PrintScreenLogger¶

About¶

PrintScreenLogger is a DXE_DRIVER you can include in your platform to obtain Screen Captures during the preboot environment by pressing the Ctrl-PrtScn key combination. This action will creates a 24bbp (Bits Per Pixel) .BMP file of the screen's contents and write it to a enabled USB drive.

Supported Architectures¶

This package is not architecturally dependent. This package is dependent upon the Gop pixel format, and only supports these two pixel formats:

PixelRedGreenBlueReserved8BitPerColor
PixelBlueGreenRedReserved8BitPerColor

PrintScreenLogger operation¶

During initialization, the Print Screen Logger registers for notification of the Ctrl-PrtScn key combination is pressed.

When a Print Screen callback occurs:

Looks for a mounted USB drive that contains a file in the root directory called PrintScreenEnable.txt. This limits PrintScreenLogger to only write to enabled USB devices.
Looks for the next available filename in the form PrtScreen####.bmp, starting with 0000.
Creates the new PrtScreen####.bmp file.
Call GraphicsOutput->Blt to obtain the complete screen.
Converts the BLT buffer to a 24bbp BMP structure.
Writes the BMP structure to the new PrtScreen####.bmp file.

Including in your platform¶

Sample DSC change¶

    [Components.<arch>]
    ...
    ...
    MsGraphicsPkg/PrintScreenLogger/PrintScreenLogger.inf

Sample FDF change¶

    [FV.<a DXE firmware volume>]
    ...
    ...
    INF MsGraphicsPkg/PrintScreenLogger/PrintScreenLogger.inf