DevX.com Forums

simulating alt+2 (keypad) combination

kangekraam — Fri, 20 Nov 2009 20:58:16 GMT

I am trying to print the corresponding Unicode character for alt+2 to the Windows console window. (the console doesn't display the character, but should display ^B instead)
The following doesn't seem to work. Just prints "2".

Code:

keybd_event(VK_MENU,0 ,0 , 0); //Alt Press



Sleep(10);

keybd_event(VK_NUMPAD2,0, 0 , 0); // 2 Press



Sleep(10);

keybd_event(VK_NUMPAD2,0, KEYEVENTF_KEYUP,0); // 2 Release



Sleep(10);

keybd_event(VK_MENU,0,KEYEVENTF_KEYUP,0); // Alt Release



Sleep(10);

Neither does this work. Just prints "2", again.

Code:

        INPUT inputs = {0}; 

        inputs.type = INPUT_KEYBOARD; 



        KEYBDINPUT ki = {0}; 

        ki.wVk = VK_LMENU;



        inputs.ki = ki;

        SendInput(1, &inputs, sizeof(INPUT)); // Left alt



        ki.wVk = VK_NUMPAD2;

        inputs.ki = ki;

        SendInput(1, &inputs, sizeof(INPUT)); // Numpad 2



        ki.dwFlags = KEYEVENTF_KEYUP;



        ki.wVk = VK_NUMPAD2;

        inputs.ki = ki;

        SendInput(1, &inputs, sizeof(INPUT)); // Numpad 2



        ki.wVk = VK_LMENU;

        inputs.ki = ki;

        SendInput(1, &inputs, sizeof(INPUT)); // Left alt

VB 2005 Serial Ports

csparks — Fri, 20 Nov 2009 17:26:04 GMT

I am trying to write an application which among other things tests serial ports on a PCB. The PCB has a RS232 to RS422 two way conversion. Com1 and Com2 are my available RS232 ports and Com4 and Com5 are my available RS422 ports. I want to write to the RS232 port and verify that the correct data comes out the RS422 port. Then I want to write to the RS422 port and verify that the correct data comes out the RS232 port. I can�t seem to find the correct method to make that happen.

Hooking Create Process

evansjahja — Fri, 20 Nov 2009 15:22:34 GMT

Hi all, I want to ask, how do I hook CreateProcess? I want to write an antivirus program with Real Time Protector. Thanks.

I want to save my SMS to my computer , how can I do this?

janneluu — Fri, 20 Nov 2009 08:13:17 GMT

I want to save some of my short messages from my HTC touch to pc for later use but have no idea how to do it.

Carriage return

COMPCAD — Fri, 20 Nov 2009 00:09:01 GMT

In my last thread I wrote about having printing problems I feel that I have the printing taken care of. I feel that it is more a carriage return problem. In one of the feilds in my database the data is entered like this on a single line with spaces it would look like this:

KF 123 O456 1972

Where ever there is a space I would like a carriage return so that when it is printed it will look like this:

KF
123
O456
1972

Mystery "missing milliseconds": calling ActiveX from VB.Net sometimes takes 15ms !!??

rtvstoad — Thu, 19 Nov 2009 20:04:00 GMT

Posting here because I think it might be related to .Net runtime or Interop wrappers for unmanaged C++/MFC COM controls:

Background: I have an ActiveX/COM control written in C++/MFC which processes video (ie. 30 frames per second => about 33ms per frame processing budget) Various rendering aspects of the control can be modified using Set calls on the control, which clients can issue at any time.
It turns out that someone (Windows scheduler, .Net interop wrappers, MFC call dispatcher, memory allocator, garbage disposal ?) is quite frequently eating an incredibly long 15.625ms to make or return from the call into the control. Thats half my per-frame budget eaten by some gremlins in the runtime !

The control itself is - for historical reasons - written in C++/MFC. The problem happens when the control is called from C# as well as VB.Net. It happens on very different hardware (an HP Pavilion 2.8Ghz Pentium D, a Macbook Pro with 2.5 Ghz Intel Core 2 Duo running Parallels VM). Just how often this mystery hiccup of 15.625ms occurs differs between machines, but when it does, it is always 15.625ms exactly. Strange.

I have made a rather minimal test case that strips out all the video processing etc.
First, I created an MFC/COM Control project in the Project Wizard of Visual Studio 2003 and left things at their default settings (Apartment threading etc.). Then I added a single user defined call TestCall() to the control which does nothing (manually since there is no more classwizard)

Then I created a VB Client program which instantiates the control. It endlessly calls the TestTiming() sub which times how long a single call into the control takes and prints out that time.

