Homework Title No

8/3/2019 Homework Title No

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Homework title no. : -1 Course code:-CAP625T

Course instructor: - Miss.Nisha Rani Course tutor:-NA

D.of.allocation:-22/1/12 D.of.submission:12/1/12

Roll no.:- Section:

Declaration:-

I declare that this assignment is my individual work. I have not copied

from any other student work or from any other source expect where due

acknowledgement is made explicitly in the text nor has any part being

written for me by another person.

Signature

Comments:-________________________________________________

Marks obtained:-___________________________________________

Q1. Windows allows the user to switch between application. How?

Ans

Context Switching

So, a program runs and calls API functions. How do other programs get a

chance to run, then? Most of the time, programs simply allow the

operating system to switch to another program because they are waiting

for something (human input, hard disk). The kernel then performs context

switching to allow another program to run. This is done by:

1. Saving the current program's state (including registers),

2. Figuring out which program to run next,

3. and restoring a different program's state.

If a program (or thread to be more accurate) runs for more than a certain

period of time (the thread quantum), the operating system will context

switch to another program. This idea is called preemption.



Q2. Windows program code consists of static and dynamic data. Take any

example to show how window program carries static data. Give the

suitable coding example.

Ans

Static data example:-

#include<windows.h>>

Long FAR PASCAL Windproof (HWND, UINT, WPARAM,

LPARAM); /*one word and long data passed with the message */

into PASCAL Win Main(HANDLE hInstance,HANDLE

hPrevInstance,LPSTR lpszCmdLine,int nCmdShow)

{

HWND hWnd;

MSG msg; /*message structure*/ WNDCLASS wndclass; /*window class structure*/

if(!hPrevInstance)

{

wndclass.style =CS_HREDRAW| CS_VREDRAW; /*redraw

window if horizontal or vertical size(1) changes*/

wndclass.lpfnWndProc =WndProc;

wndclass.cbClsExtra=0;

wndclass.cbWndExtra=0;

wndclass.hInstance=hInstance;

wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);

/*loads the idi_app icon*/

wndclass.hCursor=LoadCursor(NULL,IDC_ARROW); /*loads the

standard arrow cursor shpe*/

wndclass.hbrBackground=GetStockObject(WHITE_BRUSH);

/*loads the background predefined white brush*/

wndclass.lpszMenuName=NULL;

wndclass.lpszClassName="MYCLASS";

if(!RegisterClass (&wndclass))

return(0);

}

hWnd=CreateWindow("TEXT EXAMPLE","Minimal

3",WS_OVERLAPPEDWINDOW,10,10,200,100,NULL,NULL,hInstance,

NULL); /*standard window style for program windowP*/

ShowWindow(hWnd,nCmdShow);



while(GetMessage(&msg,NULL,NULL,NULL))

{

DispatchMessage(&msg);

}

return(msg.wParam);

}

long FAR PASCAL WndProc(HWND hWnd,UINT

wMessage,WPARAM wParam,LPARAM lParam)

{

Static BOOL bFirsTime = True;

Static HANDLE hStatic text, hStaticIcon, HstaticRECT;

HANDLE hInstance;

switch(wMessage)

{ case WM_DESTROY:

if (bFirsTime)

{

BFirsTime = Flase; /*get the instance handle */

hInstance = GetWindowWord(hWnd, GWW_HINSTANCE);

hStayicText = createWindow(“STATIC”, THIS IS A TEXT”

10,10,130,60, NULL,NULL,NULL,NULL);

ShowWindow(hStaticText, SW_SHOWNORMAL);

}

Break;

case WM_DESTROY:

PostQuitMessage(0);

break;

default:

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

}

return(0L);}

Q3. Taking an example, show how Windows do default message

processing?



Ans

Example:-

#include <windows.h>

int PASCAL WinMain (HANDLE hInstance,HANDLE

hPrevInstance,LPSTR lpszCmdLine,

int nCmdShow)

{

HWND hWnd; /*Creating The program window*/

MSG msg;

hWnd = CreateWindow ("BUTTON", "Hello World.",

BS_PUSHBUTTON,

10,10,100,100,NULL,NULL,hInstance,NULL);

ShowWindow (hWnd,nCmdShow);while (GetMessage(&msg,NULL,NULL,NULL))

{

if(msg.message==KEYUP)

break;

else

DefWindowProc(msg.hwnd,msg.message,msg.wParam,msg.lParam);

}

return (0); }

Q4. Create a program window to show the text written by the user.

Ans

#include<Windows.h>

char szSize[100];

char szTitle[] = "These are the dimensions of your client area:";

HFONT hfOld = SelectObject(hdc, hf);

SetBkColor(hdc, g_rgbBackground);

SetTextColor(hdc, g_rgbText);

if(g_bOpaque)

{



SetBkMode(hdc, OPAQUE);

}

else

{

SetBkMode(hdc, TRANSPARENT);

}

DrawText(hdc, szTitle, -1, prc, DT_WORDBREAK);

wsprintf(szSize, "{%d, %d, %d, %d}", prc->left, prc->top, prc->right,

prc->bottom);

DrawText(hdc, szSize, -1, prc, DT_SINGLELINE | DT_CENTER |

DT_VCENTER);

SelectObject(hdc, hfOld); }

Q5. Identify the function and message designed to make termination of

window application.

Ans Function are:-

For keyboard:

•

If(msg.message==WM_KEYDOWN)For mouse click:

• If(msg.message==WM_RBUTTONDOWN)

• If(msg.message==WM_LBUTTON

EXAMPLE:-

#include <windows.h>

int PASCAL WinMain (HANDLE hInstance,HANDLE

hPrevInstance,LPSTR lpszCmdLine, int nCmdShow)

{ HWND hWnd; /*Creating The program window*/

MSG msg;

hWnd = CreateWindow ("BUTTON", "Hello World.",

BS_PUSHBUTTON, 10,10,100,100,NULL,NULL,hInstance,NULL);

ShowWindow (hWnd,nCmdShow);

while (GetMessage(&msg,NULL,NULL,NULL))



{

if(msg.message==WM_KEYDOWN)

break;

if else(msg.message==WM_RBUTTONDOWN)

break;

if else(msg.message==WM_RBUTTONDOWN)

break;

else

DefWindowProc(msg.hwnd,msg.message,msg.wParam,msg.lParam);

}

return (0);

}

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