Re: Calling a C++ DLL from C# - C# Discussion Boards

Rick Crone15-Nov-01 6:03

15-Nov-01 6:03

I have built a simple C# Windows Application and it runs on the machine I built it on fine.

I put the .EXE on another machine and tried to run it there it failed. It needed mscoree.dll so I added that to the directory the .EXE is in. Now I'm getting a .NET frame work initialization error. I guess I need to install the .NET frame work (maybe?).

If that is the problem, how do I do that without installing the Visual Studio.NET?

Rick Crone

Re: Running C# Windows Application

Nish Nishant15-Nov-01 13:41

Nish Nishant

15-Nov-01 13:41

You need to have the .NET runtime installed on target machines [its a 18-19 MB download]

Nish

Sonork ID 100.9786 voidmain

www.busterboy.org

Nish is a BIG fan of Goran Ivanisevic

URL for .NET redistributable

Nish Nishant15-Nov-01 13:50

Nish Nishant

15-Nov-01 13:50

download this and install it on the target machine

http://download.microsoft.com/download/VisualStudioNET/Trial/2.0/W982KMeXP/EN-US/dotnetfx.exe

Nish

Sonork ID 100.9786 voidmain

www.busterboy.org

Nish is a BIG fan of Goran Ivanisevic

Re: Running C# Windows Application

Paul Watson17-Nov-01 4:27

Paul Watson

17-Nov-01 4:27

Rick you need to install the .NET framework on the target machine. Developing for .NET brings along awhole slew of new things, including runtime baggage.

If you got VS.NET via an MSDN subscription then you should also have got a CD with the entire .NET Framework on it. Use that on the target machine.

From what I have heard there will be a "service pack" for Windows XP (not sure about 2000, but probably as well) that will include the .NET Framework. This should be released once .NET has gone gold.
Future versions of Windows will have it all built in. I can't wait Smile | :)

regards,
Paul Watson
Bluegrass
Cape Town, South Africa

Do you Sonork? I do! 100.9903 Stormfront

"The greatest thing you will ever learn is to love, and be loved in return" - Moulin Rouge

Re: Running C# Windows Application

5-Dec-01 22:51

Calling a C++ DLL from C#

Jose Fco Bonnin14-Nov-01 22:16

Jose Fco Bonnin

14-Nov-01 22:16

I have the next DLL:

".h"
#ifdef BABMD5_EXPORTS
#define BABMD5_API __declspec(dllexport)
#else
#define BABMD5_API __declspec(dllimport)
#endif

// This class is exported from the BabMD5.dll
class BABMD5_API CBabMD5 {
public:
CBabMD5(void);
};

BABMD5_API long WINAPI EncodeText(LPCTSTR p_sPlainText, LPTSTR p_sEncodedText, long nBufferLen);

".cpp"
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}

BABMD5_API long WINAPI EncodeText(LPCTSTR p_sPlainText,LPTSTR p_sEncodedText, long nBufferLen)
{
CMD5 m_md5;
// Here get the user name always in uppercase,
// and if we've got a NULL pointer then we fill it with an empty string
// We've done this way because of Visual Basic null strings

if(p_sPlainText!=NULL)
m_md5.setPlainText( _strupr((LPTSTR)p_sPlainText) );
else
m_md5.setPlainText("");

if (nBufferLen>32)
// and return the encoded string also un uppercase
strcpy(p_sEncodedText,_strupr((LPTSTR)m_md5.getMD5Digest()));

return 33;
}

// This is the constructor of a class that has been exported.
// see BabMD5.h for the class definition
CBabMD5::CBabMD5()
{
return;
}

I need call the function "EncodeText" from C# to do it I typed the next code:
[DllImport("BabMD5.dll")] static extern long EncodeText(
string p_password,
[MarshalAs(UnmanagedType.LPTStr)]string p_encText,
long p_size);
...
try {
string sText = "";
EncodeText("testestest",sText,33);
} catch(DllNotFoundException exc) {
Console.WriteLine(exc.ToString());
} catch(EntryPointNotFoundException exc) {
Console.WriteLine(exc.ToString());
}

But I doesn't return nothing. Anybody know what's happen?
Thank you.

