need help about WM_MOUSEMOVE

OpenGL OpenGL: Basic Coding
1

Can anybody tell me how do i get difference of current and the previous position of the wheel.
From the msdn I have checked and found GET_WHEEL_DELTA_WPARAM Macro but i can’t use it.
Compiler says “GET_WHEEL_DELTA_WPARAM : undeclared identifier”
I also included windows.h and i am sure that
case WM_MOUSEMOVE: works well.
What i am trying to do is to set the A value in
gluPerspective(A,(GLfloat)width/(GLfloat)height,0.1f,100.0f);
function. I am trying to zoom in - out by changing A value. Am I on the right way…
Thanx

2

Hm, personally when i’m sure that the header is included and that normally works I suspect a mistakes in declaration, I suppose that your source is to big to be posted…?

3

This is my wndproc function and problem here is
GET_WHEEL_DELTA_WPARAM(wParam); doesn’t work
in case WM_MOUSEWHEEL

LRESULT CALLBACK WndProc( HWND hWnd, // Handle For This Window
UINT uMsg, // Message For This Window
WPARAM wParam, // Additional Message Information
LPARAM lParam) // Additional Message Information
{
switch (uMsg) // Check For Windows Messages
{
case WM_ACTIVATE: // Watch For Window Activate Message
{
if (!HIWORD(wParam)) // Check Minimization State
{
active=TRUE; // Program Is Active
}
else
{
active=FALSE; // Program Is No Longer Active
}

		return 0;								// Return To The Message Loop
	}

	case WM_SYSCOMMAND:							// Intercept System Commands
	{
		switch (wParam)							// Check System Calls
		{
			case SC_SCREENSAVE:					// Screensaver Trying To Start?
			case SC_MONITORPOWER:				// Monitor Trying To Enter Powersave?
			return 0;							// Prevent From Happening
		}
		break;									// Exit
	}

	case WM_CLOSE:								// Did We Receive A Close Message?
	{
		PostQuitMessage(0);						// Send A Quit Message
		return 0;								// Jump Back
	}

	case WM_KEYDOWN:
		//Keyboard_Input();	
	  switch(wParam) 
	  {		  
		case VK_ESCAPE:
			PostQuitMessage(0);						
			break;
	  }
	  break;

	case WM_KEYUP:								// Has A Key Been Released?
	{
		keys[wParam] = FALSE;					// If So, Mark It As FALSE
		return 0;								// Jump Back
	}

	case WM_SIZE:								// Resize The OpenGL Window
	{
		ReSizeGLScene(LOWORD(lParam),HIWORD(lParam));  // LoWord=Width, HiWord=Height
		return 0;								// Jump Back
	}
	
	case WM_MOUSEMOVE:								// Mouse Move
	{
	//	int xPos = GET_X_LPARAM(lParam); 
	//	int yPos = GET_Y_LPARAM(lParam); 
		objCamera.Mouse_Move(640, 480);	
		return 0;								// Jump Back
	}
	case WM_MOUSEWHEEL:
	{
	short zDelta = GET_WHEEL_DELTA_WPARAM(wParam);
	
		return 0;	
	} 



}


// Pass All Unhandled Messages To DefWindowProc


return DefWindowProc(hWnd,uMsg,wParam,lParam);

}

4

not to sound like a jerk, but doesn’t this belong in the windows-specific thread maybe?

5

yes it can be

6

I found what i am asking
I wrote
short zDelta = (wParam / 65536);
in case WM_MOUSEWHEEL
so i get zDelta as 120 positive or negative according to wheel rotation.