为什么我的函数给了我“变量'url'周围的堆栈被破坏了。”错误?

时间:2014-08-18 14:29:05

标签: c++ stack

我有一个函数,应该从参数中给出的字符串下载一个网站(exacly string是url的结尾)。它让我失败

  

变量'url'周围的堆栈已损坏。

我的代码:

void download_wordnik(string word) {
        string s1 = word;
        std::wstring w_word_Tmp1(s1.begin(), s1.end());
        wstring w_word1 = w_word_Tmp1;      
        std::wstring stemp1 = std::wstring(s1.begin(), s1.end());
        LPCWSTR sw1 = stemp1.c_str();

        TCHAR url[] = TEXT("https://www.wordnik.com/words");
        wsprintf(url, TEXT("%s\/%s\/"), url, sw1);

        LPCWSTR sw2 = stemp1.c_str();
        TCHAR path[MAX_PATH];
        GetCurrentDirectory(MAX_PATH, path);
        wsprintf(path, TEXT("%s\\wordnik\\%s\.txt"), path, sw2);
        HRESULT res = URLDownloadToFile(NULL, url, path, 0, NULL);


        // Checking download
        if(res == S_OK) {
            printf("Ok\n");
        } else if(res == E_OUTOFMEMORY) {
            printf("Buffer length invalid, or insufficient memory\n");
        } else if(res == INET_E_DOWNLOAD_FAILURE) {
            printf("URL is invalid\n");
        } else {
            printf("Other error: %d\n", res);
        }

}

我正在使用此包含

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <Urlmon.h>
#include <regex>

#pragma comment(lib, "urlmon.lib")
using namespace std;

2 个答案:

答案 0 :(得分:4)

可能是因为您复制url超过其容量而导致未定义的行为:

TCHAR url[] = TEXT("https://www.wordnik.com/words");// The size is `30` but ...

wsprintf(url, TEXT("%s\/%s\/"), url, sw1);// It copies more than `30` characters.

使用std::wstring方法,不要弄乱xprintf方法和固定大小的数组。我不熟悉TCHARTEXT(Windows事物),但您可以这样做:

std::wstring url;

url = std::wstring(TEXT("https://www.wordnik.com/words/")) + sw1 + TEXT("/");

答案 1 :(得分:0)

当您url进入wsprintf时,您正在std::wostringstream urlstream; urlstream << TEXT("https://www.wordnik.com/words/") << sw1 << TEXT("/"); std::wstring url = urlstream.str(); 范围之外写作。

而是(用于一般格式化)

std::wstring url = std::wstring(TEXT("https://www.wordnik.com/words/")) + sw1 + TEXT("/");

或(更简单)

    std::wstring w_word(word.begin(), word.end());
    std::wstring url = std::wstring(TEXT("https://www.wordnik.com/words/")) + w_word + TEXT("/");
    TCHAR currentpath[MAX_PATH];
    GetCurrentDirectory(MAX_PATH, currentpath);
    std::wstring path = std::wstring(currentpath) + TEXT("\\wordnik\\") + w_word + TEXT(".txt");
    HRESULT res = URLDownloadToFile(NULL, url.c_str(), path.c_str(), 0, NULL);

你正在复制很多变量 - 据我所知,你可以将代码缩减到这个:

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