Function WsGetCustomHeader
pub unsafe fn WsGetCustomHeader(
message: *const WS_MESSAGE,
customheaderdescription: *const WS_ELEMENT_DESCRIPTION,
repeatingoption: WS_REPEATING_HEADER_OPTION,
headerindex: u32,
readoption: WS_READ_OPTION,
heap: Option<*const WS_HEAP>,
value: *mut c_void,
valuesize: u32,
headerattributes: Option<*mut u32>,
error: Option<*const WS_ERROR>,
) -> Result<()>