EnumDisplaySettings

[TimoVJL]

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; ml.exe -coff hello.asm -link -subsystem:console
.386
.model flat
option casemap:none
exit PROTO C :DWORD
printf PROTO C :PTR,:VARARG
INCLUDELIB msvcrt

EnumDisplaySettingsA PROTO STDCALL :PTR, :DWORD, :PTR
INCLUDELIB user32.lib

POINTL struct
x DWORD ?
y DWORD ?
POINTL ends

DEVMODEX        struct
dmDeviceName    BYTE 32 dup (?)
dmSpecVersion   WORD    ?
dmDriverVersion WORD    ?
dmSize  WORD    ?
dmDriverExtra   WORD    ?
dmFields        DWORD   ?
union
struct
dmOrientation   SWORD   ?
dmPaperSize     SWORD   ?
dmPaperLength   SWORD   ?
dmPaperWidth    SWORD   ?
ends
dmPosition      POINTL  <?>
ends
dmScale SWORD   ?
dmCopies        SWORD   ?
dmDefaultSource SWORD   ?
dmPrintQuality  SWORD   ?
dmColor SWORD   ?
dmDuplex        SWORD   ?
dmYResolution   SWORD   ?
dmTTOption      SWORD   ?
dmCollate       SWORD   ?
dmFormName      BYTE 32 dup (?)
dmLogPixels     WORD    ?
dmBitsPerPel    DWORD   ?
dmPelsWidth     DWORD   ?
dmPelsHeight    DWORD   ?
union
dmDisplayFlags  DWORD   ?
dmNup   DWORD   ?
ends
dmDisplayFrequency      DWORD   ?
dmICMMethod     DWORD   ?
dmICMIntent     DWORD   ?
dmMediaType     DWORD   ?
dmDitherType    DWORD   ?
dmReserved1     DWORD   ?
dmReserved2     DWORD   ?
dmPanningWidth  DWORD   ?
dmPanningHeight DWORD   ?
DEVMODEX        ends

.data
msg db "%d x %d",10,0
dev db "\\.\DISPLAY1",0
dm DEVMODEX <<?>>

.code
mainCRTStartup PROC C
;invoke EnumDisplaySettingsA, ADDR dev, -1, ADDR dm
invoke EnumDisplaySettingsA, 0, -1, ADDR dm
invoke printf, ADDR msg, dm.dmPelsWidth, dm.dmPelsHeight
invoke exit,0
mainCRTStartup ENDP
END mainCRTStartup

EDIT: fix for default monitor without device name

[Vortex]

Hi Timo,

Many thanks, attached is the project built with Poasm. There are some minor modifications in the code, I hope you don't mind.

Running the executable, I get :

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0 x 0

[TimoVJL]

Thanks
In my system it gave 1920 x 1080

EDIT:
libs are useful for this testbed
https://forum.pellesc.de/index.php?topic=11474.msg40487#msg40487

[Vortex]

Hi Timo,

Thanks, I tested your 32-bit version of msvcrt.lib. The result is the same on my Windows 7 Sp1 64-bit system :

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0 x 0

EDIT : Here is the fixed version following Timo's recommendation to set the driver name to NULL.

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1366 x 768

[TimoVJL]

My system is also Windows 7 SP1 x64.
Those msvcrt.libs was for common usage for those, who don't have them currently.

[Vortex]

Hi Timo,

Compiling the code here with Pelles C :

https://masm32.com/board/index.php?topic=12507.0

the result is :

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2130567168 x 5211864

[TimoVJL]

Other test code for device name, to see if it differ

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#define WINVER 0x0500
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>

#pragma comment(lib, "user32.lib")

BOOL WINAPI EnumMon(HMONITOR unnamedParam1, HDC unnamedParam2, LPRECT unnamedParam3, LPARAM unnamedParam4)
{
MONITORINFO mi;
mi.cbSize = sizeof(mi);
GetMonitorInfo(unnamedParam1, &mi);
printf("%d x %d\n", mi.rcMonitor.right, mi.rcMonitor.bottom);
return 0;
}

int __cdecl main(void)
{
DISPLAY_DEVICE dd;
DEVMODE dm;
TCHAR szDeviceName[33];
dd.cb = sizeof(dd);
EnumDisplayDevices(NULL, 0, &dd, 0);
lstrcpyn(szDeviceName, dd.DeviceName, 33);
printf("%s\n", szDeviceName);
EnumDisplayDevices(szDeviceName, 0, &dd, 0);
printf("%s\n", dd.DeviceString);
dm.dmSize = sizeof(dm);
EnumDisplaySettings(szDeviceName, ENUM_CURRENT_SETTINGS, &dm);
printf("%d x %d\n", dm.dmPelsWidth, dm.dmPelsHeight);
EnumDisplayMonitors(NULL, NULL, &EnumMon, 0);
return 0;
}

shame, that examples didn't work out of box and needs fixings.

EDIT: perhaps this is better ?

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#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>

#pragma comment(lib, "user32.lib")

int __cdecl printf(const char * restrict, ...);

int __cdecl main(void)
{
DISPLAY_DEVICE dd;
DEVMODE dm;
dd.cb = sizeof(dd);
EnumDisplayDevices(NULL, 0, &dd, 0);
printf("%s\n", dd.DeviceName);
dm.dmSize = sizeof(dm);
//EnumDisplaySettings(dd.DeviceName, ENUM_CURRENT_SETTINGS, &dm);
EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
printf("%d x %d\n", dm.dmPelsWidth, dm.dmPelsHeight);
return 0;
}

This worked in my Windows 7 with empty DISPLAY_DEVICE struct or 0 for default monitor

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; ml.exe -coff EnumDisplaySetting.asm -link -subsystem:console
.386
.model flat
option casemap:none
exit PROTO C :DWORD
printf PROTO C :PTR,:VARARG
INCLUDELIB msvcrt

EnumDisplaySettingsA PROTO STDCALL :PTR, :DWORD, :PTR
INCLUDELIB user32.lib


DISPLAY_DEVICEX struct
cb           DWORD ?
DeviceName   BYTE 32 dup (?)
DeviceString BYTE 128 dup (?)
DeviceID     BYTE 128 dup (?)
DeviceKey    BYTE 128 dup (?)
DISPLAY_DEVICEX ends

POINTL struct
x DWORD ?
y DWORD ?
POINTL ends

DEVMODEX        struct
dmDeviceName    BYTE 32 dup (?)
dmSpecVersion   WORD    ?
dmDriverVersion WORD    ?
dmSize  WORD    ?
dmDriverExtra   WORD    ?
dmFields        DWORD   ?
union
struct
dmOrientation   SWORD   ?
dmPaperSize     SWORD   ?
dmPaperLength   SWORD   ?
dmPaperWidth    SWORD   ?
ends
dmPosition      POINTL  <?>
ends
dmScale SWORD   ?
dmCopies        SWORD   ?
dmDefaultSource SWORD   ?
dmPrintQuality  SWORD   ?
dmColor SWORD   ?
dmDuplex        SWORD   ?
dmYResolution   SWORD   ?
dmTTOption      SWORD   ?
dmCollate       SWORD   ?
dmFormName      BYTE 32 dup (?)
dmLogPixels     WORD    ?
dmBitsPerPel    DWORD   ?
dmPelsWidth     DWORD   ?
dmPelsHeight    DWORD   ?
union
dmDisplayFlags  DWORD   ?
dmNup   DWORD   ?
ends
dmDisplayFrequency      DWORD   ?
dmICMMethod     DWORD   ?
dmICMIntent     DWORD   ?
dmMediaType     DWORD   ?
dmDitherType    DWORD   ?
dmReserved1     DWORD   ?
dmReserved2     DWORD   ?
dmPanningWidth  DWORD   ?
dmPanningHeight DWORD   ?
DEVMODEX        ends

.data
msg db "%d x %d",10,0
ddx DISPLAY_DEVICEX <?>
dm DEVMODEX <<?>>

.code
mainCRTStartup PROC C
invoke EnumDisplaySettingsA, 0, -1, ADDR dm
;invoke EnumDisplaySettingsA, ddx.DeviceName, -1, ADDR dm
invoke printf, ADDR msg, dm.dmPelsWidth, dm.dmPelsHeight
invoke exit,0
mainCRTStartup ENDP
END mainCRTStartup


[Vortex]

Hi Timo,

When the driver name is set to NULL, I get the correct result. Many thanks.

Code Select Expand

1366 x 768