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I have some code reading and writing to a USB Windows CE device (it's actually using the ActiveSync driver). On Windows XP I use CreateFile to open the port and ReadFile and WriteFile to do IO - this works fine. On Vista I can open the port but ReadFile and WriteFile always return this invalid function error (error code 1). Any ideas?
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Hi,
Vista won't let you:
- write files in certain locations, e.g. C:\Program Files;
- access the device as a whole, e.g. when trying to get the hardware serial number;
unless you are running with administrator rights.
Easiest work-around normally is choose a different folder, one that is not special to Windows.
Luc Pattyn [Forum Guidelines] [My Articles]
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This "answer" has no relevance to my question. I am writing to a USB device not a file.
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Hi Keith,
sorry I misunderstood what your target device was.
I'll try once more: maybe this[^] puts your mind at ease.
Luc Pattyn [Forum Guidelines] [My Articles]
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets
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I'm wondering how you're "opening" the USB "port"?? USB is not a port, but a bus. You can't open the bus like a serial port or something and read/write to it. You have to open the device that's connected to that bus.
So, how are you opening that device?
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Yes, I'm not actually opening "usb". I look up the name of the device port using SetupDiEnumDeviceInterfaces and SetupDiGetDeviceInterfaceDetail; this returns a port name like "\\?\usb#vid_03f0&pid_1016#5&12334f9d&0&2#{25dbce51-6c8f-4a72-8a6d-b54c2b4fc835}" and I use this in CreateFile to get a handle to the device. I can then use this in ReadFile and WriteFile - or I can in XP but not in Vista. Vista is happy to open the port but ReadFile/WriteFile just return error 1.
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Error 1 is "INVALID_FUNCTION". Security has changed dramatically in Vista so the first thing I'd try is running the app as an admin and see what happens. If it works, you have to see if including a manifest to tell Vista to run the app as an admin is going to work for you. If not, then you have to find another method of talking to the device.
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I do all my development under admin authority, so it's not that.
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The only thing I could find on this error was that ReadFile had to use a buffer with a size evenly divisible by 64. If this doesn't fix the problem, I think you're going to be stuck trying to find another method of talking to the device, or at least using a different file name.
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Sanity check the app you're using was explicitly started with "run as admin"?
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots.
-- Robert Royall
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No. My userid has full administrator authority.
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Yeah, but it's not running like that all the time. An admin user is run as a normal user until the admin rights are required. If the app you launched doesn't have a manifest saying that it need elevated priv's, then it runs as a normal user, even under an admin account.
Under XP, admin account has admin priv's all the time. Under Vista, they only have admin priv's when needed, on demand. But, this "on demand" only kicks in if the app running requests admin priv's. That's where the application manifest comes in.
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Ok, I've run the app with the "run as admin" function; didn't make any difference.
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Hi,
run as administrator for device access[^]
BTW it is strange your CreateFile succeeds, and Read/WriteFile don't.
Luc Pattyn [Forum Guidelines] [My Articles]
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets
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am in need of some learning on how to interface finger-print with a security door.
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Well, you need to get with the manufacturer of the door devices and see if you can get some kind of specification as to what to do to get the door to unlock. Then, you have to get with the manufacturer of the finger print scanner to see what you have to do to create a database of fingerprints and how to retrieve the prints from the scanner and loko them up in the database. Then you send an appropriate signal to the door hardware to "pop the lock".
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Hi.
I'm searching for a relatively easy way to get a Filter Driver working. I need it for some sort of data consistency tool, that I'm planning to write.
I've searched the net for a library simlar to the IFS Kit provided by Microsoft for their Windows DDK. Is there something like this for MinGW?
But the best solution for me would be a complete component that I can use quickly without writing the complete driver. I need no special functionalty. The standard (create/read/write...) methods plus the output of the data read/written are fine for me.
I found some non-free SDKs, but nothing that is opensource.
Does somebody know souch components?
Thanks,
Martin.
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Hi,
I have desktop IBM NetVista and BIOS is in german language,I need to boot it from CDROM but i can't find option in BIOS to boot because language is german.
