如何在整个驱动器上获取文件

Question

我编写了一个代码来遍历驱动器以查找特定扩展名的文件，如果文件是fount，它将被添加到列表框中，但代码在找到目录时失败了。迭代停止，文件不是目录。我希望我的程序使用给定的扩展名搜索文件，即使在目录和子目录中，我该怎么办？

这是我的代码

我的代码中看到的变量缓冲区只不过是驱动器字符串，例如H：\ count = 0;

int Class::countOfDocuments(wchar_t buffer[10])
{
    wchar_t driveString[MAX_PATH + 1] = { 0 };
    wcsncat_s(driveString,260,buffer,260);
    wcsncat_s(driveString, 260, L"*doc", 260);
    WIN32_FIND_DATA documents;
    HANDLE hFind; bool var = true;
    hFind = FindFirstFile(driveString, &documents);
    if (INVALID_HANDLE_VALUE == hFind)
    {
        wchar_t* no = L"No documents found";
        SendMessage(list1, LB_ADDSTRING, NULL, (LPARAM)no);
        for (int i = 0; i <= 10; i++)
        {
            SendMessage(cprogress, PBM_SETRANGE, 0, i);
            SendMessage(cprogress, PBM_SETSTEP, (WPARAM)1, 0);
            SendMessage(cprogress, PBM_STEPIT, 0, 1);
        }
        return count = -1;
    }
    else
    {
        wchar_t* Yes = L"Document found";
        perform = true;
        SendMessage(list1, LB_ADDSTRING, NULL, (LPARAM)Yes);
        while (var = FindNextFile(hFind, &documents) == TRUE)
        {
            count++;
        }

        for (int i = 0; i <= count; i++)
        {
            SendMessage(cprogress, PBM_SETRANGE, 0, i);
            SendMessage(cprogress, PBM_SETSTEP, (WPARAM)1, 0);
            SendMessage(cprogress, PBM_STEPIT, 0, 1);
            wchar_t* doc = L"Document found";
            SendMessage(list1, LB_ADDSTRING, NULL, (LPARAM)doc);
        }
        wchar_t* z = L"search complete";
        SendMessage(list1, LB_ADDSTRING, NULL, (LPARAM)z);
}
    return count;
}