// 打开文件,获得文件流 std::ifstream inFile(fileName.c_str(), std::ios::in | std::ios::binary); std::ostringstream oss; oss << inFile.rdbuf(); std::string buffer = oss.str(); inFile.close();
在C++中,std::ifstream 明显比 FILE 慢。这是因为 std::ifstream 是C++标准库中的一个文件流类,它用于处理文件,而 FILE 是一个C语言库中的文件指针,它用于处理标准输入输出。由于 std::ifstream 是C++中的对象,因此它需要额外的内存分配和垃圾回收,这导致了其性能的下降。 相对于 std::ifstream,FILE 是一种...
std::cout <<"opening '"<< filename <<"'..."<< std::endl;boolsuccess(false);// call to functionality in the static library{std::ifstreaminfile(filename.c_str()); success = infile.good();// ...}// success == false;// ...return0; } stdcout.txt says: opening 'D:/My proj...
26 voidrepeatedWords(std::stringfileName) { 27 28 std::ifstream infile(fileName.c_str()); 29 30 if(!infile) { 31 std::cout<<"Read error!!"<<std::endl; 32 33 return; 34 } 35 36 std::map<std::string,int>wordCount; 37 for(std::stringword, newWord; infile>>word;++wordCount[...
void repeatedWords(std::string fileName) { 27 28 std::ifstream infile(fileName.c_str()); 29 30 if (!infile) { 31 std::cout << "Read error!!" << std::endl; 32 33 return; 34 } 35 36 std::vector<std::string> wordsVec; ...
#include <assert.h> using namespace std;; int main(int argc, char **argv) { std::string filename("D:/My projects/Test/test.cfg"); std::cout << "opening '" << filename << "'..." << std::endl; std::ifstream infile(filename.c_str()); assert(infile.good()...
using namespace std; int main() { ifstream inputfile("q.cpp"); vector<string> vec; string str; while( getline(inputfile,str) ) vec.push_back(str); copy(vec.begin(),vec.end(),ostream_iterator<string>(cout,"\n")); return 0; ...
using namespace std; int main() { ifstream inputfile("q.cpp"); vector<string> vec; string str; while( getline(inputfile,str) ) vec.push_back(str); copy(vec.begin(),vec.end(),ostream_iterator<string>(cout,"\n")); return 0; ...
template<typename T> void loadTxtConfig(const std::string& filename, std::set<T>& ids) { std::ifstream infile(filename); if (!infile) { return; } std::string line; if (std::is_integral<T>::value) { while (std::getline(infile, line)) { ids.emplace(static_cast<T>(...
(const std::string& line) { return line; } template<typename T> void loadTxtConfig(const std::string& filename, std::set<T>& ids) { std::ifstream infile(filename); if (!infile) return; std::string line; while (std::getline(infile, line)) { ids.emplace(convert<T>(line)); }...