C / C++ / MFC

Sk Mohiuddin wrote:

I want to draw a rectangle on mouse move

// MyWnd.h (CMyWnd class):

bool fInCapture;
CPoint RubberBandPoint;
CRect RubberBandRect;
void DrawRubberBandRect();



// MyWnd.cpp

CMyWnd::CMyWnd()
{
   fInCapture = false;
}

void CMyWnd::OnLButtonDown(UINT nFlags, CPoint point)
{
	CWnd::OnLButtonDown(nFlags, point);

	SetCapture();
	fInCapture = true;
	RubberBandPoint = point;
	RubberBandRect.SetRect(point.x, point.y, point.x, point.y);
	DrawRubberBandRect();  // Draw the first rectangle
}

void CMyWnd::OnMouseMove(UINT nFlags, CPoint point)
{
	if (fInCapture)
	{
		DrawRubberBandRect();  // Erase the previous rectangle
		RubberBandRect.SetRect(RubberBandPoint.x, RubberBandPoint.y, point.x, point.y);
		DrawRubberBandRect();  // Draw the new rectangle
	}

	CWnd::OnMouseMove(nFlags, point);
}

void CMyWnd::OnLButtonUp(UINT nFlags, CPoint point)
{
	if (fInCapture)
	{
		DrawRubberBandRect();  // Erases the rectangle
		ReleaseCapture();
		fInCapture = false;
	}

	CWnd::OnLButtonUp(nFlags, point);
}

void CMyWnd::DrawRubberBandRect()
{
	CClientDC dc(this);
	int nPenWidth = 4;
	CPen DrawPen(PS_SOLID, nPenWidth, RGB(0x80,0x80,0x80));
	CPen *pOldPen = dc.SelectObject(&DrawPen);
	CGdiObject *pOldBrush = dc.SelectStockObject(NULL_BRUSH);
	int OldROPMode = dc.SetROP2(R2_XORPEN); //R2_NOTXORPEN

	dc.Rectangle(&RubberBandRect);

	dc.SetROP2(OldROPMode);
	dc.SelectObject(pOldBrush);
	dc.SelectObject(pOldPen);
}

Mark Salsbery
Microsoft MVP - Visual C++

#include <iostream>
#include <fstream>

using namespace std;

bool copyFile (const char SRC[], const char INPUT2[], const char DEST[])
{
    ifstream src; // the source file
    ifstream input2;
    ofstream dest; // the destination file
    src.open (SRC, ios::binary); // open in binary to prevent jargon at the end of the buffer
    input2.open(INPUT2, ios::binary);
    dest.open (DEST);//, std::ios::binary); // same again, binary

    if (!src.is_open() || !dest.is_open())
        return false; // could not be copied

    dest << src.rdbuf (); // copy the content
    dest << input2.rdbuf();

    dest.close (); // close destination file
    src.close (); // close source file

    return true; // file copied successfully
}

int main(int argc, char* argv[])
{
    if (!copyFile ("a.txt", "b.txt", "c.txt"))
        cout << "File could not be copied successfully";
    else
        cout << "File copied successfully!";

    cin.get (); // pause for input

    return 0;
}

std::string s = "hello";
CString str = s.c_str();

CString str = CA2T(s.c_str());