The TestTiming call basically just does this:

Code:

    startTime = DateTime.Now

    Dim h = AxTestControl1.TestCall()

    endTime = DateTime.Now

    Dim ms As integer = endTime.Subtract(startTime).TotalMilliseconds

I print out calls that take 0 ms (well something less than 1ms anyway) as "." and for calls > 0ms I print out the actual ms. The output looks something like this:

.15.625 ms
.........15.625 ms
.........15.625 ms
.........15.625 ms
..........15.625 ms
..........15.625 ms
...........15.625 ms
..........15.625 ms
..........15.625 ms

So some variable nr of calls that execute quickly, as desired, and then a "hiccup" call that always takes the exact same amount of time (15.625ms), then some more quick calls.

If instead of the user defined control function .TestCall() inside the timing I use a standard control property, like

Code:

Dim h = AxTestControl1.Height

or a built in control method like

Code:

Dim h = AxTestControl1.ToString()

Then I never, ever get a hiccup call.

On different machines you will get a different average number of "." before a hiccup but even then the hiccup is 15.625ms

I should mention that the sample code spins off a background thread and calls the TimingTest from its ThreadTask(). This is the way the bug was originally reported to me. However, I can put the

Code:

Do

    TimingTest()

Loop

right in the main UI thread - as the first thing in Form1_Load() for example. And it will exhibit the same behaviour, except there will be substantially more good=0ms="." calls on average between the inevitable hiccups.

I *think* my timing test methodology is correct (?) And the fact that standard control properties and functions never hiccup indicate that the hiccups are not an artefact of my test setup, but related to a dispatched call into a user-defined function of the control.

Anybody have an idea what is going on and how I can prevent the far too frequent eating of half my per-frame processing budget by the runtime ?

I bow in gratitude for any advice :)

Mr.Toad

Specs:
Visual Studio 2003 .Net 1.1
Windows XP Pro SP2

Complete Form1.vb of the VB Client:

Code:

Imports System.Threading



Public Class Form1

    Inherits System.Windows.Forms.Form

    #Region " Windows Form Designer generated code "

    Private fMyThread As Thread



    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        ' to see the hiccup on the main UI thread, put the Do/TestTiming()/Loop here

        fMyThread = New Thread(AddressOf ThreadTask)

        fMyThread.Start()

    End Sub



    Private Sub ThreadTask()

        Do

            TestTiming()

        Loop

    End Sub



    Private Sub TestTiming()

        Dim startTime, endTime As System.DateTime



        startTime = DateTime.Now

        Dim h = AxTestControl1.TestCall() ' user defined control methods do cause frequent hiccups of 15.625ms

        'Dim h = AxTestControl1.ToString() ' standard control properties and method never cause a hiccup

        endTime = DateTime.Now



        Dim ms As Double = endTime.Subtract(startTime).TotalMilliseconds



        If (ms > 0) Then

            Console.WriteLine(ms & " ms")

        Else

            Static n As Integer = 0

            n += 1

            If (n Mod 80 = 0) Then Console.WriteLine("")

            Console.Write(".")

        End If

    End Sub

End Class

And the C++ component itself (it has quite a few automatically generated files, I show only what I think is most relevant here - ie changes from the boilerplate code from the MFC ActiveX Control C++ project template):

TestControlCtrl.cpp (I added the TestCall declaration and implementation, analogously in TestControlCtrl.h, not shown here)

Code:

....unmodified boilerplate code here



// Dispatch map

BEGIN_DISPATCH_MAP(CTestControlCtrl, COleControl)

    DISP_FUNCTION_ID(CTestControlCtrl, "AboutBox", DISPID_ABOUTBOX, AboutBox, VT_EMPTY, VTS_NONE)

    DISP_FUNCTION(CTestControlCtrl, "TestCall", TestCall, VT_I2, VTS_NONE)

END_DISPATCH_MAP()



....unmodified boilerplate code here



// CTestControlCtrl message handlers



short CTestControlCtrl::TestCall( void )

{

    return 0; // do nothing

}

TestControl.idl (I added the line with TestCall in it)

Code:

#include 

#include 



[ uuid(6E23484D-00D2-4500-A149-BF20F088CE00), version(1.0),

  helpfile("TestControl.hlp"),

  helpstring("TestControl ActiveX Control module"),

  control ]

library TestControlLib

{

    importlib(STDOLE_TLB);



    //  Primary dispatch interface for CTestControlCtrl



    [ uuid(E8A6BFC3-87DB-48DF-812A-2E79604C1AA3),

      helpstring("Dispatch interface for TestControl Control")]

    dispinterface _DTestControl

    {

        properties:

        methods:



            [id(DISPID_ABOUTBOX)] void AboutBox();

            [id(2)] int TestCall( void ); // I added this for my test

    };

...etc. (rest unchanged)

I attach the full sourcecode (Visual Studio solutions) for both the testing control and the VB.Net client code calling it.

