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...
#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()...
问题出现的原因：在对类中的字段或属性直接赋值的时候出现异常而造成的这个异常。 例如： class MyClass { public static string ConnectionString = GetConnectionString(); private static string GetConnectionString() { throw new Exception(); } } 在使用这个类的时候就会引发该异常 ...
voidscn::ReadUNetworkFromNetFile(UNetwork<>::pNetwork &network,char* path) {usingstd::getline;usingstd::string;usingstd::cout;usingstd::endl;std::ifstreaminfile(path); UGraph::pGraphgraph(newUGraph()); network.reset(newUNetwork<>(graph));stringline;stringtemp;std::stringstreamss;//read ...
{ fsize = fs::file_size(filepath); } else { throw(std::invalid_argument("File not found: " + filepath.string())); } std::ifstream infile; infile.exceptions(std::ifstream::failbit | std::ifstream::badbit); try { infile.open(filepath.c_str(), std::ios::in | std::ifstream::...
inFile.open(location);中的参数不对.
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; ...
void getNextWord(std::ifstream& inFile, std::string& token, std::string tokenizer, int64_t endOffSet) { token.clear(); char byte[1]; while(inFile.good()) { if(inFile.tellg() >= endOffSet) return; byte[0] =inFile.peek(); if(byte[0]=='\n' || byte[0] == tokenizer.c_str...
void Sha256File::getHash( std::ifstream& inFile, unsigned char* pHash ) { SHA256Context sha256; SHA256Init(&sha256); uint8_t* pMovableBuffer = pBuffer; // Ensure it is on a 64-bit boundary. INTPTR offs; if ((offs = reinterpret_cast<INTPTR>(pBuffer) & 7L)) pMovableBuffer +...
strPath = argv[1]; else strPath = "c://words.txt"; //read file ifstreaminFile(strPath); while( !inFile.eof()) { string strWord; inFile >> strWord; AddWordToList(strWord); } OutPutWordsList(); OutPutCount(); return 0;