Linking two programs via Windows API

I am writing a program to enhance the usability of an already written program. Someone suggested that I interface the two via the windows API: The program I would like to add functionality to was not written in java and I do not have access to the source code. What was suggested to me was that I track down the handles for the buttons on the program (the buttons being the only important features I need access to) and connect that way.
This seemed like a good idea....except I have no idea what this guy was talking about! Can someone explain this to me or at least point me in the right direction?
Thank you very much,
Plastech

So how would I find out how to access the buttons
found in the other application? What is all this
talk of handles? I am really not very familiar with
the windows api.Neither am I. After all, this is a Java board.
And how is it possible that I could access those
handles from a different program?The "different program" needs to allow you to access them, of course, by offering the appropriate interface.

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Hi Hassan,
Thank you for sharing the code with us!
As I understand it, your code handles the situation of an user that is already logged on to an interactive window station (those of you, who need to create a UI-process of a user not yet logged on, could use
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To make it easier to read, I'll post here the C#-version of your code:
using System;
using System.Runtime.InteropServices;
using System.Diagnostics;
namespace WindowsServiceLaunchingExe
class NativeMethods
[StructLayout(LayoutKind.Sequential)]
public struct PROCESS_INFORMATION {
public IntPtr hProcess;
public IntPtr hThread;
public System.UInt32 dwProcessId;
public System.UInt32 dwThreadId;
[StructLayout(LayoutKind.Sequential)]
public struct SECURITY_ATTRIBUTES {
public System.UInt32 nLength;
public IntPtr lpSecurityDescriptor;
public bool bInheritHandle;
[StructLayout(LayoutKind.Sequential)]
public struct STARTUPINFO {
public System.UInt32 cb;
public string lpReserved;
public string lpDesktop;
public string lpTitle;
public System.UInt32 dwX;
public System.UInt32 dwY;
public System.UInt32 dwXSize;
public System.UInt32 dwYSize;
public System.UInt32 dwXCountChars;
public System.UInt32 dwYCountChars;
public System.UInt32 dwFillAttribute;
public System.UInt32 dwFlags;
public short wShowWindow;
public short cbReserved2;
public IntPtr lpReserved2;
public IntPtr hStdInput;
public IntPtr hStdOutput;
public IntPtr hStdError;
[StructLayout(LayoutKind.Sequential)]
public struct PROFILEINFO {
public int dwSize;
public int dwFlags;
[MarshalAs(UnmanagedType.LPTStr)]
public string lpUserName;
[MarshalAs(UnmanagedType.LPTStr)]
public string lpProfilePath;
[MarshalAs(UnmanagedType.LPTStr)]
public string lpDefaultPath;
[MarshalAs(UnmanagedType.LPTStr)]
public string lpServerName;
[MarshalAs(UnmanagedType.LPTStr)]
public string lpPolicyPath;
public IntPtr hProfile;
internal enum SECURITY_IMPERSONATION_LEVEL {
SecurityAnonymous = 0,
SecurityIdentification = 1,
SecurityImpersonation = 2,
SecurityDelegation = 3
internal enum TOKEN_TYPE {
TokenPrimary = 1,
TokenImpersonation = 2
[DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern bool CreateProcessAsUser(IntPtr hToken, string lpApplicationName, string lpCommandLine, ref SECURITY_ATTRIBUTES lpProcessAttributes, ref SECURITY_ATTRIBUTES lpThreadAttributes, bool bInheritHandles, uint dwCreationFlags, IntPtr lpEnvironment, string lpCurrentDirectory, ref STARTUPINFO lpStartupInfo, ref PROCESS_INFORMATION lpProcessInformation);
