Win10 set up the system of DPI don't have to restart to take effect, do you have a set of API information?
We are trying to read system DPI before, now I want to return to set up the system of DPI to a want to the value of the
Change the registry way: no, thank you.

CodePudding user response:

Try EnumDisplaySettings ChangeDisplaySettings
The DEVMODE such description
DmPrintQuality
Specifies the printer resolution. There are four predefined device - independent values:
DMRES_HIGH
DMRES_MEDIUM
DMRES_LOW
DMRES_DRAFT
If a positive value is given, it specifies the number of dots per inch (DPI) and is therefore device dependent.
Actually I haven't tried, you can test under see

CodePudding user response:

No EnumDisplaySettngs, only EnumDisplaySettingA and EnumDisplaySettingsW two functions,

CodePudding user response:

Search
The Module name: DispRes. CPP
Written by: Jeffrey Richter
Notices: 1995 Written by Jeffrey Richter

CodePudding user response:

 
//Codes are to here for reading! Not *! 
Void CVcDispResDlg: : ChangeResolution () 
{
if(! M_bAllowToChange) return; 
//
LPCTSTR PSZ; 
UINT nMBBtn; 
//Keep the current refresh rate 
M_DevSelect. DmDisplayFrequency=GetDeviceCaps ((HDC) GetDC (), VREFRESH); 
//Attempt to change the display resolution. 
The switch (ChangeDisplaySettings (& amp; M_DevSelect CDS_UPDATEREGISTRY)) 
{
Case DISP_CHANGE_SUCCESSFUL: 
PSZ=__TEXT (" Display change successful. "); 
break; 

Case DISP_CHANGE_RESTART: 
PSZ=__TEXT (" You must restart your computer before the ") 
__TEXT (" the new Settings will take effect. \ n \ n ") 
__TEXT (" Do you want to restart your computer now?" ); 
NMBBtn=MB_YESNO; 
break; 

Case DISP_CHANGE_BADFLAGS: 
PSZ=__TEXT (" An invalid set of flags was passed in. "); 
break; 

Case DISP_CHANGE_FAILED: 
PSZ=__TEXT (" The display driver couldn 't change The display. "); 
break; 

Case DISP_CHANGE_BADMODE: 
PSZ=__TEXT (" gave Settings "); 
break; 

Case DISP_CHANGE_NOTUPDATED: 
PSZ=__TEXT (" Unable to write Settings to the registry. "); 
break; 
} 
//Show the user the results 
If (IDYES==AfxMessageBox (PSZ, nMBBtn | MB_ICONINFORMATION)) 
{//If the user wants to reboot the computer to do so. 
//Windows NT: We must enable our shutdown privilege, assumming We have it. 
//Windows 95: OpenProcessToken LookupPrivilegeValue, and 
//AdjustTokenPrivileges are not implemented and 
//are ignored. 
HANDLE hToken; 
The TOKEN_PRIVILEGES TKP; 
//We want to adjust our process 's privileges. 
OpenProcessToken (GetCurrentProcess (), TOKEN_ADJUST_PRIVILEGES, & amp; HToken); 
//Get the LUID for shutdown privilege 
LookupPrivilegeValue (NULL, SE_SHUTDOWN_NAME, & amp; TKP. Privileges [0]. Luid); 
TKP. PrivilegeCount=1;//one privilege to set 
TKP. Privileges [0]. Attributes=SE_PRIVILEGE_ENABLED; 
//Turn the SE_SHUTDOWN_NAME privilege on the for our process 
AdjustTokenPrivileges (hToken, FALSE, & amp; TKP, 0, NULL, 0); 
The CloseHandle (hToken); 
//Shut down and reboot the system. 
ExitWindowsEx (EWX_REBOOT, 0); 
} 
} 

CodePudding user response:

EnumDisplaySettings
The EnumDisplaySettings function obtains information about one of a display device 's graphics modes. You can obtain information for all of a display device' s graphics modes by making a series of calls to this function.

BOOL EnumDisplaySettings (
LPCTSTR lpszDeviceName,//specifies the display device
DWORD iModeNum,//specifies the graphics mode
LPDEVMODE LPDEVMODE//points to structure the to receive Settings
);

CodePudding user response:

SetDisplayConfig