从 URL 读取远程 txt 文件并将其按原样存储到 const char* [] 数组的 C++ 代码

Question

我正在尝试创建一个cpp程序，该程序将从URL读取远程文件，例如，http://10.10.10.10/file.txt 文件包含以下格式的单词“word1”，“word2”，“word3” 我必须将文件内容按原样存储到数组“const char* Wordslist[3]={"word1","word2","word3"}"。

#include <iostream>
#include <string>
#include <vector>
#include <Windows.h>
#include <wininet.h>

#pragma comment(lib, "wininet.lib")

// Function to parse the input string and populate the wordlist array
void parseAndPopulate(const std::string& input, const char** wordlist, int size) {
    std::vector<std::string> words;
    size_t pos = 0;
    while ((pos = input.find("\",\"", pos)) != std::string::npos) {
        words.push_back(input.substr(1, pos - 1)); // Extract word between quotes
        pos += 3; // Move past the ", delimiter
    }
    // Add the last word (no ", delimiter at the end)
    words.push_back(input.substr(pos + 2, input.size() - pos - 3));
    // Check if the size matches
    if (words.size() != size) {
        std::cerr << "Error: Number of words in the file does not match the specified size\n";
        return;
    }

    // Copy words to wordlist array
    for (int i = 0; i < size; ++i) {
        wordlist[i] = words[i].c_str();
    }
}

int main() {
    const int size = 3; // Size of wordlist array
    const char* wordlist[size]; //This does not work!!!!!!

    // URL to fetch data from
    const char* url = "10.10.10.10/file.txt";

    HINTERNET hInternet = InternetOpenA("HTTPGET", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
    if (hInternet != NULL) {
        HINTERNET hUrlFile = InternetOpenUrlA(hInternet, url, NULL, 0, INTERNET_FLAG_RELOAD, 0);
        if (hUrlFile != NULL) {
            std::string readBuffer;
            char buffer[1024];
            DWORD bytesRead = 0;

            while (InternetReadFile(hUrlFile, buffer, sizeof(buffer), &bytesRead) && bytesRead > 0) {
                readBuffer.append(buffer, bytesRead);
            }

            // Close the URL file handle
            InternetCloseHandle(hUrlFile);

            // Parse the fetched data and populate the wordlist array
            parseAndPopulate(readBuffer, wordlist, size);

            // Print the populated wordlist array
            for (int i = 0; i < size; ++i) {
                std::cout << wordlist[i] << std::endl;
            }
        }
        else {
            std::cerr << "Error: Failed to open URL " << url << std::endl;
        }

        // Close the internet handle
        InternetCloseHandle(hInternet);
    }
    else {
        std::cerr << "Error: Failed to initialize WinINet" << std::endl;
    }

    return 0;
}

如何实现这一点？ 我需要“const char* wordlist[];”看起来像这样： const char* wordlist[3]={"word1","word2","word3"};

Answer 1

您必须将

const char* wordlist[size];

更改为

char* wordlist[size];

，因为您稍后会更改 char*。您还必须将参数

const char** wordlist

更改为

char* wordlist[]

。

在 parseAndPopulate(...) 的 for 循环中，您必须将代码更改为

wordlist[i] = (char*)malloc(sizeof(words[i].c_str()));
strcpy(wordlist[i], words[i].c_str());

malloc 分配 c_str 所需的内存并返回指向该内存的指针。

strcpy将c_str从words[i]复制到分配的内存。