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The WM_DEVMODECHANGE message is sent to all top-level windows whenever the user changes device-mode settings.

A window receives this message through its WindowProc function. 

Notifies an application of a change to the hardware configuration of a device or the computer.

A window receives this message through its WindowProc function. 

The device context is updated from the information specified in the Windows DEVMODE structure. This member function only resets the attribute device context.

An application will typically use the ResetDC member function when a window processes a WM_DEVMODECHANGE message. You can also use this member function to change the paper orientation or paper bins while printing a document.

You cannot use this member function to change the driver name, device name, or output port. When the user changes the port connection or device name, you must delete the original device context and create a new device context with the new information.

Before you call this member function, you must ensure that all objects (other than stock objects) that had been selected into the device context have been selected out.

BOOL WINAPI WritePrivateProfileString(

  _In_ LPCTSTR lpAppName,

  _In_ LPCTSTR lpKeyName,

  _In_ LPCTSTR lpString,

  _In_ LPCTSTR lpFileName

); 

DWORD WINAPI GetPrivateProfileString(

  _In_  LPCTSTR lpAppName,

  _In_  LPCTSTR lpKeyName,

  _In_  LPCTSTR lpDefault,

  _Out_ LPTSTR  lpReturnedString,

  _In_  DWORD   nSize,

  _In_  LPCTSTR lpFileName

); 

BOOL PathFileExists(

  _In_ LPCTSTR pszPath

); 

C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude -CC:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -cstk500 -PCOM6 -e -Ulock:w:0x3F:m -Uefuse:w:0x05:m -Uhfuse:w:0xDA:m -Ulfuse:w:0xFF:m

-U memtype:op:filename[:format]

Perform a memory operation. Multiple ‘-U’ options can be specified in order to operate on multiple memories on the same command-line invocation. The memtype field specifies the memory type to operate on. Use the ‘-v’ option on the command line or the part command from terminal mode to display all the memory types supported by a particular device. Typically, a device’s memory configuration at least contains the memory types flash and eeprom. All memory types currently known are:

calibration

One or more bytes of RC oscillator calibration data.

eeprom

The EEPROM of the device.

efuse

The extended fuse byte.

flash

The flash ROM of the device.

fuse

The fuse byte in devices that have only a single fuse byte.

hfuse

The high fuse byte.

lfuse

The low fuse byte.

lock

The lock byte.

signature

The three device signature bytes (device ID).

fuseN

The fuse bytes of ATxmega devices, N is an integer number for each fuse supported by the device.

application

The application flash area of ATxmega devices.

apptable

The application table flash area of ATxmega devices.

boot

The boot flash area of ATxmega devices.

prodsig

The production signature (calibration) area of ATxmega devices.

usersig

The user signature area of ATxmega devices.

The op field specifies what operation to perform:

r

read the specified device memory and write to the specified file

w

read the specified file and write it to the specified device memory

v

read the specified device memory and the specified file and perform a verify operation

The filename field indicates the name of the file to read or write. The format field is optional and contains the format of the file to read or write. Possible values are:

i

Intel Hex

s

Motorola S-record

r

raw binary; little-endian byte order, in the case of the flash ROM data

e

ELF (Executable and Linkable Format), the final output file from the linker; currently only accepted as an input file

m

immediate mode; actual byte values specified on the command line, separated by commas or spaces in place of the filename field of the ‘-U’ option. This is useful for programming fuse bytes without having to create a single-byte file or enter terminal mode. If the number specified begins with 0x, it is treated as a hex value. If the number otherwise begins with a leading zero (0) it is treated as octal. Otherwise, the value is treated as decimal.

a

auto detect; valid for input only, and only if the input is not provided at stdin.

d

decimal; this and the following formats are only valid on output. They generate one line of output for the respective memory section, forming a comma-separated list of the values. This can be particularly useful for subsequent processing, like for fuse bit settings.

h

hexadecimal; each value will get the string 0x prepended.

o

octal; each value will get a 0 prepended unless it is less than 8 in which case it gets no prefix.

b

binary; each value will get the string 0b prepended.

The default is to use auto detection for input files, and raw binary format for output files.

Note that if filename contains a colon, the format field is no longer optional since the filename part following the colon would otherwise be misinterpreted as format.

As an abbreviation, the form -U filename is equivalent to specifying -U flash:w:filename:a. This will only work if filename does not have a colon in it. 

C:\win32_executable>avrdude -cusbasp -Pusb -pm128 -v

avrdude: Version 6.3, compiled on Feb 17 2016 at 09:25:53

         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/

         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "C:\win32_executable\avrdude.conf"

         Using Port                    : usb

         Using Programmer              : usbasp

avrdude: error: could not find USB device with vid=0x16c0 pid=0x5dc vendor='www.fischl.de' product='USBasp'

avrdude done.  Thank you.

C:\win32_executable>avrdude -cusbasp -Pusb -pm128 -v

avrdude: Version 6.3, compiled on Feb 17 2016 at 09:25:53

         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/

         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "C:\win32_executable\avrdude.conf"

         Using Port                    : usb

         Using Programmer              : usbasp

         AVR Part                      : ATmega128

         Chip Erase delay              : 9000 us

         PAGEL                         : PD7

         BS2                           : PA0

         RESET disposition             : dedicated

         RETRY pulse                   : SCK

         serial program mode           : yes

         parallel program mode         : yes

         Timeout                       : 200

         StabDelay                     : 100

         CmdexeDelay                   : 25

         SyncLoops                     : 32

         ByteDelay                     : 0

         PollIndex                     : 3

         PollValue                     : 0x53

         Memory Detail                 :

                                  Block Poll               Page                       Polled

           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack

           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------

           eeprom         4    12    64    0 no       4096    8      0  9000  9000 0xff 0xff

           flash         33     6   128    0 yes    131072  256    512  4500  4500 0xff 0xff

           lfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00

           hfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00

           efuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00

           lock           0     0     0    0 no          1    0      0  9000  9000 0x00 0x00

           calibration    0     0     0    0 no          4    0      0     0     0 0x00 0x00

           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : usbasp

         Description     : USBasp, http://www.fischl.de/usbasp/

avrdude: auto set sck period (because given equals null)

avrdude: warning: cannot set sck period. please check for usbasp firmware update.

avrdude: error: program enable: target doesn't answer. 1

avrdude: initialization failed, rc=-1

         Double check connections and try again, or use -F to override

         this check.

avrdude done.  Thank you.

case WM_DPICHANGED: 

{ 

    // Find the button and resize it 

    HWND hWndButton = FindWindowEx(hWnd, NULL, NULL, NULL); 

    if (hWndButton != NULL) 

    { 

        UpdateButtonLayoutForDpi(hWndButton); 

    } 

}  

GetDeviceCaps(hdcScreen, LOGPIXELSX);

GetDeviceCaps(hdcScreen, LOGPIXELSY); 

int GetDeviceCaps(

  _In_ HDC hdc,

  _In_ int nIndex

);

LOGPIXELSX

Number of pixels per logical inch along the screen width. In a system with multiple display monitors, this value is the same for all monitors.

LOGPIXELSY

Number of pixels per logical inch along the screen height. In a system with multiple display monitors, this value is the same for all monitors.

Minimum supported client

Windows 2000 Professional [desktop apps only]