|
Well, unfortunately for you, the commands, responses, and communication protocol between the different card readers are, more-than-likely, not the same. You're going to end up writing a seperate communication module for each card reader you have. The SDK for each of them is the only thing that's going to simplify this process.
|
|
|
|
|
Thank you for your response!
I was afraid , but not surpsised by your answer.
Since those devices don't support PS/SC, there is no universal way to achieve my goal.
However when i pass this hell, i'm going to write an article about contactless cards and contactless card readers i codeproject (actually ... as surprising as it sounds ... there is not even one GOOD article about that in the web - i've been researching like a whole week )
Thanks again for the information !
Best regards, Hristiyan ....
|
|
|
|
|
What I did, was that I had a Mifare and a 15693 contactless mix. The readers were made by entirely different companies. Each reader has its own dll and there is unmanaged code to and from the reader, so in C# you must use delegates for you methods.
You must also add the references (dlls to the project). Then you create a reader object for every kind of reader that you have dlls for.
I had a dll which was able to read and code to differentiate the various RFID technologies, and using that bit of code snippet, I was able to determine what dlls and reader objects to use.
The SDKs were fairly expensive, but I can give you a C++ code snippet on how to determine the various technologies: (you will notice that this can determine 1so15693, 14443A, 14443B, iso8000, felica
CIso_benchDlg::CIso_benchDlg(CWnd* pParent )
: CDialog(CIso_benchDlg::IDD, pParent)
{
m_tagid = _T("");
m_type = _T("");
m_iso15693 = FALSE;
m_iso14443A = FALSE;
m_iso14443B = FALSE;
m_iso18000 = FALSE;
m_felica = FALSE;
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CIso_benchDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
DDX_Control(pDX, IDC_DETECT, m_button);
DDX_Text(pDX, IDC_TAGID, m_tagid);
DDX_Text(pDX, IDC_TYPE, m_type);
DDX_Check(pDX, IDC_CHECK1, m_iso15693);
DDX_Check(pDX, IDC_CHECK2, m_iso14443A);
DDX_Check(pDX, IDC_CHECK3, m_iso14443B);
DDX_Check(pDX, IDC_CHECK4, m_iso18000);
DDX_Check(pDX, IDC_CHECK5, m_felica);
}
BEGIN_MESSAGE_MAP(CIso_benchDlg, CDialog)
ON_WM_TIMER()
ON_BN_CLICKED(IDC_DETECT, OnDetect)
END_MESSAGE_MAP()
BOOL CIso_benchDlg::OnInitDialog()
{
CDialog::OnInitDialog();
SetIcon(m_hIcon, TRUE);
SetIcon(m_hIcon, FALSE);
CenterWindow(GetDesktopWindow());
SetTimer(IDC_TIMER, 20, NULL);
UpdateData(FALSE);
return TRUE;
}
void CIso_benchDlg::OnTimer(UINT nIDEvent)
{
if (detect){
char tag_id[600];
tag_id[0]=0;
int temp=0;
int success=0;
m_iso15693=false;
m_iso14443A=false;
m_iso14443B=false;
m_iso18000=false;
m_felica=false;
C1_disable(); C1_enable();
if(success=get_14443A(&my_tag_14443A)) {
if(my_tag_14443A.type==MIFARE_CL) m_type="MiFare Classic";
else if(my_tag_14443A.type==MIFARE_UL) m_type="MiFare UltraLight";
else if(my_tag_14443A.type==MIFARE_DF) m_type="MiFare DESFire";
else m_type="14443A";
m_iso14443A=true;
C1_disable(); C1_enable();
}
if(temp) success=true;
if(temp=get_15693(&my_tag_15693,NULL)) {m_type="ISO 15693"; m_iso15693=true; C1_disable(); C1_enable();}
if(temp) success=true;
if(m_type!="ISO 15693" && (temp=get_18000(&my_tag_18000))) {m_type="ISO 18000"; m_iso18000=true; C1_disable(); C1_enable();}
