Managed C++/CLI

How to Declare & Handle the KeyEventArgs for a Sub from a Class ?

20-Apr-12 20:34

Thanks John Thumbs Up | :thumbsup:

Paramu197315-Apr-12 22:19

Re: How to Declare & Handle the KeyEventArgs for a Sub from a Class ?

15-Apr-12 22:19

I have a HeaderFile MyProject_Datas.h

C++

//MyProject_Datas.h 
public ref class MyUsefulDatas 
{ 
	blah...blah...blah... 
	public: static System::Void Item_Name( System::Object^ Sender, System::Windows::Forms::KeyEventArgs^ e) { 
	blah...blah...blah... 
	} 
	public: static System::Void Party_Name( System::Object^ Sender, System::Windows::Forms::KeyEventArgs^ e) { 
	blah...blah...blah... 
	} 
};

And now from my Form2 - textBox2 I would like to declare

C++

textBox2->KeyDown += gcnew KeyEventHandler(MyUsefulDatas, &MyUsefulDatas::Party_Name); ????????

Iam not getting the above line........

Also I would like to learn same statement, how to use in "delegate" statement like the below.....????

C++

textBox2->KeyDown += delegate { .....???????? }

Thanks...

Paramu197316-Apr-12 4:42

Convert C++/CLI code to Visual Studio 2002 Managed C++

16-Apr-12 4:42

After spending my whole day I found the crazier worth of the word, what is "static" ...

Also after removing the word "static" from the above declaration it works well..
Let it be useful to the searchers....

C++

//MyProject_Datas.h 
public ref class MyUsefulDatas 
{ 
public: System::Void Party_Name( System::Object^ Sender, System::Windows::Forms::KeyEventArgs^ e) { 
	blah...blah...blah... 
	} 
}; 

MyUsefulDatas^ MyUseDta=gcnew MyUsefulDatas;
				 
textBox2->KeyDown += gcnew KeyEventHandler(MyUseDta, &MyUsefulDatas::Party_Name);

Thanks...Thanks... Thumbs Up | :thumbsup:

modified 16-Apr-12 10:53am.

goncri11-Apr-12 10:10

goncri

11-Apr-12 10:10

Can I help to convert the next C++/CLI code to Visual Studio 2002 Managed C++?

C++

bool IsPrinterOk(String ^printerName)
{
    bool bResult=false;
    HANDLE hPrinter;


    IntPtr pPrinterName=Marshal::StringToHGlobalUni(printerName);
    WCHAR *pChar=(WCHAR *)pPrinterName.ToPointer();

    if(::OpenPrinter(pChar,&hPrinter,NULL)==0)
        return false;

    DWORD bytesNeeded;
    ::GetPrinter(hPrinter,2,0,0,&bytesNeeded);
    PRINTER_INFO_2 *pf=(PRINTER_INFO_2 *)GlobalAlloc(GPTR,bytesNeeded);

    if(::GetPrinter(hPrinter,2,(LPBYTE)pf,bytesNeeded,&bytesNeeded)!=0)
        if(pf->cJobs==0 && pf->Status==0)
            bResult=true;

    GlobalFree(pf);

    ClosePrinter(hPrinter);

    return bResult;
}

What changes must be made in the code?

Thanks.

Re: Convert C++/CLI code to Visual Studio 2002 Managed C++

Richard MacCutchan11-Apr-12 22:20

Re: Convert C++/CLI code to Visual Studio 2002 Managed C++

11-Apr-12 22:20

goncri wrote:
What changes must be made in the code?

Try compiling it and see what errors or warnings you receive.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Dave Doknjas12-Apr-12 12:03

Dave Doknjas

12-Apr-12 12:03

Are you sure you want 2002 Managed C++?
The pre-CLI managed C++ syntax was a failed experiment - the syntax was available only for a short time and it was quickly superceded by C++/CLI (even C++/CLI is not commonly used).

David Anton
Convert between VB, C#, C++, & Java
www.tangiblesoftwaresolutions.com

Convert from C# to VC++2010 dataGridView Enter-Key Movements?

Paramu19738-Apr-12 22:13

Re: Convert from C# to VC++2010 dataGridView Enter-Key Movements?

