Writing an Application that Requests Filtering

Go Up to Filtering Blob Data

To request filtering of Blob data as it is read from or written to a Blob, follow these steps in your application:

1. Create a Blob parameter buffer (BPB) specifying the source and target subtypes, and optionally character sets (for TEXT subtypes).
2. Call either isc_open_blob2() or isc_create_blob2() to open a Blob for read or write access, respectively. In the call, pass the BPB, whose information InterBase will use to determine which filter should be called.

Topics

• Understanding the Blob Parameter Buffer
• Generating a Blob Parameter Buffer Using API Calls
• Generating a Blob Parameter Buffer Directly
• Requesting Filter Usage

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• Understanding the Blob Parameter Buffer