Question

How to use WndProc Funection for a picturebox in my form ?
i try it like this code but it not work and not any message send to my
public: virtual void WndProc( Message% m )

using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
namespace MyProject {
    public ref class Form1 : public System::Windows::Forms::Form
    {
    public:
        Form1(void) {
            InitializeComponent();
            //TODO: Add the constructor code here
        }
    protected:
        ~Form1() {
            if (components)
                delete components;
        }
    private:
        System::Windows::Forms::PictureBox^  pictureBox1;
        System::ComponentModel::Container ^components;

        void InitializeComponent(void) {
            this->pictureBox1 = gcnew System::Windows::Forms::PictureBox();
            (cli::safe_cast<System::ComponentModel::ISupportInitialize^>(
                this->pictureBox1))->BeginInit();
            this->SuspendLayout();
            // 
            // pictureBox1
            // 
            this->pictureBox1->Location = System::Drawing::Point(41, 27);
            this->pictureBox1->Name = L"pictureBox1";
            this->pictureBox1->Size = System::Drawing::Size(206, 203);
            this->pictureBox1->TabIndex = 0;
            this->pictureBox1->TabStop = false;
            // 
            // Form1
            // 
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(292, 265);
            this->Controls->Add(this->pictureBox1);
            this->Name = L"Form1";
            this->Text = L"Form1";
            (cli::safe_cast<System::ComponentModel::ISupportInitialize^>(
                this->pictureBox1))->EndInit();
            this->ResumeLayout(false);
        }
    };

    ref class pictureBox1 : PictureBox {
    public:
        virtual void WndProc( Message% m ) override {
            __super::WndProc(m);
        }
    };
}//close NameSpace

Answer 1

The answer provided by SLaks is correct, and I agree 100% with his comments that you need to understand what the code means, rather than copying and pasting a magical snippet off Stack Overflow.

But I see you’re still screaming about how you should write the code to use your custom PictureBox class (the one on which you overrode the WndProc function), rather than the built-in one. That’s really a simple matter of changing all of the references to System::Windows::Forms::PictureBox to pictureBox1 (your custom class). Of course, you’ll need to change the name of one or the other, but I recommend choosing better names than the default for everything.

For example, try the following:

namespace MyProject {

    using namespace System;
    using namespace System::ComponentModel;
    using namespace System::Collections;
    using namespace System::Windows::Forms;
    using namespace System::Data;
    using namespace System::Drawing;


    public ref class Form1 : public System::Windows::Forms::Form
    {
    public:
        Form1(void)
        {
            InitializeComponent();
            //
            //TODO: Add the constructor code here
            //
        }

    protected:

        ~Form1()
        {
            if (components)
            {
                delete components;
            }
        }
    private: pictureBox1^ myPictureBox;
    protected: 

    private:

        System::ComponentModel::Container ^components;


        void InitializeComponent(void)
        {
            this->myPictureBox = (gcnew pictureBox1());
            (cli::safe_cast<System::ComponentModel::ISupportInitialize^  >(this->myPictureBox))->BeginInit();
            this->SuspendLayout();
            // 
            // myPictureBox
            // 
            this->myPictureBox->Location = System::Drawing::Point(41, 27);
            this->myPictureBox->Name = L"myPictureBox";
            this->myPictureBox->Size = System::Drawing::Size(206, 203);
            this->myPictureBox->TabIndex = 0;
            this->myPictureBox->TabStop = false;
            // 
            // Form1
            // 
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(292, 265);
            this->Controls->Add(this->myPictureBox);
            this->Name = L"Form1";
            this->Text = L"Form1";
            (cli::safe_cast<System::ComponentModel::ISupportInitialize^>(this->myPictureBox))->EndInit();
            this->ResumeLayout(false);

        }

    };




ref class pictureBox1  : PictureBox  {
    //protected:
    public:      
        virtual void WndProc( Message% m ) override {
                        __super::WndProc(m);
        }
    };




}//close NameSpace