C#

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accessing HID + c# g00fyman8-Jun-05 23:54 g00fyman 8-Jun-05 23:54  hello to everyone, i need some idea of how to access a USB HID magnetic card reader in C#. i have googled quickly and search these articles but have not found anything revealing. does anyone know if any quick tutorials to acheive this ? kind regards, g00fy Re: accessing HID + c# Dave Kreskowiak9-Jun-05 6:45 Dave Kreskowiak 9-Jun-05 6:45  See if the manufacturer of the device has an SDK (Software development kit) for it. Without an SDK or reference for the device drivers for the device, you're out of luck. There is no such thing as "just accessing USB." Every device is different and requires its own driver. USB is NOT a generic access method for devices attached to it. It's an expansion bus, just like PCI, and just like PCI, each device must have it's own driver in order to communicate with it. RageInTheMachine9532 "...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome Re: accessing HID + c# g00fyman9-Jun-05 18:54 g00fyman 9-Jun-05 18:54  well i have the option to purchase RS232 interface rather than USB, would this be better for me ? or is it much the same if i have SDK for USB ? if i can get the driver, is it then a matter of listening to a certain port ? or is it more low level requiring hardware instructions ? or is it driver dependant? sorry alot of question kind regards g00fy Re: accessing HID + c# Dave Kreskowiak10-Jun-05 1:29 Dave Kreskowiak 10-Jun-05 1:29  g00fyman wrote: well i have the option to purchase RS232 interface rather than USB, would this be better for me ? Your still going to need to have the docs on the device so you know what commands the device accepts, how to format them, how to parse any data that comes back, ... g00fyman wrote: if i can get the driver, is it then a matter of listening to a certain port ? If you don't have the driver, the device won't work! g00fyman wrote: is it more low level requiring hardware instructions ? or is it driver dependant? It's very hardware dependant. No matter what, you'll need some kind of documentation describing the command interface of the device. Without it, it'll be like your speaking Chinese in Oklahoma, if you even get to Oklahoma. RageInTheMachine9532 "...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome Re: accessing HID + c# g00fyman10-Jun-05 1:35 g00fyman 10-Jun-05 1:35  thank you for all your help regards g00fy C# Sql INSERT statment Rinventive8-Jun-05 23:33 Rinventive 8-Jun-05 23:33  I am trying to insert data into a Access db. I am able to connect to the db fine. I get an error in the catch telling me I have a problem with my sql statment. This is my sql statment. (I have checked the spelling of all variables and field, table names etc...) All information is comming from textboxes --except newNum -- uses a method to find the next avalible number (worked like this on a different db) string sqlString = "INSERT INTO Cafe (CustomerNumber, FirstName, LastName, Address, City, Province, PostalCode, PhoneNumber, UserName, Password, TimePurchased ) VALUES (" + newNum.ToString() + ",'" + FirstNameTxt.Text + "','" + LastNameTxt.Text + "','" + AddressTxt.Text + "','" + CityTxt.Text + "','" + ProvinceTxt.Text + "','" + PostalCodeTxt.Text.ToUpper() + "','" + PhoneNumTxt.Text + "','" + UserNameTxt.Text + "','" + PasswordTxt.Text + "'," + TimePurchaseTxt.Text.ToString() + ")"; the Access db is called Assignment3 the table is called Cafe CustomerNumber (autoNumber) PK FirstName (Text) LastName (Text) Address (Text) City (Text) Province (Text) PostalCode (Text) PhoneNumber (Number) UserName (Text) Password (Text) TimePurchased (Number) I am new to sql and would really like some help Thanks Re: C# Sql INSERT statment codeprojectin8-Jun-05 23:47 codeprojectin 8-Jun-05 23:47  Remove the autonumber, and it would be better