Child window on a parent window client area with caption chaging facility

#include<windows.h>


#include "resource.h"


#define ID_ABC 21


LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

LRESULT CALLBACK ChildProc(HWND,UINT,WPARAM,LPARAM);


int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpszCmdLine,int nCmdShow)


{

HWND hwnd;

MSG msg;

WNDCLASS w;

if(!hPrevInstance)


{

w.cbClsExtra=0;

w.cbWndExtra=0;

w.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);

        w.hIcon=LoadIcon(NULL,IDC_ARROW);

w.hCursor=LoadCursor(NULL,IDI_APPLICATION);

w.hInstance=hInstance;

w.lpfnWndProc=WndProc;

w.lpszClassName=TEXT("MYCLASS");


w.lpszMenuName=MAKEINTRESOURCE(IDR_MENU1);

w.style=CS_HREDRAW|CS_VREDRAW;

if(!RegisterClass(&w))


{

return 0;


}

   }

  w.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);

  w.lpfnWndProc=ChildProc;

  w.lpszClassName=TEXT("ChildClass");


  w.lpszMenuName=NULL;

  if(!RegisterClass(&w))


{

return 0;


}

  hwnd=CreateWindow(TEXT("MyClass"),TEXT("WINDOW"),WS_OVERLAPPEDWINDOW,10,20,500,500,NULL,NULL,hInstance,NULL);


  ShowWindow(hwnd,nCmdShow);

  UpdateWindow(hwnd);

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


  {

  TranslateMessage(&msg);

  DispatchMessage(&msg);

  }

  return msg.wParam;


}


LRESULT CALLBACK WndProc(HWND hwnd,UINT message, WPARAM wParam,LPARAM lParam)

{

static BOOL hcreate=TRUE;


static HWND hchild;


HDC hdc;

PAINTSTRUCT ps;

RECT rect;

switch(message)


{

case WM_CREATE:


return 0;


case WM_COMMAND:


switch(wParam)


{

case ID_CREATE:


if(hcreate==TRUE)


{

hcreate=FALSE;

hchild=CreateWindow(TEXT("ChildClass"),TEXT("CHILD"),WS_CHILD|WS_BORDER|WS_THICKFRAME|WS_SIZEBOX|WS_VISIBLE|WS_CAPTION,20,50,100,100,hwnd,NULL,(HINSTANCE)GetWindowLong(hwnd,GWL_HINSTANCE),NULL);


}

break;


case ID_SEND:


SendMessage(hchild,WM_USER,0,0L);

break;


}

break;


case WM_PAINT:


hdc=BeginPaint(hwnd,&ps);

GetClientRect(hwnd,&rect);

TextOut(hdc,10,20,TEXT("Hello Sir Jiiiiiiii"),2);


EndPaint(hwnd,&ps);

break;


case WM_DESTROY:


PostQuitMessage(0);

break;


}

return DefWindowProc(hwnd,message,wParam,lParam);


}


LRESULT CALLBACK ChildProc(HWND h,UINT m,WPARAM w,LPARAM l)

{

static BOOL p=FALSE;


//static HANDLE hpr;


     //static HWND hpush;


//HINSTANCE his;


HDC hdc;

PAINTSTRUCT ps;

RECT rect;

switch(m)


{

   if(!p)


   {

   p=TRUE;

  

case WM_CREATE:


//hpr=GetParent(h);




CreateWindow(TEXT("BUTTON"),TEXT("PUSH IT"),WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON|WS_BORDER,10,50,70,20,h,(HMENU) ID_ABC,(HINSTANCE)GetWindowLong(h,GWL_HINSTANCE),NULL);


     

}

break;


case WM_USER:


SetWindowText(h,TEXT("THIS IS A CHILD WINDOW DUDE"));


break;


case WM_COMMAND:


switch(w)


{

case ID_ABC:


MessageBox(h,TEXT("i m tired "),TEXT("WINDOW"),MB_OK);


break;


}

         break;


     case WM_PAINT:


hdc=BeginPaint(h,&ps);

GetClientRect(h,&rect);

TextOut(hdc,20,30,TEXT("Hello Sir Jiiiiiiii u re in child window now"),29);


EndPaint(h,&ps);

break;


case WM_DESTROY:


PostQuitMessage(0);

break;


}

return DefWindowProc(h,m,w,l);


}


Gurpreet Singh