Is possible to update BIOS language in english or how can I make it to boot from CDROM?
Regards.
I Love T-SQL
"Don't torture yourself,let the life to do it for you."
If my post helps you kindly save my time by voting my post.
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Unless you see a likely item in the bios to change (look for an option the says Deutsch) you'll need to find an English language BIOS from the manufacturer and follow their flash procedure.
Edit: You could also try feeding all the BIOS text into a translator until you find the option that way...
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots.
-- Robert Royall
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Is anyone else having problems with Vista printer drivers and there .Net application? My program hangs when the print preview control is initialised. If I try to catch the problem in a catch{} try block it often fails with a memory error at the next line of code.
I am assuming the users buy a new PC, Vista installed, and then hook up to there trusty network or locally attached 5 year old printers. I can't reproduce these problems at home so I am a bit lost.
I found this link which explains where some of the problems may start:
[^]
Thanks
Stuart
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new PC, Vista installed, and then hook up to there trusty network or locally attached 5 year old printers. you 2gb ram use
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Yes the PC has3.5 gb of ram. The printer causing problems is an HP and the drivers are uptodate.
OS Version: 6.0.6001.65536 Service Pack 1 Workstation x86
.NET Framework version: 2.0.50727.3074 x86
Processor: 2x "AMD Athlon(tm) 64 X2 Dual Core Processor 3800+" @ ~2004MHz (DEP, SSE, SSE2, SSE3)
Physical memory: 3453 MB
I've asked the user to try Paint.Net
Stuart
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Write a simple program that doesn't do anything but display the print preview form, and send it to the user. If THAT program crashes, it's on the user's end. If it doesn't, you've got faulty code that is probably somehow connected to what you're printing. I assume you know that the same code that prints is also the code used to provide the previewed printout.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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Thanks John. Thats a good idea. One user has installed pdfcreator and now can print to pdf and then on to their printer but still can't print directly from my app. I have a smaller app that use an RTF control that supports printing so I'll send them a copy for testing.
The error messages I get when my program crashes point to memory corruption by the driver. Here is one example:
Exception details:
System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at System.Drawing.SafeNativeMethods.PrintDlg(PRINTDLGX86 lppd)
at System.Drawing.Printing.PrinterSettings.GetOutputPort()
at System.Drawing.Printing.PrinterSettings.FastDeviceCapabilities(Int16 capability, IntPtr pointerToBuffer, Int32 defaultValue, String printerName)
at System.Drawing.Printing.PrinterSettings.Get_PaperSizes()
at System.Drawing.Printing.PageSettings.PaperSizeFromMode(DEVMODE mode)
at System.Drawing.Printing.PageSettings.GetPaperSize(IntPtr modeHandle)
at System.Drawing.Printing.PageSettings.GetBounds(IntPtr modeHandle)
at System.Drawing.Printing.PrintController.CreatePrintPageEvent(PageSettings pageSettings)
at System.Drawing.Printing.PrintController.PrintLoop(PrintDocument document)
at System.Drawing.Printing.PrintController.Print(PrintDocument document)
at System.Drawing.Printing.PrintDocument.Print()
at System.Windows.Forms.PrintPreviewControl.ComputePreview()
Here is what happened when I tried to cath the error in a Try Catch block. In the Catch I am trying to display the exception contents in a MessageBox )
Exception details:
System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at System.RuntimeTypeHandle.ConstructName(Boolean nameSpace, Boolean fullInst, Boolean assembly)
at System.RuntimeType.RuntimeTypeCache.ConstructName(String& name, Boolean nameSpace, Boolean fullinst, Boolean assembly)
at System.RuntimeType.get_Name()
at System.Diagnostics.StackTrace.ToString(TraceFormat traceFormat)
at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)
at System.Exception.get_StackTrace()
at System.Exception.ToString()
at DrawTools.Startup.Main(String[] args)
Thanks
Stuart
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Make sure their OS and their .Net framework is fully patched up. Oh yeah, and make sure they're using the latest OS-compatible video drivers.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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