请教win10中设置系统DPI的API

[licunxijyy]

win10设置系统的DPI不用重启即可生效，请问有相关设置API的资料吗？
以往我们都是想方设法读取系统的DPI，现在我想反过来去设置系统的DPI到一个想要的值。
不用改注册表的方式，谢谢。

[zgl7903]

试试 EnumDisplaySettings ChangeDisplaySettings
DEVMODE 中 有这样的描述
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.
实际的我也没有试过， 你可以测试下看看

[schlafenhamster]

搜索
Module name: DispRes.cpp
Written by: Jeffrey Richter
Notices: Written 1995 by Jeffrey Richter

[schlafenhamster]

// Codes are shown here for reading ! not tested !
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.
	switch (ChangeDisplaySettings(&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("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("Invalid 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, 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;
        TOKEN_PRIVILEGES tkp;
        // We want to adjust our process's privileges.
        OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES, &hToken);
        // Get the LUID for shutdown privilege
        LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME, &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 for our process
        AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, NULL, 0);
        CloseHandle(hToken);
        // Shut down and reboot the system.
        ExitWindowsEx(EWX_REBOOT, 0);
	}
}

[schlafenhamster]

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 to receive settings
);

[Sabs]

没有EnumDisplaySettngs，只有EnumDisplaySettingA和EnumDisplaySettingsW两个函数。

[Eleven]

SetDisplayConfig