如何修复删除字符串 c++ 中所有实例的错误-解网

问：

我在删除 c++ 字符串中的所有“amp;”实例时遇到了问题，我创建了一个循环将“amp;”替换为“”，直到没有“amp;”实例。我遇到了一个未知错误，程序开始打印随机字符，我以前从未见过。下面有一张图片。我使用多个其他循环来删除同一程序中的内容，所以我不确定为什么现在会发生这种情况。

角色故障：https://screenrec.com/share/EcVLHoasvU

这是我使用的循环：

try {
  while(DownloadLink.find("amp;") != string::npos){
    DownloadLink.replace(DownloadLink.find("amp;"), 4, "");
  }
} catch (const exception& Error) {
  cerr << "Error: " << Error.what();
}

对于最小可重现的示例：

#include <iostream>
#include <string>

using namespace std;

int main() {
    string DownloadLink;
    
    DownloadLink = "https://rr2---sn-gjo-w43l.googlevideo.com/videoplayback?expire=1685464604&amp;ei=vNF1ZPypCYLk8wS04YS4Bw&amp;ip=193.135.13.240&amp;id=o-AOroxIeyjf0SXpp4Jjav3mMxHNrQnAmWFHliIzDxKFK8&amp;itag=22&amp;source=youtube&amp;requiressl=yes&amp;mh=xJ&amp;mm=31%2C29&amp;mn=sn-gjo-w43l%2Csn-ab5sznly&amp;ms=au%2Crdu&amp;mv=m&amp;mvi=2&amp;pl=24&amp;initcwndbps=248750&amp;spc=qEK7B7YCjgMFmSN1lRYNJdgmcwOfjSE&amp;vprv=1&amp;svpuc=1&amp;mime=video%2Fmp4&amp;ratebypass=yes&amp;dur=1535.256&amp;lmt=1685416420579114&amp;mt=1685442532&amp;fvip=1&amp;fexp=24007246%2C24362688%2C51000022&amp;beids=24350017&amp;c=ANDROID&amp;txp=4318224&amp;sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cspc%2Cvprv%2Csvpuc%2Cmime%2Cratebypass%2Cdur%2Clmt&amp;sig=AOq0QJ8wRAIgOFevBFo84_aL0L8hSD1vwztRDGStTF6OaohO4gA8OIUCIE1wN5685dZ7FROQXO9W7BOv4thF8B3KxFE6iefy60xS&amp;lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&amp;lsig=AG3C_xAwRgIhAOO9mtQzsKDrCes2EPmTwOyB8QtGblPFo30I9VrOsSnMAiEAh91ImIfeaugrIfJ4Q0U30viktdo4sWHv0ywQV0kfjt8%3D&amp;title=Ages+1+-+100+Fight+For+$500,000";
    while(DownloadLink.find("amp;") != string::npos){
        DownloadLink.replace(DownloadLink.find("amp;"), 4, "");
    }
    cout << DownloadLink;

    return 0;
}

以前有没有人见过这样的事情或知道如何提供帮助？谢谢

C++ 字符串循环取代了错误处理

首先，我建议您查看此问题，以纠正您因此处列出的原因而使用的操作。其次，您可以在 C++ 中替换。尝试用任何东西替换某些东西可能会通过擦除它来改善。至于问题，您已经在评论中说过您重新安装了编译器，因此我不需要解决它。using namespace std;replace()erase()

我修改的代码：

#include <iostream>
#include <string>
int main() {
//You can enter the MrBeast challenge link during initialization
    std::string DownloadLink = "https://rr2---sn-gjo-w43l.googlevideo.com/videoplayback?expire=1685464604&amp;ei=vNF1ZPypCYLk8wS04YS4Bw&amp;ip=193.135.13.240&amp;id=o-AOroxIeyjf0SXpp4Jjav3mMxHNrQnAmWFHliIzDxKFK8&amp;itag=22&amp;source=youtube&amp;requiressl=yes&amp;mh=xJ&amp;mm=31%2C29&amp;mn=sn-gjo-w43l%2Csn-ab5sznly&amp;ms=au%2Crdu&amp;mv=m&amp;mvi=2&amp;pl=24&amp;initcwndbps=248750&amp;spc=qEK7B7YCjgMFmSN1lRYNJdgmcwOfjSE&amp;vprv=1&amp;svpuc=1&amp;mime=video%2Fmp4&amp;ratebypass=yes&amp;dur=1535.256&amp;lmt=1685416420579114&amp;mt=1685442532&amp;fvip=1&amp;fexp=24007246%2C24362688%2C51000022&amp;beids=24350017&amp;c=ANDROID&amp;txp=4318224&amp;sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cspc%2Cvprv%2Csvpuc%2Cmime%2Cratebypass%2Cdur%2Clmt&amp;sig=AOq0QJ8wRAIgOFevBFo84_aL0L8hSD1vwztRDGStTF6OaohO4gA8OIUCIE1wN5685dZ7FROQXO9W7BOv4thF8B3KxFE6iefy60xS&amp;lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&amp;lsig=AG3C_xAwRgIhAOO9mtQzsKDrCes2EPmTwOyB8QtGblPFo30I9VrOsSnMAiEAh91ImIfeaugrIfJ4Q0U30viktdo4sWHv0ywQV0kfjt8%3D&amp;title=Ages+1+-+100+Fight+For+$500,000";
    while (true) {
        size_t temp = DownloadLink.find("amp;");//since the link is pretty long, you only have to find it once
        if (temp != std::string::npos) {
            DownloadLink.erase(temp, 4);//you have the position saved in temp
        }
        else { break; }//if there is no more, break
    }
    std::cout << DownloadLink;
    return 0;
}

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如何修复删除字符串 c++ 中所有实例的错误

How to fix error with removing all instances in a string c++

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