if(temp) success=true;
if(temp=get_IC(&my_tag_IC, IC_15693, false, false)) {m_type="INSIDE"; m_iso15693=true; C1_disable(); C1_enable();}
if(temp) success=true;
if(temp=get_IC(&my_tag_IC, ISO_14443B3, false, false)) {m_type="INSIDE"; m_iso14443B=true; C1_disable(); C1_enable();}
if(temp) success=true;
if(temp=get_IC(&my_tag_IC, IC_14443B, false, false)) {m_type="INSIDE"; m_iso14443B=true; C1_disable(); C1_enable();}
if(temp) success=true;
if(temp=get_14443B(&my_tag_14443B)) {m_type="14443B"; m_iso14443B=true; C1_disable(); C1_enable();}
if(temp) success=true;
C1_disable(); C1_enable();
if(temp=get_14443B_SRI(&my_tag_14443B)) {m_type="14443B"; m_iso14443B=true; C1_disable(); C1_enable();}
if(temp) success=true;
C1_disable(); C1_enable();
if(temp=get_14443B_SR176(&my_tag_14443B)) {m_type="14443B"; m_iso14443B=true; C1_disable(); C1_enable();}
if(temp) success=true;
if(temp=get_FeliCa(&my_tag_FeliCa)) {m_type="FeliCa"; m_felica=true; C1_disable(); C1_enable();}
if(temp) success=true;
if (success){
success=0;
if(m_type=="ISO 15693") {
m_tagid="";
for(int i=0;i<my_tag_15693.id_length;i++) sprintf(tag_id,"%s%02X",tag_id,my_tag_15693.tag_id[i]);
m_tagid=tag_id;
}
else if(m_type=="MiFare Classic" || m_type=="MiFare UltraLight" || m_type=="MiFare DESFire" || m_type=="14443A") {
m_tagid="";
for(int i=0;i<7;i++) sprintf(tag_id,"%s%02X",tag_id,my_tag_14443A.tag_id[i]);
m_tagid=tag_id;
}
else if(m_type=="INSIDE") {
m_tagid="";
for(int i=0;i<8;i++) sprintf(tag_id,"%s%02X",tag_id,my_tag_IC.tag_id[i]);
m_tagid=tag_id;
}
else if(m_type=="ISO 18000") {
m_tagid="";
for(int i=0;i<my_tag_18000.data_length;i++) sprintf(tag_id,"%s%02X",tag_id,my_tag_18000.data[i]);
m_tagid=tag_id;
}
else if(m_type=="FeliCa") {
m_tagid="";
for(int i=0;i<my_tag_FeliCa.id_length;i++) sprintf(tag_id,"%s%02X",tag_id,my_tag_FeliCa.tag_id[i]);
m_tagid=tag_id;
}
else if(m_type=="14443B") {
m_tagid="";
for(int i=0;i<my_tag_14443B.id_length;i++) sprintf(tag_id,"%s%02X",tag_id,my_tag_14443B.tag_id[i]);
m_tagid=tag_id;
}
UpdateData(FALSE);
}
else{
if (m_tagid == "SEARCHING...") {
m_tagid = "SEARCHING.";
m_type = "SEARCHING.";
}
else {
m_tagid = "SEARCHING...";
m_type = "SEARCHING...";
}
UpdateData(FALSE);
}
}
CDialog::OnTimer(nIDEvent);
}
void CIso_benchDlg::OnDetect()
{
if(detect==FALSE) {
if(!C1_open_comm())
{
m_tagid = "Failed To Connect..";
m_type = "";
UpdateData(false);
C1_close_comm();
return;
}
if(!C1_enable())
{
m_tagid = "Failed To Enable..";
m_type = "";
UpdateData(false);
C1_close_comm();
return;
}
detect = TRUE;
m_button.SetWindowText(L"STOP DETECTION");
m_tagid = "";
m_type = "";
m_iso15693=false;
m_iso14443A=false;
m_iso14443B=false;
m_iso18000=false;
m_felica=false;
UpdateData(false);
} else {
C1_disable();
C1_close_comm();
detect = FALSE;
m_button.SetWindowText(L"DETECT!");
m_tagid = "";
m_type = "";
m_iso15693=false;
m_iso14443A=false;
m_iso14443B=false;
m_iso18000=false;
m_felica=false;
UpdateData(false);
}
}
Hope this helps.
|
|
|
|
|
we can populate Web Browser Control using DataFilePath and set the xml file path to DataFilePath property. i want to know how to populate web browser control with xml instead of using DataFilePath property of Web Browser Control. if possible the please let me know with sample code snippet.
tbhattacharjee
|
|
|
|
|
Save the XML to a temporary location and set DataFilePath accordingly?
Cheers,
Vıkram.
