Socket programming using the send send structure-CodePudding

Socket programming using the send send structure
Structure before body with four synchronization characters, synchronous character as hexadecimal number 16 SYN (ASCII), ah, how to understand this sentence)

 struct TabFLogin {
BYTE Reserved; 
BYTE LenTab; 
BYTE TSCLinkCode; 
BYTE RetSIDE; 
BYTE TSC_Id; 
}; 



Struct TabFLogin TabFLogin_1; 
TabFLogin_1. LenTab=5; 
TabFLogin_1. TSCLinkCode=103; 
TabFLogin_1. RetSIDE=1; 
TabFLogin_1. TSC_Id=3; 
Char send_buf [1024]. 
Memset (send_buf, 0102, 4); 
Memcpy (send_buf, & amp; TabFLogin_1, sizeof (TabFLogin_1)); 
ClientSocket - & gt; The Socket - & gt; SendBuf (send_buf, 0);

CodePudding user response:

Send_buf before four bytes 0 x16, send_buf + 4 to structure content,

CodePudding user response:

reference 1st floor u010165006 response:

send_buf before four bytes 0 x16, send_buf + 4 to structure content,

How to write, thank you

CodePudding user response:

refer to the second floor Leighf response:

Quote: refer to 1st floor u010165006 response:

Send_buf before four bytes 0 x16, send_buf + 4 to structure content,

How to write, thank you

for(int i=0; i<4. I++)
* ((char *) (send_buf + I))=0 x16;
Memcpy (send_buf + 4, & amp; TabFLogin_1, sizeof (TabFLogin_1));
Handwriting verification, you give it a try,

CodePudding user response:

for(int i=0; i<4. I++)
Send_buf [I]=0 x16 (char);
Ok, send_buf array is the char type,

CodePudding user response:

7 integer input to the minimum and maximum number first exchange with the last number, then output exchange after seven digits

CodePudding user response:

The original poster can try the following written as, with a big structure to include small structure

 struct TabFLogin {
BYTE Reserved; 
BYTE LenTab; 
BYTE TSCLinkCode; 
BYTE RetSIDE; 
BYTE TSC_Id; 
}; 
Struct SendBufData {
BYTE syn [4]. 
Struct TabFLogin data; 
}; 
Struct SendBufData TabFLogin_1; 
Memset (TabFLogin_1 syn, 0 x16, 4);//fill the SYN data 
TabFLogin_1. Data. LenTab=5; 
TabFLogin_1. Data. TSCLinkCode=103; 
TabFLogin_1. Data. RetSIDE=1; 
TabFLogin_1. Data. TSC_Id=3; 
Char send_buf [1024]. 
Memset (send_buf, 0102, 4); 
Memcpy (send_buf, & amp; TabFLogin_1, sizeof (TabFLogin_1)); 
ClientSocket - & gt; The Socket - & gt; SendBuf (send_buf, 0);