8-Apr-12 22:13

Hi,
I like to convert the following codes from c# to VC++2010. Thanks for the helps.

Actually the codes for dataGridView - Enter Key movement from one cell to another cell [like a tab key...]

public class MyDataGrid : DataGridView 
{
     // FOR ENTER KEY PROCESS WITH DATAGRIDVIEW
        protected override bool ProcessDialogKey(Keys keyData)
        {
            Keys key = keyData & Keys.KeyCode;
            if (key == Keys.Enter)
            {
                base.OnKeyDown(new KeyEventArgs(keyData));
                return true;
            }
            else
            {
                return base.ProcessDialogKey(keyData);
            }
        }
        //Class End
}

Thanks

Dave Doknjas10-Apr-12 10:45

Dave Doknjas

10-Apr-12 10:45

public ref class MyDataGrid : DataGridView
{
protected:
    virtual bool ProcessDialogKey(Keys ^keyData) override
    {
        Keys ^key = keyData & Keys::KeyCode;
        if (key == Keys::Enter)
        {
            DataGridView::OnKeyDown(gcnew KeyEventArgs(keyData));
            return true;
        }
        else
        {
            return DataGridView::ProcessDialogKey(keyData);
        }
    }
};

David Anton
Convert between VB, C#, C++, & Java
www.tangiblesoftwaresolutions.com

error C2061 - Form1 Rename Problem ?

Paramu19737-Apr-12 1:37

Re: error C2061 - Form1 Rename Problem ?

7-Apr-12 1:37

Hi,
Iam very new in VC++2010. And at first I create a new project, and I changed the name
Form1() as MyMainForm()...

And after it shows error MyProject.cpp

C++

#include "stdafx.h"
#include "MyMainForm.h"
blah...blah...blah...blah..

Application::Run(gcnew MyMainForm());

From the bove line it shows error C2061: Syntax error : Identifier 'MyMainForm'

So how to solve this problem...
Thanks For Startup... Thumbs Up | :thumbsup:

Paramu19737-Apr-12 2:26

Re: error C2061 - Form1 Rename Problem ?

7-Apr-12 2:26

Let it be usueful to someone like me..

Just I renamed the file - Form1 as MyMainForm in entire solution....
Then the error gets clear...

Thanks & Regards,
PARAMU Thumbs Up | :thumbsup:

Richard MacCutchan7-Apr-12 6:48

In Win32 OS, is single-precsion float faster than double?

7-Apr-12 6:48

This is fairly standard; if you change the name of any object, then you must change it everywhere.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

zipliu6-Apr-12 10:31

zipliu

6-Apr-12 10:31

I was wondering, when coding C++ in WinXP, if there is any performance difference (CPU cycles) between "float" (32bit) and "double" (64bit) variables.

Thanks.

Re: In Win32 OS, is single-precsion float faster than double?

Richard Andrew x646-Apr-12 15:49

Richard Andrew x64

6-Apr-12 15:49

This is the wrong forum for this question because it has nothing to do with C++/CLI.

Use the regular MFC forum instead.

The difficult we do right away...
...the impossible takes slightly longer.

Re: In Win32 OS, is single-precsion float faster than double?

Richard MacCutchan6-Apr-12 22:09

Re: In Win32 OS, is single-precsion float faster than double?

6-Apr-12 22:09

It depends on the hardware that you have as well as the software implementation. You would need to run some tests to check.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Albert Holguin15-Apr-12 16:05

Re: In Win32 OS, is single-precsion float faster than double?

15-Apr-12 16:05

Someone voted you down... D'Oh! | :doh:

Richard MacCutchan15-Apr-12 20:56

Re: In Win32 OS, is single-precsion float faster than double?

15-Apr-12 20:56

Thanks, but not to worry, there are 1-voters all over the place.

Binding 100,000 items to a list box can be just silly regardless of what pattern you are following. Jeremy Likness

Albert Holguin16-Apr-12 13:12

Re: In Win32 OS, is single-precsion float faster than double?

16-Apr-12 13:12

True

Albert Holguin15-Apr-12 16:05

Re: In Win32 OS, is single-precsion float faster than double?

