diffApply (Function)

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diffApply (Function)

In french: diffApplique

Applies a difference buffer to a specific buffer. The difference buffer was created by diffCreate.

This function can be useful when updating a file by Internet: all you have to do is send the difference file and apply it when it is received.

Versions 18 and later

This function is now available in Windows Store apps mode.

New in version 18

This function is now available in Windows Store apps mode.

Versions 19 and later

This function is now available in the code of stored procedures.

New in version 19

This function is now available in the code of stored procedures.

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Example

MySourceString is string = "abcde"
MyEndString is string = "abcdef"
MyDifferenceBuffer is Buffer
MyDifferenceBuffer = diffCreate(MySourceString, MyEndString, diffText)
MyDecodeBuffer is Buffer
MyDecodeBuffer = diffApply(MySourceString, MyDifferenceBuffer)
// MyDecodeBuffer = MyEndString

SourceBuffer is Buffer
EndBuffer is Buffer
// Load the buffers
// ..
MyDifferenceBuffer is Buffer
MyDifferenceBuffer = diffCreate(SourceBuffer, EndBuffer, diffBinary)
MyDecodeBuffer is Buffer
MyDecodeBuffer = diffApply(SourceBuffer, MyDifferenceBuffer)

Syntax

<Result> = diffApply(<Buffer to Process> , <Difference Buffer>)

<Result>: Buffer variable

Result once the difference buffer has been applied. This result can correspond to:
the new buffer sought.
an empty buffer if an error occurred. In this case, the ErrorOccurred variable is set to True.

<Buffer to Process>: Buffer variable

Name of buffer to process.

<Difference Buffer>: Buffer variable

Name of the difference buffer that must be applied to <Buffer to Process>. This buffer was created by diffCreate.

Remarks

Error cases

Applying the difference buffer may fail in the following cases:

The difference buffer does not use a recognized format.
<Buffer to Process> is not the buffer from which the difference buffer was created.
The result does not correspond to the buffer that must be found (internal check).

Component : wd240std.dll