Managed C++/CLI Discussion Boards

Re: How to write a application for auto detect new HDD on windows 10

Richard MacCutchan15-Jul-19 22:12

Richard MacCutchan

15-Jul-19 22:12

Sorry, this site does not provide code to order; try freelancer.com.

I have 3rd party .OCX file. and i need to create wrapper to make it usable in C#

Gaurav__Kapoor26-May-19 23:11

Gaurav__Kapoor

26-May-19 23:11

I have 3rd party . OCX file. which loads in HTML scripts and do desired work

Below Steps I have used while creating a Wrapper:

1: In visual Studio-> VC++-CLR-ClassLibrary project
2: Project add Reference (.ocx file)
3: Ref: i am abe to see Interop.Filelib.1.0
4: now in Project.h i am trying to use Filelib but not able to create any object or instance.

While i tried to create an Activex project and added .ocx file getting below stuff and i am not able to understand how to use it and create an wrapper for C#.

class CDNXCardReaderX : public CWnd
{
protected:
DECLARE_DYNCREATE(CDNXCardReaderX)
public:
CLSID const& GetClsid()
{
static CLSID const clsid
= { 0x222BBB5D, 0xE9FC, 0x4EB6, { 0x9E, 0xD0, 0x41, 0x10, 0x2C, 0x95, 0xC0, 0x3A } };
return clsid;
}
virtual BOOL Create(LPCTSTR lpszClassName, LPCTSTR lpszWindowName, DWORD dwStyle,
const RECT& rect, CWnd* pParentWnd, UINT nID,
CCreateContext* pContext = NULL)
{
return CreateControl(GetClsid(), lpszWindowName, dwStyle, rect, pParentWnd, nID);
}

BOOL Create(LPCTSTR lpszWindowName, DWORD dwStyle, const RECT& rect, CWnd* pParentWnd,
UINT nID, CFile* pPersist = NULL, BOOL bStorage = FALSE,
BSTR bstrLicKey = NULL)
{
return CreateControl(GetClsid(), lpszWindowName, dwStyle, rect, pParentWnd, nID,
pPersist, bStorage, bstrLicKey);
}

// Attributes
public:

// Operations
public:

long OpenSessionSync(long Timeout)
{
long result;
static BYTE parms[] = VTS_I4 ;
InvokeHelper(0x2d, DISPATCH_METHOD, VT_I4, (void*)&result, parms, Timeout);
return result;
}

I am totally clueless on what approach shall i use to create object and call these functions.

Re: I have 3rd party .OCX file. and i need to create wrapper to make it usable in C#

phil.o26-May-19 23:22

phil.o

26-May-19 23:22

May that can help you?:
C# - Hook into existing COM object | Stack Overflow[^]

noop()

Re: I have 3rd party .OCX file. and i need to create wrapper to make it usable in C#

Richard MacCutchan26-May-19 23:36

Richard MacCutchan

26-May-19 23:36

You already posted this in the C/C++ forum: please do not repost.

Data Shifting on Some Computers

Erich Ruth3-May-19 7:18

Erich Ruth

3-May-19 7:18

I have a program that works fine on most machines. Every now and then I find a
computer and the edit boxes are shifted to the right. I have an image of the
shifting here

http://ruthtechnology.com/temp/Untitled2.jpg[^]

In the past, I use to be able to go to display settings and change it from 125% to 100% and reboot and the boxes would line up nicely with the form. But its on a 100% and I dont know why its not lining up.

Any comments or suggestions are greatly appreciated.

Handle leak in application complied with CLR option.

atm.menon2-May-19 1:15

atm.menon

2-May-19 1:15

In my C++ application, I have added CLR support((/clr) to use WCF communication.

Everything is working well, but i observed handle leak. When I analyze this with WinDbg(!htrace). Its shows handle leaks in .NET libs as shown below.

Handle = 0x0000000000003300 - OPEN
Thread ID = 0x0000000000004dbc, Process ID = 0x000000000000414c

0x000000007785a30a: ntdll!ZwCreateThreadEx+0x000000000000000a
0x000007fefd37ac73: KERNELBASE!CreateRemoteThreadEx+0x0000000000000163
0x00000000776e57a6: KERNEL32!CreateThread+0x0000000000000036
0x000007fedaf3f0aa: clr!ClrCreateManagedInstance+0x000000000001ae0a
0x000007fedaf3efb8: clr!ClrCreateManagedInstance+0x000000000001ad18
0x000007fedaf3f5e3: clr!ClrCreateManagedInstance+0x000000000001b343
0x000007fedaf3f623: clr!ClrCreateManagedInstance+0x000000000001b383
0x000007fedaeb3b5e: clr!PreBindAssemblyEx+0x0000000000007e5e
0x000007fedae0a05f: clr!LogHelp_LogAssert+0x000000000000525f
0x000007fedae0837c: clr!LogHelp_LogAssert+0x000000000000357c
0x000007fedae08125: clr!LogHelp_LogAssert+0x0000000000003325
--------------------------------------
Handle = 0x00000000000032fc - OPEN
Thread ID = 0x0000000000004dbc, Process ID = 0x000000000000414c

