Multidimension arrays - Managed C++/CLI Discussion Boards

Jun Du26-Jun-06 16:51

26-Jun-06 16:51

It looks like the case. But under C# category, VS 2005 supports a few Device project templates. I can't figure out why there is no C+/CLI support for Device development. Sigh | :sigh:

Best,
Jun

Re: Hi Alls

vassilux@27-Jun-06 2:12

vassilux@

27-Jun-06 2:12

I got an answer from Microsoft about C++/CLI for Smart Device :
There are no plans for C++/CLI on devices. Native C/C++ plus P/Invoke/COM can be used to interop with legacy C/C++ code.

Re: Hi Alls

Jun Du27-Jun-06 3:40

Jun Du

27-Jun-06 3:40

Thanks for the heads-up.

Best,
Jun

Need help to return string value from COM

agarunk19-Jun-06 4:41

agarunk

19-Jun-06 4:41

I'm trying to create a .dll using ATL, which I want use in C#.

Can anybody please guide me to create a simple method / function which takes string in input parameters and returns the same(string)..

I tried a lot but always faced problem of returing string back to calling function in C#.

I did the same with C++ class library successfully but when it comes to ATL its not the same.

As I'm using other SDK API's in creation of .dll and I can't go with Class Library its having problem with "CLR and MTd". Which can't go together. Finally I decided to stick to ATL.

Now please guide me to create the methods which I can use in C# to get the string value.

Arun

Re: Need help to return string value from COM

Milton Karimbekallil19-Jun-06 21:58

Milton Karimbekallil

19-Jun-06 21:58

Use the below signature for the COM method. Then use RCW to call this method from .Net
[id(1)] HRESULT ReturnString([in,out] BSTR stringValue);

cheers....MIlton KB

Stack problem with setting callback in native code.

dbriggs19-Jun-06 4:15

dbriggs

19-Jun-06 4:15

I have a 3th party dll writen in C. I have no problem calling most functions in the dll from the managed code. But there is a function that take a function pointer for setting a callback function that I am having problems with.
I have the following code:

First in a wrapper class

[DllImport("w32dll.dll")]
static void dllSetCallFp( void (*aFp)(void*) );

Then in seperate class.

delegate void funDelegate(void*);
typedef void (__cdecl *FUNPT)(void*);
funDelegate ^ fp  = gcnew funDelegate(MFun);
pin_ptr<funDelegate^> pp = &fp;
IntPtr ip = Marshal::GetFunctionPointerForDelegate(fp);
FUNPT cb  = static_cast<FUNPT>(ip.ToPointer());

Wrapper::dllSetCallFp(cb);

MFun is just a test function.

void Client::MFun(void* pV)
{
	int i = 9;
}

The problem is I can debug into the calling of MFun but when I return I get the following errors
Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.
Then
'FatalExecutionEngineError'

Can anyone help me with this?
-Thanks

Re: Stack problem with setting callback in native code.

Jun Du27-Jun-06 7:27

Jun Du

27-Jun-06 7:27

Just a thought. Is it possible to use a function pointer directly, instead of marshalling from a delegate?

Best,
Jun

Multidimension arrays

Preminition18-Jun-06 11:57

Preminition

18-Jun-06 11:57

Multidimension arrays

Read dozens of examples given on website how to do an single array with
the System::Array etc. But I can't get the hang of it how to use it properly.
I keep getting error messages when I hit the build button.

For example I want a simple 2 dimension array of the integer type.
in the old code it was:
int board[16][16];
board[3][3] = 5;

if i try to use the managed version:
array<int^,2>^ m_Board = gcnew array<int^,2>(16,16);
for (int row = 0; row < 16;row++)
{
for (int col = 0; col < 16;col++)
{
m_Board[row][col] = 0;
}
}

Confused | :confused:

I get error message on my screen.

Also I can't find anything about freeing the memory in the articles.
Is it neccessary if you use it in a class.
How do I free it if it's necessary?
Can I change the size of the area dynamically?

"Knowledge shouldn't be preserved by one, but shared with others."
-- Preminition

Re: Multidimension arrays

Michael Dunn18-Jun-06 13:38

Michael Dunn

18-Jun-06 13:38

That should be array<int,2> not array<int^,2> since you want the array to contain ints.

--Mike--
Visual C++ MVP Cool | :cool:

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VB > soccer

Re: Multidimension arrays

2bee 18-Jun-06 20:14

2bee

18-Jun-06 20:14

Hello,

you might want to read this article as well

http://www.codeproject.com/managedcpp/cppcliarrays.asp[^]

Best regards Tobias Wink | ;)

DataGrid/DataGridView within a MFC dialog

Kulch4216-Jun-06 11:10

Kulch42

16-Jun-06 11:10

I'm having a problem using the DataGrid/DataGridView within a MFC dialog (using the CWinFormsControl< > template).

I create a DataSet from a Xml file and then set it to the DataSource. I also set the DataMember to the appropriate table name, but nothing is displayed in the grid view. I tried other various approaches, but nothing seems to work.

I have no problem setting this up in WinForms - it won't work in MFC. I know the data's there because I can actually step right into it from the DataGrid object (debugger) - it just won't display - the ColumnCount is still 0.

What's the problem? Has anyone else experienced this?

