Reading Files from a USB camera
Hi All,
I have an application that detects when digital cameras are connected and
copies file from them. Currently it works with plug in play cameras that
use USB storage and I am now working on a Still Image version. I have the
Still Image handler code working and I can detect what USB port the camera
is on, but I am unable to read from that port. Basically what I want to do
is use windows.CreateFile passing the USB port in the format of //./Usbscan
and then query and read from this location. Below is a sample application
that uses CreateFile and then attempts to get pipe information from the file
handle using DeviceIOControl. The CreateFile call works without issue, but
I am getting an error, 87 - Parameter incorrect, on the DeviceIOControl
call. I have tried all combination of params I can think of to no avail.
Hopefully someone out there has done something similar... Here is the code:
unit Demo;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls;
{ start USBSCAN.h translation }
const
FILE_DEVICE_USB_SCAN = $8000;
IOCTL_INDEX = $0800;
METHOD_BUFFERED = 0;
FILE_ANY_ACCESS = 0;
MAX_NUM_PIPES = 8;
IOCTL_GET_PIPE_CONFIGURATION =
(FILE_DEVICE_USB_SCAN SHL 16) OR
(FILE_ANY_ACCESS SHL 14) OR
((IOCTL_INDEX + 10) SHL 2) or METHOD_BUFFERED;
//CTL_CODE(FILE_DEVICE_USB_SCAN, IOCTL_INDEX +
10,METHOD_BUFFERED,FILE_ANY_ACCESS);
type
_RAW_PIPE_TYPE = (
USBSCAN_PIPE_CONTROL,
USBSCAN_PIPE_ISOCHRONOUS,
USBSCAN_PIPE_BULK,
USBSCAN_PIPE_INTERRUPT );
_USBSCAN_PIPE_INFORMATION = record
MaximumPacketSize: Word;
EndpointAddress: UCHAR;
Interval: UCHAR;
PipeType: _RAW_PIPE_TYPE;
end {_USBSCAN_PIPE_INFORMATION};
USBSCAN_PIPE_INFORMATION = _USBSCAN_PIPE_INFORMATION;
PUSBSCAN_PIPE_INFORMATION = ^_USBSCAN_PIPE_INFORMATION;
_USBSCAN_PIPE_CONFIGURATION = record
NumberOfPipes: ULONG;
PipeInfo: Array[0..MAX_NUM_PIPES-1] of USBSCAN_PIPE_INFORMATION;
end {_USBSCAN_PIPE_CONFIGURATION};
USBSCAN_PIPE_CONFIGURATION = _USBSCAN_PIPE_CONFIGURATION;
PUSBSCAN_PIPE_CONFIGURATION = ^_USBSCAN_PIPE_CONFIGURATION;
{ end USBSCAN.h translation }
type
TForm1 = class(TForm)
Button1: TButton;
Memo1: TMemo;
Edit1: TEdit;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
var
hres: HRESULT;
srcHandle: THandle;
usbScanPipeInfo : USBSCAN_PIPE_CONFIGURATION;
overlapped : TOverlapped;
bytesReturned: DWORD;
b : boolean;
pt : _RAW_PIPE_TYPE;
begin
memo1.lines.clear();
memo1.lines.Add(format('USBSCAN_PIPE_CONFIGURATION
size:%s',[inttostr(sizeof(USBSCAN_PIPE_CONFIGURATION))]));
memo1.lines.Add(format('USBSCAN_PIPE_INFORMATION
size:%s',[inttostr(sizeof(USBSCAN_PIPE_INFORMATION))]));
// Initialize Overlapped structure
FillChar(overlapped, SizeOf(overlapped), #0);
overlapped.hEvent := CreateEvent(nil, True, False, nil);
srcHandle := CreateFile(
PChar(edit1.text), // format = //./Usbscanx
GENERIC_READ,
FILE_SHARE_READ,
nil,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL {OR FILE_FLAG_OVERLAPPED},
0
);
memo1.lines.Add(format('CreateFile LastError
size:%s',[inttostr(getlasterror ())]));
b := DeviceIoControl(
srcHandle,
DWORD(IOCTL_GET_PIPE_CONFIGURATION),
nil,
0,
@usbScanPipeInfo,
sizeof(USBSCAN_PIPE_CONFIGURATION),
bytesReturned,
//@overlapped // if FLAG FILE_FLAG_OVERLAPPED set in CreateFile
nil
);
memo1.lines.Add(format('DeviceIoControl LastError
size:%s',[inttostr(getlasterror ())]));
CloseHandle(srcHandle);
SetEvent(overlapped.hEvent);
CloseHandle(overlapped.hEvent);
end;
end.
|
0 |
|
Laszlo
8/20/2008 5:22:15 PM
embarcadero.delphi.nativeapi
1236 articles. 