0x0000000077859d0a: ntdll!ZwCreateEvent+0x000000000000000a
0x000007fefd372d15: KERNELBASE!CreateEventExW+0x0000000000000065
0x000007fedaf3db8a: clr!ClrCreateManagedInstance+0x00000000000198ea
0x000007fedaf3dd27: clr!ClrCreateManagedInstance+0x0000000000019a87
0x000007fedaf3f077: clr!ClrCreateManagedInstance+0x000000000001add7
0x000007fedaf3efb8: clr!ClrCreateManagedInstance+0x000000000001ad18
0x000007fedaf3f5e3: clr!ClrCreateManagedInstance+0x000000000001b343
0x000007fedaf3f623: clr!ClrCreateManagedInstance+0x000000000001b383
0x000007fedaeb3b5e: clr!PreBindAssemblyEx+0x0000000000007e5e
0x000007fedae0a05f: clr!LogHelp_LogAssert+0x000000000000525f
0x000007fedae0837c: clr!LogHelp_LogAssert+0x000000000000357c
0x000007fedae08125: clr!LogHelp_LogAssert+0x0000000000003325
0x000007fedaeb5abf: clr!PreBindAssemblyEx+0x0000000000009dbf
0x00000000776e571d: KERNEL32!BaseThreadInitThunk+0x000000000000000d
--------------------------------------
Handle = 0x00000000000032f8 - OPEN
Thread ID = 0x0000000000004dbc, Process ID = 0x000000000000414c

0x0000000077859d0a: ntdll!ZwCreateEvent+0x000000000000000az
0x000007fefd372d15: KERNELBASE!CreateEventExW+0x0000000000000065
0x000007fedaf3db8a: clr!ClrCreateManagedInstance+0x00000000000198ea
0x000007fedaf3dd19: clr!ClrCreateManagedInstance+0x0000000000019a79
0x000007fedaf3f077: clr!ClrCreateManagedInstance+0x000000000001add7
0x000007fedaf3efb8: clr!ClrCreateManagedInstance+0x000000000001ad18
0x000007fedaf3f5e3: clr!ClrCreateManagedInstance+0x000000000001b343
0x000007fedaf3f623: clr!ClrCreateManagedInstance+0x000000000001b383
0x000007fedaeb3b5e: clr!PreBindAssemblyEx+0x0000000000007e5e
0x000007fedae0a05f: clr!LogHelp_LogAssert+0x000000000000525f
0x000007fedae0837c: clr!LogHelp_LogAssert+0x000000000000357c
0x000007fedae08125: clr!LogHelp_LogAssert+0x0000000000003325
0x000007fedaeb5abf: clr!PreBindAssemblyEx+0x0000000000009dbf
0x00000000776e571d: KERNEL32!BaseThreadInitThunk+0x000000000000000d

Am using VS 2015 and .Net version is 4.5.2.

Is this an issue in .NET? Any help and or suggestions you may have would be greatly appreciated, Thanks

Arun Menon

Generic List Template, Function Parameter

Brennan Salibrici24-Apr-19 2:09

Brennan Salibrici

24-Apr-19 2:09

Hello All.

I'm trying to create a function that can loop through a list of Windows::Forms::Controls (I know there's no loop below, I'm just keeping it simple for sake of testing) and perform a task. Right now I have a function which works properly:

C++

 void mCtrlWrap::IsVisible(bool TF, List<Windows::Forms::TextBox^>^ list)

{
	if (TF == true)
	{
		list[0]->Visible = true;
		list[0]->BackColor = Color::Azure;
	}
	else if (TF != true)
	{
		list[0]->Visible = false;
	}

}

but i want to make the List parameter a template so that it take List<windows::forms::combobox^>^ as a parameter or List<windows::forms::label^>^, etc.

I've tried

C++

template<typename T>
 void mCtrlWrap::IsVisible(bool TF, System::Collections::Generic::List<T>^ list)

{
	if (TF == true)
	{
		list[0]->Visible = true;
		list[0]->BackColor = Color::Azure;
	}
	else if (TF != true)
	{
		list[0]->Visible = false;
	}

}

which compiles just fine but i get linking errors:
1>MainScreen.obj : error LNK2020: unresolved token (06000001) mCtrlWrap::IsVisible<system::windows::forms::textbox ^="">

can someone please help me figure out what I'm doing wrong?

