WSADATA wsData; int nret=WSAStartup(MAKEWORD(2, 2), &wsData); if(nret!=0) { qDebug() << "WSAStartup failed " << WSAGetLastError(); WSACleanup(); return ; } sockaddr_in sa,recSa; int len = sizeof(sa); sa.sin_family = AF_INET; sa.sin_port = htons(m_nLocalPort); int ret = inet_pton(AF_INET,m_strLocalIP.toUtf8().data(),&sa);//htonl(INADDR_ANY); // 接收任意地址数据 if (ret == 0 || errno == EAFNOSUPPORT) { qDebug()<<"inet_pton "<<WSAGetLastError(); return ; } // char localIP[20]; // qDebug()<<"bind local IP = "<<inet_ntop(AF_INET,&sa,localIP,20)<<" ip:"<<localIP; SOCKET sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if (sock==INVALID_SOCKET) { qDebug()<<"socket failed "<<WSAGetLastError(); return ; } int nres = bind(sock, (sockaddr*)&sa, len); if(nres == -1) { qDebug() << "Failed to bind sockopt: " << WSAGetLastError(); closesocket(sock); WSACleanup(); return ; }bind失败,为什么
时间: 2024-04-07 14:32:51 浏览: 7
bind失败可能有多种原因,常见的有以下几种:
1. 端口被占用:在绑定端口时,如果该端口已经被其他程序占用,那么就会导致bind失败。可以尝试更换端口或者关闭占用该端口的程序。
2. IP地址不正确:在绑定IP地址时,如果指定的IP地址不正确或者不存在,也会导致bind失败。可以检查IP地址是否正确或者使用INADDR_ANY表示接收任意地址数据。
3. 权限不足:在某些操作系统中,绑定低于1024的端口需要管理员权限,如果当前用户没有足够的权限,也会导致bind失败。可以尝试使用高于1024的端口或者切换到具有管理员权限的用户。
4. socket已经处于绑定状态:如果该socket已经绑定了一个地址,那么再次调用bind会导致失败。可以尝试在绑定之前先关闭该socket。
在你的代码中,可能出现bind失败的原因是指定的IP地址不正确或者端口被占用。你可以检查一下绑定的IP地址和端口是否正确,并且确认该端口没有被其他程序占用。
相关问题
WSAStartup(MAKEWORD(2, 2), &wsaData);返回值被忽略
WSAStartup函数用于初始化Winsock库,调用该函数时,需要传入一个WSADATA结构体的指针,用于保存Winsock库的版本信息。在函数调用成功后,WSADATA结构体中的成员变量将被填充。
在使用WSAStartup函数时,需要注意其返回值。如果函数调用成功,返回值为0;否则,返回值为错误代码,可以使用WSAGetLastError函数获取错误代码。因此,在调用WSAStartup函数时,应该检查返回值,以确保函数调用成功。
例如,正确的调用方式如下:
```c
WSADATA wsaData;
int result = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (result != 0) {
// 初始化Winsock库失败
// 进行错误处理
}
```
在调用WSAStartup函数时,如果忽略了其返回值,可能会导致程序无法正常运行,因为Winsock库没有被正确初始化。因此,在使用WSAStartup函数时,应该始终检查其返回值。
int main() { std::map<std::string, std::string> config = readIniFile("config.ini"); int bluetoothCount = std::stoi(config["bluetooth.count"]); std::string logFileName = config["log.filename"]; WSADATA wsaData; int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData); if (iResult != 0) { std::cout << "WSAStartup failed: " << iResult << std::endl; return 1; } WSAQUERYSET service; memset(&service, 0, sizeof(service)); service.dwSize = sizeof(service); service.dwNameSpace = NS_BTH; HANDLE lookupHandle = NULL; iResult = WSALookupServiceBegin(&service, LUP_CONTAINERS, &lookupHandle); if (iResult != 0) { std::cout << "WSALookupServiceBegin failed: " << iResult << std::endl; WSACleanup(); return 1; } int count = 0; while (count < bluetoothCount) { WSAQUERYSET result; memset(&result, 0, sizeof(result)); result.dwSize = sizeof(result); iResult = WSALookupServiceNext(lookupHandle, LUP_RETURN_NAME | LUP_RETURN_ADDR, &result); if (iResult != 0) { break; } count++; } WSALookupServiceEnd(lookupHandle); WSACleanup(); if (count >= bluetoothCount) { std::string logText = "Bluetooth count is " + std::to_string(count) + ", reached the target count of " + std::to_string(bluetoothCount); writeLogFile(logFileName, logText); } else { std::string logText = "Bluetooth count is " + std::to_string(count) + ", did not reach the target count of " + std::to_string(bluetoothCount); writeLogFile(logFileName, logText); } return 0; } &result报错,实参与形参不兼容 怎么修改
可以尝试将代码中的WSAQUERYSET result改为LPWSAQUERYSET result,即使用指向WSAQUERYSET结构体的指针类型,代码如下:
int main() {
std::map<std::string, std::string> config = readIniFile("config.ini");
int bluetoothCount = std::stoi(config["bluetooth.count"]);
std::string logFileName = config["log.filename"];
WSADATA wsaData;
int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (iResult != 0) {
std::cout << "WSAStartup failed: " << iResult << std::endl;
return 1;
}
WSAQUERYSET service;
memset(&service, 0, sizeof(service));
service.dwSize = sizeof(service);
service.dwNameSpace = NS_BTH;
HANDLE lookupHandle = NULL;
iResult = WSALookupServiceBegin(&service, LUP_CONTAINERS, &lookupHandle);
if (iResult != 0) {
std::cout << "WSALookupServiceBegin failed: " << iResult << std::endl;
WSACleanup();
return 1;
}
int count = 0;
while (count < bluetoothCount) {
WSAQUERYSET* result;
memset(&result, 0, sizeof(result));
result->dwSize = sizeof(WSAQUERYSET);
iResult = WSALookupServiceNext(lookupHandle, LUP_RETURN_NAME | LUP_RETURN_ADDR, result);
if (iResult != 0) {
break;
}
count++;
}
WSALookupServiceEnd(lookupHandle);
WSACleanup();
if (count >= bluetoothCount) {
std::string logText = "Bluetooth count is " + std::to_string(count) + ", reached the target count of " + std::to_string(bluetoothCount);
writeLogFile(logFileName, logText);
}
else {
std::string logText = "Bluetooth count is " + std::to_string(count) + ", did not reach the target count of " + std::to_string(bluetoothCount);
writeLogFile(logFileName, logText);
}
return 0;
}