unsigned char* in C++ with byte() in VB.Net

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Hi all!
I have create a model server/client (TCP/IP, Socket) through LAN.
So, Server is developed by MFC application
Client by VB.Net
It's is connect, wait,send,revice and end , that's OK
so, data send and revice is error.
at client, message show memory is throw, data send OK but server not is read them.
I think it is error by variable unsigned char* in C++ (packet type server) with
byte() in VB.Net(packet type client)
So, i don't know, how to fix it.
Can help me a good solution, idea.
Thanks so much!

Posted 31-Jul-13 21:27pm

dev C plus

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KarstenK · Answer 1 · 2013-07-31T21:44:00

Solution 1

allocate a byte buffer in VB an let C++ fill the bytes. Use the length as parameter to avoid buffer overruns.

i wolud write code like that:

in vb.net

VB

Dim buffer(200) as Byte
Call_C_Plus_Plus(buffer,200)

in c++

C++

int Call_C_Plus_Plus(char *buffer. in len)
{
 strncpy( buffer, my_c_message, 200);
}

Posted 31-Jul-13 21:44pm

KarstenK

Updated 31-Jul-13 22:37pm

v2

Comments

dev C plus 1-Aug-13 4:24am

yes, i have do it! So, result is same old time!
Client : redim packetRev (lenghtPacket-1)
Server : unsign long ulSize

KarstenK 1-Aug-13 4:38am

i didnt understand your message. So I added some sample code.