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If you wish to pass native pointer like void* around, use the System::IntPtr. It has the constructor for void*.
System::IntPtr intPtr((void*)pv);
Best regards,
Paul.
Jesus Christ is LOVE! Please tell somebody.
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i got a basic .cpp file i use too be able too just compile it but in .net studio the compile buttons greyed out
how do i over come this?
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Create an empty project console project and add your file to the project and compile it.
Best regards,
Paul.
Jesus Christ is LOVE! Please tell somebody.
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Hi there!
I have just started using managed c++ (until now I have always used "pure" C++), so I have a question that might sound stupid to you.
I want my class to have a string-member that descibes the class. This string is for example returned by ToString(). As a C++ I would want to make it static const to ensure it is only once in memory and cannot be altered. However, ToString() returns a non-const String. Do I have to copy the string all the time I call ToString()?
Maybe some code shows what I mean:
<br />
public __gc class Foo<br />
{<br />
public:<br />
System::String * ToString();<br />
private:<br />
static const System::String * ClassID = S"This is class Foo";<br />
};<br />
<br />
System::String * Foo::ToString()<br />
{<br />
<br />
<br />
return static_cast<System::String*>(const_cast<System::String*>(Foo::ClassID)->Clone());<br />
}<br />
Are there any other ways to avoid copying all the time?
Greetings
Andre (VizOne) Loker
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Someone already gave me the clue. MSDN says: "String Class. Represents an immutable series of characters." Stupid me! RTFM...
- Andre
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I tried to open a PE file with a program called PEExplorer .. Opend the header & discoverd that all the items in the header is correct..
but i found something strange i igot "the address of entry point" field from the header but when i checked that address i found it's so different from the contents that the PEExplorer program shows...
i found that the "image base" field is added some times 2 the address of the entry point field...
for example the address of entry point is: 0000E67Ch
& the image base is: 01000000h
but when i run the disassembler view of the PEExplorer i find that the address of the entry point is 0100E67Ch & this address can't be located coz the file size is smaller than it & the contents that the disassembler show in this location 0100E67Ch i can find it in another different place in my file
plz does any one knows how is this operation handled & how can i reach 2 the real entry point of an exe file...
my email is
blacksun_damn@yahoo.com,
ashshab_beh@yahoo.com
my best regards ... & thanx alot 4 reading
blacksun
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Hi all!
Is there an easy way (maybe I'm just blind?) to convert between unmanaged byte arrays and managed Byte arrays??
Cheers
TIA
Martin
"Situation normal - all fu***d up"
Illuminatus!
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Have you examined Marshall::Copy() method?
Best regards,
Paul.
Jesus Christ is LOVE! Please tell somebody.
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Nope! But looks interesting for one way of the conversion!
Thanks
Martin
"Situation normal - all fu***d up"
Illuminatus!
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Yes, try it. Remember to take a look at ReadByte method too. In fact the Marshall class is all you need - good luck.
Best regards,
Paul.
Jesus Christ is LOVE! Please tell somebody.
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Hello All,
What is the MC++ version of the "Optimizing Event Implementation"
described in the MSDN?
The C# version was implemented as:
-----------------------------------------------------------------
private static readonly object ClickEvent = new object();
public event EventHandler Click
{
add
{
Events.AddHandler(ClickEvent, value);
}
remove
{
Events.RemoveHandler(ClickEvent, value);
}
}
protected virtual void OnClick(EventArgs e)
{
EventHandler clickEventDelegate = (EventHandler)Events[ClickEvent];
if (clickEventDelegate != null) {
clickEventDelegate(this, e);
}
}
-----------------------------------------------------------------------
Frankly, is there no MC++ programmer on the MSDN documentation team?
Best regards,
Paul.
Jesus Christ is LOVE! Please tell somebody.