[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool DuplicateTokenEx(IntPtr hExistingToken, uint dwDesiredAccess, ref SECURITY_ATTRIBUTES lpTokenAttributes, SECURITY_IMPERSONATION_LEVEL ImpersonationLevel, TOKEN_TYPE TokenType, ref IntPtr phNewToken);
[DllImport("advapi32.dll", SetLastError = true)]
private static extern bool OpenProcessToken(IntPtr ProcessHandle, int DesiredAccess, ref IntPtr TokenHandle);
[DllImport("userenv.dll", SetLastError = true)]
private static extern bool CreateEnvironmentBlock(ref IntPtr lpEnvironment, IntPtr hToken, bool bInherit);
[DllImport("userenv.dll", SetLastError = true)]
private static extern bool DestroyEnvironmentBlock(IntPtr lpEnvironment);
private const short SW_SHOW = 1;
private const short SW_SHOWMAXIMIZED = 7;
private const int TOKEN_QUERY = 8;
private const int TOKEN_DUPLICATE = 2;
private const int TOKEN_ASSIGN_PRIMARY = 1;
private const int GENERIC_ALL_ACCESS = 268435456;
private const int STARTF_USESHOWWINDOW = 1;
private const int STARTF_FORCEONFEEDBACK = 64;
private const int CREATE_UNICODE_ENVIRONMENT = 0x00000400;
private const string gs_EXPLORER = "explorer";
public static void LaunchProcess(string Ps_CmdLine)
IntPtr li_Token = default(IntPtr);
IntPtr li_EnvBlock = default(IntPtr);
Process[] lObj_Processes = Process.GetProcessesByName(gs_EXPLORER);
// Get explorer.exe id
// If process not found
if (lObj_Processes.Length == 0)
// Exit routine
return;
// Get primary token for the user currently logged in
li_Token = GetPrimaryToken(lObj_Processes[0].Id);
// If token is nothing
if (li_Token.Equals(IntPtr.Zero))
// Exit routine
return;
// Get environment block
li_EnvBlock = GetEnvironmentBlock(li_Token);
// Launch the process using the environment block and primary token
LaunchProcessAsUser(Ps_CmdLine, li_Token, li_EnvBlock);
// If no valid enviroment block found
if (li_EnvBlock.Equals(IntPtr.Zero))
// Exit routine
return;
// Destroy environment block. Free environment variables created by the
// CreateEnvironmentBlock function.
DestroyEnvironmentBlock(li_EnvBlock);
private static IntPtr GetPrimaryToken(int Pi_ProcessId) {
IntPtr li_Token = IntPtr.Zero;
IntPtr li_PrimaryToken = IntPtr.Zero;
bool lb_ReturnValue = false;
Process lObj_Process = Process.GetProcessById(Pi_ProcessId);
SECURITY_ATTRIBUTES lObj_SecurityAttributes = default(SECURITY_ATTRIBUTES);
// Get process by id
// Open a handle to the access token associated with a process. The access token
// is a runtime object that represents a user account.
lb_ReturnValue = OpenProcessToken(lObj_Process.Handle, TOKEN_DUPLICATE, ref li_Token);
// If successfull in opening handle to token associated with process
if (lb_ReturnValue) {
// Create security attributes to pass to the DuplicateTokenEx function
lObj_SecurityAttributes = new SECURITY_ATTRIBUTES();
lObj_SecurityAttributes.nLength = Convert.ToUInt32(Marshal.SizeOf(lObj_SecurityAttributes));
// Create a new access token that duplicates an existing token. This function
// can create either a primary token or an impersonation token.
lb_ReturnValue = DuplicateTokenEx(li_Token, Convert.ToUInt32(TOKEN_ASSIGN_PRIMARY | TOKEN_DUPLICATE | TOKEN_QUERY), ref lObj_SecurityAttributes, SECURITY_IMPERSONATION_LEVEL.SecurityIdentification, TOKEN_TYPE.TokenPrimary, ref li_PrimaryToken);
// If un-successful in duplication of the token
if (!lb_ReturnValue) {
// Throw exception
throw new Exception(string.Format("DuplicateTokenEx Error: {0}", Marshal.GetLastWin32Error()));
else {
// If un-successful in opening handle for token then throw exception
throw new Exception(string.Format("OpenProcessToken Error: {0}", Marshal.GetLastWin32Error()));
