- 1 名前：デフォルトの名無しさん [2011/09/15(木) 00:17:43.25 ]
- スレを勃てるまでもない低俗なC/C++の質問はここでお願いします。
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- 87 名前：デフォルトの名無しさん mailto:sage [2011/10/09(日) 10:18:33.83 ]
- std::ifstream ifs("test.txt", std::ios::in|std::ios::binary);
ifs.seekg(0, std::ios::end );
size_t size = ifs.tellg();
ifs.seekg(0, std::ios::beg );
char *buff = new char[size+1];
ifs.read(buff, size);
buff[size] = '\0';
// ...
delete[] buff;
- 88 名前：デフォルトの名無しさん mailto:sage [2011/10/09(日) 10:54:32.05 ]
- #include <exception>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>
template <class A> void readAllAtOnce(char const * path, std::vector<char, A> & data) {
std::fstream file;
file.exceptions(std::ios::badbit | std::ios::eofbit | std::ios::failbit);
file.open(path, std::ios::in | std::ios::binary);
file.seekg(0, std::ios::end);
std::ios::pos_type end(file.tellg());
file.seekg(0, std::ios::beg);
std::ios::pos_type beg(file.tellg());
std::ios::off_type off(end - beg);
if(data.max_size() < off) throw std::exception();
data.resize(off);
file.read(&data[0], off);
file.close(); }
int main(void) {
try {
std::vector<char> buf;
readAllAtOnce("test.txt", buf);
std::string str(buf.begin(), buf.end());
std::cout << str << std::endl; }
catch(...) { std::cout << "err" << std::endl; }
return 0; }
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