Function DdeClientTransaction 

pub unsafe extern "system" fn DdeClientTransaction(
    pdata: *const u8,
    cbdata: u32,
    hconv: *mut c_void,
    hszitem: *mut c_void,
    wfmt: u32,
    wtype: u32,
    dwtimeout: u32,
    pdwresult: *mut u32,
) -> *mut c_void