transfer an unsigned byte

[kabilius]

Hi all,

I don't know how I solve the problem, but the problem magically disappeared.... :/

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Hi all,

I am using C/C++ to construct and transmit packet to a server, and I am having trouble sending the correct byte if the value is greater than decimal 127.

Let's say this is the layout of my packet:

typedef struct
{
BYTE bHeader ;
BYTE bText1 ;
char szText2[ 5 ] ;
char szText3[ 2 ] ;
BYTE bText4 ;
unsigned char cText5 ;
} ClientToServer ;


cText5 may occasionally contain an unsigned value, so I use "unsigned char" as its data type.
When I run through my code in debug mode, I see cText5 is equal to 204, then I send the whole packet with the send() API:


send( sock, ( char* )&ClientToServer , sizeof( ClientToServer ), 0 ) ;


However, when I perform a packet capture, it shows that the last byte I sent, which is cText5, is equal to 1

Does anyone have an idea what I did wrong?

Thank you,
kab

[_Superman_]

I hope what you have done is

ClientToServer cltosv;
...
send( sock, ( char* )&cltosv , sizeof( ClientToServer ), 0 ) ;

You could also try to put #pragma pack(1) before declaring the structure.