I have been trying to print out all connected storage devices to my machine using C++ and libparted on Linux Mint 22 x86_64.
I have been tinkering with the ped_device_get_next() function, that should return the next device in the list provided by the ped_device_probe_all() function. I have trouble getting this to work, since the documentation on this library is pretty poor.
The most useful thing I’ve gotten to work is this simple chunk of code.
#include <cmakeconfig.h>
#include "mainheader.h"
int main()
{
ped_device_probe_all();
PedDevice *tempbed;
int c = 0;
do {
tempbed = ped_device_get_next(NULL);
std::cout<<c<<" "<<tempbed->model<<"n";
c++;
} while(tempbed != NULL && c < 256);
return 0;
}
And all it does is print out the model of my SSD 256 times. Without the c variable acting as a safety mechanism, it does it forever (until the resources run out I guess).
It does not print out the model of my HDD anywhere.
I know that my code does exactly what the documentation says, prints out the first device x times, but I just cannot figure out how to make it print out the devices consecutively.
0 <model name>
1 <model name>
2 <model name>
3 <model name>
4 <model name>
etc.
Documentation of ped_device_get_next
Hubert Gonera is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
You initially call ped_device_get_next(NULL); Then on subsequent calls, you pass the value it returned on the previous call. One way to do this would be something like this:
int main()
{
ped_device_probe_all();
PedDevice *tempbed = nullptr;
int c = 0;
while((tempbed = ped_device_get_next(tempbed))!= nullptr && c <255) {
std::cout<<c<<" "<<tempbed->model<<"n";
c++;
}
return 0;
}
…or you could wrap it up onto a class that imitates a container:
#include <parted/parted.h>
class devices {
public:
class iterator {
PedDevice *current = nullptr;
public:
iterator &operator++() {
current = ped_device_get_next(current);
return *this;
}
PedDevice &operator*() const { return *current; }
bool operator!=(iterator const &other) const {
return current != other.current;
}
};
devices() { ped_device_probe_all(); }
iterator begin() {
iterator i;
return ++i;
}
iterator end() { return iterator(); }
};
…then iterate over it like almost any other container:
int main()
{
for (auto d : devices()) {
std::cout << d.model << "n";
}
}