Hi,
If you want to convert a Web(http/html) protocol script into TruClient script the answer is no. TruClient is working on a GUI base level and you should record your business process in the TruClient browser.
Using C functions in TruClient should be done only as an exception. If you need to insert some logic in your TruClient script it is better to use JavaScript functions and evaluate JavaScript step.
Link to a document explaining "How to call external C and JavaScript functions in TruClient protocol" and additional information about working with TruClient is available in the following post: http://h30499.www3.hp.com/t5/LoadRunner-Support-Customer/LR-Support-Tip-Ajax-TruClient-Videos-and-knowledge-documents/td-p/6327643
Kind regards,