Visual Basic (Declaration) | |
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Public Overloads Sub GetRowCompressed( _ ByVal workBuffer As IntPtr, _ ByVal runBuffer As IntPtr, _ ByVal row As Integer, _ ByVal lines As Integer _ ) |
Visual Basic (Usage) | Copy Code |
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Managed Extensions for C++ | |
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public: void GetRowCompressed( IntPtr workBuffer, IntPtr runBuffer, int row, int lines ) |
Parameters
- workBuffer
- Pointer to optional work unmanaged memory buffer. Allocating the work buffer speeds processing if you call this method more than once, because if you do not allocate a work buffer, the method allocates and frees a temporary buffer each time it is called. bytes required = lines * ((Width + 3) * 2). Pass IntPtr.Zero for workBuffer if you do not want to use the work buffer
- runBuffer
- Pointer to the output unmanaged memory buffer, which will be filled with 1-bit compressed image data.
- row
- The number of the row to retrieve. The first row is 0, and the last row is 1 less than the image height.
- lines
- Number of rows to retrieve.
This example demonstrates the low-level methods for accessing 1-bit compressed image data.
It demonstrates the ability to get and put rows, and the ability to process rows in
buffer-to-buffer processing. The result of the function is an the first 50 lines are inverted.
This method is available in the (Document/Medical only) Toolkits.
This method is useful for working with 1-bit images that are loaded in their compressed formats for faster loading and display.
For more information, refer to Speeding Up 1-Bit Documents.
Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family