capture magnetic stripe input invisibly
in [MFC]
|
From: magix on 18 May 2008 14:56 Hi, I'm using VC++. I need the application to be always waiting for input from magnetic stripe, capture the string, decode it, and populate into those Edit field (IDC_EDITx) I already have the interface ready, but how can i make the magnectic stripe input (i.e keyboard input) to be invisible, and capture it. ...decoding is done at the background. The magnetic stripe will in fact populate the string and will be displayed at the keyboard cursor, after stripe. So, I want to know how: - to capture the stripe input in invisible way, and put into a string buffer. after that I know how to decode it. Any help is appreciated. Thanks. Regards, Magix
From: Scott McPhillips [MVP] on 18 May 2008 16:02 "magix" <magix(a)asia.com> wrote in message news:48307bf0$1_1(a)news.tm.net.my... > Hi, > > I'm using VC++. > I need the application to be always waiting for input from magnetic > stripe, capture the string, decode it, and populate into those Edit field > (IDC_EDITx) > I already have the interface ready, but how can i make the magnectic > stripe input (i.e keyboard input) to be invisible, and capture it. > ...decoding is done at the background. The magnetic stripe will in fact > populate the string and will be displayed at the keyboard cursor, after > stripe. > > So, I want to know how: > - to capture the stripe input in invisible way, and put into a string > buffer. > > after that I know how to decode it. Do you mean that the magnetic stripe comes in to an edit control as keys? If so, you can make make the "keys" invisible by handling the WM_CHAR message in a class you derive from CEdit. Your message handler will get the keys, but if you don't call CEdit::OnChar in that handler the keys will not go to the control and will not appear,. To intercept these keys you subclass the edit control. That means you add a CEdit control member variable to the dialog. Then you derive a class from CEdit (say, CMyEdit) and change the control member variable to CMyEdit. Then add the WM_CHAR handler to CMyEdit. -- Scott McPhillips [VC++ MVP]
From: magix on 18 May 2008 16:36 "Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp> wrote in message news:%23GAjXISuIHA.748(a)TK2MSFTNGP05.phx.gbl... > > "magix" <magix(a)asia.com> wrote in message > news:48307bf0$1_1(a)news.tm.net.my... >> Hi, >> >> I'm using VC++. >> I need the application to be always waiting for input from magnetic >> stripe, capture the string, decode it, and populate into those Edit field >> (IDC_EDITx) >> I already have the interface ready, but how can i make the magnectic >> stripe input (i.e keyboard input) to be invisible, and capture it. >> ...decoding is done at the background. The magnetic stripe will in fact >> populate the string and will be displayed at the keyboard cursor, after >> stripe. >> >> So, I want to know how: >> - to capture the stripe input in invisible way, and put into a string >> buffer. >> >> after that I know how to decode it. > > > Do you mean that the magnetic stripe comes in to an edit control as keys? > > If so, you can make make the "keys" invisible by handling the WM_CHAR > message in a class you derive from CEdit. Your message handler will get > the keys, but if you don't call CEdit::OnChar in that handler the keys > will not go to the control and will not appear,. > > To intercept these keys you subclass the edit control. That means you add > a CEdit control member variable to the dialog. Then you derive a class > from CEdit (say, CMyEdit) and change the control member variable to > CMyEdit. Then add the WM_CHAR handler to CMyEdit. > > -- > Scott McPhillips [VC++ MVP] Dear Scott, Many thanks for your hints. The magnetic stripe will behave like a keyboard cursor. once stripe, the string containing the information in the card will display out at the current cursor in any edit box or notepad, etc I will try with your suggestions. If you have good example, it will be great. Thanks. Regards, Magix
From: magix on 19 May 2008 13:02 Dear Scott, Can you show me with example with some piece of code ? Appreciate it. Regards, Magix "Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp> wrote in message news:%23GAjXISuIHA.748(a)TK2MSFTNGP05.phx.gbl... > > "magix" <magix(a)asia.com> wrote in message > news:48307bf0$1_1(a)news.tm.net.my... >> Hi, >> >> I'm using VC++. >> I need the application to be always waiting for input from magnetic >> stripe, capture the string, decode it, and populate into those Edit field >> (IDC_EDITx) >> I already have the interface ready, but how can i make the magnectic >> stripe input (i.e keyboard input) to be invisible, and capture it. >> ...decoding is done at the background. The magnetic stripe will in fact >> populate the string and will be displayed at the keyboard cursor, after >> stripe. >> >> So, I want to know how: >> - to capture the stripe input in invisible way, and put into a string >> buffer. >> >> after that I know how to decode it. > > > Do you mean that the magnetic stripe comes in to an edit control as keys? > > If so, you can make make the "keys" invisible by handling the WM_CHAR > message in a class you derive from CEdit. Your message handler will get > the keys, but if you don't call CEdit::OnChar in that handler the keys > will not go to the control and will not appear,. > > To intercept these keys you subclass the edit control. That means you add > a CEdit control member variable to the dialog. Then you derive a class > from CEdit (say, CMyEdit) and change the control member variable to > CMyEdit. Then add the WM_CHAR handler to CMyEdit. > > -- > Scott McPhillips [VC++ MVP]
From: Scott McPhillips [MVP] on 19 May 2008 18:14 "magix" <magix(a)asia.com> wrote in message news:4831b2b8$1_1(a)news.tm.net.my... > Dear Scott, > > Can you show me with example with some piece of code ? > Appreciate it. I emailed you an example project. -- Scott McPhillips [VC++ MVP]
|
Pages: 1 Prev: Help: Floating Point PRoblem Next: db.ExecuteSQL( SqlString ) |