Adding NULL To This Code

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C++

This function is returning a count of files in the directory.....However If the file doesn't exsist the function breaks. How can I add NULL to this to cover no files of the type desired. I want it to return 0 if no files are found.

int count = GetFileList(L"C:\\Users\\DS\\Downloads\\*.pdf", map);

The function itself.

int GetFileList(const wchar_t *searchkey, std::map &map)

My apologies, here is the entire code.

struct file_data 
{ 
    std::wstring sLastAccessTime; 
    __int64 nFileSize      ; 
};
  
int GetFileList(const wchar_t *searchkey, std::map &map) 
{ 
    WIN32_FIND_DATA fd; 
    HANDLE h = FindFirstFile(searchkey,&fd); 
    if(h == INVALID_HANDLE_VALUE) 
    { 
        return 0; // no files found 
    } 
    while(1) 
    { 
       	wchar_t buf[128]; 
        FILETIME ft = fd.ftLastWriteTime; 
        SYSTEMTIME sysTime; 
        FileTimeToSystemTime(&ft, &sysTime); 
        wsprintf(buf, L"%d-%02d-%02d",sysTime.wYear, sysTime.wMonth, sysTime.wDay); 
		
	file_data filedata; 
        filedata.sLastAccessTime= buf; 
        filedata.nFileSize      = (((__int64)fd.nFileSizeHigh) << 32) + fd.nFileSizeLow; 
 
        map[fd.cFileName]= filedata; 
 
        if (FindNextFile(h, &fd) == FALSE) 
            break; 
    } 
    return map.size(); 
} 
 
int main() 
{ 
#define NULL 0;
	std::map map; 
        int count = GetFileList(L"C:\\Users\\DS\\Downloads\\*.pdf", map);
	int count1 = GetFileList(L"C:\\Users\\DS\\Downloads\\*.txt", map);
	int count2 = GetFileList(L"C:\\Users\\DS\\Downloads\\*.jpg", map);
	for(std::map::const_iterator it = map.begin(); 
        it != map.end(); ++it) 
    { 
       
		if (count != 0) 
		{ 
		printf("\n   Delete: %i   \n", count);
		} 
		else 
		{ 
		printf ("%s \n", "Nothing");
		
		    } 
	system("pause");
    return 0;
}
}