15-Apr-12 16:05

Like Richard said, it will vary according to hardware (64bit systems will handle 64bit number a whole lot faster than 32bit systems) and whatever your software happens to be doing with it. For example, if you're using a 64bit number to keep track of some number of iterations, I suspect increased latency would be minimal (if noticeable at all).

Sean old school game guy7-May-12 10:55

Sean old school game guy

7-May-12 10:55

As posted previously it really depends on the hardware, but in general unless it is an older PC the difference will probably be neglible.

Thanks,
Sean

Fmod include errors

Member 79972644-Apr-12 13:55

Member 7997264

4-Apr-12 13:55

I am making a C++ program to play some mp3 files and am running into trouble. I am getting identifier not found errors. Can anyone give me some advice besides including the header?

Here is my code:

    #include "fmod.h"
    #include "windows.h"
    #include <string>
    #include <iostream>
    #include <msclr\marshal_cppstd.h>
    #include <conio.h>

    #pragma comment (lib, "fmodex64_vc.lib")

	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;
	using namespace std;

	/// <summary>
	/// Summary for Form1
	/// </summary>
	public ref class Form1 : public System::Windows::Forms::Form
	{

	public:
		FSOUND_SAMPLE* handle;
		Form1(void)
		{
			InitializeComponent();
			//
			//TODO: Add the constructor code here
			//
		}

	protected:
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		~Form1()
		{
			if (components)
			{
				delete components;
			}
		}
	private: System::Windows::Forms::TextBox^  textBox1;
	protected: 
	private: System::Windows::Forms::Label^  label1;
	private: System::Windows::Forms::ListBox^  list;
	private: System::Windows::Forms::Button^  button1;
	private: System::Windows::Forms::Button^  button2;


	private:
		/// <summary>
		/// Required designer variable.
		/// </summary>
		System::ComponentModel::Container ^components;

    #pragma region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		void InitializeComponent(void)
		{
			this->textBox1 = (gcnew System::Windows::Forms::TextBox());
			this->label1 = (gcnew System::Windows::Forms::Label());
			this->list = (gcnew System::Windows::Forms::ListBox());
			this->button1 = (gcnew System::Windows::Forms::Button());
			this->button2 = (gcnew System::Windows::Forms::Button());
			this->SuspendLayout();
			// 
			// textBox1
			// 
			this->textBox1->Location = System::Drawing::Point(97, 23);
			this->textBox1->Name = L"textBox1";
			this->textBox1->Size = System::Drawing::Size(518, 20);
			this->textBox1->TabIndex = 0;
			this->textBox1->TextChanged += gcnew System::EventHandler(this, &Form1::textBox1_TextChanged);
			// 
			// label1
			// 
			this->label1->AutoSize = true;
			this->label1->Location = System::Drawing::Point(12, 26);
			this->label1->Name = L"label1";
			this->label1->Size = System::Drawing::Size(79, 13);
			this->label1->TabIndex = 1;
			this->label1->Text = L"Libray Location";
			// 
			// list
			// 
			this->list->FormattingEnabled = true;
			this->list->Location = System::Drawing::Point(15, 80);
			this->list->Name = L"list";
			this->list->Size = System::Drawing::Size(757, 472);
			this->list->TabIndex = 2;
			// 
			// button1
			// 
			this->button1->Location = System::Drawing::Point(697, 571);
			this->button1->Name = L"button1";
			this->button1->Size = System::Drawing::Size(75, 23);
			this->button1->TabIndex = 3;
			this->button1->Text = L"Play";
			this->button1->UseVisualStyleBackColor = true;
			this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
			// 
			// button2
			// 
			this->button2->Location = System::Drawing::Point(616, 571);
			this->button2->Name = L"button2";
			this->button2->Size = System::Drawing::Size(75, 23);
			this->button2->TabIndex = 4;
			this->button2->Text = L"Refresh";
			this->button2->UseVisualStyleBackColor = true;
			this->button2->Click += gcnew System::EventHandler(this, &Form1::button2_Click);
			// 
			// Form1
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(784, 606);
			this->Controls->Add(this->button2);
			this->Controls->Add(this->button1);
			this->Controls->Add(this->list);
			this->Controls->Add(this->label1);
			this->Controls->Add(this->textBox1);
			this->Name = L"Form1";
			this->Text = L"Form1";
			this->ResumeLayout(false);
			this->PerformLayout();

