使用libzip将文件解压缩到磁盘 [英] Unzipping a file to disk using libzip

问题描述

我正在尝试使用c ++和libzip库解压缩可执行文件.从rodrigo对类似问题的答案开始，我来看下面的示例代码:

I'm trying to unzip an executable file using c++ and the libzip library. Starting with the answer by rodrigo on a similar question, I come to this sample code:

#include <zip.h>
int main()
{
    //Open the ZIP archive
    int err = 0;
    zip *z = zip_open("foo.zip", 0, &err);

    //Search for the file of given name
    const char *name = "file.txt";
    struct zip_stat st;
    zip_stat_init(&st);
    zip_stat(z, name, 0, &st);

    //Alloc memory for its uncompressed contents
    char *contents = new char[st.size];

    //Read the compressed file
    zip_file *f = zip_fopen(z, "file.txt", 0);
    zip_fread(f, contents, st.size);
    zip_fclose(f);

    //And close the archive
    zip_close(z);
}

据我了解，此代码确实可以解压缩文件，但我不知道如何将文件写入磁盘，就像提取zip文件一样，使用诸如winzip之类的工具也是如此.将解压缩后的数据存储在内存中对我没有帮助，但是我一直无法弄清楚如何将文件实际存储到磁盘上.

from what I understand, this code does work to unzip a file, but I do not know how to write that file to the disk, much like extracting a zip file would so using a tool like winzip does. Having the unzipped data in memory doesn't help me, but I've been unable to figure out how to actually get the files onto the disk.

推荐答案

应该执行以下操作:

if(!std::ofstream("file1.txt").write(contents, st.size))
{
    std::cerr << "Error writing file" << '\n';
    return EXIT_FAILURE;
}

查找 std :: ofstream .

当然，您应该在继续操作之前检查所有zip文件功能，以查看它们是否返回了错误.

Of course you should check all your zip file functions to see if they returned errors before proceeding.

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