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C語(yǔ)言無(wú)法直接訪(fǎng)問(wèn)網(wǎng)頁(yè)API，語(yǔ)言訪(fǎng)頁(yè)aC語(yǔ)需要借助第三方庫；而C#語(yǔ)言可以使用HttpClient類(lèi)輕松實(shí)現。問(wèn)網(wǎng)

C語(yǔ)言訪(fǎng)問(wèn)網(wǎng)頁(yè)API

1、語(yǔ)言訪(fǎng)頁(yè)aC語(yǔ)使用li(⊙_⊙)bcurl庫

libcu(??ヮ?)?*:???rl是問(wèn)網(wǎng)一個(gè)開(kāi)源的客戶(hù)端URL傳輸庫，支持多種協(xié)議和數據傳輸方式。語(yǔ)言訪(fǎng)頁(yè)aC語(yǔ)

安裝libcurl庫并包含頭文件后，問(wèn)網(wǎng)可以使用其提供的語(yǔ)言訪(fǎng)??頁(yè)aC語(yǔ)函數進(jìn)行HTTP請求和響應的處理。

示例代碼：

“ヽ(′ー｀)ノ;`c

#inclu(╯°□°）╯de <stdio.h>

int main() {

curl_global_init(CURL_GLOBAL_DEFAULT);

curl = curl_easy_init();

curl_easy_setopt(curl,問(wèn)網(wǎng) CURLOPT_URL, "http://example.com");

re(′_｀)s = curl_eヽ(′▽?zhuān)?ノasy_perform(curl);

if(res != CURLE_OK)

fprintf(stderr, "curl_easy_(′▽?zhuān)?perform() failed: %s

curl_easy_cleanup(curl);

}

curl_global_cleanup();

return 0;

}

“`

2、使用Winsock庫（Windows平臺）

Winsock是語(yǔ)言訪(fǎng)頁(yè)aC語(yǔ)Windows平臺上的網(wǎng)絡(luò )編程接口，提供了底層的問(wèn)網(wǎng)網(wǎng)絡(luò )通信功能。

安裝Winsock庫并(╯‵□′)╯包含頭文件后，語(yǔ)言訪(fǎng)頁(yè)aC語(yǔ)可以使用其提供的( ?▽?)問(wèn)網(wǎng)函數進(jìn)行網(wǎng)絡(luò )連接和數據(???)傳輸。

示例代碼：

“`c

#include <winsock2.h>

#include <ws2tcpip.h>

#include <st??dio.h>??

#inclヽ(′▽?zhuān)?ノude <string.h>

int main() {

WSADATA wsaData;

SOCKET ConnectSocket;

char buf[512];

const char* sendbuf = "??GET / HTTP/1.1r

Hヾ(′?｀)?ost: example.┐(′д｀)┌comr

Connection: closer

r

";

int iResult;

char recvbuf[512];

int recvbuflen = 512;

if (Wヽ(′▽?zhuān)?/SAStaヽ(′▽?zhuān)?/rtup(MAKEWORD(2, 2), &wsaData) != 0) {

printf("Failed to load Winso(O_O)ck

");

return 1;

}

hints.ai_family = AF_UNSPEC;

hints.ai_socktype = SOCK_STREAM;

hints.ai( ?▽?)_protocol = IPPROTO??_TCP;

hints.ai_flags = AI_PASSIVE;

if (getaddrinfo(NUL??L, "80", &hints, &result) != 0) {

printf("getaddrinfo failed

");

WSACleanup((′?ω?`));

return 1;

}

ConnectS??ocket = socket(result>ai_family, result>ai_socktype, result>ai_protocol);

if (ConnectSocket == INVALID_SOCKET) {

printf("Error at socket(): %d

", WSAGetLastError()??);(′?｀)

freeaddrinfo(result);

return 1;

}

printf(&quo(???)t;connect() failed with er(′?｀)ror: %d

", WSAGetLastError());

freeaddrinfo(result);

closesocket(ConnectSocket);

WSACleanup();

return 1;

}

freeaddrinfo(result);

iResult = send(ConnectSocket, sendbuf, (int)strlen(sen(/ω＼)dbuf), 0);

if (i(′▽?zhuān)?Result == SOCKET_ERROR)?? {

printf(&qu(????)ot;send() failed with error: %d

", WSAGetLast??Error());

closesocket(ConnectSocket);

WSACleanup();

return 1;

} else {

Ze(°ロ°) !roMemory(&(recvbuf[0]), recvbuflen); // Clear the buffer.

iResult = recv(ConnectSocket, recvbuf, recvbuf(╬?益?)len, 0)??; // Receive?? reply from the server. // Note: additional data may be received beyond the end of the current message. // Check for errors. If there are any errors, output the error message and exit the program. // Otherwise, output the received data. // Close the connection socket. // Clean up the Winsock library. // Print out the data received from the server. // Release th??e socket pointer. // Close the client socket??. // Clean up the Winsock library. // Return to command prompt. // Error handling is omitted for brevity. // Example usage of a nonblocking socket is shown below. // The ‘iMode’ parameter determines whether the socket is in blocking or nonblocking mode. // Set the socket to nonblocking mode. // Set the socket to blocking mode. // Set the socket to?? nonblocking mode again. // Check if the operation was successful or not. // If it was successful, print out a success message and exit the program. // If it was not successful, print out an error me┐(′д｀)┌ssage and exit the program. // Free the memory allocated for the address structure returned by getaddrinfo(). // Close the soc(◎_◎;)ket handle returned by getaddrinfo(). // Clean up the Winsock li( ???)brary by cal??ling WSACleanup(). // Return to command prompt. }*/}