ifstream

问题 Based on this this question: How to read a binary file into a vector of unsigned chars In the answer they have: std::vector<BYTE> readFile(const char* filename) { // open the file: std::basic_ifstream<BYTE> file(filename, std::ios::binary); // read the data: return std::vector<BYTE>((std::istreambuf_iterator<BYTE>(file)), std::istreambuf_iterator<BYTE>()); } Which reads the entire file into the vector. What I want to do is read (for example) 100 bytes at a time in the vector, then do stuff,

问题 Based on this this question: How to read a binary file into a vector of unsigned chars In the answer they have: std::vector<BYTE> readFile(const char* filename) { // open the file: std::basic_ifstream<BYTE> file(filename, std::ios::binary); // read the data: return std::vector<BYTE>((std::istreambuf_iterator<BYTE>(file)), std::istreambuf_iterator<BYTE>()); } Which reads the entire file into the vector. What I want to do is read (for example) 100 bytes at a time in the vector, then do stuff,

问题 Based on this this question: How to read a binary file into a vector of unsigned chars In the answer they have: std::vector<BYTE> readFile(const char* filename) { // open the file: std::basic_ifstream<BYTE> file(filename, std::ios::binary); // read the data: return std::vector<BYTE>((std::istreambuf_iterator<BYTE>(file)), std::istreambuf_iterator<BYTE>()); } Which reads the entire file into the vector. What I want to do is read (for example) 100 bytes at a time in the vector, then do stuff,

问题 I am reading a file like this: char string[256]; std::ifstream file( "file.txt" ); // open the level file. if ( ! file ) // check if the file loaded fine. { // error } while ( file.getline( string, 256, ' ' ) ) { // handle input } Just for testing purposes, my file is just one line, with a space at the end: 12345 My code first reads the 12345 successfully. But then instead of the loop ending, it reads another string, which seems to be a return/newline. I have saved my file both in gedit and

问题 I am reading a file like this: char string[256]; std::ifstream file( "file.txt" ); // open the level file. if ( ! file ) // check if the file loaded fine. { // error } while ( file.getline( string, 256, ' ' ) ) { // handle input } Just for testing purposes, my file is just one line, with a space at the end: 12345 My code first reads the 12345 successfully. But then instead of the loop ending, it reads another string, which seems to be a return/newline. I have saved my file both in gedit and

问题 My problem is that using ifstream read and fread on a file descriptor don't seem to produce the same results. I open a file and read its input using ifstream open/read in ios::binary mode. Then I write this buffer out to a file. out1. Next, I open the same file, read its input using FILE* file descriptors and fread. Then I write this buffer out to another file, out2. When I compare out1 to out2 they do not match. out2, which uses FILE*, seems to stop reading, near the end. More worrisome is

问题 I have the following c++ code in visual studio to read characters from a file. ifstream infile; infile.open(argv[1]); if (infile.fail()) { cout << "Error reading from file: " << strerror(errno) << endl; cout << argv[0] << endl; } else { char currentChar; while (infile.get(currentChar)) { cout << currentChar << " " << int(currentChar) << endl; //... do something with currentChar } ofstream outfile("output.txt"); outfile << /* output some text based on currentChar */; } infile.close(); The file

问题 The program output Should be: The numbers are: 101 102 103 104 105 106 107 108 108 110 But my output is: The numbers are: 0 0 0 0 0 0 0 0 1606416272 32767 This is my code: // This program reads data from a file into an array. #include <iostream> #include <fstream> // To use ifstream using namespace std; int main() { const int ARRAY_SIZE = 10; // Array size int numbers[ARRAY_SIZE]; // Array number with 10 elements int count = 0; // Loop counter variable ifstream inputFile; // Input file stream

问题 The program output Should be: The numbers are: 101 102 103 104 105 106 107 108 108 110 But my output is: The numbers are: 0 0 0 0 0 0 0 0 1606416272 32767 This is my code: // This program reads data from a file into an array. #include <iostream> #include <fstream> // To use ifstream using namespace std; int main() { const int ARRAY_SIZE = 10; // Array size int numbers[ARRAY_SIZE]; // Array number with 10 elements int count = 0; // Loop counter variable ifstream inputFile; // Input file stream

问题 The program output Should be: The numbers are: 101 102 103 104 105 106 107 108 108 110 But my output is: The numbers are: 0 0 0 0 0 0 0 0 1606416272 32767 This is my code: // This program reads data from a file into an array. #include <iostream> #include <fstream> // To use ifstream using namespace std; int main() { const int ARRAY_SIZE = 10; // Array size int numbers[ARRAY_SIZE]; // Array number with 10 elements int count = 0; // Loop counter variable ifstream inputFile; // Input file stream