		}

		private: System::Void textBox1_TextChanged(System::Object^  sender, System::EventArgs^  e) {
			
		}
		private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) {
			msclr::interop::marshal_context context;
			std::string standardString = context.marshal_as<std::string>(textBox1->Text);
			GetAllFiles(standardString);
			//list->Items->Add();
			
		}

		void GetAllFiles(string sPath){
		WIN32_FIND_DATA FindFileData;
		string sTmpPath = sPath;
		sTmpPath += "\\*.*";

		HANDLE hFind = FindFirstFile( sTmpPath.c_str(), &FindFileData );

		if ( hFind == INVALID_HANDLE_VALUE )
			return;
		else {
			do {
				if ( ( FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ) ) {
			// if directory:
					if ( strcmp(".", FindFileData.cFileName ) && strcmp("..", FindFileData.cFileName) ) {
				sTmpPath = sPath;
						sTmpPath += "\\";
				sTmpPath += FindFileData.cFileName;
						GetAllFiles( sTmpPath.c_str() );
					}
				}
				else // if file:
				{
					sTmpPath = sPath;
					sTmpPath += "\\";
					sTmpPath += FindFileData.cFileName;
					string fileType = sTmpPath.substr(sTmpPath.length()-3, sTmpPath.length());
					if(fileType == "mp3"){
						String^ myTempPath = gcnew String(sTmpPath.c_str());
						list->Items->Add(myTempPath);//cout << sTmpPath << endl;
					}
				}
			} while ( FindNextFile( hFind, &FindFileData) != 0 );

			FindClose( hFind );
		}
		return;
	}

		private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
			// init FMOD sound system
		    FSOUND_Init (44100, 32, 0);

		    // load and play mp3
		    handle=FSOUND_Sample_Load (0,"E:\\Steve\\Music\\2 Pac\\Unknown Album\\Temptations.mp3",0, 0, 0);
		    FSOUND_PlaySound (0,handle);
			FSOUND_Sample_Free (handle);
			FSOUND_Close();
		}
};

Here are my errors:

1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(26): error C2143: syntax error : missing ';' before '*'
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(26): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(26): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(187): error C3861: 'FSOUND_Init': identifier not found
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h (190): error C2065: 'handle' : undeclared identifier
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(190): error C3861: 'FSOUND_Sample_Load': identifier not found
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(191): error C2065: 'handle' : undeclared identifier
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h (191): error C3861: 'FSOUND_PlaySound': identifier not found
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(192): error C2065: 'handle' : undeclared identifier
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(192): error C3861: 'FSOUND_Sample_Free': identifier not found
1>c:\users\steve\documents\visual studio 2010\projects\testforms\testforms\Form1.h(193): error C3861: 'FSOUND_Close': identifier not found
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Re: Fmod include errors

Richard Andrew x644-Apr-12 17:40

Richard Andrew x64

4-Apr-12 17:40

What do you mean "besides including the header?" Obviously you're missing a header file.

The difficult we do right away...
...the impossible takes slightly longer.

VC++: cant manipulate forms

Member 875813424-Mar-12 22:05

Member 8758134

24-Mar-12 22:05

I've just started a new VC++ Form project. I understand that I can manipulate my forms through events on the generated form header file.

However, for better design, I want to be able to update the form from external controlling objects (for instance when new data is generated in the system at large).

The problem is, in the generated main file, Application::Run( gcnew <formname>() ); means that I can't send any commands through (e.g. changing text on a button) because this is constantly running until the form is closed.

How do you typically deal with this? Am I approaching this in the wrong manner?

Many Thanks in advance for your help.

Re: VC++: cant manipulate forms

f907334125-Mar-12 7:17

f9073341

25-Mar-12 7:17

Some more info on my setup. I'm running Visual Studio Express 2008 and I'm currently using a Windows Form Application.

I really just want to know how to update the form from outside the form (if that makes sense).

I thought this might be the answer, but I'm not familiar with properties:

http://msdn.microsoft.com/en-us/library/cakx2hdw(v=vs.80).aspx#Y360

Thanks.

Re: VC++: cant manipulate forms

Albert Holguin25-Mar-12 15:12