Attached Files

TestingCode.zip (28.9 KB)

Copy data from datatable to ms access table

hoangnnm — Thu, 19 Nov 2009 12:34:09 GMT

Hi everyone , does any know how to copy a datatable to a ms access table with out using a loop to insert per row ? I think there must be a way to do that but i did search for 2 days and got no results !

XPath to get the nearest preceding sibling - howto?

senglory — Wed, 18 Nov 2009 23:31:58 GMT

I need to write a XPath for getting the closest sibling to the current node. It should return exactly 1 element. Also that sibling should match some other criterias like his attributes' values. How to write it?

Can't access WshShell object in VB.NET 2005

David Rothbauer — Wed, 18 Nov 2009 18:56:21 GMT

Hi;

I've written a small application for our ER. I did an upgrade to it (a very very minor one) and now my Windows.Forms.SendKeys is no longer working.

I've done some research and windows script hosting might be the answer.

The problem is that I can't figure out how to access WshShell...or set it.

I've added the script hosting reference and a reference to the wshom.ocx but neither of them seem to work.

Here's the line in vb scripting that I think I need an equivalent for in VB.NET

Code:

Set WshShell = WScript.CreateObject("WScript.Shell")

Can anyone help?

OO representation of relational database

secretagentman — Wed, 18 Nov 2009 16:34:15 GMT

I'm trying to convert 3 relational db tables (ones just like in access) into OO conceptual representations in which I need to note connectivity and (mandatory or optional) participation.

I have a "computer" table, a "made in" table, and a "description" table.

The computer table includes the made in & description PK's as FK's - How do I reference them in a simple OO diagram?

sending binary data to serial port

pfaisalbe — Wed, 18 Nov 2009 14:36:47 GMT

Hi

I wish to send binary data to device which is connected via serial port. I am using VB.Net 2005 with MScomm32. Here is the code

I have converted the binary value inton Hexadecimel.

MSComm1.Output = Chr(CInt(&H91))
MSComm1.Refresh()

Error thrown was

Exception from HRESULT: 0x800A017C (CTL_E_INVALIDPROPERTYVALUE)

Can anyone suggest a soultion

Thanks in advance

Faisal

Drupal developer, webmaster needed

Freelancer.Internet.com — Wed, 18 Nov 2009 10:20:08 GMT

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Development of a Webcam Feed Application

Freelancer.Internet.com — Wed, 18 Nov 2009 08:20:06 GMT

Summary: Application have to receive webcam feed into a simple dialogue box with controls (start, stop, take snapshot, exit). Objective: The webcam feed must be able to be detect automatically and ...

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Urgent! What is wrong with this program? Part 1

kayode — Wed, 18 Nov 2009 06:33:38 GMT

Please, i am writing a project on implementation of Rivest-Shamir-Adleman(RSA) algorithm on local area network(LAN).But the JAVA program i wrote refused to work. please, can anyone help me with this.The program is given below is only a part of the entire program due to space constraint. The remain program will be sent in the next post.Thanks

Code:

  import java.awt.*;

   import java.awt.event.*;

   import javax.swing.*;

   import java.lang.*;

public class My_RSA extends JFrame {

               private Container  container;

               private JFrame iFrame,jFrame, kFrame;

               private GridBagLayout layout;

               private GridBagConstraints constraints;

               private JTextField nField, dField;

               private JTextArea messageArea, cypherArea, plainArea,keysArea;

               private  JScrollPane messagescroll, cypherScroll, plainScroll;

               private JButton readButton, sendButton, okButton, cancelButton;

               private JPanel jPanel, nPanel,dPanel, okPanel,myPanel, mePanel,

   statusPanel, progressPanel,cancelPanel;

               private JPanel boardPanel1, boardPanel2, cypherPanel,plainPanel, 

  messagePanel, readPanel, sendPanel;

               private JLabel emptyLabel, jLabel, nLabel, dLabel, dumLabel1, dumLabel2, 

   statusLabel;

               private  JLabel emptyLabel1,  emptyLabel2 , emptyLabel3, emptyLabel4;

               private  JPanel emptyPanel,  emptyPanel1, emptyPanel2, emptyPanel3,

    emptyPanel4;

                private String message = "", plaintext = "", cyphertext = "", publish = "";

                private long d, e, m, n, p, q;

                 private final JProgressBar  current = new JProgressBar(0, 100);

           

                     private  KeyGenerator gen;

                     private  Encryption enc;

                     private  Decryption dec;

                     private  Sending go;

  public My_RSA()

   {

                Super("RSA Encryption System");



