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How to transfer the data less Report Count?

clark hsu

I want to use win lib(WDK) to transfer data to USB.

The Report Count was defined 8 byte. I need to send the data which has different length(3~8 byte) in the same Report ID. Can I send data less 8 byte? I use SendReport API to write data. Only transfer 8 byte will success. How can I solve this problem?