1 followers.
0 Replies
1193 Views
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I have developed an app with sql server express 2005 and IIS and when I try to run it on another computer I get the following error message: ASPNETDB.MDF' cannot be upgraded because it is read-only or has read-only files. Make the database or files writeable, and rerun recovery.Cannot open user default database. Login failed.Login failed for user 'IBM\ASPNET'. Help would be much appreciated. Thanks Darren ACLs on the folders, permissions, check to see if SQL Express is installed, etc. JeffPlease: Don't forget to click "Mark as Answer" on the post that helped you. That ...
Database 'C:\INETPUB\WWWROOT\HOURSREPORTING\APP_DATA\ASPNETDB.MDF' cannot be upgraded because it is read-only or has read-only files. Make the database or files writeable, and rerun recovery.
I have a website that runs on this computer through IIS. It was working fine until I went into it and added a textbox. Now it gives me this: Server Error in '/' Application. Database 'C:\INETPUB\WWWROOT\HOURSREPORTING\APP_DATA\ASPNETDB.MDF' cannot be upgraded because it is read-only or has read-only files. Make the database or files writeable, and rerun recovery.Cannot open user default database. Login failed.Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Database 'C:\INETPUB\WWWROOT\HOURSREPORTING\APP_DATA\ASPNETDB.MDF' cannot be upgraded because it is read-only or has read-only files. Make the database or files writeable, and rerun recovery.Cannot open user default database. Login failed.Login failed for user 'NT AUTHORITY\NETWORK SERVICE'.Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [SqlException (0x80131904): Database 'C:\INETPUB\WWWROOT\HOURSREPORTING\APP_DATA\ASPNETDB.MDF' cannot be upgraded because it is read-only or has read-only files. Make the database or...
reading we.config file as XML file
Hi, I need to read web.config file of another application. I think it can be done by reading config file as xml file. How can i do this? If it possible, give me some sample code. Is there any other way to read it? Thanks in advance. /Mamun Please refer below code snippetSuppose below is ur web.config file1 <configuration> 2 <appSettings> 3 <add key="Login" value="admin"/> 4 <add key="Password" value="admin123"/> 5 </appSettings> 6 <connectionStrings> 7 <...
Problem reading some fileds in xml file
It's part of xml file i'm gathering info ..... <ThirdPartyProductInfo> - <ThirdPartyProductDetails> <OfferingType>Used</OfferingType> <SellerId>A16MZ6IWWRWUP5</SellerId> <SellerNickname /> <ExchangeId>Y11M3385853M6777809</ExchangeId> <OfferingPrice>$169.99</OfferingPrice> <Condition>new</Condition> <ExchangeAvailability>Usually ships in 4-5 business days</ExchangeAvailability> <SellerCountry>NA</SellerCountry> <SellerState>NA&l...
File Read and File Delete. Concurrency
Keeping image files and their thumbnail image files in a directory and using a custom handler to show the miniatures (and create cache thumbnails mentioned before) I sometimes have a situation where a user downloads a file (the handler is being used) and admin wanting to delete the file in the same time. That creates a situation when file cannot be deleted due to access deny. Ideas how to let admin delete the file anyway? Best regards,Jarosław Jaskułowski...
How to read file size of an existing file?
I was wondering if there was a way to read files byte size? I know there is System.IO namespace that interacts with the files/folders. Any help will be highly appreciated. Thanksnimish Hi nimish, try this FileInfo f = new FileInfo(@"c:\YourFileName.txt"); long fileSize = f.Length; Note: Don't forget to include System.IO namespace Thanks, Best Regards, Muhammad Akhtar SHiekhPlease remember to mark the appropriate replies as answer after your question is solved, thanks You can check the FileInfo class to work get properties of a certain fil...
