C++ Translation Problems (from Knowledge Base Q10533)

[Dean Wittmann]

I''ve tried attaching a zip file, but it doesn''t seem to work for me, so the code for the translated classes is at the end of this message.

After translating the 3 classes from the ImagePushButton.cs file into C++ classes, I get the following error:

error C2512: ''_12390::GridPushButtonImageCellRenderer'' : no appropriate default constructor available

which MSDN describes as:

No default constructor is available for the specified class, structure, or union. The compiler supplies a default constructor if user-defined constructors are not provided. If you provide a constructor that takes a nonvoid parameter, you must also provide a default constructor. The default constructor can be a constructor with default values for all parameters.

The following sample generates C2512:

// C2512.cpp
class B {
public:
B (char *);
/* add the folling constructor
B() {
};
*/
};

int main() {
B b; // C2512
}

--------------

I have tried to supply a default constructor with no luck on trying to get rid of this error. Can anyone see the error of my ways?

--------------

// Contents of ImagePushButton.h

#pragma once

using namespace System;
using namespace System::Collections;
using namespace System::Diagnostics;
using namespace System::Drawing;
using namespace System::Runtime::Serialization;
using namespace System::Windows::Forms;
using namespace System::IO;
using namespace System::Drawing::Imaging;

using namespace Syncfusion::Diagnostics;
using namespace Syncfusion::Windows::Forms::Grid;

namespace _12390
{
public __gc class GridPushButtonImageCellRenderer;

public __gc class GridPushButtonImageCellModel : public GridPushButtonCellModel
{
protected: GridPushButtonImageCellModel(SerializationInfo* pInfo, StreamingContext context)
: GridPushButtonCellModel(pInfo, context)
{
}

public: GridPushButtonImageCellModel(GridModel* pGrid)
: GridPushButtonCellModel(pGrid)
{
}

public: virtual GridCellRendererBase* CreateRenderer(GridControlBase* pControl)
{
return new GridPushButtonImageCellRenderer(pControl, this);
}

};

public __gc class ImageCellButton : public GridCellButton
{
private: static GridIconPaint* pIconPainter;

private: static ImageCellButton()
{
pIconPainter = new GridIconPaint("_12390", GetExecutingAssembly());
}

public: ImageCellButton(GridPushButtonCellRenderer* pControl)
: GridCellButton(pControl)
{
}

public: virtual void Draw(Graphics* pG, int iRowIndex, int iColIndex, bool bActive, GridStyleInfo* pStyle)
{
GridCellButton::Draw(pG, iRowIndex, iColIndex, bActive, pStyle);

// draw the button
bool bHovering = IsHovering(iRowIndex, iColIndex);
bool bMouseDown = IsMouseDown(iRowIndex, iColIndex);
bool bDisabled = !pStyle->Clickable;

ButtonState buttonState = ButtonState::Normal;

if (bDisabled) {
buttonState |= ButtonState::Inactive | ButtonState::Flat;
}
else if (!bHovering && !bMouseDown) {
buttonState |= ButtonState::Flat;
}

Point PtOffset = Point::Empty;

if (bMouseDown) {
PtOffset.X = 1;
PtOffset.Y = 1;
buttonState |= ButtonState::Pushed;
}

DrawButton(pG, Bounds, buttonState, pStyle);

String bitmapName = S"Browse.bmp"; // make sure this is included in project and marked as "Embedded Resource"

// Instead of using GridIconPaint you could simple use Image.Draw here
// with an existing bitmap. GridIconPaint is convenient because it lets
// us easily draw over existing background and replace the black color
// in the bitmap with a different color.

pIconPainter->PaintIcon(pG, Bounds, PtOffset, bitmapName, Color::Blue);
}
};

public __gc class GridPushButtonImageCellRenderer : public GridPushButtonCellRenderer
{
private: ImageCellButton* pPushButton;

public: GridPushButtonImageCellRenderer(GridControlBase* pGrid, GridPushButtonImageCellModel* pCellModel)
: GridPushButtonCellRenderer(pGrid, pCellModel)
{
GridPushButtonCellRenderer::RemoveButton(GridPushButtonCellRenderer::GetButton(0));
AddButton(pPushButton = new ImageCellButton(this));
}
};
}

------------------------------

// Contents of ImagePushButton.cpp

#include "ImagePushButton.h"

[Dean Wittmann]

I forgot to mention that the error line is in the function:

---------------

public: virtual GridCellRendererBase* CreateRenderer(GridControlBase* pControl)
{
return new GridPushButtonImageCellRenderer(pControl, this);
}

---------------

The "return new GridPushButtonImageCellRenderer(pControl, this);" line to be exact.

Thanks to anyone that can help me!!!

[Dean Wittmann]

Never Mind. I got it to compile correctly. Now, I''m just having problems loading the bitmap. I''m sure I''ll figure this one out too.