// Return primary token
return li_PrimaryToken;
private static IntPtr GetEnvironmentBlock(IntPtr Pi_Token) {
IntPtr li_EnvBlock = IntPtr.Zero;
bool lb_ReturnValue = CreateEnvironmentBlock(ref li_EnvBlock, Pi_Token, false);
// Retrieve the environment variables for the specified user.
// This block can then be passed to the CreateProcessAsUser function.
// If not successful in creation of environment block then
if (!lb_ReturnValue) {
// Throw exception
throw new Exception(string.Format("CreateEnvironmentBlock Error: {0}", Marshal.GetLastWin32Error()));
// Return the retrieved environment block
return li_EnvBlock;
private static void LaunchProcessAsUser(string Ps_CmdLine, IntPtr Pi_Token, IntPtr Pi_EnvBlock) {
bool lb_Result = false;
PROCESS_INFORMATION lObj_ProcessInformation = default(PROCESS_INFORMATION);
SECURITY_ATTRIBUTES lObj_ProcessAttributes = default(SECURITY_ATTRIBUTES);
SECURITY_ATTRIBUTES lObj_ThreadAttributes = default(SECURITY_ATTRIBUTES);
STARTUPINFO lObj_StartupInfo = default(STARTUPINFO);
// Information about the newly created process and its primary thread.
lObj_ProcessInformation = new PROCESS_INFORMATION();
// Create security attributes to pass to the CreateProcessAsUser function
lObj_ProcessAttributes = new SECURITY_ATTRIBUTES();
lObj_ProcessAttributes.nLength = Convert.ToUInt32(Marshal.SizeOf(lObj_ProcessAttributes));
lObj_ThreadAttributes = new SECURITY_ATTRIBUTES();
lObj_ThreadAttributes.nLength = Convert.ToUInt32(Marshal.SizeOf(lObj_ThreadAttributes));
// To specify the window station, desktop, standard handles, and appearance of the
// main window for the new process.
lObj_StartupInfo = new STARTUPINFO();
lObj_StartupInfo.cb = Convert.ToUInt32(Marshal.SizeOf(lObj_StartupInfo));
lObj_StartupInfo.lpDesktop = null;
lObj_StartupInfo.dwFlags = Convert.ToUInt32(STARTF_USESHOWWINDOW | STARTF_FORCEONFEEDBACK);
lObj_StartupInfo.wShowWindow = SW_SHOW;
// Creates a new process and its primary thread. The new process runs in the
// security context of the user represented by the specified token.
lb_Result = CreateProcessAsUser(Pi_Token, null, Ps_CmdLine, ref lObj_ProcessAttributes, ref lObj_ThreadAttributes, true, CREATE_UNICODE_ENVIRONMENT, Pi_EnvBlock, null, ref lObj_StartupInfo, ref lObj_ProcessInformation);
// If create process return false then
if (!lb_Result) {
// Throw exception
throw new Exception(string.Format("CreateProcessAsUser Error: {0}", Marshal.GetLastWin32Error()));
To use the code, create a new windows service project, and add code like the following one:
using System;
using System.Diagnostics;
using System.ServiceProcess;
using System.Timers;
namespace WindowsServiceLaunchingExe
public partial class ExeLauncherSvc : ServiceBase
public ExeLauncherSvc() {
InitializeComponent();
Timer timer;
protected override void OnStart(string[] args) {
timer = new Timer(5000);
timer.Elapsed += (sender, e) => {
try {
timer.Stop();
EventLog.WriteEntry("WindowsServiceLaunchingExe", "Launching process...");
NativeMethods.LaunchProcess(@"C:\Windows\notepad.exe");
} catch (Exception ex) {
EventLog.WriteEntry("WindowsServiceLaunchingExe", ex.Message);
timer.Start();
protected override void OnStop() {
Because NativeMethods.LaunchProcess() throws exceptions on errors, be sure to enclose calling code in a try/catch-block.
I also would recommend reading this:
Stephen Martin - The Perils and Pitfalls of Launching a Process Under New Credentials
http://asprosys.blogspot.com/2009/03/perils-and-pitfalls-of-launching.html
Stephen Martin - Launch Process From Service (code download)
http://www.asprosys.com/Downloads/LaunchProcessFromService.zip
Marcel

