Lumia 950XL - Project My Screen not working after Win10 1803 Update - Black Screen

Anonymous
2018-05-17T12:08:56+00:00

I use my 950XL extensively for demos of my company's software because it's much better display than my iPhone and doesn't need additional apps to do it.

I updated my Win10 desktop today to 1803 and also my phone updated to .104 and the app no longer works.

When I open the app I get the message on the phone to ask if I want to share and I agree. The display on the desktop is black, but I can actually start applications on the phone by clicking inside the black window, so there obviously is a connection, just no display.

I was working perfectly, but not now.

As a workaround, is it possible to use continuum? I'm sure there used to be an option to display the phone's screen rather than a full desktop to the connected display but that appears to be no longer available

Thanks,

Chris

***Moved from: Mobile Devices / Microsoft Lumia and Nokia Lumia / Continuum / 900-series.***

Windows for home | Windows 10 | PC projection

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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  1. Anonymous
    2018-07-30T16:48:31+00:00

    nyama3310,

    Great job !!!! Tested the today's edition. Everything is fine !!!

    One small glitch : Avast says something like "the file is of rare type and they will analyze it" but it does not send it to the chest.

    No problem at all : I've just added the program folder to the Avast exclusion list.

    Whether MS fixes or not the original program, it does not matter to me anymore. This one is working OK and it is better ( more functionalities ). 

    Many thanks again.

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  2. Anonymous
    2018-07-30T13:06:20+00:00

    Hey that's really close!

    This is using a Lumia 950XL.

    It now displays an image and sends touches from the desktop, but unfortunately the image split in the middle.

    Portrait:

    Landscape:

    Please don't stop - it's nearly there!!

    And it doesn't crash the phone.

    Thanks,

    Chris

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  3. Anonymous
    2018-07-30T12:31:58+00:00

    Anyone, please tell me to know whether 2MB App wroks with 950 XL?

    BTW, I filnally implemented touch event sending to WP from PC.

    Backsapce and Home key are sended as well as.

    And It' would be my final piece about this issue.

    Enjoy it!:)

    https://1drv.ms/f/s!AsNY9CSRTH0roqhZlAT6e9xFN8KmHg

     -> WinPhoneProjection-nyama3310.zip

    Crippa,

    Oh sorry, I can rename easily *.exe but it's difficult to rename *.dll

    because it's loaded from *.exe by name.

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  4. Anonymous
    2018-07-21T01:42:46+00:00

    Nyama3310, thanks for your effort.

    I tested the new version with 2MB buffer. There is no difference from before.

    But....good news.  When I connect the phone and display the setting screen, the characters look bad. But if I rotate the phone to landscape mode and back to portrait, everything looks fine.

    See the captured image AFTER the rotation to landscape and back to portrait :

    Just compare this with the image on my previous append. 

    This trick works also with the 512 KB buffer App. 

    Furthermore, I now have a Lumia650 (it is an used one, I purchased it as spare..) . I did the same testing : all I wrote about Lumia 640XL does apply to Lumia 650 as well.. no differences.

    I just insert an image from Lumia 650 here ( this is a dual SIM phone, thus there are two icons in the top row)   .:

    Nyama3310, may I kindly ask you one thing : if you compile new versions, please make sure to change the name of the .exe file... and not the zipped file name only... otherwise it is very easy to get lost.... many thanks again !!!!

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  5. Anonymous
    2018-07-20T23:18:11+00:00

    Thanks to your reply, ChrisHxx & Aurelio ;)

    The following items make me suspect that memory shortage is the cause of the problem.

    • WP81ProjectionClient_Test  does not work both 950 XL and 640 XL.
    • WP81ProjectionClient works with 640 XL but image is bad quality.

    As you mentioned before, the buffer size is currently 512 KB.

    #define PROJECTION_CLIENT_MAX_IMAGE_BUF_SIZE 0xC8600 //854 * 480(16bit)

    I change it to 2MB to suit for 950 XL and make new build.

    #define PROJECTION_CLIENT_MAX_IMAGE_BUF_SIZE (2*1024*1024)

    https://1drv.ms/f/s!AsNY9CSRTH0roqhZlAT6e9xFN8KmHg

     -> WinPhoneProjection-nyama3310_2M.zip

    Please try it and let me know any change.

    BTW, The following items are probably caused by a bug in WinUSB.

    • the app on the PC takes a while to start and to display its windows. Say some 15 seconds. But not always.(?)

    We casn't stop capture transfer even if we send finish command.

    1. First time, we succeed to start capture but finishing is fail.
    2. Second time, we must wait starting because previous transfer is still alive.
    3. Third time, phone reboot because too many transfers are alive.

    That's why phone reboots about 33%(1/3 times) and unplug cable is effective workaround.

    If you use it in V.1709, any problem is never occured.

    And one more:

    • no input recognized from PC to phone. In other words PC mouse is not recognized by the PC app

    That’s natural because there aren't any code about input;(

    But I found some data send via WinUsb_Write cause phone touch event.

    We can input remotely from PC if we convert touch event  to WinUsb_Write data.

    I'll try it but I may not be able to do that because conversion seems to be too complex.

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