C / C++ / MFC

double fGammaInverse = 1.0 / gamma;
for each pixel
  for each color component
    pixVal = (BYTE) (256 * pow ((double)pixVal / 256.0, fGammaInverse));

seefer wrote:

Is there a way to draw to a GDI/GDI+ suface using hardware accelerated DirectX calls?

ostringstream ss;
ss << "The number is " << 42;
string s = ss.str();

ostringstream ss;
ss << picno;
string s = ss.str();

sunita ramesh wrote:

How to convert int to string ,string to int in vc++.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

<br />
int x=12345;<br />
CString s;         // s = "" (empty string)<br />
s.Format("%d", x); // s = "12345" as string<br />

<br />
int x=0;<br />
CString s="12345";<br />
x = atoi(s);       // x= 12345 as integer<br />

_bstr_t bstr(*text);<br />
AfxMessageBox(bstr);

_bstr_t bstr(*text);<br />
bstr += _bstr_t(" appened string here");<br />
AfxMessageBox(bstr);

Dihirk wrote:

convert that bstr into a character string?

CBaseClass
{
};

CChildClass : public CBaseClass
{
};

CBaseClass* pNewClass = new CChildClass;
// Do stuff

class Base
{
public:
	virtual void Message() const = 0;
};
 
class Derived1
{
public:
	virtual void Message() const
	{
		cout << "Hello from Derived1" << endl;
	}
};
 
class Derived2
{
public:
	virtual void Message() const
	{
		cout << "Hello from Derived2" << endl;
	}
};
 
void PrintMessage(const Base &b)
{
	b.Message();
}
 
void Driver()
{
	CDerived1 d1;
	CDerived2 d2;

	PrintMessage(d1);
	PrintMessage(d2);
}