void TcpConnect: : sendMessage () 
{
//test header information 
VideoHead video_head; 
Video_head. Set_type (1); 
Video_head. Set_fps (29); 
Video_head. Set_numframe (100); 
Char c_head [100]. 
Memset (c_head, '0', sizeof (c_head)); 
Video_head. SerializePartialToArray (c_head, 100); 
Tcp_socket - & gt; Write (c_head, 100); 
Tcp_socket - & gt; Flush (); 
if(! Tcp_socket - & gt; WaitForBytesWritten (3000)) 
{
QMessageBox: : about (NULL, "Tcp error", "send error!" ); 
} 
QDebug () & lt; 
} 

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Hello, problem solved? I also met the same problem, hope to be able to get more information,

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To ask, and answer