Managed C++/CLI

vikasvds wrote:

Please provide your inputs/help to help me finding other ways to optimize programming.

Shadowsoal wrote:

A C++/CLI program with a function that takes a string as an argument, writes it into every entry of an array of length 5, and returns that array to the caller.

typedef array<System::String^> StringArray;

public ref class Foo
{
public:
	StringArray^ GetStringArray(System::String^ str)
	{
		StringArray^ a = gcnew StringArray(5);
		for(int i = 0; i < 5; i++)
		{
			a[i] = str;
		}
		return a;
	}
};

int main(StringArray^ args)
{
	Foo^ foo = gcnew Foo();
	StringArray^ a = foo->GetStringArray("Test");
	for each(String^ str in a)
	{
		Console::WriteLine(str);
	}
    return 0;
}

Shadowsoal wrote:

A C# program which invokes the above program.

Shadowsoal wrote:

Certainly not a homework question

Shadowsoal wrote:

I'm not developing this specifically in Visual Studio though, I was just compiling with cl and csc. Which is why I was wondering if someone could explain how to explicitly link the two.

Shadowsoal wrote:

I suppose I just had something wrong in the C++/CLI file.

// CLIWrapper.cpp

using namespace System;

typedef array<String^> StringArray;

public ref class Foo
{
public:
    StringArray^ GetStringArray(String^ str)
    {
        StringArray^ a = gcnew StringArray(5);
        for(int i = 0; i < 5; i++)
        {
            a[i] = str;
        }
        return a;
    }
};

int main(StringArray^ args)
{
    Foo^ foo = gcnew Foo();
    StringArray^ a = foo->GetStringArray("Test");
    for each(String^ str in a)
    {
        Console::WriteLine(str);
    }
    return 0;
}

// CSTest.cs

public class CSTest
{
   public static void Main()
   {
      System.Console.WriteLine("Hello World!");
      Foo myFoo = new Foo();
      string[] myArr = myFoo.GetStringArray("Pineapple");
   }
}

$ cl CLIWrapper.cpp /clr /LD /FeCLIWrapper.dll -nologo
cl CLIWrapper.cpp /clr /LD /FeCLIWrapper.dll -nologo
CLIWrapper.cpp

$ csc CSTest.cs /r:CLIWrapper.dll -nologo
csc CSTest.cs /r:CLIWrapper.dll -nologo

$ CSTest
CSTest

Unhandled Exception: System.IO.FileNotFoundException: The specified module could not be found. (Exception from HRESULT: 0x8007007E)
   at CSTest.Main()

Shadowsoal wrote:

Unhandled Exception: System.IO.FileNotFoundException: The specified module could not be found. (Exception from HRESULT: 0x8007007E)
at CSTest.Main()

mt -manifest CLIWrapper.dll.manifest -outputresource:CSTest.exe

Shadowsoal wrote:

My simple test programs compile and run just fine now that I'm using /clr:safe instead of just /clr. Now all I need to do is write a handful of wrapper functions around my old library

    public ref class Form1 : public System::Windows::Forms::Form
    {
        unsigned char *pBitmapBits;
        Bitmap ^testBitmap;

    public:
        Form1(void)
        {
            InitializeComponent();

            // Make a 120x120 24bpp bitmap - initialize pixels to all red
            pBitmapBits = new unsigned char[120 * 120 * 3];
            for (int x = 0; x < (120*120*3); x += 3)
            {
                pBitmapBits[x+0] = 0;
                pBitmapBits[x+1] = 0;
                pBitmapBits[x+2] = 255;
            }
            testBitmap = gcnew Bitmap(120, 120, 120*3, PixelFormat::Format24bppRgb, IntPtr(pBitmapBits));
        }

...

    private: System::Void testButton_Click(System::Object^  sender, System::EventArgs^  e) 
             {
                 // Put a purple stripe across the bitmap
                for (int x = 120*3*40; x < (120*3*80); x += 3)
                {
                    pBitmapBits[x+0] = 255;
                    pBitmapBits[x+1] = 0;
                    pBitmapBits[x+2] = 255;
                }

                // Render the bitmap so we can see the results
                Graphics ^g = this->CreateGraphics();
                g->DrawImage(testBitmap, 10, 10);
             }
};

Mark Salsbery
Microsoft MVP - Visual C++