Question

我正在尝试将我的wifi连接发送到reciver进行实验。我设法使用Windows API Native for wifi将卡连接到reciver。

我将我的卡的GUID存储在pIfInfo指针（PWLAN_INTERFACE_INFO）中并解压缩以创建应该允许我在连接上写入的句柄（WifiAcess）。

然后，如果我运行这个，我会在envois之前使用和不使用（void *）转换在WriteFile函数上得到错误ERROR_INVALID_PARAMETER。

嗯，我的问题是，我不知道哪个参数无效

DWORD bytesSend;
char *buffer ;
unsigned int nbChar ;

要发送的数据

int headerData[4] = {85,0,11,0};
int ServosData[6] = {100,100,0,100,0,0};

 BYTE * envois = new BYTE[11];

 envois[0] = headerData[0] ;
 envois[1] = headerData[1] ;
 envois[2] = headerData[2] ;
 envois[3] = headerData[3] ;
 envois[4] = ServosData[0] ;
 envois[5] = ServosData[1] ;
 envois[6] = ServosData[2] ;
 envois[7] = ServosData[3] ;
 envois[8] = ServosData[4] ;
 envois[9] = ServosData[5] ;

检查汇总

 for(int i = 0 ; i<10;i++)
 {
     envois[10] = envois[10] + envois[i] ;
 }
 envois[10] = envois[10]%256 ;
 nbChar = 11 ;

 HANDLE WifiAcess = INVALID_HANDLE_VALUE;
 LPCSTR AcessGUID ;
 char GuidString2Char[46] ;
 char DefChar = ' ';
 bool sendtOk = false ;

这里我们从wifi连接获取我们的Wlan卡的GUID

    sprintf(GuidString2Char, "\\\\.\\{%08lX-%04hX-%04hX-%02hhX%02hhX-%02hhX%02hhX%02hhX%02hhX%02hhX%02hhX}",
                        pIfInfo->InterfaceGuid.Data1,
                        pIfInfo->InterfaceGuid.Data2,
                        pIfInfo->InterfaceGuid.Data3,
                        pIfInfo->InterfaceGuid.Data4[0],
                        pIfInfo->InterfaceGuid.Data4[1],
                        pIfInfo->InterfaceGuid.Data4[2],
                        pIfInfo->InterfaceGuid.Data4[3],
                        pIfInfo->InterfaceGuid.Data4[4],
                        pIfInfo->InterfaceGuid.Data4[5],
                        pIfInfo->InterfaceGuid.Data4[6],
                        pIfInfo->InterfaceGuid.Data4[7]);

将已翻译的GUID放入LPCSTR

    AcessGUID = GuidString2Char ;

然后创建句柄

    WifiAcess = CreateFile(
                                AcessGUID ,  
                                GENERIC_READ | GENERIC_WRITE,
                                FILE_SHARE_READ ,
                                NULL,
                                OPEN_EXISTING,
                                FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
                                (HANDLE)INVALID_HANDLE_VALUE); // NULL

检查错误

        if(WifiAcess == INVALID_HANDLE_VALUE)
        {
            dwResult = GetLastError();
            switch(dwResult)
            {
                case ERROR_FILE_NOT_FOUND  :
                        wprintf(L"\t\t\CreateFile ERROR_FILE_NOT_FOUND\n");
                    break ;
                default :
                        wprintf(L"\t\t\CreateFile default\n");
                    break;
            }
        }
        else {  wprintf(L"\t\t\CreateFile Success\n"); }

尝试在WifiAcess Handle上编写缓冲区

        sendtOk = WriteFile(WifiAcess, envois, nbChar, &bytesSend, NULL) ; 
        if(!sendtOk)
        {
            wprintf(L"\n\t\t\tEcheque de l envois : %d bytes envoyes\n\n", bytesSend);
            dwResult = GetLastError();
            switch(dwResult)
            {

/////////////////////////////////////////////// ////////////////////////////////////////////////// ///

                case ERROR_INVALID_PARAMETER  :
                        wprintf(L"\t\t\WriteFile ERROR_INVALID_PARAMETER\n");
                    break ;

/////////////////////////////////////////////// ////////////////////////////////////////////////// ///

                case S_FALSE  :
                        wprintf(L"\t\t\WriteFile S_FALSE\n");
                    break ;
                case E_UNEXPECTED  :
                        wprintf(L"\t\t\WriteFile E_UNEXPECTED\n");
                    break ;
                default :
                        wprintf(L"\t\t\WriteFile default with dword : 0x%x \n", dwResult);
                    break;
            }

