是否可以从Win32或MFC应用程序的Windows中获取“磁盘空间不足”通知？

Question

I have a MFC application which is actually show files of connected USB devices. Multi-filter Drag and Drop is enabled for this application and works perfectly except “Low Level Disk” warning from Windows. It can drag files from PC to MFC Application and MFC Application to PC . When “Low Level Disk Space” warning is showing from PC, Drag and Drop is not working and Application get crushed even enough memory is available to paste/drop the files. I have checked that there is enough memory is available before dropping the dragged files.

After googling I have found this link that states,

Windows is not allowing to copy/paste due to “Low Level Disk Space” warning even you have enough space to copy/paste the files.

So I have to consider “Low Level Disk Space” memory size also beside my dragged file size. But I didn't find any answer about the below questions:

1. What is the Minimum level amount of memory need to avoid “LowLeveDiskSpace” warning?
2. Is there any way to get this “LowLeveDiskSpace” notification through MFC or Win32 application?

Answer 1

I doubt this is documented.

The shell calls StringCchPrintfW on a L"LowDiskOn%C" format string where the %C parameter is a upper-case drive letter. It uses that string to wait on a named mutex. I'm not sure if the shell itself periodically checks the free space or if the mutex is signaled by something else.

The implementation has probably changed over the years.