i have connected my wince device with pc.now from my code i am using following code to open COM1 port and write on it. but it is not opening.Why?
WCHAR* m_PortNam = L"COM1";
m_hCOM = CreateFile(m_PortName, // Specify port device: default "COM1"
GENERIC_WRITE, // Specify mode that open device.
0, // the devide isn't shared.
NULL, // the object gets a default security.
OPEN_EXISTING, // Specify which action to take on file.
0, // default.
NULL);
// default.
if(m_hCOM != INVALID_HANDLE_VALUE)
{
}
else
{
//always going here
}
In Windows CE, the port name must include the colon:
TCHAR *m_PortName = _T("COM1:");
Related
I'm writing a minifilter, which wants to notify the r3 application to popup a messagebox in some cases. I used fltsendmessage in minifilter and filtergetmessage in r3. In r3 application, I wrote like:
while (INVALID_HANDLE_VALUE == s_portWorker.m_clientPort)
{
hResult = FilterConnectCommunicationPort(SERVER_PORTNAME_POPUP, 0, NULL, 0, NULL, &s_portWorker.m_clientPort);
if (IS_ERROR(hResult)) {
Sleep(1000);
}
while (true)
{
ZeroMemory(&getStruct, sizeof(GET_STRUCT));
hResult = FilterGetMessage(s_portWorker.m_clientPort, (PFILTER_MESSAGE_HEADER)&getStruct, sizeof(GET_STRUCT), NULL);
}
}
It works fine. But when I stop my minifilter, calling FltCloseCommunicationPort() in driver unload. The port has been closed, but the connection is still in, my r3 process will blocks on FilterGetMessage and never return.
I want to stop waiting the messagew when port close, and try to reconnect to my minifilter. What should I do? Since that FilterGetMessage() routine doesn't support a timeout mechanism, Do I have to create a event to notify the r3 when stop the filter?
You can implement a timeout mechanism by using lpOverlapped parameter.
HANDLE hWait = CreateEvent(NULL, TRUE, FALSE, NULL);
OVERLAPPED op = {0};
op.hEvent = hWait;
HRESULT hResult = FilterGetMessage(s_portWorker.m_clientPort， (PFILTER_MESSAGE_HEADER)&getStruct, sizeof(GET_STRUCT), &op);
if (hResult == HRESULT_FROM_WIN32(ERROR_IO_PENDING))
{
HANDLE phHandles[2] = { hWait, g_hTerm };
WaitForMultipleObjects(2, phHandles, TIME_OUT_VALUE);
}
And you can stop listenning by calling SetEvent(g_hTerm);
I've been trying to modify outgoing DNS packets via the DATAGRAM_DATA layer in WFP, however i get blue screen errors when rewriting the destination ip in the outgoing packet. What am i doing wrong?
I admit i found the parameters for FwpsInjectTransportSendAsync a bit confusing, and was unsure exactly what to put in for the sendParams arg - though i think what i have looks right.
RtlIpv4StringToAddressExW(
L"1.1.1.1", // hard-coding the new (rewritten) dns server for now
FALSE,
&sin4.sin_addr,
&sin4.sin_port);
RtlIpv4StringToAddressExW(
L"8.8.8.8", // hard-coding the original dns server for now
FALSE,
&origSin4.sin_addr,
&origSin4.sin_port);
if ((Direction == FWP_DIRECTION_OUTBOUND) && (PacketInjectionState == FWPS_PACKET_NOT_INJECTED) && (RemotePort == 53) && (RemoteAddress == origSin4.sin_addr.S_un.S_addr))
{
UINT32 IpHeaderSize = inMetaValues->ipHeaderSize;
UINT32 TransportHeaderSize = inMetaValues->transportHeaderSize;
UINT64 endpointHandle = inMetaValues->transportEndpointHandle;
PNET_BUFFER NetBuffer = NET_BUFFER_LIST_FIRST_NB((PNET_BUFFER_LIST)layerData);
NdisRetreatNetBufferDataStart(NetBuffer, IpHeaderSize + TransportHeaderSize, 0, NULL);
PNET_BUFFER_LIST NetBufferList = NULL;
NTSTATUS Status = FwpsAllocateCloneNetBufferList(layerData, NULL, NULL, 0, &NetBufferList);
if (!NT_SUCCESS(Status))
{
return;
}
NdisAdvanceNetBufferDataStart(NetBuffer, IpHeaderSize + TransportHeaderSize, FALSE, NULL);
if (!NetBufferList)
{
return;
}
NetBuffer = NET_BUFFER_LIST_FIRST_NB(NetBufferList);
PIPV4_HEADER IpHeader = NdisGetDataBuffer(NetBuffer, sizeof(IPV4_HEADER), NULL, 1, 0);
// Rewriting the dest ip
IpHeader->DestinationAddress = sin4.sin_addr.S_un.S_addr;
