1default(1) ifstream();2initialization (2)3explicitifstream (constchar* filename, ios_base::openmode mode = ios_base::in);4explicitifstream (conststring& filename, ios_base::openmode mode = ios_base::in); 2.ifstream::open 打开文件filename,模式默认ios_base::in 1voidopen (constchar* ...
std::ifstream fileHandle("D:/mytext", std::ifstream::in | std::ifstream::binary); std::istreambuf_iterator<char> beg(fileHandle), end; std::string strWholeFileBuffer(beg, end); 1. 2. 3. 方法2 AI检测代码解析 std::ifstream fileHandle("D:/mytext", std::ifstream::in | std::ifst...
2. 如何获取与std::ifstream相关联的文件的大小 要获取与std::ifstream相关联的文件的大小,可以使用std::ifstream的seekg和tellg成员函数。具体步骤如下: 使用std::ios::ate模式打开文件,这样文件指针会自动定位到文件末尾。 使用tellg获取当前文件指针的位置,这个位置就是文件的大小(以字节为单位)。3...
那我第一次使用 fstream::seekg() 和 tellg() 函数,于是我就写了个测试程序: void RandomFileReader(){ using std::ifstream; string fn = "d:\testfile.txt"; ifstream ifs(fn.c_str()); string line; std::getline(ifs,line); while(!line.empty()){ //output current line...
the header in ascii mode. The problem is, sometimes tellg () gives me a completely incorrect result and sometimes it is just fine. Here is an example:char input[200]; std::ifstream fin("blocks.pgm ", std::ios::in); std::ifstream:: pos_type position = fin.tellg(); ...
std::basic_ifstream::close std::basic_ifstream::is_open std::basic_ifstream::open std::basic_ifstream::rdbuf std::basic_ifstream::swap std::basic_ios std::basic_ios::bad std::basic_ios::basic_ios std::basic_ios::clear std::basic_ios::copyfmt ...
②读写非文本文件,必须加std::ifstream::binary tellg() 函数原型:int tellg(); 功能:返回输入流中的当前字符位置 说明: ①返回值为当前字符索引,起始索引为0 ②返回值的意义:已读字符个数 ③读操作,从当前位置的字符开始读取 ④C++98和0x,若failbit, badbit任何一个被置位,则该函数返回-1 ...
std::ifstream读取文件 unsigned char* pFileBytes = nullptr; unsigned int nTotalSize = 0; std::ifstream infile("1.dat", std::ios_base::in | std::ios_base::binary); if (infile.is_open()) { infile.seekg(0, std::ios_base::end); unsigned long long nFileSize = infile.tellg(); if...
类模板basic_ifstream在基于文件的流上实现高级输入操作。它接口了基于文件的流缓冲区%28。std::basic_filebuf%29,高级接口为%28std::basic_istream29%。 的典型实现std::basic_ifstream只包含一个非派生数据成员:std::basic_filebuf<CharT, Traits>... 二次 二次 继承图 还为公共字符类型定义了两种专门化:...
#include<iostream>#include<fstream>#include<string>intmain(){std::ifstream ifstreamHandle;ifstreamHandle.open("F:/video.h264",std::ifstream::in|std::ifstream::binary);ifstreamHandle.seekg(0,std::ios::end);intnFileLen=ifstreamHandle.tellg();ifstreamHandle.seekg(0,std::ios::beg);char*pszRe...