Using IPlatformFile::IterateDirectory

Development Programming & Scripting
4

I’m sure someone’s going to advise me to do something different, but for now I’m trying to use the WinAPI to accomplish my goals. I found some good information at Displaying Volume Paths - Win32 apps | Microsoft Docs and hacked something out of that.

MyTestObject.h

#include "Object.h"
#include "MyTestObject.generated.h"

UCLASS(NotPlaceable)
class UMyTestObject : public UObject
{
	GENERATED_UCLASS_BODY()

	/* Returns an array of strings with available physical drive paths, i.e. A:\ or C:\
	No networked/mapped drives */
	UFUNCTION(BlueprintPure, meta = (FriendlyName = "Get Drive Paths", Keywords = "Array String Drive Paths"), Category = "MyNodes|FileManagement")
	static TArray<FString> GetDrivePaths();
};

…and MyTestObject.cpp

#include "MyTestObject.h"

UMyTestObject::UMyTestObject(const class FPostConstructInitializeProperties& PCIP)
	: Super(PCIP)
{
}

TArray<FString> UMyTestObject::GetDrivePaths()
{
	TArray<FString> DrivePaths;
	uint32 CharCount = 0;
	WCHAR DeviceName[MAX_PATH] = L"";
	uint32 Error = ERROR_SUCCESS;
	HANDLE FindHandle = INVALID_HANDLE_VALUE;
	BOOL Found = false;
	size_t Index = 0;
	BOOL Success = false;
	WCHAR VolumeName[MAX_PATH] = TEXT("");

	// Enumerate all volumes in the system
	FindHandle = FindFirstVolumeW(VolumeName, ARRAYSIZE(VolumeName));

	if (FindHandle == INVALID_HANDLE_VALUE)
	{
		Error = GetLastError();
		// wprintf(L"FindFirstVolumeW failed with error code %d", Error);
		DrivePaths.Empty();
		return DrivePaths;
	}

	do 
	{
		// Skip the \\?\\ prefix and remove the trailing backslash
		Index = wcslen(VolumeName) - 1;

(to be continued)