C++ | TCP - receive

C++ | TCP - receive

本文关键字：receive TCP C++      更新时间：2023-10-16

我需要帮助...我花了很多时间编写TCP连接以将图像从服务器传输到客户端。

问题是，看起来客户端没有收到所有字节。

服务器输出：

Anfrage erhalten: img_size...Imagesize sended!
Anfrage erhalten: image...Start
1024 bytes send (1)
2048 bytes send (2)
3072 bytes send (3)
...

客户端输出：

Get Imagesize: 75186 bytes
(0) 75186 
(0) (0/75186)
(1) (5/75186)
(2) (80/75186)
.
.
.
(16150/75186)
(16227/75186)

此时此刻，客户永远等待...如果发送了数字 (1(，则接收数字 (1( 的字节为 5 个字节?!?!?!嘿嘿？

这是我的客户端代码：

tcp.Send( "image" );
msg = "";
while( msg.length() < size_img ){
cout << "(" << msg.length() << "/" << size_img << ")" << endl;
if( msg.length() + 1024 < size_img ){
g = tcp.receive(1024);
}else{
g = tcp.receive(size_img - msg.length());
}
ss << msg;
ss << g;
msg = ss.str();
ss.str("");
}
string TCPClient::receive(int size)
{
char buffer[size];
memset(&buffer[0], 0, sizeof(buffer));
size_t len = sizeof(buffer);
char *p = buffer;
ssize_t n;
string reply;
while(len > 0 && (n=recv(sock,p,len,0)) > 0){
p += n;
len -= (size_t)n;
}
if ( len > 0 || n < 0 ) {
cout << "receive failed!" << endl;
return nullptr;
}
//buffer[size-1]='';
reply = buffer;
return reply;
}

服务器发送功能：

void TCPServer::Send_Bytes(unsigned char* msg, int laenge)
{
for(int i = 0; i < laenge; i=i+1024){
if(i+1024 < laenge){
send(newsockfd,msg+i,1024,0);
}else{
send(newsockfd,msg+i,laenge - i,0);
break;
}
cout << i << endl;
usleep(100000);
}
}

请帮帮我...我不知道该怎么做?!?!?

雅各布斯;)

解决方案：

void TCPClient::receive_char(char* outStr, int size){
char buffer[size];
memset(&buffer[0], 0, sizeof(buffer));
size_t len = sizeof(buffer);
char *p = buffer;
ssize_t n;
while(len > 0 && (n=recv(sock,p,len,0)) > 0){
p += n;
len -= (size_t)n;
}
if ( len > 0 || n < 0 ) {
cout << "receive failed!" << endl;
}
//buffer[size-1]='';
for(int i=0; i < size; ++i){
outStr[i] = buffer[i];
}   
}

您可以通过以下方式致电：

char data[4096];
memset(&data[0], 0, sizeof(data));
tcp.receive_char(data,4096);
for(int i = 0; i < 4096; i++){
image_bytes[counter] = data[i];
counter++;
}

也许有更好的解决方案... :D

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