Managed C++/CLI

Re: Registering Window Class

16-Jul-07 9:51

As a general rule, use the Afx functions in an MFC app and use the API functions in a Win32 app.

You can put the call anywhere as long as it gets called before attempting to create a window of
the registered class. PreCreateWindow() is fine.

Mark

Mark Salsbery
Microsoft MVP - Visual C++

"Great job team! Head back to base for debriefing and cocktails."

john john mackey16-Jul-07 11:52

john john mackey

16-Jul-07 11:52

I am still lost and now frustrated (with MSDN documentation on the matter.)

What I have is a dialog based app and inside my OnInitDialog(), I have put what is the beginnings of registering my window class..

When I do this, i get the runtime "warning" that "A required resource was unavailable." (i trace this to the second call to ::GetClassInfo() as I don't know how to properly supply the 2nd parameter.)

<code>BOOL CMyDlg::OnInitDialog()
{
	CDialog::OnInitDialog();
//yadda yadda yadda

	// register MyOwnApp window class if not already registered

	WNDCLASS	wndcls;
	HINSTANCE hInst = AfxGetInstanceHandle();

	if( !(::GetClassInfo(hInst, MYOWNAPP_CLASSNAME, &wndcls)) )
	{
		if( ::GetClassInfo( hInst, NULL, &wndcls ))
		{
			wndcls.lpszClassName = MYOWNAPP_CLASSNAME;
//			wndcls.hIcon = LoadIcon(hInst, MAKEINTRESOURCE(IDR_MAINFRAME));
			if( !AfxRegisterClass(&wndcls) )
			{
				AfxThrowResourceException();
				return FALSE;
			}
		}
		else
		{
			AfxThrowResourceException();
			return FALSE;
		}
	}

	return TRUE;  // return TRUE  unless you set the focus to a control
}
</code>

Re: Registering Window Class

Mark Salsbery16-Jul-07 12:28

Embedded null characters in record

16-Jul-07 12:28

I don't think you need the second call. Even if you did, using NULL as the second param isn't
documented.

If the first call fails, go ahead and register the class.

Actually, you can just call AfxRegisterClass(). MFC will check if it's already registered Smile | :)

Mark

Mark Salsbery
Microsoft MVP - Visual C++

"Great job team! Head back to base for debriefing and cocktails."

BuckBrown16-Jul-07 8:36

BuckBrown

16-Jul-07 8:36

Hi, I'm using Visual Studio 2005 C++/CLI. I have a file with the following format:

DEVICE : TK65603
WAFER : 08
LOT : 006X
52 NULL 20 NULL 31 NULL <carriage return="">
52 NULL 18 NULL 26 NULL <carriage return="">...for 1000 records.

I am trying to set up a FileStream to read the data from this file for processing.

FileStream^ fileStream = gcnew FileStream(strFilePath, FileMode::Open);
StreamReader^ streamReader = gcnew StreamReader(fileStream);

The following reads the first threee lines just fine.
strDeviceName = streamReader->ReadLine();
strWaferNumber = streamReader->ReadLine();
strLotNumber = streamReader->ReadLine();

But then if I try to read the next line the command terminates at the NULL character and all I have in my variable is the first of the three fields (52). I have tried some variations of BiaryReader also. What approach would anyone recommend to work around this issue?

Buck

Re: Embedded null characters in record

Paul Conrad21-Jul-07 18:53

Paul Conrad

21-Jul-07 18:53

Are you still having trouble with this?

"Any sort of work in VB6 is bound to provide several WTF moments." - Christian Graus

Re: Embedded null characters in record

BuckBrown23-Jul-07 12:09

BuckBrown

23-Jul-07 12:09

No, I'm just reading the file one character at a time and checking for nulls. Seems to be working fine.

Thanks.

Buck

Re: Embedded null characters in record

Paul Conrad23-Jul-07 12:13

Paul Conrad

23-Jul-07 12:13

Sounds like you have it right now. Any problems let me know Smile | :)

"Any sort of work in VB6 is bound to provide several WTF moments." - Christian Graus

globale vairable for two diffrente methode

abbd16-Jul-07 5:54

Re: globale vairable for two diffrente methode

16-Jul-07 5:54

hello,
how to declare a globale variable for 2 or all methodes ?