I've never ever worked anywhere where there has not been someone who given the choice I would not work with again. It's a job, you do your work, put up with the people you don't like, accept there are probably people there that don't like you a lot, and look forward to the weekends.
- Josh Gray.
|
|
|
|
|
Hi all,
I am trying to update a row through update query using SqlDataAdapter and DataSet. How can I know, this update query has made any changes in any row or not?
Thanks and Regards.
|
|
|
|
|
SqlDataAdapter.Update(DataSet) returns an System.Int32 value which gives the number of rows successfully updated from the DataSet.
"Don't worry if it doesn't work right. If everything did, you'd be out of a job." (Mosher's Law of Software Engineering)
|
|
|
|
|
Thanks for your reply but it can't work or I can not understand how to use this. Please describe with a little example. It fires an exception (Update unable to find TableMapping['Table'] or DataTable 'Table'.).
|
|
|
|
|
Use the Update overloaded one...i mean
SqlAdapter sa = new SqlAdapter();
int j = sa.Update(ds,"TableName");
"Don't worry if it doesn't work right. If everything did, you'd be out of a job." (Mosher's Law of Software Engineering)
|
|
|
|
|
Hi.............
Its Simple....
Just Keep the return value....
if it zero ... then No change....
else thats much change....
Just click If u wantto Know more...
http://msdn.microsoft.com/en-us/library/at8a576f.aspx[^]
|
|
|
|
|
Thanks for your reply but I can not understand how to use this. I am using given refrence link but it fires an exception (Update unable to find TableMapping['Table'] or DataTable 'Table'.).
|
|
|
|
|
It sounds like the basic issue is one of incompetence. Have you looked at the link provided and the code in the MSDN and compared it to your own ? If you want us to fix your code, have you considered posting it, so we can see where your error is ?
Christian Graus
Driven to the arms of OSX by Vista.
|
|
|
|
|
This is my code, where the problem occurs.
SqlDataAdapter da = new SqlDataAdapter("UPDATE CompanyInfo SET CompName='abc' where CompID='" + CompID.Text.Trim() + "'", con);
DataSet ds = new DataSet();
da.Fill(ds);
int gh = da.Update(ds, "CompanyInfo");
Exception fires on that code is ("Update unable to find TableMapping['CompanyInfo'] or DataTable 'CompanyInfo'.").
Please suggest for the wrong code.
Thanks and Regards
|
|
|
|
|
Hi every body,
Here i face a problem,the problem is i develop a pdf viewer,now i uninstall acrobat reader from my pc.
when i open a web page that contain pdf, open a new window with pdf viewer application. I want to open in IE like acrobat reader in IE.
Please help me.
using C#,.Net frame work 2.0
Sanjoy Bagchi
S/W Engineer
|
|
|
|
|
Sample.aspx:
Script File:
document.getElementById('ifr').src='LoadPdf.aspx';
In LoadPdf.aspx.CS .PageLoad Event U call This Method
private void WritePdf(byte[] pdfContent)
{
try
{
Response.ContentType = "application/pdf";
Response.OutputStream.Write(pdfContent, 0, (int)pdfContent.Length);
Response.Flush();
Response.Close();
}
catch (Exception ex)
{
throw ex;
}
}
|
|
|
|
|
Sir,in my pc there is no acrobat reader. there install my program to view pdf. i wrote your program but the error msg came like this
"
An invalid character was found in text content. Error processing resource 'http://localhost:1891/WebSite1/LoadPdf.aspx'. L...
%
"
please help me...
Sanjoy Bagchi
S/W Engineer
|
|
|
|
|
Hello everybody
I read the articles related to establish a connection between webcam and C#.
I have a webcam that has the following parameters
1-Image resolution RGB24 320*240....RGB24 1280*1024
I420 320*240...I420 640*480
I want to know how can i access these setting in my program.I want to change the mode and resolution
manually in my program
Regards
|
|
|
|
|
I had created a small application from the article http://www.codeproject.com/KB/cs/Attach_BHO_with_C_.aspx?fid=447248&df=90&mp p=25&noise=3&sort=Position&view=Quick&fr=51&select=2421069
But while the control is in "foreach loop", the CPU usage increases near about 80-90%. I just want to reduce that CPU usage.
The other thing is if I try to manipulate the web page text, the original text is visible to user for a fraction of second, and then the replaced text is visible to user. I don't want that original text is visible to user. I just want to replace the original text of a web page on the fly, for the I am using DWebBrowserEvents2_ProgressChangeEventHandler.
