void UsingifstreamReadJson() { std::ifstream fileHandle("F:/alarm.json", std::ifstream::in | std::ifstream::binary); Json::Reader reader(Json::Features::strictMode()); Json::Value root; if (NULL == reader.parse(fileHandle, root)) { fileHandle.close(); return; } fileHandle.close(...
[nFileSize]; infile.seekg(0, std::ios_base::beg); memset(pFileBytes, 0, nFileSize); //1、每次读取8K //do //{ // infile.read((char*)(pFileBytes + nTotalSize), 8192); // int nReadBytes = infile.gcount(); // if (nReadBytes > 0) nTotalSize += nReadBytes; //} while ...
std::ifstream fileHandle; int nFileLen = 0; fileHandle.open("E:/thriftserver/output/facealarmnew.txt"); fileHandle.seekg(0, std::ios::end); nFileLen = fileHandle.tellg(); fileHandle.seekg(0, std::ios::beg); char szFileBuf[4096] = { 0 }; fileHandle.read(szFileBuf, nFileLen)...
1//read a file into memory2#include <fstream>//std::ifstream3#include <iostream>//std::cout4#defineLEN 105intmain() {6charbuffer[LEN];7buffer[LEN -1] ='\0';8std::ifstreamis("test.txt", std::ifstream::binary);910if(is) {11while(is) {12is.read(buffer, LEN -1);13//最后一...
由istream引申而来) fstream: 可同时读写操作的文件类 (由iostream引申而来) 打开文件(Open a file) ...
I would expect that the latter case has badbit set, but it’s not; net result is that only half of the file is processed with no indications that an error occurred. The implications seem pretty severe; e.g. when processing a file with std::ifstream on a nfs, where read ...
Improves the time to load and parse a large executable (~100MB) on my machine from ~1000ms to ~400ms. Use ifstream::read method to read file data instead of std::copy. … 89bd542 romainthomas merged commit fb789a8 into lief-project:master Dec 15, 2019 romainthomas added a commit...
C++中函数指针的用途非常广泛，例如回调函数，接口类的设计等，但函数指针始终不太灵活，它只能指向全局或...
(filename, std::ios::binary);if(!istrm.is_open())std::cout<<"打开 "<<filename<<" 失败\n";else{doubled;istrm.read(reinterpret_cast<char*>(&d), sizeof d);// 二进制输入intn;std::strings;if(istrm>>n>>s)// 文本输入std::cout<<"从文件读回:"<<d<<' '<<n<<' '<<s<...
{} }; int readData(const char * filename, vector<Point>& data) { ifstream ifs(filename); if(!ifs){ cout<<"file error"<<endl; return -1; } string date, time; double d[6]: while(ifs>>date) { ifs>>time; for (int i=0;i<6;i++) ifs>>d[I]; if(time=="15:00") { ...