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I'm sure this is simple, i'm just not seeing it.
I'm not having any luck trying to figure out how to have my listbox autoscroll to the last item in the list when a new item is added.
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Hi,
if U are Using MFC, check setHotItem(int iIndx)
by
baijumax
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I am using Visual Studio.net 2003; and I don't see anything that looks like setHotItem.
???
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Hai,
u can simply solve the problem by selecting the last item.
ie
this->listBox1->SelectedIndex=this->listBox1->Items->Count-1;;
ANish
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I've added a new windows form to my project and I have no idea how to display the form. I have books with examples, but they only work if the form is the main form of the app. This is a mixed-mode app and I'm just doing a test to get familiar with windows forms. I have #included the header file for the form and in the menu's event handler, I have done this:
#pragma push_macro("new")
#undef new
CTestForm* dlg = new CTestForm();
dlg->ShowDialog();
#pragma pop_macro("new")
Can anyone help me out here? Thanks in advance
[insert witty comment here]
bdiamond 
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Hi,
The Following Links May Help You.
1) http://www.codeproject.com/useritems/Windows_Forms_in_MC__.asp
2)
http://www.developer.com/net/net/article.php/1378751
3)http://www.codeguru.com/columns/Kate/article.php/c6585/
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thanks!!
[insert witty comment here]
bdiamond
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..not really sure why this is in the Managed C++ forum,...but,...
I have been reading Don Box's book: "Essential COM". He has a code section in the back where he provides a server/client Chat application. It's all C++, and is written as an example of how to create a COM server/client app. It may help you (or, maybe not).
http://www.awprofessional.com/content/images/0201634465/sourcecode/COMCHAT.zip[^]
This is probably like 'cheating'.
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thanx alot for your concern!
my main problem is not the code, its trying to arrange a graphical interface for my "chat program" with borland.
i dont know how to do that and i dont know if borland 5.01 enables me to.
well, thanx alot once again, i appreciate it
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From what I've read, compiler implementations are proprietary, and can be different from vendor to vendor. This is the forum for the Microsoft Visual Studio .NET IDE. Before I used the .NET IDE, I tried messing around with the Borland compiler, and, as I recall, it works completely differently from .NET.
Most importantly, the .NET runtime environment depends on the CLR (Common Language Runtime) which is a proprietary implementation of the CLI (Common Language Infrastructure). As far as I know, the CLR is the only implementation of the CLI on Earth, and so, any code that is specific to .NET would NOT work on the Borland compiler.
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Hi all,
Hope somebody can help clear up an issue I'm experiencing trying to create an array of strings in my code. The line that is causing me all the problems is:
String* tst_str[] = {S"AA", S"BB", S"CC");
Now, when i include this in any of my main form member functions it compiles and links fine, however when I include it in a function in a separate source file (using the same namespace as my main form) I get the following linker error:
error LNK2001: unresolved external symbol "unsigned long const NSpace::$ConstGCArrayBound$0xb8408b96$1$" (?$ConstGCArrayBound$0xb8408b96$1$@NSpace@@3KB)
I have also found that I don't get this error message (even in the second source file) if I create the array first then assign each string to the appropriate position e.g:
String* tst_str = new String*[3];
tst_str[0] = S"AA";
tst_str[1] = S"BB";
tst_str[2] = S"CC";
Can anybody explain why this is happening??? I am reasonably new to this .Net programming so there is a good chance that this is something really simple that I just haven't grasped yet. As far as I can see from the reference books I have, the initial method of assigning the elements on the same line as the variable declaration is valid and will create an array of the appropriate size - but this does not appear to be what is happening?!?!
Any suggestions greatly appreciated
Gazmundo.
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Hi,
I Try To Reproduce Your Problem.But I didn' get any error.First I thought u put bracket instead of curly braces.but it gives compile error not linker error. pl's cut paste the code i mean .h and .cpp file.
by
baijumax
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The two .h and two .cpp files I created for a quick test are copied below. The main form just contains one button and one textbox - used to try and display the returned string from the 'Test' function in the other.cpp file.