Re: Calling a C++ DLL from C#

aner_glx15-Nov-01 22:24

aner_glx

15-Nov-01 22:24

Please read the article:
http://www.codeproject.com/csharp/unmanage.asp

your problem will be done.

The Internet Give a Chance to Learn. I Do!

Re: Calling a C++ DLL from C#

Jose Fco Bonnin16-Nov-01 4:37

Jose Fco Bonnin

16-Nov-01 4:37

The first thing that I've made was read the article, It's a good article where I found how to avoid the problem of load the dll and the method but my actual problem is that I can load and detect the method but this don't return nothing. I don't know what it's happening.

Re: Calling a C++ DLL from C#

aner_glx16-Nov-01 21:39

aner_glx

16-Nov-01 21:39

If you want to return 'sText', you must ref the var.
Try this:
[DllImport("BabMD5.dll")] static extern long EncodeText(
string p_password,
ref string p_encText,
long p_size);

EncodeText("testestest",ref sText,33);

The Internet Give a Chance to Learn. I Do!

WM_COPYDATA

rose33712-Nov-01 19:53

rose337

12-Nov-01 19:53

Good day. How do I send and receive WM_COPYDATA messages in C# that contain data? In particular, how do I unpack the COPYDATASTRUCT in C# when I get the WM_COPYDATA message? Sample code would be appreciated. Thanks Robert

C# and COM (Connection Points)

Anders Molin9-Nov-01 5:35

Anders Molin

9-Nov-01 5:35

I have a C# application, where I use a good old COM Object written in VC6. This is the easy part...

The COM Object implements Connection Points, to throw events to the client using it.
I can not get C# to catch those events. I have tried everything I can find in the documentation, but it don't work, the event-functions in C# is never called. Confused | :confused:

Anybody have a small sample of how to do this?

- Anders

Money talks, but all mine ever says is "Goodbye!"

problem registering class

dsdsds9-Nov-01 4:13

dsdsds

9-Nov-01 4:13

I have an exe-file and some .NET components (.dll) that the exe file uses. But when I try to start the exe file, I get the following error message. Does anybody know what to do here? Thanx,
ds

error message:
"class not registered."

========== Exception Text ==========
System.Runtime.InteropServices.COMException (0x80040154): class not registered
at System.Windows.Forms.AxHost.CreateInstance()
at System.Windows.Forms.AxHost.GetOcxCreate()
at System.Windows.Forms.AxHost.TransitionUpTo(Int32 state)
at System.Windows.Forms.AxHost.CreateHandle()
at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
at System.Windows.Forms.AxHost.EndInit()
at VMS.ITFieldEditor.VDlgITFE.InitializeComponent()
at VMS.ITFieldEditor.VDlgITFE..ctor()
at VMS.ITFieldEditor.VITFieldEditor..ctor()
at VMS.ITFEBridge.VITFEBridge..ctor()
at TestDotnetApp.MainWin.btnStart_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

