c_g_data_output_stream_put_uint32

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
gboolean function(GDataOutputStream* stream, guint32 data, GCancellable* cancellable, GError** error) c_g_data_output_stream_put_uint32;

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