controlled by Access itself instead of your function. Include the error message in the email. Also, provide the value of sqlString at runtime which would be easy for us to look into. Re: C# Sql INSERT statment Rinventive9-Jun-05 0:25 Rinventive 9-Jun-05 0:25  The autonumber is controled by Access. each feild does have a value when I debug. Re: C# Sql INSERT statment Colin Angus Mackay8-Jun-05 23:56 Colin Angus Mackay 8-Jun-05 23:56  You cannot insert into an AutoNumber column. Either make the column a regular number column, or do not include the column in the INSERT statement (allowing the database to assign it the next available number). Also, your code is extremely susceptable to a SQL Injection Attack. You should read SQL Injection Attackes and Tips on How To Prevent Them[^] My: Blog | Photos WDevs.com - Open Source Code Hosting, Blogs, FTP, Mail and More Re: C# Sql INSERT statment Rinventive9-Jun-05 0:30 Rinventive 9-Jun-05 0:30  I still have a problem....this is what I did to remove the CustomerNum string sqlString = "INSERT INTO Cafe ( FirstName, LastName, Address, City, Province, PostalCode, PhoneNumber, UserName, Password, TimePurchased ) VALUES (" + FirstNameTxt.Text + ",'" + LastNameTxt.Text + "','" + AddressTxt.Text + "','" + CityTxt.Text + "','" + ProvinceTxt.Text + "','" + PostalCodeTxt.Text.ToUpper() + "','" + PhoneNumTxt.Text + "','" + UserNameTxt.Text + "','" + PasswordTxt.Text + "'," + TimePurchaseTxt.Text + ")"; Error -- Syntax error in INSERT INTO statment Thanks for your help!! Re: C# Sql INSERT statment Carsten Zeumer9-Jun-05 0:54 Carsten Zeumer 9-Jun-05 0:54  what does the sqlString look like if you dump it to the console? Since you do not quote you parameters it is possible that they contain quotes or commas... /cadi 24 hours is not enough Re: C# Sql INSERT statment Rinventive9-Jun-05 0:57 Rinventive 9-Jun-05 0:57  I'm not sure what you mean "dump it to the console" and none of the text input has anything other then letters and numbers. I'm new to this...Thanks Re: C# Sql INSERT statment Carsten Zeumer9-Jun-05 1:03 Carsten Zeumer 9-Jun-05 1:03  Somthing like System.Console.Out.WriteLine(sqlString); . Have yout tried to paste the result in any DB-Mamangent tool (if you use SQL Server try the Query Analyzer)? You'll probably get a more detailed error description.... /cadi 24 hours is not enough Re: C# Sql INSERT statment V.9-Jun-05 1:02 V. 9-Jun-05 1:02  -> "... VALUES ('" not "... VALUES (" some on "')" instead of ")" good luck. (PS: Debug the code, quickwatch the sqlString variable when fully loaded, copy the statement and execute it manually, then you'll know what went wrong or catch the execution and dump the error message.) No hurries, no worries. Re: C# Sql INSERT statment Colin Angus Mackay9-Jun-05 1:06 Colin Angus Mackay 9-Jun-05 1:06  You don't put a apostrophes around the the first value like you have on the other values. By the way, this is extremely bad practice and leaves your code open to attack. You should read the article that I gave you a link to in order to find out how to prevent attacks on your code. To summaries the immediate situation, you should use a parameterised query rather than injecting the values directly into the SQL statement. My: Blog | Photos WDevs.com - Open Source Code Hosting, Blogs, FTP, Mail and More Re: C# Sql INSERT statment Rinventive9-Jun-05 1:13 Rinventive 9-Jun-05 1:13  I read the article, Thank you...after I get it working I will try to make it safer Re: C# Sql INSERT statment Dave Kreskowiak9-Jun-05 6:38 Dave Kreskowiak 9-Jun-05 6:38  The other point to that article is to make your code easier to debug and FAR less suseptible to your input ACCIDENTLY breaking your code. If the user happens to type an ' or " in those textboxes somewhere, it'll break your code when you try and insert that into the database. Parameterized queries remove that possiblity because the Parameter objects automatically escape these characters so they won't break your SQL code. SQL attacks, or failure exploits, are not all deliberate, most happen by pure accident. Learn to avoid situations where your code can break by accident now, before bad habits become your normal practice. RageInTheMachine9532 "...