In the foreach loop I was identifying the tagname and replacing the innertext of tag element.
I want the replaced text should be seen directly by the user. But there was some delay in displaying the replaced text. i.e., initially for a fraction of second the original text is visible to user before the replaced text.
How can I avoid these two problems and the output should be...
1. User should be seen directly the replaced text but not the original text of a web page.
2. The CPU usage should be reduced which is caused because of "foreach loop".
As well as I was trying to identify individual tag elements using
http://www.codeproject.com/KB/shell/enum_selected_elements.aspx?
in which IMarkupServices interface is used. Here also same problem occurs. There is some delay in displaying the replaced text on the web page.
But the main problems are:
1. Delay in display of replaced text on a web page when it is visible to the user
2. The CPU usage is high which is caused because of "foreach loop".
I manipulated by innertext property of HTML tag elements in a foreach loop.
This has been developed from
http://www.codeproject.com/KB/cs/Attach_BHO_with_C_.aspx?fid=447248&df=90&mp p=25&noise=3&sort=Position&view=Quick&fr=51&select=2421069
How can i solve this.........
Any suggestions would have been appreciated.
I had spent so much time on these but are of no use.
I tried all these links but output is samea nd my problems can't be avoided.
http://social.msdn.microsoft.com/Forums/en-US/Offtopic/thread/1c835fad-66c0-46ba-b499-3ba7090bd660/
http://www.eggheadcafe.com/community/aspnet/2/10073309/how-to-reduce-cpu-usage-w.aspx
|
|
|
|
|
Hi ,
To reduce the CPU Usage in for each loop , you may use
Thread.Spleep(1) (you need to use System.Threading namespace), at the starting of you loop or at the end ,
Thread.Spleep(1) , will allow the CPU to serve the other threads.This should not impact your over all performance.
following is an example
A) Without Thread.Sleep(1) , the CPU usage is almost 70%
public Form1()
{
InitializeComponent();
while (true)
{
int i = 0;
i++;
i--;
}
}
B) If we use Thread.Sleep(1) , the CPU usage comes down to 2 %
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
while (true)
{
int i = 0;
i++;
i--;
Thread.Sleep(1);
}
}
}
Let me know if it was useful 
-Regards
Bharat Jain
bharat.jain.nagpur@gmail.com
|
|
|
|
|
Bharat Jain wrote: To reduce the CPU Usage in for each loop
That doesn't really reduce CPU usage - you're actually running more code in B) than in A). It only gives lower priority threads a chance to run.
|
|
|
|
|
Agreed but using the Thread.Sleep(1) , shares the CPU with the other process , in a for each loop the CPU Usage is high because it continuously doing the same work and consuming most of the CPU , making it hard for other application to run properly , hence if share the CPU with other applications it makes system run right .
-Regards
Bharat Jain
bharat.jain.nagpur@gmail.com
|
|
|
|
|
I already tried this, but the CPU usage is same...
|
|
|
|
|
Friends,
Quite frequently i need to throw exception from the code. But i don't want to write my custom exception class. Reason is that i don't have any dynamic data to be associated. In such situation, currently i am doing something like this:
skyColor = GetSkyColor();
if(skyColor == Blue)
{
Console.WriteLine("Its a day");
}
else if(skyColor == Black)
{
Console.WriteLine("It is night");
}
else
{
msg = String.Format("{0} is not a valid sky color", skyColor.ToString() );
throw new Exception(msg);
}
As you can see above i am throwing "Exception" which is considered as bad practice. The second option is that i use InvalidOperationException, but this exception is used when object state is not valid which is not the case here. Third option is that i write my own exception class InvalidSkyColorException. The case i described above is well qualified for custom exception as i can associate dynamic data SkyColor. But issue is that in most of the cases i don't even have dynamic data to associate. I just want to throw a string message. Now if i start writing my custom exception class for each of the situation, then there will be thousands of such classes in the project.
So what you guys suggest me in such cases. Shall i continue to throw generic "Exception" or use InvalidOperationException ? Or is there better solution ?
Imtiaz
|
|
|
|
|
|
KSuthar wrote: custom exception class using ApplicationException class[
Don't derive from ApplicationException class. Derive it from Exception instead. See the remarks section here[^].
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