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How to open two program in one click??

hi there Java lovers , can anyone help me on this ?
I want to open two program ( 2 windows ) after I click on a button... how can I do this ??
please help me & Thanks for the help ....

hi there Java lovers , can anyone help me on this ?
I want to open two program ( 2 windows ) after I click
on a button... how can I do this ??
please help me & Thanks for the help ....I suppose that you can open 2 windows,two Dialog windows.You cann't open 2 Frame windows at the same time.
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Fillern1 wrote:
Yeah, that doesn't really do it. because both are still connected to the same timeline, although not the same time in the timeline.
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Okay - this is a bit tricky, but i'll try and explain the problem, then ask for the solution, because it may be that someone knows a better way to deal with this.. might get a bit long, sorry - if a solution comes up this will enable all of us to make more memory efficient LV code so please read on..
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LV8.6.1 patch something
Win XP
Solved!
Go to Solution.

Hi Enrico
Finally I can give something to the community that has given me so much :-)
The "official" statement is that "yes we know it is a problem".. Not sure what that will do to the future..
I have the problem on 8.6.1 as well - and in fact it is a general LV problem, that I first time reported to NI with LV8.2 as I was pissed by the fact that even the smallest exe file would consume + 50MB of memory until you manually minimized the window. Well - thanks to the feedback from Cosmin I seem to have solved the problem.
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For future reference to this forum, it is attached here including the .dll required to call - it is a LV8.6.1 file as I have not had the time to yet again test every single function of my program for new problems that could occur with upgrading to LV2009
I hope this solves your problem..
best regards
Jacob
www.10EaZy.com
Attachments:
EmptyProcess.zip ‏32 KB

Program in windows 8.1 "not responding"

I have an Imac computer and have installed parallels desktop 9 for mac. I also installed windows 8.1. When I download programs in windows 8.1 sometimes I get the message "not responding". You can use the program but then you get the message "not
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Unfortunately your post is off topic here, in the TechNet Site Feedback forum, because it is not Feedback about the TechNet Website or Subscription. This is a standard response I’ve written up in advance to help many people (thousands, really.)
who post their question in this forum in error, but please don’t ignore it. The links I share below I’ve collected to help you get right where you need to go with your issue.
For technical issues with Microsoft products that you would run into as an
end user of those products, one great source of info and help is
http://answers.microsoft.com, which has sections for Windows, Hotmail, Office, IE, and other products. Office related forums are also here:
http://office.microsoft.com/en-us/support/contact-us-FX103894077.aspx
For Technical issues with Microsoft products that you might have as an
IT professional (like technical installation issues, or other IT issues), you should head to the TechNet Discussion forums at
http://social.technet.microsoft.com/forums/en-us, and search for your product name.
For issues with products you might have as a Developer (like how to talk to APIs, what version of software do what, or other developer issues), you should head to the MSDN discussion forums at
http://social.msdn.microsoft.com/forums/en-us, and search for your product or issue.
If you’re asking a question particularly about one of the Microsoft Dynamics products, a great place to start is here:
http://community.dynamics.com/
If you really think your issue is related to the subscription or the TechNet Website, and I screwed up, I apologize! Please repost your question to the discussion forum and include much more detail about your problem, that could include screenshots
of the issue (do not include subscription information or product keys in your screenshots!), and/or links to the problem you’re seeing.
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I've installed windows 8 preview with an acer T230H touchscreen.
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- one screen for the boards
It's difficult to get applications from metro to the desktop. You can not make photos or videos or snippets. You can not turn the picture or resize them. There is only one board. I don't know how to add weblinks on the metro side. You lose mach time by switching the desktop to metro.
Im waiting for an update of the bulletin board instead of windows 8.
The libretto has a good combination of a Desktop Computer and a smartphone. Windows 8 is neighter a good desktop nor a good board for apps. Neighter Metro nor the Desktop are complete.
Please tell toshiba to upgrade the bulletin board!!! It has much potential and should be opened with an SDK for external extensions and applications.

I want to create serial communicatios between two notebooks via Bluetooth

Hi,
I'm trying to accomplish serial communications between two laptops via a Bluetooth connection.
The two laptops are NOT Toshiba notebook, but they are both running the Toshiba Bluetooth Stack For Windows. They are also both using the default Bluetooth Manager program that is supplied by Toshiba and Dell (just rebadged?).
Basically I can set up a connection no problems, but then I send serial data from one computer and watch the receiving serial port on the other computer but nothing ever arrives.
Are there any good tutorials for this? It would be nice to have something for the Toshiba Bluetooth Manager in particular as the windows and buttons will have the names as explained in the tutorial.
Thanks in advance.
Adam