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome Re: C# Sql INSERT statment Rinventive9-Jun-05 1:28 Rinventive 9-Jun-05 1:28  I used the System.Console.Out.WriteLine(sqlString); so I could read what valuse are in the statment durning debug...I can't seem to see anything wrong. Just inexperienced and need practice. Re: C# Sql INSERT statment Colin Angus Mackay9-Jun-05 1:31 Colin Angus Mackay 9-Jun-05 1:31  Rinventive wrote: I can't seem to see anything wrong. Post the SQL Statement on the forum then we can have a look and see what is wrong. My: Blog | Photos WDevs.com - Open Source Code Hosting, Blogs, FTP, Mail and More Re: C# Sql INSERT statment Rinventive9-Jun-05 1:34 Rinventive 9-Jun-05 1:34  Here is the INSERT statment I started with, this is from a previous project and it works fine. string sqlString = "INSERT INTO Members (MemberNum, FirstName, LastName, Address, City, Province, PostalCode, Status, Balance ) VALUES (" + newNum.ToString() + ",'" + FirstName.Text + "','" + LastName.Text + "','" + Address.Text + "','" + City.Text + "','" + comboBox1.Text + "','" + PostalCode.Text.ToUpper() + "','" + GetMemberStatus() + "'," + BalanceOwing.Text + ")"; and the db information MemberNum (autonumber) LastName (text) FirstName (text) Address (text) City (text) Province (text) PostalCode (text) Status (text) Balance (number) Sorry to be so much trouble and thanks for your time Re: C# Sql INSERT statment Rinventive9-Jun-05 1:42 Rinventive 9-Jun-05 1:42  Here is my current statment string sqlString = "INSERT INTO Cafe (CustomerNumber, FirstName, LastName, Address, City, Province, PostalCode, PhoneNumber, UserName, Password, TimePurchased ) VALUES (" + newNum.ToString() + ",'" + FirstNameTxt.Text + "','" + LastNameTxt.Text + "','" + AddressTxt.Text + "','" + CityTxt.Text + "','" + ProvinceTxt.Text + "','" + PostalCodeTxt.Text.ToUpper() + "','" + PhoneNumTxt.Text + "','" + UserNameTxt.Text + "','" + PasswordTxt.Text + "'," + TimePurchaseTxt.Text + ")"; and my current db CustomerNumber (autonumber) FirstName (Text) //Bill LastName (Text) //Ray Address (Text) //anystreet City (Text) //Hometown Province (Text) //Ont PostalCode (Text) //N5BY4G PhoneNumber (Number) //123456 UserName (Text) //Rbill Password (Text) //whatever TimePurchased (Number) //1 I how\pe this helps Re: C# Sql INSERT statment Rinventive9-Jun-05 1:53 Rinventive 9-Jun-05 1:53  Here is the sql statment from System.Console.Out.WriteLine(sqlString); sql string = "INSERT INTO Cafe (CustomerNumber, FirstName, LastName, Address, City, Province, PostalCode, PhoneNumber, UserName, Password, TimePurchased) VALUES (2,'Bill','Ray','anystreet','Hometomwn','ont',N6BYK6','6727894','Rbill','123456',0)" Re: C# Sql INSERT statment vincent.reynolds9-Jun-05 5:50 vincent.reynolds 9-Jun-05 5:50  The value N6BYK6 is missing the first single quote. Risk of SQL injection attacks aside, it may make things a bit more readable to write a small function to quote text values. That way, instead of relying on the visually confusing "','", you could just say SingleQuote(firstName). Make sense? V ListView multiline items? george ivanov8-Jun-05 22:58 george ivanov 8-Jun-05 22:58  Is it possible the items in ListView control to be set as multiline, so the text to be displayed in two lines for one item? thanks. Re: ListView multiline items? Philip Price8-Jun-05 23:18 Philip Price 8-Jun-05 23:18  If \r\n doesnt work, then you'll have to inherit the control and handle the paint events.

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