在C ++中删除字符数组的内容

Question

I have initialized a character array as: char Buffer[1000]={0}; In this array, data is received from a socket and displayed Everytime I display the contents of this array, I want to again initilize all its contents to zero. If I don't do that and again read data from the socket using the same array, some old data present in array is also displayed. i used memset() function to again initialize all contents of array with zeros before receiving the data second time, but it didn't work. Is there any other way of doing that in c/c++ ? seeking help :(

Answer 1

The contract for recvfrom doesn't guarantee what happens to the memory in between the end of the message received and the end of the buffer. That's why recvfrom returns the number of valid bytes. The remainder of the buffer is not unchanged, it is overwritten with trash.

Change

memset(receiveBuffer,'\0',1000); 
recv_len = recvfrom(socketIdentifier, receiveBuffer, sizeof(receiveBuffer), 0, (struct sockaddr *) &clientSocket, &clientSocketLength);

to

recv_len = recvfrom(socketIdentifier, receiveBuffer, sizeof(receiveBuffer), 0, (struct sockaddr *) &clientSocket, &clientSocketLength);
if (recv_len > 0)
    memset(receiveBuffer + recv_len, 0, 1000 - recv_len); 

Answer 2

在接收并显示数据后，运行从0到999的循环以重置阵列的内容。