========== Loaded Assemblies ==========
mscorlib
Assembly Version: 1.0.2411.0
Win32 Version: 1.0.2914.16
CodeBase: file:///c:/windows/microsoft.net/framework/v1.0.2914/mscorlib.dll
----------------------------------------
TestDotnetApp
Assembly Version: 8.0.0.0
Win32 Version: 8.0.0.0
CodeBase: ...
----------------------------------------
System
Assembly Version: 1.0.2411.0
Win32 Version: 1.0.2914.16
CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v1.0.2914/System.dll
----------------------------------------
System.Drawing
Assembly Version: 1.0.2411.0
Win32 Version: 1.0.2914.16
CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v1.0.2914/System.Drawing.dll
----------------------------------------
System.Windows.Forms
Assembly Version: 1.0.2411.0
Win32 Version: 1.0.2914.16
CodeBase: file:///C:/WINDOWS/assembly/GAC/System.Windows.Forms/1.0.2411.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
ITFEBridge
Assembly Version: 8.0.0.0
Win32 Version: 8.0.0.0
CodeBase: ...
----------------------------------------
TestDotnetApp.resources
Assembly Version: 8.0.0.0
Win32 Version: 8.0.0.0
CodeBase:...
----------------------------------------
ITFieldEditor
Assembly Version: 8.0.0.0
Win32 Version: 8.0.0.0
CodeBase:...
----------------------------------------
CBase
Assembly Version: 8.0.0.0
Win32 Version: 8.0.0.0
CodeBase: ...
----------------------------------------
CFieldEditor
Assembly Version: 8.0.0.0
Win32 Version: 8.0.0.0
CodeBase: ...
----------------------------------------
CImageViewer
Assembly Version: 8.0.0.0
Win32 Version: 8.0.0.0
CodeBase: ...
----------------------------------------
AxCCOREVIEWERLib
Assembly Version: 1.0.0.0
Win32 Version: 1.0.0.0
CodeBase: ...
----------------------------------------
CCOREVIEWERLib
Assembly Version: 1.0.0.0
Win32 Version: 1.0.0.0
CodeBase: ....
----------------------------------------
CUIBase
Assembly Version: 1.0.657.22684
Win32 Version: 1.0.657.22684
CodeBase: ...
----------------------------------------
CVisUtils
Assembly Version: 8.0.0.0
Win32 Version: 8.0.0.0
CodeBase:...
----------------------------------------
ITFieldEditor.resources
Assembly Version: 8.0.0.0
Win32 Version: 8.0.0.0
CodeBase: ...
----------------------------------------

Re: problem registering class

rchiav9-Nov-01 5:28

rchiav

9-Nov-01 5:28

Did you register your dll?

Read this page..

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpapndx/html/_cor_deployment_and_configuration.asp

update: also this link.. depending on what you're doing..

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cptools/html/cpgrfassemblyregistrationtoolregasmexe.asp

who can give me an example

7-Nov-01 14:54

i want to some code about sort files by it's type ,size etc

in listviewitem

thanks

Changing data on a different form

5-Nov-01 8:35

Stipulation - I'm doing this with notepad and the SDK.. no Visual Studio.

How do you get a spawend dialog to interact with the main form? With VB, it was as easy as referring to the main form and it's properties. It doesn't seem to be as easy with c#.. example code..

<pre>
using System;
using System.Windows.Forms;
using System.Drawing;

class MainForm : Form {

Button btnGo = new Button();

public MainForm() {

Text = "Main Form";
btnGo.Location = new Point(100,100);
btnGo.Name = "btnGo";
btnGo.Text = "Go";
btnGo.Click += new EventHandler(btnGo_Click);
Controls.Add(btnGo);
Opacity = 80;
}

public static void Main(string[] args) {
Application.Run(new MainForm());
}

private void btnGo_Click( object sender, EventArgs e) {

Form2 x = new Form2();
x.ShowDialog();
}
}

class Form2 : Form {

Button btn1 = new Button();

public Form2() {
Text = "This is the second form";
btn1.Text = "Do it";
btn1.Location = new Point(100,100);
btn1.Click += new EventHandler(btn1_Click);
btn1.Name = "btn1";
}

private void btn1_Click(object sender, EventArgs e) {
//Here is where I want to modify the main form.
// How would I go about changing, let's say, the Title?
}

}
</pre>

Re: Changing data on a different form

AndyG5-Nov-01 11:43

AndyG

5-Nov-01 11:43

Try this. I added 2 lines of code, one in the "Owner" form (btnGo_Click), and one in the "Owned" form (btn1_Click). Good Luck!

