Recursive function call issue

I have the following incomplete recursive function:

String* all_files(String* sDir)[]
{
		String* f[] = Directory::GetFiles(sDir);
		int numFiles = f->get_Length();

		String* d[] = Directory::GetDirectories(sDir);
		int numDirs = d->get_Length();

		for (int j=0; j < numDirs; j++)
		{
			all_files(d[j]);
		}

		return files;
}

The above is supposed to return the full list of files in sDir. What it does successfully is going through every single file in sDir (including the files in sub-directories). What it doesn't is returning what it is supposed to return: an array containing the full path of all the files in sDir. The variable "files" is undefined because I wasn't sure where would be the best place to define it. Btw the above is written in C++, but using mscorlib.dll which makes it pretty much a C# code.

So my question is, what can I add to my function so that it achieves what it is supposed to achieve The problem is mainly due to the recursiveness of the function.

Any help is appreciated.

Visual C++15

Since it is a recursive function you cannot return the list of files, you need to pass a list as a parameter and that list will be filled in:

void all_files(String* sDir, ArrayList *files)

{

files->AddRange(Directory::GetFiles(sDir));

String* d[] = Directory::GetDirectories(sDir);

int numDirs = d->get_Length();

for (int j = 0; j < numDirs; j++)

{

all_files(d[j], files);

}

Thanks for your help. However I managed to solve it (the func name is changed to return_all_files):

/* Returns an array of strings containing all the files and their hash values
in the passed folder. The passed value to count should be 0.
Format of the array: {File1, Hash1, File2, Hash2, ...} */
String* return_all_files(String* sDir, int &count, String* files[] )[]
{
String* f[] = Directory::GetFiles(sDir);
int numFiles = f->get_Length();

for (int k=0; k < numFiles; k++){
files[count] = f[k];
files[count+1] = MD5hash(f[k]);
count+=2;
}

// Find the subfolders in the folder that is passed in.
String* d[] = Directory::GetDirectories(sDir);
int numDirs = d->get_Length();

for (int j=0; j < numDirs; j++)
{
return_all_files(d[j], count, files);
}

delete [] f;
delete [] d;
return files;
}

OK, but I'm curious what are you passing in for the files parameter, more specifically what size is the array that you pass in !!

I use the following to define the array of strings to be passed for files[]:

String* temp [] = new String __gc* [(num_files*2)];

The variable num_files is calculated using some other algorithm that determines what the size of files[] is supposed to be when total_num_files() is called. So it is a pre-calculated value.