这是第一次使用 libsigc++ 作为信号槽,我有两个工作正常的函数,我的场景:我写了一个布尔函数,如果套接字有数据用于接收,它返回 true:
bool Socket::isDataReady()
{
void *buffer = malloc (FRAMEBUFFER + 6);
sockaddr_in from;
socklen_t fromLength = sizeof( from );
if (::recvfrom(this->socketFD,buffer,FRAMEBUFFER + 6, 0, (sockaddr *)&this->getSocketAddressStructureOfServer(), &fromLength ) == -1)
{
if (errno == EAGAIN || errno == EWOULDBLOCK)
return false;
}
return true;
}
所以,我写了一个从网络获取数据的函数:
int Socket::readDatagrams(unsigned char *buffer, string &srcAddress, unsigned short int & srcPort)
{
unsigned int maximumPacketSize = FRAMEBUFFER + 6;
int returnValue ;
sockaddr_in from;
socklen_t fromLength = sizeof( from );
int receivedBytes;
fromLength = sizeof(this->getSocketAddressStructureOfServer());
receivedBytes = recvfrom( this->socketFD, buffer, maximumPacketSize, 0, (sockaddr *)&this->getSocketAddressStructureOfServer(), &fromLength );
returnValue = receivedBytes;
if ( receivedBytes <= 0 )
returnValue = -1;
/// exporting data
//
srcAddress = inet_ntoa(this->getSocketAddressStructureOfServer().sin_addr);
srcPort = ntohs( ( unsigned short int)this->getSocketAddressStructureOfServer().sin_port );
return returnValue;
}
我有 UDP 服务器并在构造函数中初始化所有内容,所以我需要告诉 isDataReady() 何时为真,readDatagram 本身执行。如何用 libsigc++ 编写代码?我读了他们的教程,但是它的教程并没有说 func as sig。