Question

我在VS 2010下的boost中遇到了zlib库的问题。我构建了库，并在boost / stage / lib文件夹中生成了相应的dll / libs。我将.dll添加到我的程序调试文件夹中，并在matching.lib中链接。

但是当我真正尝试使用zlib流时，我遇到了问题。下面是一个例子：

#include <cstring>
#include <string>
#include <iostream>
#include <boost\iostreams\filter\gzip.hpp>
#include <boost\iostreams\filtering_streambuf.hpp>
#include <boost\iostreams\copy.hpp>
std::string DecompressString(const std::string &compressedString)
{
    boost::iostreams::filtering_streambuf<boost::iostreams::input> in;
    in.push(boost::iostreams::zlib_decompressor());
    in.push(compressedString);
    std::string retString = "";

    copy(in, retString);
    return retString;
}



when I try to compile thise though, I get multiple errors including:
error C2039: 'char_type' : is not a member of 'std::basic_string<_Elem,_Traits,_Ax>'    c:\program files (x86)\boost\boost_1_46_0\boost\iostreams\traits.hpp
error C2208: 'boost::type' : no members defined using this type c:\program files (x86)\boost\boost_1_46_0\boost\iostreams\traits.hpp
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int   c:\program files (x86)\boost\boost_1_46_0\boost\iostreams\traits.hpp

如果我将代码更改为以下内容：

std::string DecompressString(const std::string &compressedString)
{

    boost::iostreams::filtering_streambuf<boost::iostreams::input> in;
    in.push(boost::iostreams::zlib_decompressor());
    std::string retString = "";
    return retString;

}

它编译，意味着问题在于compress.smp的in.push和retString的复制。难道我做错了什么？我不允许使用这样的字符串吗？

提前致谢

Answer 1

试试这个：

#include <string>
#include <iostream>
#include <sstream>
#include <boost\iostreams\filter\zlib.hpp>
#include <boost\iostreams\filtering_streambuf.hpp>
#include <boost\iostreams\copy.hpp>

std::string DecompressString(const std::string &compressedString)
{
    std::stringstream src(compressedString);
    boost::iostreams::filtering_streambuf<boost::iostreams::input> in(src);
    std::stringstream dst;
    boost::iostreams::filtering_streambuf<boost::iostreams::output> out(dst);
    in.push(boost::iostreams::zlib_decompressor());

    boost::iostreams::copy(in, out);
    return dst.str();
}

基本问题似乎是你试图在字符串类型而不是流类型上使用boost::iostreams::copy()。此外，包括zlib.hpp而不是gzip.hpp可能也不会造成伤害。

提升zlib问题

1 个答案: