我如何在 C++ 中读取二进制数据？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/6329857/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
how can i read binary data in c++?
提问by Mahdi_Nine
I need to read and write binary data in C++.I use from ofstreamand ifstreamclasses but it can't read some chars like 9,13,32.If is there another way to read and write theme.
我需要在 C++ 中读取和写入二进制数据。我使用 fromofstream和ifstreamclasses 但它无法读取一些字符，如 9、13、32。如果有另一种方式来读取和写入主题。
采纳答案by Omnifarious
Here is a program that does this:
这是一个执行此操作的程序：
#include <iostream>
#include <fstream>
int main(int argc, const char *argv[])
{
if (argc < 2) {
::std::cerr << "Usage: " << argv[0] << "<filename>\n";
return 1;
}
::std::ifstream in(argv[1], ::std::ios::binary);
while (in) {
char c;
in.get(c);
if (in) {
::std::cout << "Read a " << int(c) << "\n";
}
}
return 0;
}
Here is an example of it being run in Linux:
这是它在 Linux 中运行的示例：
$ echo -ne '\x9\xd\x20\x9\xd\x20\n' >binfile
$ ./readbin binfile
Read a 9
Read a 13
Read a 32
Read a 9
Read a 13
Read a 32
Read a 10
回答by Stuart Golodetz
Open the file using the std::ios::binaryflag and then use readand writerather than the streaming operators.
使用std::ios::binary标志打开文件，然后使用readandwrite而不是流操作符。
There are some examples here:
这里有一些例子：
http://www.cplusplus.com/reference/iostream/istream/read/
http://www.cplusplus.com/reference/iostream/istream/read/
回答by gmas80
This is a basic example (without any error check!):
这是一个基本示例（没有任何错误检查！）：
// Required STL
#include <fstream>
using namespace std;
// Just a class example
class Data
{
int a;
double b;
};
// Create some variables as examples
Data x;
Data *y = new Data[10];
// Open the file in input/output
fstream myFile( "data.bin", ios::in | ios::out | ios::binary );
// Write at the beginning of the binary file
myFile.seekp(0);
myFile.write( (char*)&x, sizeof (Data) );
...
// Assume that we want read 10 Data since the beginning
// of the binary file:
myFile.seekg( 0 );
myFile.read( (char*)y, sizeof (Data) * 10 );
// Remember to close the file
myFile.close( );