                 Container = getContentPane();

                 layout = new GridBagLayout();

                 container.setLayout(layout);

                 constraints = new GridBagConstraints();

                 gen = new KeyGenerator();

                 kFrame = new JFrame("Sending...");

                 mePanel = new JPanel();

                 mePanel.setLayout(layout);

                 progressPanel = new JPanel();

                 progressPanel.add(current);

                   cancelPanel = new JPanel();

                   statusPanel = new JPanel();

                   statusPanel = new JLabel(" From A to B");

                   statusPanel.add(statusLabel);

                   cancelButton = new JButton("cancel");

                   cancelButton.addActionListener(

              new ActionListener() {

                             public void actionPerformed(ActionEvent event)

                             {

                                            Current.setValue(0);

                                             kFrame.setVisible(false);

                                }

                     }

  );

   Current.setSize(100, 5);

   cancelPanel.add(cancelButton);

   emptyLabel1 = new JLabel("");

   emptyLabel2 = new JLabel("");

   emptyLabel3 = new JLabel("");

   emptyLabel4 = new JLabel("");

    emptyPanel1 = new JPanel();

    emptyPanel2 = new JPanel();

    emptyPanel3 = new JPanel();

    emptyPanel4= new JPanel();

        readPanel = new JPanel();

        sendPanel = new JPanel();

        messagePanel = new JPanel();

        cypherPanel = new JPanel();

        plainPanel = new JPanel()

         boardPanel1 = new JPanel();

         boardPanel1.setLayout(new FlowLayout()); 

         boardPanel2 = new JPanel();

         boardPanel2.setLayout(new FlowLayout());

           messageArea = new JTextArea(5,60);

           messageArea.setLineWrap(true);

           messageArea.setWrapStyleWord(true);

           messageArea.setFont(new Font("Monospaced",  Font.PLAIN, 12));

           messageArea.setEditable(true);

          cypherArea = new JTextArea(20,20);

          cypherArea.setLineWrap(true);

          cypherArea.setWrapStyleWord(true);

          cypherArea.setFont(new Font(" Serif",  Font.PLAIN, 12));

           cypherArea.setEditable(false);

           plainArea = new JTextArea(20,22);

           plainArea.setLineWrap(true);

           plainArea.setWrapStyleWord(true);

           plainArea.setFont(new Font(" Monospaced",  Font.PLAIN, 12));

           plainArea.setEditable(false);

           messageScroll = new JScrollPane(messageArea,

  ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,

  ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEVER);

              cypherScroll = new JScrollPane(cypherArea,

ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,

 ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);

             plainScroll = new JScrollPane(plainArea, 

 ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,

 ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);

             readButton = new JButton("read>>>");

             readButton.addActionListener(

                         new  ActionListener()  {

                                        public void actionPerformed(ActionEvent event)

                                         {

                                                      secretKey();

                                          }

                          }

 );

 sendButton = new JButton("send");

sendButton.addActionListener(

              new ActionListner() {

                            public void actionPerformed(ActionEvent event)

                            {

                                              kFrame.setVisible(false);

                                              publish = "";

                                              do {

                                                              p = gen.primeNumber();

                                             }while(!(p > 10)  || !(p < 26) );

                                             do {

                                                           q = gen.primeNumber();



                                              }while( (q <=p)  || !((q-p) >2) );

                                              n  = p*q;

                                              m = (p-1) * (q-1);

                                              e = gen.coprime(m);

                                              d = gen.find_d(m,e);

                                               message = messageArea.getText();

                                               enc = new Encryption(message);

                                                cyphertext = enc.encrypt(e,n);

                                                publish_Keys();

                                                kFrame.setVisible(true);

                                                go = newSending(cyphertext,kFrame,iFrame, 

     cypherArea, current, container);

                                                go.start();

                 kFrame.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));

                 container.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));

                                             }

                                }

                  );

                 cypherPanel.add(cypherScroll);

                 cypherPanel.setBorder(BorderFactory.createTitledBorder("cyphertext"));

                 readPanel.add(readButton);

                 plainPanel.add(plainScroll);

                plainPanel.setBorder(BorderFactory.createTitledBorder("recovered plaintext")); 

                  messagePanel.add(messageScroll);

                       sendPanel.add(sendButton);

                       emptyPanel1.add(emptyLabel1);

                       emptyPanel2.add(emptyLabel2);

                       emptyPanel3.add(emptyLabel3);

                       emptyPanel4.add(emptyLabel4);

                       boardPanel1.add(cypherPanel);

                       boardPanel1.add(readPanel);

                       boardPanel1.add(plainPanel);

cookie

Freelancer.Internet.com — Wed, 18 Nov 2009 04:50:04 GMT

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