在 SFML 论坛中未能获得任何帮助后，我决定看看这里是否有人可以提供帮助。我有一个应用程序，它通过与服务器应用程序的 TCP 连接进行自我更新。这工作得很好，除了一个特定的数据包传输，其中数据包以某种方式改变。服务器发送一个包含数字 1 的数据包：
pack << sf::Uint8(1);
ClientSocket.Send(pack);
（其中packsf::PacketClientSocket类型和 sf::SocketTCP 类型）
使用我的调试器单步执行实际上确实确认了这些行已执行，并且我的客户端中的下一个 Receive 调用是接下来的几行：
sock.Receive(pack);
sf::Uint8 conf;
pack >> conf;
（这里pack又是一个 sf::Packet，sock是一个 SocketTCP）
但是，不知何故，在我的客户端中，conf 显示为具有零值（我的调试器确认了这一点）并且它确实如此（下一行根据值切换）。我在同一台机器上运行这两个应用程序，并且它们都将彼此读取为“127.0.0.1”，因此数据包（如果我理解正确的话）不会通过我的路由器，或者真的不会离开我的机器。关于为什么我的数据包被损坏的任何想法？
作为记录，如果有任何帮助，我正在使用 SFML 1.6 和我的应用程序在 Debian Squeeze Linux 机器上运行。
编辑：根据请求，这是我的应用程序中的更多代码。
首先，我的客户与此更新程序特别相关的部分：
cout << "Connecting to update server." << endl;
sf::IpAddress server = sf::IpAddress::LocalHost;
sf::TcpSocket sock;
if (sock.connect(server, PORT, sf::seconds(20.0f)) != sf::Socket::Done)
return false;
cout << "Connected. Searching for updates for updater." << endl;
sf::Packet pack;
std::string lastUpdate = getLastUpdate();
#ifdef __WXGTK__
pack << "uupdate" << lastUpdate << sf::Uint8(1);
#elif defined(__WXMSW__)
pack << "uupdate" << lastUpdate << sf::Uint8(2);
#elif defined(__WXOSX__)
pack << "uupdate" << lastUpdate << sf::Uint8(3);
#endif
sock.send(pack);
pack.clear();
sock.receive(pack); //THIS IS THE PART WHERE IT BREAKS
sf::Int32 conf;
pack >> conf;
if (conf == 1) { //There is an update!
cout << "Update found!" << endl;
pack << "begin" << sf::Uint32(512);
sock.send(pack);
pack.clear();
sock.receive(pack);
pack >> conf;
if (conf == 0) { //No errors
wxFileOutputStream* out = new wxFileOutputStream(wxString(UPDATER, StrConv).append(".temp"));
char* data = new char[512];
while (data != chara("done") && data != chara("error")) {
sock.receive(pack);
sf::Int32 size;
pack >> size;
data = const_cast<char*>((const char*)pack.getData());
out->Write(data, size);
}
out->Close();
if (data == chara("done"))
wxCopyFile(wxString(UPDATER, StrConv).append(".temp"), wxString(UPDATER, StrConv));
wxRemoveFile(wxString(UPDATER, StrConv).append(".temp"));
}
}
cout << "Updater is up-to-date. Executing updater." << endl;
sock.disconnect();
bool success;
if (wxTheApp->argc == 1)
success = wxExecute(wxT(UPDATER));
else
success = wxExecute(wxString(UPDATER, StrConv).append(wxTheApp->argv[1]));
return success;
然后是与这些更新相关的服务器部分：
//ClientSocket has already been initalised by way of a TcpListener
cout << "Checking for updater patches for client at " << ClientAddress.toString() << endl;
std::string lastUpdate;
pack >> lastUpdate;
sf::Uint8 os;
pack >> os;
//Check last time updater was changed
struct tm* clock;
struct stat attribs;
if (os == 1)
stat("Linux/Updater", &attribs);
else if (os == 2)
stat("Windows/Updater.exe", &attribs);
else if (os == 3)
stat("Mac/Updater", &attribs);
clock = gmtime(&(attribs.st_mtime));
time_t lastWrite = mktime(clock);
time_t clientUpdate = stringToNumber<time_t>(lastUpdate.c_str());
if (lastWrite > clientUpdate) {
cout << "Found updater patches for client at " << ClientAddress.toString() << endl;
pack << sf::Int32(1);
ClientSocket->send(pack); //THIS IS THE PART WHERE IT BREAKS
pack.clear();
ClientSocket->receive(pack);
std::string mes;
pack >> mes;
if (mes != "begin") {
cerr << "Client at " << ClientAddress.toString() << " sent unrecognised message: " << mes << ". Ending conversation." << endl;
ClientSocket->disconnect();
return false;
}
sf::Uint32 size;
pack >> size;
cout << "Beginning to send updater patch to " << ClientAddress.toString() << endl;
ifstream in;
if (os == 1)
in.open(chara("Linux/Updater"), ios_base::in | ios_base::binary);
else if (os == 2)
in.open(chara("Windows/Updater.exe"), ios_base::in | ios_base::binary);
else if (os == 3)
in.open(chara("Mac/Updater"), ios_base::in | ios_base::binary);
if (in.fail()) {
pack << sf::Uint8(1);
ClientSocket->send(pack);
cerr << "Failed to open updater at request of " << ClientAddress.toString() << ". Closing connection." << endl;
ClientSocket->disconnect();
return false;
}
pack << sf::Uint8(0);
ClientSocket->send(pack);
pack.clear();
//Get length of file
in.seekg(0, ios::end);
int length = in.tellg();
in.seekg(0, ios::end);
char* buf = new char[size];
for (unsigned int i = 0; i < length / size; i++) { //Read and send every `size`-sized block we can
in.read(buf, size);
pack << sf::Int32(size) << buf;
ClientSocket->send(pack);
}
in.read(buf, length % size);
pack << sf::Int32(length % size) << buf;
ClientSocket->send(pack);
pack.clear();
pack << "done";
ClientSocket->send(pack);
pack.clear();
} else {
pack << sf::Int8(0);
ClientSocket->send(pack);
}
编辑：我知道自从这里有任何帖子以来已经快一个月了，但我仍然对此有疑问。我对如何解决这个问题束手无策。