Thanks

Brennan

Re: Generic List Template, Function Parameter

Richard MacCutchan24-Apr-19 2:56

Richard MacCutchan

24-Apr-19 2:56

In C# you would handle this by casting each component to a Control object. I assume you can do the same in C++/CLI.

Also, why do you need the else if clause above? TF can only be true or false, if it is not true then you only need a simple else clause for the second block, thus:

C++

if (TF == true) // or just if (TF)
{
    // what to do if it is true
}
else
{
    // what to do if it is false
}

Re: Generic List Template, Function Parameter

11917640 Member 2-May-19 4:44

11917640 Member

2-May-19 4:44

You are mixing C++ template and .NET generics. This is OK is you understand what are you doing.
In your specific case, this is classic C++ template problem. To call templated function C++ compiler must see the function implementation, and not only prototype. So, you can instantiate IsVisible function only in the same .cpp file. Or make it inline by moving the function implementation to .h file.

LocationApi.dll having issue while trying to fetch location.

Anurag__4-Mar-19 20:29

Anurag__

4-Mar-19 20:29

I used following link:-
ILocation::GetReportStatus | Microsoft Docs[^][^]

Got code for Geolocation:-

at line :-

CoCreateInstance(CLSID_Location, NULL, CLSCTX_INPROC, IID_PPV_ARGS(&pLocation));

I am getting handle = S_OK & showing message "Type information not available in locationApi.dll symbols."

Please help if any idea.
Thanks in advance.

Re: LocationApi.dll having issue while trying to fetch location.

Richard MacCutchan4-Mar-19 22:51

Richard MacCutchan

4-Mar-19 22:51

Where are you getting that message?

Re: LocationApi.dll having issue while trying to fetch location.

Anurag__12-Mar-19 21:45

Anurag__

12-Mar-19 21:45

In visual studio 2008, while debugging from my desktop & laptop both.

Re: LocationApi.dll having issue while trying to fetch location.

Richard MacCutchan12-Mar-19 23:20

Richard MacCutchan

12-Mar-19 23:20

That is probably just a debug message. Does your application continue running?

Re: LocationApi.dll having issue while trying to fetch location.

Anurag__14-Mar-19 22:13

Anurag__

14-Mar-19 22:13

No, It was not running.
I even checked in VS 2015.
When it fails, it is not able to get lat., long., etc.Nothing is coming.

Re: LocationApi.dll having issue while trying to fetch location.

Richard MacCutchan15-Mar-19 0:05

Richard MacCutchan

15-Mar-19 0:05

It is impossible to guess what is happening. You will need to use your debugger to gather more information.

Re: LocationApi.dll having issue while trying to fetch location.

Anurag__15-Mar-19 0:26

Anurag__

15-Mar-19 0:26

Ok let me gather more information in detail, then i will get back to you.
For now thank you for helping me.
Have a nice day.

C++/CLI + /std:c++latest is broken in VS 2017 15.9.6

John Schroedl14-Feb-19 5:22

John Schroedl

14-Feb-19 5:22

[Marking as NEWS - this is not a question but this is an appropriate forum IMO]

If you develop in C++/CLI with Visual Studio 2017, beware that update 15.9.6 introduced a very bad codegen bug. C++/CLI apps will crash if you use /std:c++17 or /std:c++latest. The workaround is to drop back to C++14 language support.

Here's the issue if you care to vote.

Again, this is FYI as it has cost me multiple days of work diagnosing why our application suddenly stopped working.

John

where to include new class in c# , windows forms, visual studio

Member 1412466126-Jan-19 6:50

Member 14124661

26-Jan-19 6:50

Hi,
I am working on some examples of my own and now looking to include a new class for my Banking transactions.

Seems like I am doing something in the wrong place etc.
I typed in the new code ahead of the standard code created by Visual Studio (17) (I didn't add an item). The information I wanted to create appears in the right hand window CLASS VIEW but I get the errors.

using System.Windows.Forms;
public class transactiondata
{
    public DateTime transDT;
    public string transtext;
    public double transRECD;
    public double transPAID;
    public string transFlag;
}
//parameterised Constructor
public transactiondata(DateTime transDT, string transtext, double transRECD, double transPAID, string transFlag)
{
    this.transDT = transDT;
    this.transtext = transtext;
    this.transRECD = transRECD;
    this.transPAID = transPAID;
    this.transFlag = transFlag;
    return;
}
namespace Santander01
{  
    public partial class Form1 : Form
    {
        public Form1()

