Question

我正在通过TCP从LabVIEW向此C程序发送单帧（160x120）来测试字节顺序。我设法将字节转换为uint32像素值，但问题是循环重复在控制台应用程序中打印接收的数据。这里的要点是，我将打印收到的19200（160x120）uint32值并停止打印该值，以便我可以检查帧的像素值。那可能吗？。代码：（我试图在for循环中将“len”更改为“160 * 120”，但我在控制台中得到了一些奇怪的值）。

int main(int argc , char *argv[])
{
WSADATA wsa;
SOCKET s , new_socket;
struct sockaddr_in server , client;
int c;
int iResult;
int receivedCount = 0;
char recvbuf[DEFAULT_BUFLEN];
int recvbuflen = DEFAULT_BUFLEN;
typedef unsigned int uint8_t;
unsigned int i;
size_t len;
uint8_t* p;
uint8_t value;

p = (uint8_t*)((void*)recvbuf);

do
{
  iResult = recv( new_socket, recvbuf, recvbuflen, 0);
  len = iResult/sizeof(uint8_t);

  for(i=0; i<len; i++)
    {
    value = p[i];
    printf("%lu\n",value);  
    }
}
while( iResult > 0 );

closesocket(new_socket);
WSACleanup();
}

Answer 1

要合并我的评论，以下是我将如何重写您的代码：

int main(int argc, char *argv[]) {
  WSADATA wsa;
  SOCKET s, new_socket;
  struct sockaddr_in server, client;
  int c, iResult, receivedCount = 0;
  unsigned long totalReceived = 0, totalExpected=160*120;
  char recvbuf[DEFAULT_BUFLEN];
  int recvbuflen = DEFAULT_BUFLEN;
  typedef unsigned int uint8_t;
  uint8_t i, value;
  size_t len;
  uint8_t* p;

  p = (uint8_t*)recvbuf;

  do {
    iResult = recv(new_socket, recvbuf, recvbuflen, 0);
    len = iResult/sizeof(uint8_t);

    for (i=0; i<len; i++) {
      value = p[i];
      totalReceived++;
      printf("%lu\n", value);
      if (totalReceived >= totalExpected) {
        printf("Retrieved expected data\n");
      }
    }
  } while (iResult > 0);

  if (totalReceived < totalExpected) {
    printf("Received less than expected: %lu < %lu\n", totalReceived, totalExpected);
  }

  closesocket(new_socket);
  WSACleanup();
}

这包括“双重投射”更改，并在多个recv来电中捕获收到的数据。

在Winsock中为recv（）执行while循环

1 个答案: