我在尝试压缩文件数据时遇到问题。一切都与压缩调用有关，但它不是压缩调用本身，因为在它之前抛出了段错误。展示我的代码会让它更清晰:
std::cout << "FILENAME: ";
std::cin >> filename;
if(!fileExists(filename))
{
std::cout << "ERR: FILE NOT FOUND." << std::endl;
continue;
}
std::cout << "Compressing file data...";
writeFile(filename, zlib_compress(readFile(filename)));
std::cout << " Done." << std::endl;
在函数 zlib_compress...
std::string zlib_compress(const std::string& str)
{
std::cout << "DEBUG" << std::endl;
z_stream zs; // z_stream is zlib's control structure
memset(&zs, 0, sizeof(zs));
if (deflateInit(&zs, 9) != Z_OK)
std::cout << "deflateInit failed while compressing." << std::endl;
zs.next_in = (Bytef*)str.data();
zs.avail_in = str.size(); // set the z_stream's input
int ret;
char outbuffer[1073741824];
std::string outstring;
// retrieve the compressed bytes blockwise
do
{
zs.next_out = reinterpret_cast<Bytef*>(outbuffer);
zs.avail_out = sizeof(outbuffer);
ret = deflate(&zs, Z_FINISH);
if (outstring.size() < zs.total_out)
{
// append the block to the output string
outstring.append(outbuffer, zs.total_out - outstring.size());
}
} while(ret == Z_OK);
deflateEnd(&zs);
if(ret != Z_STREAM_END) // an error occurred that was not EOF
{
std::ostringstream oss;
oss << "Exception during zlib compression: (" << ret << ") " << zs.msg;
std::cout << oss.str();
}
return outstring;
}
我知道，我知道，该功能需要工作，我只是从某个地方 C&P 来尝试一下。
但事情是这样的:
std::cout << "DEBUG" << std::endl; 从不被调用。编译器说段错误来自这里:
std::string zlib_compress(const std::string& str)
> {
但是为什么……？它在早些时候工作。我只是不知道出了什么问题!
编辑:调试器输出。
#0 00000000 0x00402cbb in __chkstk_ms() (??:??)
#1 004013BE zlib_compress(str=...) (C:\Users\***\Documents\Work\Programming\Compressor\z.cpp:5)
#2 00401DDA _fu15___ZSt4cout() (C:\Users\***\Documents\Work\Programming\Compressor\main.cpp:80)
最佳答案
字符输出缓冲区[1073741824];
这太大了，无法放入堆栈
关于C++甚至在进入函数之前就出现段错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15125891/