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Hello Paul,
This stuff sure is in dark, poorly-charted waters! It wasn't easy to find, but this seems to be the MC++ translation:
private:
static Object *ClickEvent = new Object();
public:
__event void add_Click(EventHandler *pEH)
{
get_Events()->AddHandler(ClickEvent, pEH);
}
__event void remove_Click(EventHandler *pEH)
{
get_Events()->RemoveHandler(ClickEvent, pEH);
}
protected:
virtual void onclick(EventArgs *e)
{
EventHandler *clickEventDelegate = (EventHandler*)( get_Events()->get_Item(ClickEvent) );
if (clickEventDelegate != null) {
clickEventDelegate(this, e);
}
}
However, I am unsure about how to properly declare ClickEvent , since I cannot find an equivalent to C#'s readonly . Most of this stuff I found in MSDN under the "Managed Extensions for C++ Specification", section "10 Events" ("ms-help://MS.VSCC/MS.MSDNVS/vcmxspec/html/vcManagedExtensionsSpec_10.htm"), and pages on __event and __delegate . MC++ is not exactly well documented!
You are one of the few people on this site who seem interested in delving deeper into MC++. Part of it is probably due to so little attention in documenting MC++ like C# is, as you mentioned. I sure hope this gets more coverage after VS.NET 2003 is released (HINT, HINT, any VS.NET team people out there)...
Cheers
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Hello Jeff,
I know you will be here
Thanks for the support. I am working on MC++ product and do not think C# could cut it.
I have posted the same to the VC.NET news group where there are so many [MSFT] figures but no one is picking the call
Jeff J wrote:
However, I am unsure about how to properly declare ClickEvent, since I cannot find an equivalent to C#'s readonly
This is my problem too. The translation as you coded seems to favor having the event as "User-defined Event Accessor methods", where the user codes the actual event accessors instead of the compiler generation (i.e. the user writes the add_, remove_, and raise_ methods).
I do not know if the raise_ method is required here and could not find any MC++ sample to confirm my thoughts.
I think I have to simply test the above and go with it.
Again, thanks for the support.
Best regards,
Paul.
Jesus Christ is LOVE! Please tell somebody.
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I'm updating some old VC++ code to .NET C++ to talk to a serial device. I cannot get the VC++ code to compile correctly under a managed C++ app. i'm new to the mc++. is this the unmanaged c++ i read about or something else im doing wrong. any help would be great.
megadith@hotmail.com
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Hi all.
Please help to me to disassemble a problem of a call Win32 of functions from unmanaged С++.
You see they are visible in the field of global names.
How to call the ::MessageBox ?
Whether it is possible basically ?
#using <mscorlib.dll>
using namespace System;
using namespace System::Runtime::InteropServices;
#include "iostream.h"
#include "stdio.h"
typedef void * HWND;
#pragma unmanaged
__nogc class UnmanagedClass {
public:
static void metod (void)
{
// ::MessageBox(0," Message_from_Win32 ", " Unmaneged_C++ ", 0);
}
};
[DllImport ("user32")]
extern "C" int MessageBoxA(HWND hWnd, String *pText, String * pCaption,unsigned int uType);
#pragma managed
void main(void)
{
printf (" Message_from_standart_C \n\r");
cout << " Message_from_standart_C++ " << endl;
Console::WriteLine (" Message_from_NET ");
MessageBoxA (0," Message_from_Win32 ", " PInvoke ", 0);
UnmanagedClass::metod();
}
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You do not need to wrap MessageBox (or any other API call) with DllImport marshaling in MC++, unless you need to make it visible to other .Net languages (or other MC++ code). Unmanaged C++ can call API stuff as usual.
However, here is a version of MessageBox I have tried successfully with both MC++ and C#:
[DllImport("user32.dll", CharSet=Auto)]
int<br />
MessageBox(IntPtr hWnd, String *pText, String *pCaption, unsigned uType);
I believe you can use HWND as you defined it within MC++, though I am not sure how other .Net classes would feel about it. An IntPtr is a managed version of void* anyway, so that's what I used. The extern "C" bit is not necessary, and might not even be allowed. I have always used DllImports within a namespace, not globally, but I have used them both within and outside of class definitions.
