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I am using visual c++ 6.0. I wish to use the COleVariant::GetByteArrayFromVariantArray member function
but the compiler generates error message : GetByteArrayFromVariantArray is not a member function of COleVariant. Why could this happen?? Is this function available only in VC++ 2005??
Is there any way to retrieve a byte array from variant array??
Thanks. I will appreciate any help from you.
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weehau wrote: I am using visual c++ 6.0
Then you're plainly not using C++/CLI. Try the Visual C++ forum.
Christian Graus - C++ MVP
'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert
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I am trying to write an app which requires me to convert a String^ to a WCHAR but not having much luck with a resolution.
Can anyone point out where I am going wrong ?
I'm using Visual Studio 2005 and it's a console application.
Pete
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Fritzables wrote: Can anyone point out where I am going wrong ?
Just a guess but you are not using the documentation, examples and samples found on msdn.microsoft.com.
led mike
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G'Day led mike,
Well, ya could be right despite the fact I have tried a number of times creating different search strings in the hope I may find something that steers me in the right direction.
I am pretty new to C++ as I have recently come across from using Borland's Delphi, so I will use that as my excuse. 
Pete
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Fritzables wrote: despite the fact I have tried a number of times creating different search strings
That is easy to believe. Keep at it though. Developing the "skill" to find information is a critical skill in our field. If this helps at all, I use Google to do my searching and when I expect that MSDN will contain the information I seek I put "MSDN" as the first keyword in the Google search phrase. I find that Google provides much better results than the MSDN search engine. But that's just me. 
Anyway using your question as an example my Google search string would be
MSDN System.String convert WCHAR
Try it out.
led mike
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I hope this example helps:
#include <iostream>
using namespace System;
using namespace System::Runtime::InteropServices;
int main(array<System::String ^> ^args)
{
String ^gcString = L"Hello, World!";
IntPtr intptr = IntPtr::Zero;
try
{
intptr = Marshal::StringToHGlobalUni(gcString);
const wchar_t *hgString =
static_cast<const wchar_t*>(intptr.ToPointer());
std::wcout << hgString << std::endl;
}
catch (Exception ^e)
{
Console::WriteLine(e->Message);
}
finally
{
if (intptr != IntPtr::Zero)
{
Marshal::FreeHGlobal(intptr);
}
}
return 0;
}
-- modified at 19:20 Wednesday 29th November, 2006
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I use this easy way, but it is not recommended for large strings.
String ^s = "Hello world";<br />
CString str = s;<br />
WCHAR *w = str.GetBuffer();<br />
WCHAR *myChar = new WCHAR[str.GetLength() +1];<br />
memcpy(myChar,w,str.GetLength()*sizeof(WCHAR));<br />
myChar[str.GetLength()] = '\0';<br />
<br />
AfxMessageBox(myChar);
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Thanks all for the help on this one - much appreciated.
Fritzables.
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Can anyone tell me the difference between Storage Class and Storage Class Specifier?
Thanks and Regards
Kenny
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In C++, the storage class specifiers auto, static, register, extern, and mutable. The storage class specifiers explicitly determine the storage class of a variable. Thus, the storage class specifier, auto, lets you define a variable with automatic storage (storage class). However, you will also hear: auto storage class. So, storage class and storage class specifier may be used to mean the same thing.
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i need creating a database myself,i need make a database from scratch , can u give me some help please?
ert
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According to your profile, you program with C++ and not C++/CLI. Also, your plea for help does not give me enough information to assist you. What are your requirements? Here is an example of how your plea for help sounds to me:
I need to create a vehicle from scratch? Can you help me?
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George L. Jackson wrote: Here is an example of how your plea for help sounds to me:
I need to create a vehicle from scratch? Can you help me?
Some people have a memory and an attention span, you should try them out one day. - Jeremy Falcon
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There is a c++ application developed in Windows Platform. Now I want to
port this application in to Linux (Red Hat - Fedora Core). Is there any tool for converting it or can anyone suggest the way to convert it. I am totaly new to Linux and doesn't famliar with compiling multiple sourc files. Actually there is around(180 Files - including headers and cpp files), its a project and i want to convert it. can anyone help me in this.......
Thanking you....
Syamkumar.P.J
syamkumar.
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I think you are in the wrong forum...
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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You might be able to run it with wine program in Linux. Your better bet would be to ask in a Linux forum
Some people have a memory and an attention span, you should try them out one day. - Jeremy Falcon
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Hi ,
My problem is that, I want to run an .exe from the windows service. But the application window is not visible to the user. Exe and Service is running in task manager. Previously I was using CreateProcess funtion. Then after getting suggestion from this site, I changed that into CreateProcessAsUser and the Code is like below. But Still I am facing same problem.
BOOL b;
HANDLE hToken;
HANDLE hNewToken;
b = OpenProcessToken(GetCurrentProcess(), TOKEN_ASSIGN_PRIMARY|TOKEN_DUPLICATE, &hToken);
b = DuplicateTokenEx(hToken, TOKEN_ASSIGN_PRIMARY|TOKEN_ALL_ACCESS, NULL, SecurityImpersonation, TokenPrimary, &hNewToken);
b = CreateProcessAsUser(hNewToken, NULL,ArgPBU,NULL, NULL, FALSE, NORMAL_PRIORITY_CLASS | CREATE_NEW_CONSOLE, NULL, Cwd, &si, &m_piPBU);
CloseHandle(hNewToken);
-------------
After executing this I am getting same result.
Rgds.,
N.Surendran
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Does your service have a main or a WinMain entry point? Also, you should post this in the Viaual C++/MFC forum.
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i'm new in C++ but i'm a Borland C++ user, is that same with C++/CLI ?
Can anyone help me make bouncing ball with the Borland C++ program ?
i beg all the readers
thanks before
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Borland C++ is not managed. C++/CLI is managed. Thus, you are in the wrong forum. Also, you may have better luck asking your question at a Borland C++ message board.
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Hello,
I am trying to do a GetPixel in a image embebed in a PictureBox.
If I have a Bitmap it is posible to do a GetPixel, to get the COLORREF of the pixel clicked, but in a PictureBox I can't do it.
Does anybody knows how to get the color of a pixel clicked in a picturebox?
Thanks in advance
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A picture box is NOT a picture. It DOES have a property that exposes the bitmap it's displaying. I presume you can call a getpixel method on that.
Christian Graus - C++ MVP
'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert
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Ok, now I see,
I have done it as follows:
I load the image in the picturebox:
pictureBox->Load("C:\\image.png");
and after I load it like a bitmap in the event that I want, in my case pictureBox_MouseUp
<br />
Point^ Point1;<br />
Bitmap^ Bitmap1;<br />
Color pixelColor;<br />
<br />
Point = e->Location::get()<br />
Bitmap1= gcnew Bitmap( "C:\\image.png",true );<br />
pixelColor = Bitmap1->GetPixel(Point1->X,Point1->Y);
This is the way that I did it,
Thanks for your help
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I'm not sure how this is a C++/CLI question ?
Christian Graus - C++ MVP
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