- 1 year ago
dir /r and output stream in Windows Machine
In Windows, the dir /r
command is used to display the contents of a directory, including any alternate data streams associated with the files. Alternate data streams are a feature in the NTFS file system that allows you to store data in named streams attached to a file.
To capture the output of the dir /r
command in C++, you can use the popen
function to execute the command and read the output stream. Here's an example of how to do it:
cpp#include <iostream>
#include <cstdio>
int main() {
// Open a pipe to execute the "dir /r" command and read its output
FILE* pipe = _popen("dir /r", "r");
if (!pipe) {
std::cerr << "Error opening pipe to command." << std::endl;
return 1;
}
// Read the output of the command line by line
char buffer[128];
while (!feof(pipe)) {
if (fgets(buffer, 128, pipe) != NULL) {
std::cout << buffer;
}
}
// Close the pipe
_pclose(pipe);
return 0;
}
In this example, the _popen
function is used to execute the dir /r
command and open a pipe to read its output. The output is read line by line using fgets
and printed to the console. Finally, the _pclose
function is used to close the pipe.
Please note that using _popen
and _pclose
is specific to Microsoft's Visual C++ compiler. If you are using a different compiler or platform, you may need to use different functions or techniques to capture the command output.