Thanks
Gazmundo
Form1.cpp******************************************************
#include "stdafx.h"<br />
#include "Form1.h"<br />
#include <windows.h><br />
#include "other.h"<br />
<br />
using namespace arrtest;<br />
<br />
int APIENTRY _tWinMain(HINSTANCE hInstance,<br />
HINSTANCE hPrevInstance,<br />
LPTSTR lpCmdLine,<br />
int nCmdShow)<br />
{<br />
System::Threading::Thread::CurrentThread->ApartmentState = System::Threading::ApartmentState::STA;<br />
Application::Run(new Form1());<br />
return 0;<br />
}<br />
<br />
System::Void Form1::button1_Click(System::Object * sender, System::EventArgs * e)<br />
{<br />
String* tmp;<br />
tmp = Test(counter);<br />
textBox1->Text = tmp;<br />
counter++;<br />
if(counter>2)<br />
{<br />
counter =0;<br />
}<br />
}
***************************************************************
Form1.h********************************************************
#pragma once<br />
<br />
<br />
namespace arrtest<br />
{<br />
using namespace System;<br />
using namespace System::ComponentModel;<br />
using namespace System::Collections;<br />
using namespace System::Windows::Forms;<br />
using namespace System::Data;<br />
using namespace System::Drawing;<br />
<br />
public __gc class Form1 : public System::Windows::Forms::Form<br />
{ <br />
public:<br />
Form1(void)<br />
{<br />
InitializeComponent();<br />
counter=0;<br />
}<br />
Int32 counter;<br />
<br />
protected:<br />
void Dispose(Boolean disposing)<br />
{<br />
if (disposing && components)<br />
{<br />
components->Dispose();<br />
}<br />
__super::Dispose(disposing);<br />
}<br />
private: System::Windows::Forms::TextBox * textBox1;<br />
private: System::Windows::Forms::Button * button1;<br />
<br />
private:<br />
System::ComponentModel::Container * components;<br />
<br />
void InitializeComponent(void)<br />
{<br />
this->textBox1 = new System::Windows::Forms::TextBox();<br />
this->button1 = new System::Windows::Forms::Button();<br />
this->SuspendLayout();<br />
this->textBox1->Location = System::Drawing::Point(96, 168);<br />
this->textBox1->Name = S"textBox1";<br />
this->textBox1->TabIndex = 0;<br />
this->textBox1->Text = S"textBox1";<br />
this->button1->Location = System::Drawing::Point(128, 72);<br />
this->button1->Name = S"button1";<br />
this->button1->TabIndex = 1;<br />
this->button1->Text = S"button1";<br />
this->button1->Click += new System::EventHandler(this, button1_Click);<br />
this->AutoScaleBaseSize = System::Drawing::Size(5, 13);<br />
this->ClientSize = System::Drawing::Size(292, 273);<br />
this->Controls->Add(this->button1);<br />
this->Controls->Add(this->textBox1);<br />
this->Name = S"Form1";<br />
this->Text = S"Form1";<br />
this->ResumeLayout(false);<br />
<br />
} <br />
private: System::Void button1_Click(System::Object * sender, System::EventArgs * e);<br />
<br />
};<br />
}
***************************************************************
other.cpp******************************************************
#include "stdafx.h"<br />
#include "other.h"<br />
<br />
using namespace arrtest;<br />
using namespace System;<br />
<br />
System::String * arrtest::Test(Int32 value)<br />
{<br />
String* fast_segments[] = {S"AA", S"BB", S"CC"};
return (fast_segments[value]);<br />
}
***************************************************************
other.h********************************************************
#pragma once<br />
<br />
namespace arrtest<br />
{<br />
using namespace System;<br />
System::String * Test(Int32 value);<br />
<br />
}
***************************************************************
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Hi,
i Checked U R Test.cpp And Test.h files still i didn't get u r problem.but i wrote code for u check it out that may help u.
------------------Main App Code----------------
#include "stdafx.h"
#using <mscorlib.dll>
#include <tchar.h>
#include "TestString.h"
using namespace System;
// This is the entry point for this application
int _tmain(void)
{
CTestString obj; //Test Object
Console::WriteLine( obj.fast_Segments(0));
Console::ReadLine();
return 0;
}
----I wrote class CTestString .
----------------------------------TestString.h------------------------
#pragma once
#using <mscorlib.dll>
using namespace System;
class CTestString
{
public:
CTestString(void);
~CTestString(void);
String* fast_Segments(Int32 nKey);
};
---------------------------------------TestString.cpp---------------------------
#include "StdAfx.h"
#include "teststring.h"
CTestString::CTestString(void)
{
}
CTestString::~CTestString(void)
{
}
String* CTestString::fast_Segments(Int32 nKey)
{
String* ts_str[] = {S"AA",S"BB",S"CC"} ;
return ts_str[nKey];
}
by
baijumax
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I'm attempting to write a managed wrapper interface to a native C++ class such that I can access it from within my C# code.
I'm using Visual Studio .NET 2003 on Windows 2000.
I started a new solution: Visual C++ Projects > Class Library (.NET)
My Stdafx.h file has the following in it:
#pragma once
#define WIN32_LEAN_AND_MEAN
#include
#include
using std::cout; using std::endl;
In the Solution Explorer, under Source Files I have the following:
1. AssemblyInfo.cpp
2. BiquadCode.cpp (native C++ code)
3. DSPWrap.cpp (the wrapper code)
4. Stdafx.cpp
Under Header Files, I have:
1. BiquadCode.h
2. DSPWrap.h
3. resource.h
4. Stdafx.h
I've "included" the Stdafx.h file in the first statement of DSPWrap.cpp.
On a build attempt, the code generated a C1010 error. For the files BiquadCode.cpp and BiquadCode.h, I've now set the precompiled header option as "Not using precompiled headers".