class MainForm : Form
{

Button btnGo = new Button();

public MainForm()
{
  Text = "Main Form";
  btnGo.Location = new Point(100,100);
  btnGo.Name = "btnGo";
  btnGo.Text = "Go";
  btnGo.Click += new EventHandler(btnGo_Click);
  Controls.Add(btnGo);
  Opacity = 80;
}

public static void Main(string[] args)
{
  Application.Run(new MainForm());
}

private void btnGo_Click( object sender, EventArgs e)
{
  Form2 x = new Form2();
  x.Owner = this;
  x.ShowDialog();
}
}

class Form2 : Form
{
Button btn1 = new Button();

public Form2()
{
  Text = "This is the second form";
  btn1.Text = "Do it";
  btn1.Location = new Point(100,100);
  btn1.Click += new EventHandler(btn1_Click);
  btn1.Name = "btn1";
  Controls.Add(btn1);
}

private void btn1_Click(object sender, EventArgs e)
{
  //Here is where I want to modify the main form.
  // How would I go about changing, let's say, the Title?
  this.Owner.Text = "HOWDY";
}

}

Andy Gaskell, MCSD

Re: Changing data on a different form

6-Nov-01 3:50

Perfect! Except for the fact I didn't add the control.

Thanks...

Class.forName()

Jamie Hale4-Nov-01 16:54

Jamie Hale

4-Nov-01 16:54

In Java, you can create an instance of an object by name by getting the Class object by name, and then calling createInstance() - or something like that.

Is this possible in C#? It looks like I might be able to do it through assemblies, but I'm not sure.

Application: I want to be able to provide a configuration file that lists the class names of add-ins to load. The app would loop through these names, create instances and use them.

I know I can do it with COM, but I'd rather not subject the authors of add-ins to writing COM servers.

Anyways, is this possible?

J

Re: Class.forName()

Chris Maunder15-Nov-01 14:04

Chris Maunder

15-Nov-01 14:04

You can use the Assembly class to load assemblies at runtime, the GetType function to get an object's type, and the Activator.CreateInstance static function to create an object of that type:

Assembly a = Assembly.Load("MyLibrary");
Type t = a.GetType("MyLibrary.MyClass");
object obj = Activator.CreateInstance(t);

cheers,
Chris Maunder (CodeProject)

Search files

Makyana4-Nov-01 3:08

Makyana

4-Nov-01 3:08

How to search for files/folders and adding all the found filenames to a collection.
For exemple :

Search all "*.url" files on "C:"

Thanks

Re: Search files

Andreas Philipson4-Nov-01 14:47

Andreas Philipson

4-Nov-01 14:47

The things you need is located in the namespace System.IO... I would do it like this:

using System.IO;

public void FindFiles (string path)
{
  if (Directory.Exists (path))
  {
    DirectoryInfo thisDir = new DirectoryInfo (path);
    FileInfo [] files = thisDir.GetFiles ("*url");
    DirectoryInfo [] subDirs = thisDir.GetDirectories ();

    foreach (FileInfo f in files)
    {
      //Do what you should with the files...
    }

    foreach (DirectoryInfo d in subDirs)
    {
      FindFiles (d.FullName);
    }
  }
}

Andreas Philipson

Output to MS Word using C#

1-Nov-01 8:41

My boss says...
I need to create MS Word 97/2000 documents using C#.
In other words, we want to use MS Word to display the output from a C# program.

Things will change in the Word document like address, date, From, To and some accounting data pulled from our Oracle database.

Of course, I'm a 3 month newbie to .NET & C# programming.
Can anyone kick start me with some examples/code/book recommendations?
I've got my "Learn C# in 21 Days" book ordered...

-Larry Eek! | :eek:

Re: Output to MS Word using C#

Eric Gunnerson (msft)2-Nov-01 6:15

Eric Gunnerson (msft)

2-Nov-01 6:15

Basically, what you'll need to do is use the Word OLE interface from COM interop.

As a first step, in VS you add a reference to the word exe (I think) to your project, and that will give you a managed wrapper around the COM interfaces.

You can also do this from the command line with tlbimp.

COM server in .Net

Christian B30-Oct-01 1:58

Christian B

30-Oct-01 1:58

Hi,

Does anyone know how to write a COM server in .Net?

// Christian

Re: COM server in .Net

Nish Nishant1-Nov-01 13:56

Nish Nishant

1-Nov-01 13:56

Create your .NET dll first
Now use regasm on it.
Now you can use this component using late binding

if you want early binding use tlbexp in it to generate a type library file

Nish

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