ZipCrc VB.NET Reference Documentation

ZipCrc

Current Version: 9.5.0.73

Calculate a Zip CRC checksum for a file or in-memory data.

Object Creation

Dim obj As New Chilkat.ZipCrc()

Properties

LastMethodSuccess
LastMethodSuccess As Boolean

Indicate whether the last method call succeeded or failed. A value of True indicates success, a value of False indicates failure. This property is automatically set for method calls. It is not modified by property accesses. The property is automatically set to indicate success for the following types of method calls:

  • Any method that returns a string.
  • Any method returning a Chilkat object, binary bytes, or a date/time.
  • Any method returning a standard boolean status value where success = True and failure = False.
  • Any method returning an integer where failure is defined by a return value less than zero.

Note: Methods that do not fit the above requirements will always set this property equal to True. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

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Methods

BeginStream
Sub BeginStream()

Provides a way to calculate a CRC by streaming the data a chunk at a time. An application would start by calling BeginStream. Then it would add data by calling MoreData for each additional chunk. After the last chunk has been processed, the EndStream method is called to return the CRC.

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CalculateCrc
Function CalculateCrc(ByVal data As Byte()) As UInteger

Calculates a 32-bit CRC for in-memory byte data. This is the 32-bit CRC that would be found in a Zip file header if a file containing the data was added to a zip archive. Returns the CRC32 of the data.

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EndStream
Function EndStream() As UInteger

Finalizes and returns the Zip CRC value calculated by calling BeginStream followed by multiple calls to MoreData.

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FileCrc
Function FileCrc(ByVal path As String) As UInteger

Calculates the CRC32 of a file. The data contained in the file is streamed for the calculation to keep the memory footprint small and constant. Returns the CRC32 of the file.

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FileCrcAsync (1)
Function FileCrcAsync(ByVal path As String) As Task

Creates an asynchronous task to call the FileCrc method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nothing on failure

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MoreData
Sub MoreData(ByVal data As Byte())

Adds additional data to the CRC currently being calculated. (See BeginStream for more information.)

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ToHex
Function ToHex(ByVal crc As Integer) As String

Converts a 32-bit integer to a hex string.

Returns Nothing on failure

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Events

AbortCheck
Event OnAbortCheck

Provides the opportunity for a method call to be aborted. The AbortCheck event is fired periodically based on the value of the HeartbeatMs property. If HeartbeatMs is 0, then no AbortCheck events will fire. As an example, to fire 5 AbortCheck events per second, set the HeartbeatMs property equal to 200.

Args are passed using Chilkat.AbortCheckEventArgs

Event callback implementation:

Dim WithEvents zipcrc As Chilkat.ZipCrc

Private Sub zipcrc_OnAbortCheck(sender As Object, args As Chilkat.AbortCheckEventArgs) Handles zipcrc.OnAbortCheck

    ...

End Sub
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PercentDone
Event OnPercentDone

Provides the percentage completed for any method that involves network communications or time-consuming processing (assuming it is a method where a percentage completion can be measured). This event is only fired when it is possible to know a percentage completion, and when it makes sense to express the operation as a percentage completed. The pctDone argument will have a value from 1 to 100. For operations (Chilkat method calls) that complete very quickly, the number of PercentDone callbacks will vary, but the final callback should have a value of 100. For long running operations, no more than one callback per percentage point will occur (for example: 1, 2, 3, ... 98, 99, 100).

The PercentDone callback counts as an AbortCheck event. For method calls that complete quickly such that PercentDone events fire, it may be that AbortCheck events don't fire because the opportunity to abort is already provided in the PercentDone callback. For time consuming operations, where the amount of time between PercentDone callbacks are long, AbortCheck callbacks may be used to allow for the operation to be aborted in a more responsive manner.

The abort output argument provides a means for aborting the operation. Setting it to True will cause the method to abort and return a failed status (or whatever return value indicates failure).

Args are passed using Chilkat.PercentDoneEventArgs

Event callback implementation:

Dim WithEvents zipcrc As Chilkat.ZipCrc

Private Sub zipcrc_OnPercentDone(sender As Object, args As Chilkat.PercentDoneEventArgs) Handles zipcrc.OnPercentDone

    ...

End Sub
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ProgressInfo
Event OnProgressInfo

A general name/value event that provides information about what is happening during a method call. To find out what information is available, write code to handle this event and log the name/value pairs. Most are self-explanatory.

Args are passed using Chilkat.ProgressInfoEventArgs

Event callback implementation:

Dim WithEvents zipcrc As Chilkat.ZipCrc

Private Sub zipcrc_OnProgressInfo(sender As Object, args As Chilkat.ProgressInfoEventArgs) Handles zipcrc.OnProgressInfo

    ...

End Sub
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TaskCompleted
Event OnTaskCompleted

Called in the background thread when an asynchronous task completes.

More Information and Examples

Args are passed using Chilkat.TaskCompletedEventArgs

Event callback implementation:

Dim WithEvents zipcrc As Chilkat.ZipCrc

Private Sub zipcrc_OnTaskCompleted(sender As Object, args As Chilkat.TaskCompletedEventArgs) Handles zipcrc.OnTaskCompleted

    ...

End Sub
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