CLASS VIEW
shows the class and items above
THE ERROR
1>------ Build started: Project: Santander01, Configuration: Debug Any CPU ------
1>C:\Users\HOME\Documents\Visual Studio 2017\Projects\Santander01\Santander01\Form1.cs(19,8,19,23): error CS0116: A namespace cannot directly contain members such as fields or methods
1>C:\Users\HOME\Documents\Visual Studio 2017\Projects\Santander01\Santander01\For

Any help appreciated

Re: where to include new class in c# , windows forms, visual studio

Richard MacCutchan8-Feb-19 4:03

Richard MacCutchan

8-Feb-19 4:03

You have terminated the class definition too early; the constructor is not inside it. Move the closing brace from where it is now, to the line following the end of the constructor block.

Re: where to include new class in c# , windows forms, visual studio

Richard Deeming8-Feb-19 7:15

Richard Deeming

8-Feb-19 7:15

C# questions should be posted in the C# forum[^].

You've posted this in the "Managed C++/CLI" forum, which is nothing to do with C#. Smile | :)

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: where to include new class in c# , windows forms, visual studio

Richard MacCutchan8-Feb-19 23:40

Richard MacCutchan

8-Feb-19 23:40

Maybe he though that in the CodeProject numbering system, C++/CLI = C#. Wink | ;)

How to format DATETIME

Member 1412466121-Jan-19 1:56

Member 14124661

21-Jan-19 1:56

I am trying to build some simple examples as part of my learning process.
I have created a form which includes the dateTimePicker and tried several combinations which have failed. The output initially displays time as HH:MM:00 and only dis[plays correct time when I include
...AddHours(0)...
I'd like to format - say

"MMMM dd, yyyy - dddd"

My standard output is

20/02/2019 00:00:00

private: System::Void button3_Click(System::Object^  sender, System::EventArgs^  e) {
	String ^myText = "1&2-END";
	dateTimePicker2->CustomFormat = "MMMM dd, yyyy - dddd";
	dateTimePicker2->Value = DateTime::Now.AddDays(+30).Date;//dateTimePicker2->Value = DateTime::Today;
	myText = myText + "\r\n" + dateTimePicker2->Value;
	dateTimePicker2->Value = DateTime::Now.AddDays(+30).AddHours(0);//dateTimePicker2->Value = DateTime::Today;
	myText = myText + "\r\n" + dateTimePicker2->Value;
	//myText = myText->Format('YYYY-MM-DD');
	myText= myText + "\r\n" + "& 3 -END"; 
	//dateTimePicker2.DateTimePickerFormat -> "MMMM dd, yyyy - dddd";
	//dateTimePicker2.DateTimePickerFormat.Custom;;
	myTB2->Text = myText;
}

I am using Visual Studio 2017, C++/CLi, W10 Professional
Guess I am missing some declaration - I have in .cpp

#include "MyFirstForm.h"
#include <iostream>
#include <fstream>
#include <string>

//#include 
using namespace System;
using namespace System::Windows::Forms;
using namespace System::IO;
[STAThreadAttribute]

Any help appreciated.
Looks like great way to develop FORM & C++ based programs

Re: How to format DATETIME

Richard MacCutchan21-Jan-19 2:57

Richard MacCutchan

21-Jan-19 2:57

You probably need to use the DateTimePicker.ToString Method (System.Windows.Forms) | Microsoft Docs[^] to format the date and time properly.

Re: How to format DATETIME

Member 1412466121-Jan-19 3:42

Member 14124661

21-Jan-19 3:42

Hi & many thanks for your response....however

I added the following:-

dateTimePicker2->Value = DateTime::Now.AddDays(1);
MessageBox::Show(dateTimePicker2.ToString());
myTB2->Text = myText;

and failed to complie with the following error - is this what you meant.
When I follow your link it refers to C# whereas I am working with C##.

Severity	Code	Description	Project	File	Line	Suppression State
Error	C2228	left of '.ToString' must have class/struct/union	Project1	c:\users\home\documents\visual studio 2017\projects\project1\project1\myfirstform.h	335	
Error (active)	E0153	expression must have class type	Project1	C:\Users\HOME\Documents\Visual Studio 2017\Projects\Project1\Project1\MyFirstForm.h	336

Re: How to format DATETIME

Richard MacCutchan21-Jan-19 3:44

Richard MacCutchan

21-Jan-19 3:44

C++

dateTimePicker2->Value = DateTime::Now.AddDays(1);
MessageBox::Show(dateTimePicker2.ToString());   // Needs pointer access characters "->", not "."

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.