How do you resize an image in managed C++ .net using GDI or GDI?

Hello.

I'm trying to create a simple program that amongst other things creates a
thumbnail of an image (Bitmap) to a set size determined by the user in
pixels?
The problem is: All of the examples I have seen so far are in c#.
Can anyone please provide reference to a c++ managed version.

Thanks.
John

--
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"John Swan" <j.a.swan123@ntlworld.com> schrieb:
> I'm trying to create a simple program that amongst other things creates a
> thumbnail of an image (Bitmap) to a set size determined by the user in
> pixels?
> The problem is: All of the examples I have seen so far are in c#.
> Can anyone please provide reference to a c++ managed version.

C++/CLI sample (requires a reference to "System.Drawing.dll"):

\\\
using namespace System;
using namespace System:rawing;
using namespace System:rawing:rawing2D;
using namespace System:rawing::Imaging;

int main(array<System::String ^> ^args)
{
Bitmap ^bmp1 = gcnew Bitmap(L"C:\\WINDOWS\\Angler.bmp");
Bitmap ^bmp2 = gcnew Bitmap(
(int)(bmp1->Width * 0.1),
(int)(bmp1->Height * 0.1),
PixelFormat::Format24bppRgb
);
Graphics ^g = Graphics::FromImage(bmp2);
g->InterpolationMode = InterpolationMode::HighQualityBicubic;
g->DrawImage(bmp1, 0, 0, bmp2->Width, bmp2->Height);
bmp2->Save(L"C:\\Test.bmp");
return 0;
}
///

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

Thanks for the speedy reply.

I dont actually wish to draw the image.
I would like this too be a batch process and it would therefore be
considerably quicker in no drawing is done.
Any help would be appreciated.


"Herfried K. Wagner [MVP]" <hirf-spam-me-here@gmx.at> wrote in message
news:eZnuvc0$FHA.316@TK2MSFTNGP10.phx.gbl...
> "John Swan" <j.a.swan123@ntlworld.com> schrieb:
> > I'm trying to create a simple program that amongst other things creates
a
> > thumbnail of an image (Bitmap) to a set size determined by the user in
> > pixels?
> > The problem is: All of the examples I have seen so far are in c#.
> > Can anyone please provide reference to a c++ managed version.
>
> C++/CLI sample (requires a reference to "System.Drawing.dll"):
>
> \\\
> using namespace System;
> using namespace System:rawing;
> using namespace System:rawing:rawing2D;
> using namespace System:rawing::Imaging;
>
> int main(array<System::String ^> ^args)
> {
> Bitmap ^bmp1 = gcnew Bitmap(L"C:\\WINDOWS\\Angler.bmp");
> Bitmap ^bmp2 = gcnew Bitmap(
> (int)(bmp1->Width * 0.1),
> (int)(bmp1->Height * 0.1),
> PixelFormat::Format24bppRgb
> );
> Graphics ^g = Graphics::FromImage(bmp2);
> g->InterpolationMode = InterpolationMode::HighQualityBicubic;
> g->DrawImage(bmp1, 0, 0, bmp2->Width, bmp2->Height);
> bmp2->Save(L"C:\\Test.bmp");
> return 0;
> }
> ///
>
> --
> M S Herfried K. Wagner
> M V P <URL:http://dotnet.mvps.org/>
> V B <URL:http://classicvb.org/petition/>

"John Swan" <j.a.swan123@ntlworld.com> schrieb:
> I dont actually wish to draw the image.
> I would like this too be a batch process and it would therefore be
> considerably quicker in no drawing is done.

That's exactly what the sample is doing. The code can be used in a console
application. 'DrawImage' is used to draw the resized version of the image
onto another bitmap which will be persisted by calling its 'Save' method
later on.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

Oh. Fair enough.

Thanks. You learn something new everyday.
Cheers

John

"Herfried K. Wagner [MVP]" <hirf-spam-me-here@gmx.at> wrote in message
news:eMxh372$FHA.2696@TK2MSFTNGP09.phx.gbl...
> "John Swan" <j.a.swan123@ntlworld.com> schrieb:
> > I dont actually wish to draw the image.
> > I would like this too be a batch process and it would therefore be
> > considerably quicker in no drawing is done.
>
> That's exactly what the sample is doing. The code can be used in a
console
> application. 'DrawImage' is used to draw the resized version of the image
> onto another bitmap which will be persisted by calling its 'Save' method
> later on.
>
> --
> M S Herfried K. Wagner
> M V P <URL:http://dotnet.mvps.org/>
> V B <URL:http://classicvb.org/petition/>
>