'getaddrinfo': 找不到标识符
'getaddrinfo': identifier not found
我在 Visual Studio 2017 年开始使用 C++ 在 Windows 7 上进行 WinSock 2 编程。我正在尝试在此处获取 winsock 客户端示例代码和 运行:https://msdn.microsoft.com/en-us/library/windows/desktop/ms737591(v=vs.85).aspx
我不得不删除 windows.h 包含以删除一大堆错误,但有 2 个我无法删除(彼此相关)。当我尝试构建时,收到以下错误消息:
C3861 freeaddrinfo': identifier not found
C3861 getaddrinfo': identifier not found
令人沮丧的是,visual studio 似乎能够解析这些引用。从代码中,我可以右键单击->转到定义,这两个错误都没有任何问题。我正在链接到 ws2_32.lib,所以这也不是问题所在。我在 Windows XP 或更早版本的搜索中遇到过此问题的其他实例,例如这个 。但我使用的是 Windows 7,所以 OS 兼容性应该不是问题。我也试过包括 ws2tcpip.h 和 wspiapi.h,但这没有帮助。
为了完整起见,这里是我的所有代码:
#include <ws2tcpip.h>
#include <wspiapi.h>
#include <stdlib.h>
#include <stdio.h>
#include "stdafx.h"
// Need to link with Ws2_32.lib, Mswsock.lib, and Advapi32.lib
#pragma comment (lib, "Ws2_32.lib")
#pragma comment (lib, "Mswsock.lib")
#pragma comment (lib, "AdvApi32.lib")
#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "27015"
int __cdecl main(int argc, char **argv)
{
WSAData wsaData;
SOCKET ConnectSocket = INVALID_SOCKET;
struct addrinfo *result = NULL,
*ptr = NULL,
hints;
char *sendbuf = "this is a test";
char recvbuf[DEFAULT_BUFLEN];
int iResult;
int recvbuflen = DEFAULT_BUFLEN;
// Validate the parameters
if (argc != 2) {
printf("usage: %s server-name\n", argv[0]);
return 1;
}
// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (iResult != 0) {
printf("WSAStartup failed with error: %d\n", iResult);
return 1;
}
ZeroMemory(&hints, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
// Resolve the server address and port
iResult = getaddrinfo(argv[1], DEFAULT_PORT, &hints, &result);
if (iResult != 0) {
printf("getaddrinfo failed with error: %d\n", iResult);
WSACleanup();
return 1;
}
// Attempt to connect to an address until one succeeds
for (ptr = result; ptr != NULL; ptr = ptr->ai_next) {
// Create a SOCKET for connecting to server
ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype,
ptr->ai_protocol);
if (ConnectSocket == INVALID_SOCKET) {
printf("socket failed with error: %ld\n", WSAGetLastError());
WSACleanup();
return 1;
}
// Connect to server.
iResult = connect(ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
if (iResult == SOCKET_ERROR) {
closesocket(ConnectSocket);
ConnectSocket = INVALID_SOCKET;
continue;
}
break;
}
freeaddrinfo(result);
if (ConnectSocket == INVALID_SOCKET) {
printf("Unable to connect to server!\n");
WSACleanup();
return 1;
}
// Send an initial buffer
iResult = send(ConnectSocket, sendbuf, (int)strlen(sendbuf), 0);
if (iResult == SOCKET_ERROR) {
printf("send failed with error: %d\n", WSAGetLastError());
closesocket(ConnectSocket);
WSACleanup();
return 1;
}
printf("Bytes Sent: %ld\n", iResult);
// shutdown the connection since no more data will be sent
iResult = shutdown(ConnectSocket, SD_SEND);
if (iResult == SOCKET_ERROR) {
printf("shutdown failed with error: %d\n", WSAGetLastError());
closesocket(ConnectSocket);
WSACleanup();
return 1;
}
// Receive until the peer closes the connection
do {
iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
if (iResult > 0)
printf("Bytes received: %d\n", iResult);
else if (iResult == 0)
printf("Connection closed\n");
else
printf("recv failed with error: %d\n", WSAGetLastError());
} while (iResult > 0);
// cleanup
closesocket(ConnectSocket);
WSACleanup();
return 0;
}
还有我的 stdafx.h 文件:
// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently, but
// are changed infrequently
//
#pragma once
#include "targetver.h"
#include <stdio.h>
#include <tchar.h>
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include <WinSock2.h>
#pragma comment(lib, "WS2_32.lib")
// TODO: reference additional headers your program requires here
如有任何想法,我们将不胜感激。
您的 header 顺序错误。 #include "stdafx.h"
应该始终是 .c 或 .cpp 文件的第一个 header 包含。 (使用预编译的 headedrs 时)。
这是 stdafx.h 所需要的:
#pragma once
#include "targetver.h"
#include <ws2tcpip.h> // includes <winsock2.h> implicitly which in turn includes <windows.h>
#include <stdlib.h>
#include <stdio.h>
主源文件顶部需要的内容:
#include "stdafx.h"
// Need to link with Ws2_32.lib
#pragma comment (lib, "Ws2_32.lib")
#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "27015"
int __cdecl main(int argc, char **argv)
{
...
