本文實例展示了Windows網絡編程中winsock實現文件傳輸的方法，對于進行Windows下的winsock網絡編程有一定的借鑒參考價值。
該程序代碼主要是基于TCP流協議的winsock網絡文件傳輸示例，采用Windows下的C語言編寫?？梢詫崿F傳遞任何格式文件的文件傳輸功能。
具體實現代碼如下：
Server端代碼如下：
/************************************************************************* > File Name: Win_Server.c > Author: SongLee ************************************************************************/ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <WinSock2.h> #define PORT 8087 #define SERVER_IP "127.0.0.1" #define BUFFER_SIZE 1024 #define FILE_NAME_MAX_SIZE 512 #pragma comment(lib, "WS2_32") int main() { // 聲明并初始化一個服務端(本地)的地址結構 sockaddr_in server_addr; server_addr.sin_family = AF_INET; server_addr.sin_addr.S_un.S_addr = INADDR_ANY; server_addr.sin_port = htons(PORT); // 初始化socket dll WSADATA wsaData; WORD socketVersion = MAKEWORD(2, 0); if(WSAStartup(socketVersion, &wsaData) != 0) { printf("Init socket dll error!"); exit(1); } // 創建socket SOCKET m_Socket = socket(AF_INET, SOCK_STREAM, 0); if (SOCKET_ERROR == m_Socket) { printf("Create Socket Error!"); exit(1); } //綁定socket和服務端(本地)地址 if (SOCKET_ERROR == bind(m_Socket, (LPSOCKADDR)&server_addr, sizeof(server_addr))) { printf("Server Bind Failed: %d", WSAGetLastError()); exit(1); } //監聽 if (SOCKET_ERROR == listen(m_Socket, 10)) { printf("Server Listen Failed: %d", WSAGetLastError()); exit(1); } while(1) { printf("Listening To Client.../n"); sockaddr_in client_addr; int client_addr_len = sizeof(client_addr); SOCKET m_New_Socket = accept(m_Socket, (sockaddr *)&client_addr, &client_addr_len); if (SOCKET_ERROR == m_New_Socket) { printf("Server Accept Failed: %d", WSAGetLastError()); break; } char buffer[BUFFER_SIZE]; memset(buffer, 0, BUFFER_SIZE); if (recv(m_New_Socket, buffer, BUFFER_SIZE, 0) < 0) { printf("Server Receive Data Failed!"); break; } char file_name[FILE_NAME_MAX_SIZE+1]; memset(file_name, 0, FILE_NAME_MAX_SIZE+1); strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE:strlen(buffer)); printf("%s/n", file_name); FILE * fp = fopen(file_name, "rb"); //windows下是"rb",表示打開一個只讀的二進制文件 if (NULL == fp) { printf("File: %s Not Found/n", file_name); } else { memset(buffer, 0, BUFFER_SIZE); int length = 0; while ((length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0) { if (send(m_New_Socket, buffer, length, 0) < 0) { printf("Send File: %s Failed/n", file_name); break; } memset(buffer, 0, BUFFER_SIZE); } fclose(fp); printf("File: %s Transfer Successful!/n", file_name); } closesocket(m_New_Socket); } closesocket(m_Socket); //釋放winsock庫 WSACleanup(); return 0; } Client端代碼如下：
/************************************************************************* > File Name: Win_Client.c > Author: SongLee ************************************************************************/ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <WinSock2.h> #define PORT 8087 #define SERVER_IP "127.0.0.1" #define BUFFER_SIZE 1024 #define FILE_NAME_MAX_SIZE 512 #pragma comment(lib, "WS2_32") int main() { // 初始化socket dll WSADATA wsaData; WORD socketVersion = MAKEWORD(2, 0); if(WSAStartup(socketVersion, &wsaData) != 0) { printf("Init socket dll error!"); exit(1); } //創建socket SOCKET c_Socket = socket(AF_INET, SOCK_STREAM, 0); if (SOCKET_ERROR == c_Socket) { printf("Create Socket Error!"); system("pause"); exit(1); } //指定服務端的地址 sockaddr_in server_addr; server_addr.sin_family = AF_INET; server_addr.sin_addr.S_un.S_addr = inet_addr(SERVER_IP); server_addr.sin_port = htons(PORT); if (SOCKET_ERROR == connect(c_Socket, (LPSOCKADDR)&server_addr, sizeof(server_addr))) { printf("Can Not Connect To Server IP!/n"); system("pause"); exit(1); } //輸入文件名 char file_name[FILE_NAME_MAX_SIZE+1]; memset(file_name, 0, FILE_NAME_MAX_SIZE+1); printf("Please Input File Name On Server: "); scanf("%s", &file_name); char buffer[BUFFER_SIZE]; memset(buffer, 0, BUFFER_SIZE); strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE ? BUFFER_SIZE:strlen(file_name)); //向服務器發送文件名 if(send(c_Socket, buffer, BUFFER_SIZE, 0) < 0) { printf("Send File Name Failed/n"); system("pause"); exit(1); } //打開文件，準備寫入 FILE * fp = fopen(file_name, "wb"); //windows下是"wb",表示打開一個只寫的二進制文件 if(NULL == fp) { printf("File: %s Can Not Open To Write/n", file_name); system("pause"); exit(1); } else { memset(buffer, 0, BUFFER_SIZE); int length = 0; while ((length = recv(c_Socket, buffer, BUFFER_SIZE, 0)) > 0) { if (fwrite(buffer, sizeof(char), length, fp) < length) { printf("File: %s Write Failed/n", file_name); break; } memset(buffer, 0, BUFFER_SIZE); } printf("Receive File: %s From Server Successful!/n", file_name); } fclose(fp); closesocket(c_Socket); //釋放winsock庫 WSACleanup(); system("pause"); return 0; } 程序中備有較為詳盡的注釋，相信大家不難理解。感興趣的朋友可以根據自身需要對程序加以靈活改善，使其功能更加強大。
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