Conver Data Type Problem

dataminers16-Jun-06 5:17

dataminers

16-Jun-06 5:17

PlayerBalance is a String Data Type
Bet is a Int32 Data Type

I use this Conversation method
Bet = System::Int32::Parse(PlayerBalance); //Its OK

But This code not work; //error C2865: '<' : illegal comparison for handle type
if(Bet < 200)
{
MessageBox:Show("OK");
}

Best Regards...

Re: Conver Data Type Problem

2bee 16-Jun-06 6:58

2bee

16-Jun-06 6:58

Hi,

Int32 is a value class, you probably used ^ there.

Int32 Bet; // should be fine

regards Tobias

Re: Conver Data Type Problem

dataminers16-Jun-06 12:58

dataminers

16-Jun-06 12:58

SOLUTION

Bet = System::Int32::Parse(PlayerBalance); OK

if(*Bet > 5) //Must be use *
{
MessageBox::Show("OK");
}

Thank you 2bee
Best Regards....

How to Create Array of Labels on the Run-Time ?

dataminers16-Jun-06 2:34

dataminers

16-Jun-06 2:34

How to Create Array of Labels on the Run-Time ?

Best Regards...

Re: How to Create Array of Labels on the Run-Time ? [modified]

2bee 16-Jun-06 2:46

2bee

16-Jun-06 2:46

Hello,

if you mean with "Label" a System::Windows::Forms::Label control
then you could use this snippet:

// an array of 10 Labels
array<Label^> myLabelArray = gcnew array<Label^>(10);

regards Tobias

Re: How to Create Array of Labels on the Run-Time ?

dataminers16-Jun-06 3:58

dataminers

16-Jun-06 3:58

I try but error occur

error C3149: 'cli::array<type>' : cannot use this type here without a top-level '^'

Re: How to Create Array of Labels on the Run-Time ? [modified]

2bee 16-Jun-06 4:08

2bee

16-Jun-06 4:08

Sorry my fault, my thoughts were faster than my fingers:
(I forgot the '^' hat operator which classifies myLabelArray as a reference type)

array<Label^>^ myLabelArray = gcnew array<Label^>(10);

Tobias

Re: How to Create Array of Labels on the Run-Time ?

dataminers16-Jun-06 5:31

dataminers

16-Jun-06 5:31

Thanks your help.

array<label^>^ myLabelArray = gcnew array<label^>(10); //Its work But

myLabelArray[0]->Location = Point(100,100); //NOT WORK

Confused | :confused:

Re: How to Create Array of Labels on the Run-Time ? [modified]

2bee 16-Jun-06 6:50

2bee

16-Jun-06 6:50

Hi,

maybe my first statement lead you in the wrong direction.

array<Label^>^ myLabelArray = gcnew array<Label^>(10);

This line just creates an array with 10 references of the type Label.

A reference type is implicitly initialized with a nullptr, thus myLabelArray[0]->Location = Point(100,100); will not work unless you initialize it first.

// will work
lab[0] = gcnew Label();
lab[0]->Location = Point(10,10);

You should also use try-catch to catch exceptions that possibly occur.

regards Tobias

Re: How to Create Array of Labels on the Run-Time ?

dataminers16-Jun-06 13:11

dataminers

16-Jun-06 13:11

No Error Occur But I Can't See Label on the Form

array<label^>^ myLabelArray = gcnew array<label^>(10);
myLabelArray[0] = gcnew Label();
myLabelArray[0]->AutoSize = true;
myLabelArray[0]->Location = System::Drawing::Point(100, 10);
myLabelArray[0]->Name = L"lblX";
myLabelArray[0]->Size = System::Drawing::Size(63, 13);
myLabelArray[0]->Text = "HELLO";
myLabelArray[0]->TabIndex = 50;
myLabelArray[0]->Visible = true;

Sigh | :sigh:

Best Regards

Re: How to Create Array of Labels on the Run-Time ?

2bee 16-Jun-06 21:29

2bee

16-Jun-06 21:29

Hi,

you forgot to add the label to the form.

private: System::Void Form1_Load(System::Object^ sender, System::EventArgs^ e) {

array<Label^>^ myLabelArray = gcnew array<Label^>(10);
myLabelArray[0] = gcnew Label();
myLabelArray[0]->AutoSize = true;
myLabelArray[0]->Location = System::Drawing::Point(100, 10);
myLabelArray[0]->Name = L"lblX";
myLabelArray[0]->Size = System::Drawing::Size(63, 13);
myLabelArray[0]->Text = "HELLO";
myLabelArray[0]->TabIndex = 50;
myLabelArray[0]->Visible = true;

this->Controls->Add(myLabelArray[0]);

}
};

regards Tobias

Re: How to Create Array of Labels on the Run-Time ?

dataminers18-Jun-06 11:21

dataminers

18-Jun-06 11:21

It's work, thanks a lot 2bee...

Big Grin | :-D

Still Image Architecture

allenmpcx15-Jun-06 22:06

allenmpcx

15-Jun-06 22:06

I am not sure if I am posting in the right area, but I am looking for STI resources. I heard that WIA is just a wrapper for STI, however WIA 2.0 doesn't work with older Windows versions. Any C++/C/C# or other .NET supported language resources for STI is what I am seeking. Thanks a lot.

I love to program!

Re: Still Image Architecture

Jun Du16-Jun-06 8:54

Jun Du

16-Jun-06 8:54

What are STI and WIA?

- It's easier to make than to correct a mistake.

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