Can't read an Excel 2010 32bit file from a Delphi 64bit program
Hello, I have a 64bit Delphi program that is trying to read an Excel spreadsheet using ADO. The platform is Windows 7 64bit with Office 2010 32bit installed. So I have a 64bit program trying to read Excel using 32bit drivers. I think this is the core of the problem. When I change my target platform and compile the program as 32bit, the code reads the Excel file correctly. When it fails I get the message 'Provider cannot be found. It may not be properly installed. Here is my procedure to read the file. I appreciate any help. Thanks in advance, Hardee Mahoney Washington, DC ...
I'm looking TSdfDataSet for Delphi 2009 ( read Text file like dataset )
Hi I'm looking TSdfDataSet for Delphi 2009 With Delphi 2007 , work all fine , but in Delphi 2009 i see only first char in every fields Somebody have already update this src ? Important point of src : unit SdfData; //----------------------------------------------------------------------------- { Unit Name : SdfData Application : TSdfDataSet TFixedFormatDataSet Components Version : 2.04 Author : Orlando Arrocha email: oarrocha@hotmail.com Purpose : This components are designed to access directly text files as database tabl...
How disable save file popup error message: file "could not be saved, because the source file could not be read." ; jor
When I save web pages (complete, not merely html, in order to save images) to my disk, while offline, I get about 10 pop up messages saying it can't load .js & .php files. I have to close each one of those 10 windows individually - a big waste of human time. Firefox 3.6.10 on Ubuntu Linux 10.4 Is there a way to 1) disable those info messages so they don't pop up, or 2) have ff put all the messages into merely one window, so I only have to close one window per web page. Thanks. :) = Popup window error message: {filename path to folder on disk} "could not...
Web resources about - Reading Files from a USB camera - embarcadero.delphi.nativeapi
Reading education in the United States - Wikipedia, the free encyclopediaReading education is the process by which individuals are taught to derive meaning from text. Government-funded scientific research on reading ...
Still Surprised By Trump? Then You’re Not Reading Scott Adams
Trump is typically regarded as the least scientific candidate, but according to Scott Adams, he is the best at using the "science of persuasion." ...
Trump is typically regarded as the least scientific candidate, but according to Scott Adams, he is the best at using the "science of persuasion." ...
It’s time to check out the Philips Hue smartphone-controlled lights you keep reading about... shot. The Philips 456194 Hue White and Color Ambiance A19 Starter Kit is now available from Amazon for just under $194 shipped. Continue reading... ...
A Reading for the Pigou Club
On British Columbia's carbon tax .
On British Columbia's carbon tax .
Weekend Reading: Robert Waldmann: New Keynesian Orthodoxy and Hysteresis
**Weekend Reading: Robert Waldmann**: [New Keynesian Orthdoxy and Hysteresis](http://angrybearblog.com/2016/02/new-keynesian-orthdoxy-and-hysteresis.html): ...
**Weekend Reading: Robert Waldmann**: [New Keynesian Orthdoxy and Hysteresis](http://angrybearblog.com/2016/02/new-keynesian-orthdoxy-and-hysteresis.html): ...
Ted Cruz likes to twerk and eat hair in Bad Lip Reading videoThe US presidential race gets much more entertaining when Ted Cruz's comments are translated via YouTube series Bad Lip Reading. His new campaign ...
Bad Lip Reading Does Ted Cruz
I'm still laughing so hard at this. It had me in the first 30 seconds or so. Watch, laugh and share.
I'm still laughing so hard at this. It had me in the first 30 seconds or so. Watch, laugh and share.
Ted Cruz Tells Baby ‘You’re The Devil’ In Latest ‘Bad Lip Reading’
Ted Cruz Tells Baby ‘You’re The Devil’ In Latest ‘Bad Lip Reading’
Ted Cruz Tells Baby ‘You’re The Devil’ In Latest ‘Bad Lip Reading’
Recommended Reading: US Soccer uses VR to reveal new crestUS Soccer's Rebranding Gets an Assist From Virtual Reality Zach Schonbrun, New York Times When the time came to reveal its new crest, the US ...
Watch Jon Cryer and Wife Lisa Joyner's Emotional Reading on 'Long Island Medium'
The 'Long Island Medium' special, live, two-hour event airs Sunday, March 6 on TLC.
The 'Long Island Medium' special, live, two-hour event airs Sunday, March 6 on TLC.
Resources last updated: 3/8/2016 10:21:04 AM