corresponding Win32 system error code.

Requirements

Requirement Value
Header msdelta.h
DLL msdelta.dll
Unicode Not applicable

See also

MSDelta

DeltaFree