However, this throws a C1034 error
\DSPWrap\DSPWrap\Stdafx.h(9): fatal error C1034: windows.h: no include path set
My questions are as follows:
1. How do I get this code to compile?
2. Where exactly do I need to "include" the Stdafx.h file? Do I need to do it only once in the wrapper code file?
Thanks in advance!
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Does anyone know how to determine at runtime the number of permissible values which an enum variable can assume?
Sparky
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In Managed C++, you can use the static method on the Enum namespace which will give you an array of all the possible values. Just get the count of those values.
Christian
I have drunk the cool-aid and found it wan and bitter. - Chris Maunder
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I need to wrap a native class for using it in C#
the class contain CString objects.
in old MC++ ver 2003 i write somthing like :
__property String * get_ImageName ()
{
return mBillPopJobParameters-> m_ImageName ;
}
__property void set_ImageName (String * pValue )
{
mBillPopJobParameters-> m_ImageName = pValue;
}
(m_ImageName is a CString.)
and it work ok.
when i try to use it in C++/CLI
property String^ ImageName
{
String^ get()
{
return mPrintSetParameters->m_ImageName ;
}
void set(String^ pValue)
{
mPrintSetParameters-> m_ImageName = pValue;
}
}
i get error that it can not convert from CString to String
any one know how to it right ?
Thanks.
Avraham Cohen.
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Hi,
try This
if u R Accepts System::String _gc*
then (LPCTSTR) YourCString
by
baijumax
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Hello
I am coding an application I do have problem to work with one ActiveX COM. I do not know how to convert
System::String * form structure or char and pass to property (set_Value())function with argument which is type of System::Object _gc * _gc *.
When I call this function in VB.NET works fine and I do not need to do anything to conver string.
Does anybody can help???
Tnx
Mirdous
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Hi,
try this
System::String str1 = _gc new String();
by
baijumax
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I am having problems writing an opc client using managed c++. I using an opcdotnetautomation.dll. When I go to read in a value from the OPC server. I am getting a signature I don't understand for the OPCItem Read method. Thank you in advance for assistance.
myServer = new OPCServerClass();
myServer->Connect(S"KEPware.KEPServerEx.V4",S"machineName");
myGroups = static_cast< OPCGroupsClass *> ( Marshal::CreateWrapperOfType( myServer->OPCGroups, __typeof( OPCGroupsClass ) ) );
vendor_textBox->Text = myServer->VendorInfo;
start_time_textBox->Text = myServer->StartTime.ToString();
current_time_textBox->Text = myServer->CurrentTime.ToString();
Updated_textbox->Text = myServer->LastUpdateTime.ToString();
groups_textBox->Text = myGroups->Count.ToString();
Server_textBox->Text = myServer->ServerName;
major_textBox->Text = myServer->MajorVersion.ToString();
minor_textBox->Text = myServer->MinorVersion.ToString();
build_textBox->Text = myServer->BuildNumber.ToString();
GroupA = myGroups->Add(S"GroupA");
//GroupB = myGroups->Add(S"GroupB");
AItems = GroupA->OPCItems;
item1 = AItems->AddItem(S"Channel_0_User_Defined.Sine.Sine1",1);
item2 = AItems->AddItem(S"Channel_0_User_Defined.Sine.Sine2",1);
item1->Read(OPCDataSource::OPCCache,?,?,?);
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I'm still a rookie, so forgive me if this is simple.
I have a form and in the form's .h file i have the form's regular class stuff, but I have also added another class.
For example:
in my .h file i have something like this:
namespace MyNamespace
{
public __gc class Form1 : public System::Windows::Forms::Form
{
//then i have all of the regular form stuff
//I also have an event handler that is
//like this:
private: System::Void axTws1_tickPrice(System::Object * sender, AxInterop::TWSLib::_DTwsEvents_tickPriceEvent * e)
{
//when this event happens I want to create an
//instance of another class that I have defined
//within this same .h file, which you can see
//below.
//now when i try to do the following, i get an
//error message that states that
//"SymbolObject_Constructor" is an undeclared
//identifier:
SymbolObject_Constructor *tempObject = new SymbolObject_Constructor;
}//end of event handler
};//end of form class
public __gc class SymbolObject_Constructor
{
public: String *Stock_Ticker;
Decimal Bid;
Decimal Ask;
public: SymbolObject_Constructor()
{
Stock_Ticker = S"";
Bid = 0.0;
Ask = 0.0;
}
};//end of SymbolObject class
}//end of namespace
in my .cpp file for this form, i have a void method that creates an instance of the SymbolObject class, and I do it the same way as I attempted in the .h file; but in the .cpp file, I don't get the error message.
Can anyone see what I am doing wrong?
Thanks,
Jody Blau
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Hai
Nothing wrong in ur code.
i also don't know why it happened.
But placing your second class before the Form1 calss will solve the problem.
ie define all your classes before it uses
by
Anisg
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