SuiteUSB 3.4 has support for C++ and C# only.
For writing host application using C,
After installing SuiteUSB 3.4 you can find CyUSB.pdf at C:\Cypress\Cypress SuiteUSB 3.4.5\Driver\ this discusses the IOCTL interface of CyUSB.sys. You'll have to write a host application to talk to this interface.
Very thanks for the answer!
I tried your tip and it works