// Updating the IP checksum
UpdateIpv4HeaderChecksum(IpHeader, sizeof(IPV4_HEADER));
// not 100% sure the sendParams argument is setup correctly, the docs are slightly unclear
FWPS_TRANSPORT_SEND_PARAMS sendParams = {
.remoteAddress = (UCHAR*)IpHeader->DestinationAddress,
.remoteScopeId = inMetaValues->remoteScopeId,
.controlData = inMetaValues->controlData,
.controlDataLength = inMetaValues->controlDataLength,
.headerIncludeHeader = inMetaValues->headerIncludeHeader,
.headerIncludeHeaderLength = inMetaValues->headerIncludeHeaderLength
};
Status = FwpsInjectTransportSendAsync(g_InjectionHandle, NULL, endpointHandle, 0, &sendParams, AF_INET, inMetaValues->compartmentId, NetBufferList, DriverDatagramDataInjectComplete, NULL);
if (!NT_SUCCESS(Status))
{
FwpsFreeCloneNetBufferList(NetBufferList, 0);
}
classifyOut->actionType = FWP_ACTION_BLOCK;
classifyOut->rights &= ~FWPS_RIGHT_ACTION_WRITE;
classifyOut->flags |= FWPS_CLASSIFY_OUT_FLAG_ABSORB;
}
Two things stand out to me, both in the sendParams.
First, remoteAddress is incorrect. It needs to a pointer to the address, so it should be (UCHAR*)&IpHeader->DestinationAddress.
Second, FwpsInjectTransportSendAsync() is asynchronous so any parameters you pass to it need to stay valid until it completes which may be after your calling function returns. Typically you allocate some context structure that contains sendParams and deep copies of relevant members (remoteAddress and controlData). You pass this as the context to the completion routine where you free it.
I have a question about the KMDF Ramdisk sample of Microsoft.
How do create more than one ramdisk device? How will the PnP manager know to call EvtDeviceAdd and can I control how many times it is called?
WdfDeviceCreate() is used to create ramdisk device in RamDiskEvtDeviceAdd(), but I can not install more than one instance of this ramdisk driver.
NTSTATUS
RamDiskEvtDeviceAdd(
IN WDFDRIVER Driver,
IN PWDFDEVICE_INIT DeviceInit
) {
WDF_OBJECT_ATTRIBUTES deviceAttributes;
NTSTATUS status;
WDFDEVICE device;
WDF_OBJECT_ATTRIBUTES queueAttributes;
WDF_IO_QUEUE_CONFIG ioQueueConfig;
PDEVICE_EXTENSION pDeviceExtension;
PQUEUE_EXTENSION pQueueContext = NULL;
WDFQUEUE queue;
DECLARE_CONST_UNICODE_STRING(ntDeviceName, NT_DEVICE_NAME);
DECLARE_CONST_UNICODE_STRING(MY_SDDL_STRING, L"D:P(A;;GA;;;SY)(A;;GA;;;BA)(A;;GA;;;WD)(A;;GA;;;RC)");
PAGED_CODE();
UNREFERENCED_PARAMETER(Driver);
// Set name
status = WdfDeviceInitAssignName(DeviceInit, &ntDeviceName);
if (!NT_SUCCESS(status)) {
return status;
}
// Set permission
status = WdfDeviceInitAssignSDDLString(DeviceInit, &MY_SDDL_STRING);
if (!NT_SUCCESS(status)) {
return status;
}
WdfDeviceInitSetDeviceType(DeviceInit, FILE_DEVICE_DISK);
WdfDeviceInitSetIoType(DeviceInit, WdfDeviceIoDirect);
WdfDeviceInitSetExclusive(DeviceInit, FALSE);
WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&deviceAttributes, DEVICE_EXTENSION);
deviceAttributes.EvtCleanupCallback = RamDiskEvtDeviceContextCleanup;
status = WdfDeviceCreate(&DeviceInit, &deviceAttributes, &device);
if (!NT_SUCCESS(status)) {
return status;
}
pDeviceExtension = DeviceGetExtension(device);
WDF_IO_QUEUE_CONFIG_INIT_DEFAULT_QUEUE (
&ioQueueConfig,
WdfIoQueueDispatchSequential
);
ioQueueConfig.EvtIoDeviceControl = RamDiskEvtIoDeviceControl;
ioQueueConfig.EvtIoRead = RamDiskEvtIoRead;
ioQueueConfig.EvtIoWrite = RamDiskEvtIoWrite;
WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&queueAttributes, QUEUE_EXTENSION);
__analysis_assume(ioQueueConfig.EvtIoStop != 0);
status = WdfIoQueueCreate( device,
&ioQueueConfig,
&queueAttributes,
&queue );
__analysis_assume(ioQueueConfig.EvtIoStop == 0);
if (!NT_SUCCESS(status)) {
return status;
}
// Context is the Queue handle
pQueueContext = QueueGetExtension(queue);
// Set the context for our default queue as our device extension.
