Question

I have loaded an Image by CLI/C++ and i would like to display it in the form(there is Form1 turning on when running program, how to put it there). I have commented which image I would like to put in the form

// a.cpp : main project file.

#include "stdafx.h"
#include "Form1.h"
#using <mscorlib.dll> //requires CLI
using namespace System;
using namespace System::IO;
using namespace System::Windows::Media::Imaging;
using namespace System::Windows::Media;
using namespace System::Windows::Controls;
using namespace a;

[STAThreadAttribute]
int main(array<System::String ^> ^args)
{
    // Enabling Windows XP visual effects before any controls are created
    Application::EnableVisualStyles();
    Application::SetCompatibleTextRenderingDefault(false); 

    // Create the main window and run it
    Application::Run(gcnew Form1());


    // Open a Stream and decode a JPEG image
        Stream^ imageStreamSource = gcnew FileStream("C:/heart.jpg", FileMode::Open, FileAccess::Read, FileShare::Read);

        JpegBitmapDecoder^ decoder = gcnew JpegBitmapDecoder(imageStreamSource, BitmapCreateOptions::PreservePixelFormat, BitmapCacheOption::Default);
        BitmapSource^ bitmapSource = decoder->Frames[0];//< --mamy bitmape
        // Draw the Image
        System::Windows::Controls::Image^ myImage = gcnew System::Windows::Controls::Image();  //<--- this image in the Form1  -------
        myImage->Source = bitmapSource;
        myImage->Stretch = Stretch::None;
        int width = 128;
        int height = width;
        int stride = width / 8;
        array<System::Byte>^ pixels = gcnew array<System::Byte>(height * stride);

        // Define the image paletteo
        BitmapPalette^ myPalette = BitmapPalettes::Halftone256;

        // Creates a new empty image with the pre-defined palette.
        BitmapSource^ image = BitmapSource::Create(
           width, height,
           96, 96,
           PixelFormats::Indexed1,
           myPalette,
           pixels,
           stride);

        System::IO::FileStream^ stream = gcnew System::IO::FileStream("new.jpg", FileMode::Create);
        JpegBitmapEncoder^ encoder = gcnew JpegBitmapEncoder();
        TextBlock^ myTextBlock = gcnew System::Windows::Controls::TextBlock();
        myTextBlock->Text = "Codec Author is: " + encoder->CodecInfo->Author->ToString();
        encoder->FlipHorizontal = true;
        encoder->FlipVertical = false;
        encoder->QualityLevel = 30;
        encoder->Rotation = Rotation::Rotate90;
        encoder->Frames->Add(BitmapFrame::Create(image));
        encoder->Save(stream);
    return 0;
}

Answer 1

The .NET Graphics class (GDI+) is great for, well, drawing graphics. You can use it to draw not just images to a canvas, but many other things. Just google something like ‘GDI+ tutorials’ or ‘.NET Graphics’, and you’ll find something.

Also, the way you loaded that JPEG, there are much easier ways to do that in .NET