        }else
        {
            wprintf(L"Data Sendt\n\n");
        }

Answer 1

好的，我发现错误，不能使用串口com的类比，而是使用了winsock类：

http://msdn.microsoft.com/en-us/library/windows/desktop/ms738545(v=vs.85).aspx

=============================================== ================================================== ==== 初始化：

WSADATA wsaData;

    int iResult;
    // Initialize Winsock
    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if (iResult != 0) {
        printf("WSAStartup failed: %d\n", iResult);
        return 1;
    }

// ======================================================================================================
// Création du Socket : 
    struct addrinfo *result = NULL,
                *ptr = NULL,
                hints;

    ZeroMemory( &hints, sizeof(hints) );
    hints.ai_family = AF_INET ;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_protocol = IPPROTO_TCP;

    #define DEFAULT_PORT "27015"

    // Resolve the server address and port
    iResult = getaddrinfo("10.10.100.254","8899" , &hints, &result); //"10.10.100.254" DEFAULT_PORT  "8899"
    if (iResult == 0) {
        printf("\n\t\tgetaddrinfo, adresse trouvee\n");

        struct addrinfo *res = NULL;
        int error;
        for (res = result; res != NULL; res = res->ai_next)
        {
            char hostname[NI_MAXHOST] = "";

            error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname, NI_MAXHOST, NULL, 0, 0);
            if (error != 0)
            {
                fprintf(stderr, "error in getnameinfo: %s\n", gai_strerror(error));
                continue;
            }
            if (*hostname != '\0')
            {
                printf("hostname: %s\n", hostname);
                ptr=res;
            }
        }
    }else
    {
        printf("getaddrinfo failed: %d\n", iResult);
        WSACleanup();
        return 1;
    }

    SOCKET ConnectSocket = INVALID_SOCKET;

    // Attempt to connect to the first address returned by
    // the call to getaddrinfo


    // Create a SOCKET for connecting to server
    ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype, ptr->ai_protocol);

    if (ConnectSocket == INVALID_SOCKET) {
        printf("Error at socket(): %ld\n", WSAGetLastError());
        freeaddrinfo(result);
        WSACleanup();
        return 1;
    }

// ======================================================================================================
// Connect to a socket :
    iResult = connect( ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
    if (iResult == SOCKET_ERROR) {
        wprintf(L"socket function failed with error: %ld\n", WSAGetLastError());
        switch(WSAGetLastError())
        {
        case WSAEHOSTUNREACH:
            wprintf(L"\n\t\tNo route to host. A socket operation was attempted to an unreachable host. See WSAENETUNREACH.\n");
            break;
        default:
            break;
        }
        closesocket(ConnectSocket);
        ConnectSocket = INVALID_SOCKET;

    }

    // Should really try the next address returned by getaddrinfo
    // if the connect call failed
    // But for this simple example we just free the resources
    // returned by getaddrinfo and print an error message

    freeaddrinfo(result);

    if (ConnectSocket == INVALID_SOCKET) {
        printf("Unable to connect to server!\n");
        WSACleanup();
        return 1;
    }

// ======================================================================================================
// Send and recive data : 
    #define DEFAULT_BUFLEN 512

    int recvbuflen = DEFAULT_BUFLEN;

    char *sendbuf = "this is a test";
    //char recvbuf[DEFAULT_BUFLEN];

    // Send an initial buffer

    for(int i = 0; i<100;i++)
    {
        if(sendCommand(ConnectSocket,i, i, 0, i)==-1) break;
        Sleep(10);
    }

// Disconnecting the Client : http://msdn.microsoft.com/en-us/library/windows/desktop/bb530743(v=vs.85).aspx
// shutdown the send half of the connection since no more data will be sent
    iResult = shutdown(ConnectSocket, SD_SEND);
    if (iResult == SOCKET_ERROR) {
        printf("shutdown failed: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }

    // cleanup
    closesocket(ConnectSocket);
    WSACleanup();

这对我来说很有效率

Answer 2

您切换到Windows套接字看起来不错。我唯一的建议是，如果您需要跨版本兼容性，添加一些回退逻辑，因为WSAStartup无法找到您要求的2.2。

其他建议是风格化的，主要是通过整合所有案例的清理代码来清理您对WSACleanup的使用 - 例如使用SEH / leave或goto fail case。

WriteFile，ERROR_INVALID_PARAMETER

2 个答案: