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Implement IntChangeDisplaySettings in a crappy way. Feel free to improve it!

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svn path=/trunk/; revision=14325
This commit is contained in:
Hervé Poussineau 2005-03-25 23:23:35 +00:00
parent 554ba464bc
commit f51f04e53e
1 changed files with 105 additions and 2 deletions
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107
reactos/subsys/win32k/objects/dc.c
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@ -2538,8 +2538,111 @@ IntChangeDisplaySettings(
break;
case CDS_UPDATEREGISTRY:
Ret = DISP_CHANGE_FAILED;
break;
{
UNICODE_STRING ObjectName;
UNICODE_STRING KernelModeName;
WCHAR KernelModeNameBuffer[256];
UNICODE_STRING RegistryKey;
WCHAR RegistryKeyBuffer[512];
PDEVICE_OBJECT DeviceObject;
NTSTATUS Status;
ULONG LastSlash;
OBJECT_ATTRIBUTES ObjectAttributes;
HANDLE DevInstRegKey;
ULONG NewValue;
/* Get device name (pDeviceName is "\.\xxx") */
for (LastSlash = pDeviceName->Length / sizeof(WCHAR); LastSlash > 0; LastSlash--)
{
if (pDeviceName->Buffer[LastSlash - 1] == L'\\')
break;
}
if (LastSlash == 0) return DISP_CHANGE_FAILED;
ObjectName = *pDeviceName;
ObjectName.Length -= LastSlash * sizeof(WCHAR);
ObjectName.MaximumLength -= LastSlash * sizeof(WCHAR);
ObjectName.Buffer += LastSlash;
KernelModeName.Length = 0;
KernelModeName.MaximumLength = sizeof(KernelModeNameBuffer);
KernelModeName.Buffer = KernelModeNameBuffer;
/* Open \??\xxx (ex: "\??\DISPLAY1") */
Status = RtlAppendUnicodeToString(&KernelModeName, L"\\??\\");
if (!NT_SUCCESS(Status)) return DISP_CHANGE_FAILED;
Status = RtlAppendUnicodeStringToString(&KernelModeName, &ObjectName);
if (!NT_SUCCESS(Status)) return DISP_CHANGE_FAILED;
Status = ObReferenceObjectByName(
&KernelModeName,
OBJ_CASE_INSENSITIVE,
NULL,
0,
IoDeviceObjectType,
KernelMode,
NULL,
(PVOID*)&DeviceObject);
if (!NT_SUCCESS(Status)) return DISP_CHANGE_FAILED;
/* Get associated driver name (ex: "VBE") */
for (LastSlash = DeviceObject->DriverObject->DriverName.Length / sizeof(WCHAR); LastSlash > 0; LastSlash--)
{
if (DeviceObject->DriverObject->DriverName.Buffer[LastSlash - 1] == L'\\')
break;
}
if (LastSlash == 0) { ObDereferenceObject(DeviceObject); return DISP_CHANGE_FAILED; }
ObjectName = DeviceObject->DriverObject->DriverName;
ObjectName.Length -= LastSlash * sizeof(WCHAR);
ObjectName.MaximumLength -= LastSlash * sizeof(WCHAR);
ObjectName.Buffer += LastSlash;
RegistryKey.Length = 0;
RegistryKey.MaximumLength = sizeof(RegistryKeyBuffer);
RegistryKey.Buffer = RegistryKeyBuffer;
/* Open registry key */
Status = RtlAppendUnicodeToString(&RegistryKey,
L"\\Registry\\Machine\\SYSTEM\\CurrentControlSet\\Hardware Profiles\\Current\\System\\CurrentControlSet\\Services\\");
if (!NT_SUCCESS(Status)) { ObDereferenceObject(DeviceObject); return DISP_CHANGE_FAILED; }
Status = RtlAppendUnicodeStringToString(&RegistryKey, &ObjectName);
if (!NT_SUCCESS(Status)) { ObDereferenceObject(DeviceObject); return DISP_CHANGE_FAILED; }
Status = RtlAppendUnicodeToString(&RegistryKey,
L"\\Device0");
if (!NT_SUCCESS(Status)) { ObDereferenceObject(DeviceObject); return DISP_CHANGE_FAILED; }
InitializeObjectAttributes(&ObjectAttributes, &RegistryKey,
OBJ_CASE_INSENSITIVE, NULL, NULL);
Status = ZwOpenKey(&DevInstRegKey, GENERIC_READ | GENERIC_WRITE, &ObjectAttributes);
ObDereferenceObject(DeviceObject);
if (!NT_SUCCESS(Status)) return DISP_CHANGE_FAILED;
/* Update needed fields */
if (NT_SUCCESS(Status) && DevMode->dmFields & DM_BITSPERPEL)
{
RtlInitUnicodeString(&RegistryKey, L"DefaultSettings.BitsPerPel");
NewValue = DevMode->dmBitsPerPel;
Status = ZwSetValueKey(DevInstRegKey, &RegistryKey, 0, REG_DWORD, &NewValue, sizeof(NewValue));
}
if (NT_SUCCESS(Status) && DevMode->dmFields & DM_PELSWIDTH)
{
RtlInitUnicodeString(&RegistryKey, L"DefaultSettings.XResolution");
NewValue = DevMode->dmPelsWidth;
Status = ZwSetValueKey(DevInstRegKey, &RegistryKey, 0, REG_DWORD, &NewValue, sizeof(NewValue));
}
if (NT_SUCCESS(Status) && DevMode->dmFields & DM_PELSHEIGHT)
{
RtlInitUnicodeString(&RegistryKey, L"DefaultSettings.YResolution");
NewValue = DevMode->dmPelsHeight;
Status = ZwSetValueKey(DevInstRegKey, &RegistryKey, 0, REG_DWORD, &NewValue, sizeof(NewValue));
}
ZwClose(DevInstRegKey);
if (NT_SUCCESS(Status))
Ret = DISP_CHANGE_RESTART;
else
Ret = DISP_CHANGE_FAILED;
break;
}
case CDS_TEST: /* Test if the mode could be set */
Ret = DISP_CHANGE_FAILED;