Get information about logical drives (UWP, C#, Windows)

Question

I am creating a UWP app (C#, Windows, Visual Studio 2019). I want to list the available space, total space and total free space of the logical drives (for example, the drives are C, D, E). In order to do this, I have used DLLs that contain GetDiskFreeSpaceExA . I tried 2 things: DllImport with kernel32.dll and DllImport with a DLL file that I have created.

1. Firstly, I have called this function using kernel32.dll

    [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)] [return: MarshalAs(UnmanagedType.Bool)] static extern bool GetDiskFreeSpaceEx(String drivePath, out ULARGE_INTEGER availableBytes, out ULARGE_INTEGER totalBytes, out ULARGE_INTEGER totalFreeBytes);

2. Secondly, I have created a C DLL using Windows Desktop Wizard and added it to the UWP app. The name of the DLL file is GetMemory.dll. The function GetSpaceData calls GetDiskFreeSpaceExA

   [DllImport("GetMemory.dll", EntryPoint = "GetSpaceData", CallingConvention = CallingConvention.Cdecl)]

   internal static extern int GetSpaceData(string drivePath, out ULARGE_INTEGER availableBytes, out ULARGE_INTEGER totalBytes, out ULARGE_INTEGER totalFreeBytes);

This is the C file used to create the DLL file:

__declspec(dllexport) int GetSpaceData(char* path, 
                                       ULARGE_INTEGER *ulFreeForUser, 
                                       ULARGE_INTEGER *ulTotal,
                                       ULARGE_INTEGER *ulFree)
{
        if (GetDiskFreeSpaceExA(path, ulFreeForUser, ulTotal, ulFree))
        {
            return 1;
        }
        return 0;
}

In both cases, I can only access the data about C drive (I have to access space data about E and D drives, too): the result from the functions is true and:= 0 for "C:" and false and == 0 for "D:" and "E.".

I have also tried to access them using the C# code in UWP, but failed. Getting the storage data about the logical drives, using dlls and GetDiskFreeSpaceExA , in a C# Console App works.

Why can I only access the data about C drive (UWP)? How can I access the data for all of the logical drives (UWP)?

Answer 1

You could add the broadFileSystemAccess capability in Package.appxmanifest.
In addition, broadFileSystemAccess is a restricted capability. You need to configure in Settings > Privacy > File system.

Then please refer to the answer of this question , the description of this solution as follows:

1. Call DriveInfo.GetDrives() to retrieve the drive names of all logical drives on a computer.
2. Traverse all Drives and use StorageFolder.GetFolderFromPathAsync() to get the root folder of each disk.
3. Get the specified properties through
   StorageItemContentProperties.RetrievePropertiesAsync() .