[ Version ( since = "2.40" ) ]
public bool vprintf (out size_t bytes_written, Cancellable? cancellable, string format, va_list args) throws Error
This is a utility function around write_all.
It uses vprintf to turn
args into a string
that is then written to this.
See the documentation of write_all about the behavior of the actual write operation.
Note that partial writes cannot be properly checked with this function due to the variable length of the written string, if you need precise control over partial write failures, you need to create you own printf-like wrapper around write or write_all.
location to store the number of bytes that was written to the stream
optional Cancellable object, null to ignore.
the format string. See the printf documentation
the parameters to insert into the format string
location to store the error occurring, or null to ignore
true on success, false if there was an error