C / C++ / MFC

class CustomControl : public ...
{
private:
	CDC *pDC;
.
:
.
};

CustomControl::OutputLine(char *szStr)
{
	// initialise DC
	BeginOutput();
	// output is done now
	.
	:	// this function uses <code>DCHandle</code> in all the GDI calls
	.
	// terminate DC
	EndOutput();
}

CustomControl::OnPaint(LPPAINTSTRUCT lpPaint)
{
	BeginPaint(lpPaint);	// MFC call
	BeginOutput(lpPaint->hdc);	// init our DC
	.
	:
	.
	EndOutput();			// terminate our objects
	EndPaint(lpPaint);		// MFC call
}

CustomControl::BeginOutput(HDC hdc /*= NULL */)
{
	if(!DCHandle)
	{
		// attach DC
		DCHandle = new CDC;
		ASSERT(DCHandle != NULL);
		// are we supposed to get us another DC?
		if(!hdc)
			DCHandle -> Attach(GetDC() -> GetSafeHdc());
		else	// apparently not (we were given one)
			DCHandle -> Attach(hdc);
		// perform viewport inits
		// etc
		.
		:
		.
}

CustomControl::EndOutput()
{
	// protection:
	ASSERT(DCHandle != NULL);
	// release the DC
	ReleaseDC(DCHandle);
	DCHandle->Detach();

	// delete the object
	delete DCHandle;
	DCHandle = NULL;	// null it!
}

<italic>Work hard and a bit of luck is the key to success.

#include "stdafx.h"

int main(int argc, char* argv[])
{
	printf("Hello World!\n");
	char* ch=new char[100];
	return 0;
}