I tried it for tests purpose via a hyperterminal connection and it worked.
Maybe the description contains also some helpful information for you.
Here is it:
PC1:
Start "Bluetooth Settings->Custom Mode->Select Remote PC->Select 'Serial Port'->Accept proposed COM port (in my case COM40)->Confirm wizard windows
until setup is finished".
PC2:
Start "HyperTerminal->Select COM7"
PC1:
Start "HyperTerminal->Select COM40 (in my case. See step 1 above)"
PC1, PC2:
Enter the same Passkey if security is turned on e.g. "0000"
PC1:
Everything what you type into HyperTerminal should be visible in HyperTerminal of PC2 and vice versa.

Windows 8 from TechNet/MSDN to Windows 8.1 via Windows Store, Possible ?

Windows 8 from TechNet/MSDN can not be updated to Windows 8.1 via Windows Store.
It says this edition dose not support update via Store.
Considering that Win8.1 is free for Win8 users, is there a way to bypass this ?
Can MSDN Windows 8 be converted to Proper Retail Win8 ?

Windows 8.1 available from MSDN Subscriber Downloads as well Vladimir, so you can get it from there if your subscription is still active.
More information about updating to 8.1 on the Windows Store available here: http://windows.microsoft.com/en-us/windows-8/why-can-t-find-update-store.
This is more of a Windows 8 question because the windows team controls how updates work for their product. I'd post this question over in http://answers.microsoft.com in the Windows section.
Thanks,
Mike
Unfortunately your post is off topic here, in the MSDN Subscriptions feedback forum, because it is not feedback regarding the MSDN Subscription. This is a standard response I’ve written up in advance to help many people (thousands, really.) who
happen to post their question in my forum, but please don’t ignore it. The links provided below I’ve collected to help with many issues we’ve seen.
For technical issues with Microsoft products that you would run into as an end user of those products, one great source of info and help is
http://answers.microsoft.com, which has sections for Windows, Hotmail, Office, IE, and other products. Office related forums are also here:
http://office.microsoft.com/en-us/support/contact-us-FX103894077.aspx
For Technical issues with Microsoft products that you might have as an IT professional (like more technical installation issues, or other IT issues), you should head to the TechNet Discussion forums at
http://social.technet.microsoft.com/forums/en-us, and search for your product name.
For issues with products you might have as a Developer (like how to talk to APIs, what version of software do what, or other developer issues), you should head to the MSDN discussion forums at
http://social.msdn.microsoft.com/forums/en-us, and search for your product or issue.
If you’re asking a question particularly about one of the Microsoft Dynamics products, a great place to start is here:
http://community.dynamics.com/
If you really think your issue is related to the MSDN Subscription, and I screwed up, I apologize! Please repost your question to the discussion forum and include much more detail about your problem, that could include screenshots of the issue
(do not include subscription information or product keys in your screenshots!), and/or links to the problem you’re seeing.
If you really have no idea where to post this question, then you shouldn’t have posted here, because we have a forum just for you! It’s called the ‘Where is the forum for…?’ forum and its here:
http://social.msdn.microsoft.com/forums/en-us/whatforum/
Please review the topic of the forum you’re posting in before posting your question. Moving your post to the off topic forum.
Thanks, Mike
MSDN and TechNet Subscriptions Support

Linking two songs

I searched and couldn't find anything on this. What I'd like to do is "link" two songs so that when I play songs from my library in shuffle mode, if the first song comes up, it is automatically followed by the second. For example, Queen's "We will rock you" followed by "We are the Champions" just seems right.
Any ideas?
Thanks in advance.
Mike

Are these MP3 files? If so, try a program called MP3 Splitter/Joiner. It would nice to logically link the songs in iTunes but I don't know if that can be done. Physically joining the files may be the only option.
There are two tracks that I'd lke to link as well. It is the diva singing in "The Fith Element" tracks: "Lucia Di Lammermoor" and "The Diva Dance".
MP3 Splitter/Joiner:
http://www.ezsoftmagic.com/
Enjoy life!
Steven
Home built PC Windows XP X-Fi Platinum soundcard + Klipsch Promedia Ultra 5.1 speakers

Linking two programs via Windows API

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