Mark Salsbery16-Jul-07 7:02

How to overload "=" operator in a class?

16-Jul-07 7:02

Is there a good reason you need to use global variables in a C++/CLI application?

If so, you can simply define a variable in any CPP file, outside of any function or class
declaration:

// Global int
int MyGlobalInt = 0;

To access the global variable from another CPP module, use "extern":

// MyGlobalInt exists in another module
extern int MyGlobalInt;

Mark

Mark Salsbery
Microsoft MVP - Visual C++

"Great job team! Head back to base for debriefing and cocktails."

ShadowBoi15-Jul-07 17:59

ShadowBoi

15-Jul-07 17:59

Hi, everyone,

Postfix p;
char *postfix = p.convertToPostfix(infix);
//p.convertToPostfix(infix) returns a pointer

I would like to write a method in Postfix class to overload the "=" operator so that the left pointer gets a deep copy of the right pointer(returns from a method in the class).

How do I write it?

Thanks.

Re: How to overload "=" operator in a class?

Mark Salsbery16-Jul-07 7:16

16-Jul-07 7:16

Here's one way (you'll have to do the actual deep copy yourself since I don't know the details of
your class - my sample implementation just demonstrates a possible deep copy scenario):

class Postfix
{
protected:
   someclass *pSomeClass;
public;
   Postfix* operator=(const Postfix *Src);
};
 
Postfix *Postfix::operator=(const Postfix *Src)
{
   // Perform deep copy of src to this object
   // (I used "this->" for clarity - these can be ommitted)
 
   if (this->pSomeClass)
      delete this->pSomeClass;
   this->pSomeClass = new someclass(...);
   ... copy Src->pSomeClass to this->pSomeClass ...
 
   return this;
}

Mark Salsbery
Microsoft MVP - Visual C++

"Great job team! Head back to base for debriefing and cocktails."

listView c++ cli

abbd15-Jul-07 8:42

Re: listView c++ cli [modified]

15-Jul-07 8:42

hi;

i would add in listView, for this i need to declare an array of string:

String *subItems[] = new String*[10];<br />
subItems[4]="1";<br />
subItems[2]="2";<br />
subItems[3]="3";<br />
subItems[1]="4";<br />
subItems[5]="5";<br />
<br />
<br />
ListViewItem* itm = new ListViewItem(subItems);<br />
listView1->Items->Add(itm);

but it didn't work,
i try for :

<br />
cli::array<String ^, 1> ^ tabChaine = gcnew cli::array<String ^>(3);<br />
tabChaine[0] = "Element 1";<br />
tabChaine[1] = "Element 2";<br />
tabChaine[2] = "Element 3";<br />
<br />
this->listView1->Items->Add(tabChaine);

=> there are error :Error cannot convert parameter 1 from 'cli::array<type,dimension> ^' to 'System::String ^'

Thank you verry mutch

Mark Salsbery15-Jul-07 10:01

15-Jul-07 10:01

You need to use the .NET framework classes documentation.

There's no ListView.ListViewItemCollection.Add() overload that takes an array of Strings as a
parameter.

You could add one string at a time:

listView1->Items->Add("Element 1");
listView1->Items->Add("Element 2");
listView1->Items->Add("Element 3");

or maybe use ListView.ListViewItemCollection.AddRange().

Mark

-- modified at 16:07 Sunday 15th July, 2007

Mark Salsbery
Microsoft MVP - Visual C++

"Great job team! Head back to base for debriefing and cocktails."

George L. Jackson15-Jul-07 15:46

George L. Jackson

15-Jul-07 15:46

By the way, your code is wrong as far as creating an array of strings! It should be:

<br />
array<String^>^ tabChaine = gcnew array<String^>(3);<br />

"We make a living by what we get, we make a life by what we give." --Winston Churchill

Mark Salsbery16-Jul-07 7:18

16-Jul-07 7:18

I assumed his angle brackets got html-formatted out.

That could be a completely invalid assumption Smile | :)

Cheers,
Mark

Mark Salsbery
Microsoft MVP - Visual C++

"Great job team! Head back to base for debriefing and cocktails."

