Call CreateFileW() function return error 5 on UWP APP

Question

Hi Microsoft team,

I am developing a UWP app, the function is connected to my driver.

I try the way below.

But I get error=5, so can you help me?

Answer 1

Hi @zev young ,

Welcome to Microsoft Q&A!

Error code 5 (ERROR_ACCESS_DENIED), it appears when the user does not have sufficient permission to access the requested file or location. UWP runs in a sandbox and cannot directly access files like desktop applications.

CreateFileW() only support desktop apps, it's not supported in UWP. If you want to create file in UWP, you can use Windows.Storage.StorageFolder.CreateFileAsync. For more information you can refer to the document Create, write, and read a file.

If you want to access files outside the UWP application, you need to use Filepicker or open file access permissions. Please note that after using the broadFileSystemAccess capability, users need to manually open the permission in the App setting.

Thank you.

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