我在 Visual Studio 2017 年开始使用 C++ 在 Windows 7 上进行 WinSock 2 编程。我正在尝试在此处获取 winsock 客户端示例代码和 运行:https://msdn.microsoft.com/en-us/library/windows/desktop/ms737591(v=vs.85).aspx
我不得不删除 windows.h 包含以删除一大堆错误,但有 2 个我无法删除(彼此相关)。当我尝试构建时,收到以下错误消息:
C3861 freeaddrinfo': identifier not found
C3861 getaddrinfo': identifier not found
令人沮丧的是,visual studio 似乎能够解析这些引用。从代码中,我可以右键单击->转到定义,这两个错误都没有任何问题。我正在链接到 ws2_32.lib,所以这也不是问题所在。我在 Windows XP 或更早版本的搜索中遇到过此问题的其他实例,例如这个
为了完整起见,这里是我的所有代码:
#include <ws2tcpip.h>
#include <wspiapi.h>
#include <stdlib.h>
#include <stdio.h>
#include "stdafx.h"
// Need to link with Ws2_32.lib, Mswsock.lib, and Advapi32.lib
#pragma comment (lib, "Ws2_32.lib")
#pragma comment (lib, "Mswsock.lib")
#pragma comment (lib, "AdvApi32.lib")
#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "27015"
int __cdecl main(int argc, char **argv)
{
WSAData wsaData;
SOCKET ConnectSocket = INVALID_SOCKET;
struct addrinfo *result = NULL,
*ptr = NULL,
hints;
char *sendbuf = "this is a test";
char recvbuf[DEFAULT_BUFLEN];
int iResult;
int recvbuflen = DEFAULT_BUFLEN;
// Validate the parameters
if (argc != 2) {
printf("usage: %s server-name\n", argv[0]);
return 1;
}
// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (iResult != 0) {
printf("WSAStartup failed with error: %d\n", iResult);
return 1;
}
ZeroMemory(&hints, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
// Resolve the server address and port
iResult = getaddrinfo(argv[1], DEFAULT_PORT, &hints, &result);
if (iResult != 0) {
printf("getaddrinfo failed with error: %d\n", iResult);
WSACleanup();
return 1;
}
// Attempt to connect to an address until one succeeds
for (ptr = result; ptr != NULL; ptr = ptr->ai_next) {
// Create a SOCKET for connecting to server
ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype,
ptr->ai_protocol);
if (ConnectSocket == INVALID_SOCKET) {
printf("socket failed with error: %ld\n", WSAGetLastError());
WSACleanup();
return 1;
}
// Connect to server.
iResult = connect(ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
if (iResult == SOCKET_ERROR) {
closesocket(ConnectSocket);
ConnectSocket = INVALID_SOCKET;
continue;
}
break;
}
freeaddrinfo(result);
if (ConnectSocket == INVALID_SOCKET) {
printf("Unable to connect to server!\n");
WSACleanup();
return 1;
}
// Send an initial buffer
iResult = send(ConnectSocket, sendbuf, (int)strlen(sendbuf), 0);
if (iResult == SOCKET_ERROR) {
printf("send failed with error: %d\n", WSAGetLastError());
closesocket(ConnectSocket);
WSACleanup();
return 1;
}
printf("Bytes Sent: %ld\n", iResult);
// shutdown the connection since no more data will be sent
iResult = shutdown(ConnectSocket, SD_SEND);
if (iResult == SOCKET_ERROR) {
printf("shutdown failed with error: %d\n", WSAGetLastError());
closesocket(ConnectSocket);
WSACleanup();
return 1;
}
// Receive until the peer closes the connection
do {
iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
if (iResult > 0)
printf("Bytes received: %d\n", iResult);
else if (iResult == 0)
printf("Connection closed\n");
else
printf("recv failed with error: %d\n", WSAGetLastError());
} while (iResult > 0);
// cleanup
closesocket(ConnectSocket);
WSACleanup();
return 0;
}
还有我的 stdafx.h 文件:
// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently, but
// are changed infrequently
//
#pragma once
#include "targetver.h"
#include <stdio.h>
#include <tchar.h>
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include <WinSock2.h>
#pragma comment(lib, "WS2_32.lib")
// TODO: reference additional headers your program requires here
如有任何想法,我们将不胜感激。
您的 header 顺序错误。 #include "stdafx.h"
应该始终是 .c 或 .cpp 文件的第一个 header 包含。 (使用预编译的 headedrs 时)。
这是 stdafx.h 所需要的:
#pragma once
#include "targetver.h"
#include <ws2tcpip.h> // includes <winsock2.h> implicitly which in turn includes <windows.h>
#include <stdlib.h>
#include <stdio.h>
主源文件顶部需要的内容:
#include "stdafx.h"
// Need to link with Ws2_32.lib
#pragma comment (lib, "Ws2_32.lib")
#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "27015"
int __cdecl main(int argc, char **argv)
{
...