George L. Jackson17-Jul-07 11:44

George L. Jackson

17-Jul-07 11:44

Sorry, your assumption was correct. I loaded the source HTML and found:

cli::array<String ^, 1> ^ tabChaine = gcnew cli::array<String ^>(3);

I guess we need to learn to check "Ignore HTML tags in this message" more often.

Big Grin | :-D

Geo

P.S. Thanks for your great answers and sense of humor in this forum.

"We make a living by what we get, we make a life by what we give." --Winston Churchill

Mark Salsbery17-Jul-07 13:12

Declaration of global variables

17-Jul-07 13:12

George L. Jackson wrote:
I loaded the source HTML and found

Too much work for me....if I can't assume (wrongly or not) I'll ask the OP to repost.
I'm lazy Smile | :)

Thank you for your great posts as well! I just migrated all my code to VS2005 within the last
week. I've been using managed extensions for .NET coding so I put alot of stuff off so I
wouldn't get nailed with migration issues. Now that I can use it, I'm always watching posts for
new tips on managed code!

Cheers,
Mark

Mark Salsbery
Microsoft MVP - Visual C++

"Great job team! Head back to base for debriefing and cocktails."

abbd14-Jul-07 14:02

14-Jul-07 14:02

i have creat capture.h et capture.cpp, in 1st i declared all variables us folow:

 <br />
class capture<br />
{<br />
public:<br />
	 capture(void);<br />
	~capture(void);<br />
public:<br />
	int i;<br />
	int k;<br />
	void Ap();<br />
};

and for capture.cpp

<br />
#include "StdAfx.h"<br />
 <br />
#include ".\capture.h"<br />
 <br />
using namespace System;<br />
 <br />
void capture::Ap() {...........................}

When i add capture.h {#include "capture.h"}in forme1.h, knowing that variable i déclared in capture.h.
In form1.h i use a variable i without declaration, there are error 'i' : undeclared identifier .

Please help me,

Thank you verry mutch

Mark Salsbery14-Jul-07 16:52

14-Jul-07 16:52

You haven't shown any global variables. All the variables shown are members of the class
capture.

You also didn't show how and where you try to use 'i'.

Mark

Mark Salsbery
Microsoft MVP - Visual C++

This episode brought to you by the number 3

abbd15-Jul-07 1:10

15-Jul-07 1:10

i use it us folow

public ref class Form1 : public System::Windows::Forms::Form<br />
{public:<br />
Form1(void)<br />
{			InitializeComponent();<br />
						//<br />
			//TODO: Add the constructor code here<br />
			//<br />
<br />
			<br />
		}<br />
<br />
	protected:<br />
		/// <summary><br />
		/// Clean up any resources being used.<br />
		/// </summary><br />
		~Form1()<br />
		{<br />
			if (components)<br />
			{<br />
				delete components;<br />
			}<br />
		}<br />
<br />
<br />
<br />
<br />
#pragma region Windows Form Designer generated code<br />
		/// <summary><br />
		/// Required method for Designer support - do not modify<br />
		/// the contents of this method with the code editor.<br />
		/// </summary><br />
		void InitializeComponent(void)<br />
		{.............................}<br />
<br />
<br />
<br />
<br />
private: System::Void button12_Click(System::Object^  sender, System::EventArgs^  e) {<br />
<br />
for (i=0;i<3;i++){...........}<br />
}.<br />
.<br />
.

thank you verry mutch

Mark Salsbery15-Jul-07 6:26

15-Jul-07 6:26

'i' would have to be used in a "capture" class method. 'i' is not global.

button12_Click() is not a capture class method so you need to define an automatic variable 'i'.

Two examples (2 different scopes for 'i'):

for (int i=0;i<3;i++){...........}

or

int i;
for (i=0;i<3;i++){...........}

Mark

Mark Salsbery
Microsoft MVP - Visual C++

"Great job team! Head back to base for debriefing and cocktails."

abbd15-Jul-07 7:45

15-Jul-07 7:45

But when i was modified in button12, i can't see the modification in back of button12,
i would declare i in capture.h, and use it in form1.h by adding #include "capture.h", but unfortunaly this variable can't be identifiable in form1.h

Help me,

Thank you verry mutch