[英]c++ memory allocation in a for loop in vector<char> in a for loop
重新分配矢量chunk
对象时,以下函数中存在内存分配问题,我缺少什么,可能的解决方案是什么?
public:
void send_FILE(std::string file_id, std::string file_path)
{
char* fid = moqane::number2string::To_CharArray(file_id);
int fid_length = moqane::number2string::CharArray_Length(fid);
const int step = packet_->BUFFER_SIZE;
long total_length = boost::filesystem::file_size(file_path);
for (int x = 0; x < total_length; x += step)
{
if ((x + step) <= total_length)
{
std::vector<char> chunk = moqane::file::GetFileChunk(file_path, x, x+step);
write_FILE_CHUNK(fid, fid_length, chunk);
}
else
{
std::vector<char> chunk = moqane::file::GetFileChunk(file_path, x, total_length);
write_FILE_CHUNK(fid, fid_length, chunk );
}
}
}
编辑
这个moqane :: GetFileChunk()函数
public:
static std::vector<char> GetFileChunk(std::string file_path, int from_pos, int to_pos)
{
boost::filesystem::ifstream file;
if (file)
{
file.open(file_path.c_str(),std::ios::in|ios::binary);
file.seekg(from_pos,std::ios::beg);
std::vector<char> buffer(to_pos - from_pos);
file.read(&buffer[0], to_pos);
return buffer;
}
}
file.read(&buffer[0], to_pos);
应该
file.read(&buffer[0], to_pos - from_pos);
否则,如果from_pos
不为零, from_pos
超出buffer
的末尾进行buffer
,从而导致严重的灾难。
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