Cheers
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I am trying to access a simple C++ class and method from c#. My code goes something like this:
mMath.cpp:
#using <mscorlib.dll>
using namespace System::Runtime::InteropServices;
mMath::mMath(){
m_pOperator = new Operator();
}
int mMath::mAdd(int iIn1, int iIn2){
int mAns = m_pOperator->Add(iIn1, iIn2);
return mAns;
}
mMath.h:
#include "Operator.h"
using namespace System;
public __gc class mMath: public IDisposable{
Operator __nogc* m_pOperator;
public:
mMath();
~mMath();
//and an mMath dispose method
int mAdd(int i1, int i2);
};
Operator.cpp:
#include "stdafx.h"
#include <string.h>
#include "mMath.h"
#include "Operator.h"
Operator::Operator(void){}
int Operator::Add(int in1, int in2){
int ans = (in1 + in2);
return ans;
}
and Operator.h:
#pragma once
__nogc
class Operator{
public:
Operator();
int Add(int in1, int in2);
};
Created the C++ code in Visual Studio as an Extended Stored Procedure project. Compiled the C++ code into a .dll and referenced it in my C# Smart Device Application Project. When I try to run it in the emulator it won't create an instance of the mMath object:
c# code:
mMath mm = new mMath();
I get a System.TypeLoadException with message TypeLoadException.
All help will be greatly appreciated... I've tried to follow sample tutorials but I've run out of resources! Thanks!
pj
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I am not sure about what is causing your TypeLoadException, but did you try testing your classes within the same MC++ project? That is, seeing if the classes run in a plain MC++ console project without putting them into a DLL. That might provide some clues.
Incidentally, .Net destructors should be declared protected, and not public as is common in straight C++. The idea is to hide the destructor and promote calling the Dispose method, which can call the destructor if necessary. The CLR interprets a destructor as as the "Finalize" method formally used in .Net, although I doubt it's causing your problem.
Cheers
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What means for visual designing of the forms in maneged C ++ are ?
Or it can be made only by means of a code ?
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Right now, there is no GUI (visual) designer for managed C++. However, VS.Net 2003 will have one, and last I heard, is due to be released in February.
Cheers
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I read in one article that there is a integrited Crystal Report in VC.NET
is that true, if yes could anybody tell me how to use that(a simple example).
thanx.
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Hello All,
I am getting frustrated now....
How do I store cursors and retrive them from a .NET assembly dll?
The resource file support does not seems to extend to cursors. I am
building components not an application and wish to add several cursors
to the component or resource only dll.
Any help?
Best regards,
Paul.
Jesus Christ is LOVE! Please tell somebody.
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im having do an arm animation ..
with the arm consisting of say 3 basic rectangle bitmaps representing the upper arm
fore arm and the
palm..connected to each other as the usual human arm
they all move in the same plane therefore 2d is ok.
movement is to include translation as well as rotation of every arm...
this includes basically translation and rotataion of the 3 primary bitmaps as well....
as rotation of a bitmap by a specific angle is a tiresome process unless i am to use asm ....
and in this case the rotation will be a major part as for smooth rotation from 0-60 degrees say..requires me to iterate the rotation by an increment until it is 60 degrees.....
ive heard of sprites...do u suggest that i should store all the rotation sprites of all 3 arms and then blt the respective sprite based on the degree of rotation....????
i havent come across any sprite examples that dont use directx....is there any??
do advice if any other solution is possible..
Regs
fordge
note:the arm cannot be drwan geometrically and has to be a bitmap
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I am trying to build the following program as win32 console project with VS.NET which mysteriously produce no output from << operator.
It works if I use printf instead.
Can someone please point me where the problem is?
Thanks
#include <iostream.h>
class X
{
public:
void f( )
{ cout << 4; }
};
void main()
{
X p;
p.f();
}
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Sorry, HTML is not showing include statement right. Here is the correct code.
#include <iostream.h>
class X
{
public:
void f( )
{ cout << 4; }
};
void main()
{
X p;
p.f();
}
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