pQueueContext->DeviceExtension = pDeviceExtension;
// Now do any RAM-Disk specific initialization
pDeviceExtension->DiskRegInfo.DriveLetter.Buffer =
(PWSTR) &pDeviceExtension->DriveLetterBuffer;
pDeviceExtension->DiskRegInfo.DriveLetter.MaximumLength =
sizeof(pDeviceExtension->DriveLetterBuffer);
// Get the disk parameters from the registry
RamDiskQueryDiskRegParameters(
WdfDriverGetRegistryPath(WdfDeviceGetDriver(device)),
&pDeviceExtension->DiskRegInfo
);
// Allocate memory for the disk image.
pDeviceExtension->DiskImage = ExAllocatePoolWithTag(
NonPagedPool,
pDeviceExtension->DiskRegInfo.DiskSize,
RAMDISK_TAG
);
if (pDeviceExtension->DiskImage) {
UNICODE_STRING deviceName;
UNICODE_STRING win32Name;
RamDiskFormatDisk(pDeviceExtension);
status = STATUS_SUCCESS;
// Now try to create a symbolic link for the drive letter.
RtlInitUnicodeString(&win32Name, DOS_DEVICE_NAME);
RtlInitUnicodeString(&deviceName, NT_DEVICE_NAME);
pDeviceExtension->SymbolicLink.Buffer = (PWSTR)
&pDeviceExtension->DosDeviceNameBuffer;
pDeviceExtension->SymbolicLink.MaximumLength =
sizeof(pDeviceExtension->DosDeviceNameBuffer);
pDeviceExtension->SymbolicLink.Length = win32Name.Length;
RtlCopyUnicodeString(&pDeviceExtension->SymbolicLink, &win32Name);
RtlAppendUnicodeStringToString(&pDeviceExtension->SymbolicLink,
&pDeviceExtension->DiskRegInfo.DriveLetter);
status = WdfDeviceCreateSymbolicLink(device,
&pDeviceExtension->SymbolicLink);
}
return status;
Please help me! Thanks
I understand this is an old post, but since there are no useful answers, I thought I might add my thoughts.
EvtDeviceAdd is called by the KMDF framework when a device matches a hardware ID that your INF supports. (https://msdn.microsoft.com/en-us/library/windows/hardware/ff541693%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396).
According to the VirtualVolume documentation (https://code.msdn.microsoft.com/windowshardware/VirtualVolume-83334efd), the only way to create a device is to call devcon install virtvol.inf virtvol.
You can make multiple RAMDisks by calling devcon install multiple times.
My task is to print labels via a thermal printer. To this purpose a string of tspl(programming language that the printer understands) commands is generated and sent to the printer. The latter is done in C# with the following method taken from the microsoft example "How to send raw data to a printer by using Visual C# .NET"
public static bool SendBytesToPrinter(string szPrinterName, IntPtr pBytes, Int32 dwCount)
{
Int32 dwError = 0, dwWritten = 0;
IntPtr hPrinter = new IntPtr(0);
DOCINFOA di = new DOCINFOA();
bool bSuccess = false; // Assume failure unless you specifically succeed.
di.pDocName = "My C#.NET RAW Document";
di.pDataType = "RAW";
// Open the printer.
if (OpenPrinter(szPrinterName.Normalize(), out hPrinter, IntPtr.Zero))
{
// Start a document.
if (StartDocPrinter(hPrinter, 1, di))
{
// Start a page.
if (StartPagePrinter(hPrinter))
{
// Write your bytes.
bSuccess = WritePrinter(hPrinter, pBytes, dwCount, out dwWritten);
EndPagePrinter(hPrinter);
}
EndDocPrinter(hPrinter);
}
ClosePrinter(hPrinter);
}
// If you did not succeed, GetLastError may give more information
// about why not.
if (bSuccess == false)
{
dwError = Marshal.GetLastWin32Error();
MessageBox.Show("Error " + dwError);
}
return bSuccess;
}
The actual printer is selected in a PrintDialog
private void button2_Click(object sender, EventArgs e)
{
string s = "CLS\nPRINT 1\n"; // device-dependent string, need a FormFeed?
// Allow the user to select a printer.
PrintDialog pd = new PrintDialog();
pd.PrinterSettings = new PrinterSettings();
if (DialogResult.OK == pd.ShowDialog(this))
{
// Send a printer-specific to the printer.
RawPrinterHelper.SendStringToPrinter(pd.PrinterSettings.PrinterName, s);
}
}
In my working environment everything works fine. The environment is a LAN consisting of 3 computers and 1 shared thermal printer:
PC_with_printer - it runs on Windows 7 and has the printer connected to it via USB
PC_aware - it runs on Win 8 and knows about the shared printer
PC_unaware - it runs on WinXP and doens't have the shared printer installed
From PC_aware I connect to PC_unaware via rdp and the printer appears in the list of printers as redirected. Then I run my application , choose the redirected printer and get my empty label printed. So far so good.
Problems begin when I replace PC_unaware with another computer. It runs on Windows Server 2008 R2 and is not in our LAN. Let's call it SERVER. So I carry out the same experiment:
From PC_aware I connect to SERVER via rdp using its public ip address
My thermal printer appears in "Printers and Devices" as "TSC_TDP-244 (redirected 20)"
I go to the printer's properties and click Print Test Page, and it gets printed
I run my app and the printer doesn't print anything.
I have checked return values of all winapi functions that are used in SendBytesToPrinter method (OpenPrinter,StartDocPrinter, StartPagePrinter, WritePrinter,EndPagePrinter,EndDocPrinter, ClosePrinter), and none of them indicates an error. Any idea why it happens and how it may be fixed?
PRINTER_DEFAULTS pd;
pd.DesiredAccess = PRINTER_ACCESS_USE;
pd.pDatatype = NULL;
pd.pDevMode = NULL;
if (!OpenPrinter(szPrinterName, &hPrinter, &pd))
return false;
I am trying to understand better how Windows sessions (TS sessions and log on sessions) works (currently in XP), so maybe my whole question or what I am trying to do is impossible.
I am running a Windows service (in XP), which runs in session 0, and I am trying to get the username attached to this session using WTSQueryUserToken().
Now, in session 0 there are several usernames: SYSTEM, theuser (logged on user),NETWORK SERVICE, LOCAL SERVICE.
When I use WTSQueryUserToken() I get "theuser" (which is the Active session), but I am trying to get the username of my service (which is SYSTEM).
Is that possible or did I simply get it all wrong?
I use the following code to get user token for my process
HANDLE GetProcessOwnerToken(DWORD pid)
{
if (!pid) return NULL;
HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pid);
if (!hProcess) return NULL;
HANDLE hToken = NULL;
if(OpenProcessToken(hProcess, MAXIMUM_ALLOWED, &hToken))
{
HANDLE result = INVALID_HANDLE_VALUE;
if(DuplicateTokenEx(hToken, TOKEN_ASSIGN_PRIMARY | TOKEN_ALL_ACCESS, NULL, SecurityImpersonation, TokenPrimary, &result))
{
if(result != INVALID_HANDLE_VALUE)
{
CloseHandle(hToken);
CloseHandle(hProcess);
return result;
}
}
CloseHandle(hToken);
}
CloseHandle(hProcess);
return NULL;
}
I have no idea if it works for services as well, I think it should.