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#include <windows.h>
LRESULT CALLBACK MainWindowProc(HWND,UINT,WPARAM,LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int iCmdShow)
{
WNDCLASSEX wcex;
static TCHAR szAppName[]={TEXT("Programme-2::TextOut on Multiple Lines")};
wcex.cbClsExtra=0;
wcex.cbSize=sizeof(WNDCLASSEX);
wcex.cbWndExtra=0;
wcex.hbrBackground=static_cast<HBRUSH>(GetStockObject(WHITE_BRUSH));
wcex.hCursor=LoadCursor(NULL,IDC_ARROW);
wcex.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wcex.hIconSm=LoadIcon(NULL,IDI_APPLICATION);
wcex.hInstance=hInstance;
wcex.lpfnWndProc=MainWindowProc;
wcex.lpszClassName=szAppName;
wcex.lpszMenuName=NULL;
wcex.style=0;
if(!RegisterClassEx(&wcex))
{
MessageBox(NULL,TEXT("Error: You need to run this Application under Windows NT!"),NULL,
MB_ICONERROR|MB_OK);
return 0;
}
HWND hMainWnd;
hMainWnd=CreateWindowEx(0,
szAppName,
szAppName,
WS_OVERLAPPEDWINDOW|WS_VSCROLL,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);
if(hMainWnd)
{
ShowWindow(hMainWnd,iCmdShow);
UpdateWindow(hMainWnd);
MSG msg;
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return static_cast<int>(msg.wParam);
}
return 0;
}
LRESULT CALLBACK MainWindowProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
TEXTMETRIC tm;
static long cyChar,cxChar,iScrollThumbPos=0,cyClient;
int i;
static TCHAR szBuffer[20];
switch(uMsg)
{
case WM_CREATE:
hdc=GetDC(hwnd);
GetTextMetrics(hdc,&tm);
cyChar=tm.tmHeight+tm.tmExternalLeading;
cxChar=tm.tmAveCharWidth;
ReleaseDC(hwnd,hdc);
SetScrollRange(hwnd,SB_VERT,0,1000-1,FALSE);
SetScrollPos(hwnd,SB_VERT,iScrollThumbPos,TRUE);
break;
case WM_SIZE:
cyClient=HIWORD(lParam);
break;
case WM_VSCROLL:
switch(LOWORD(wParam))
{
case SB_LINEUP:
if(iScrollThumbPos>0)
{
iScrollThumbPos--;
SetScrollPos(hwnd,SB_VERT,iScrollThumbPos,TRUE);
InvalidateRect(hwnd,NULL,TRUE);
UpdateWindow(hwnd);
}
break;
case SB_PAGEUP:
if(iScrollThumbPos>0)
{
iScrollThumbPos-=cyClient/cyChar;
SetScrollPos(hwnd,SB_VERT,iScrollThumbPos,TRUE);
InvalidateRect(hwnd,NULL,TRUE);
UpdateWindow(hwnd);
}
break;
case SB_THUMBPOSITION:
iScrollThumbPos=HIWORD(wParam);
SetScrollPos(hwnd,SB_VERT,iScrollThumbPos,TRUE);
InvalidateRect(hwnd,NULL,TRUE);
UpdateWindow(hwnd);
break;
case SB_PAGEDOWN:
if(iScrollThumbPos<1000-1)
{
iScrollThumbPos+=cyClient/cyChar;
SetScrollPos(hwnd,SB_VERT,iScrollThumbPos,TRUE);
InvalidateRect(hwnd,NULL,TRUE);
UpdateWindow(hwnd);
}
break;
case SB_LINEDOWN:
if(iScrollThumbPos<1000-1)
{
iScrollThumbPos++;
SetScrollPos(hwnd,SB_VERT,iScrollThumbPos,TRUE);
InvalidateRect(hwnd,NULL,TRUE);
UpdateWindow(hwnd);
}
break;
default:
break;
}
break;
case WM_PAINT:
hdc=BeginPaint(hwnd,&ps);
for(i=0;i<1000;i++)
{
TextOut(hdc,0,(cyChar-iScrollThumbPos)*i,TEXT("Random Genuis!!!"),16);
TextOut(hdc,700,(cyChar-iScrollThumbPos)*i,szBuffer,
wsprintf(szBuffer,L"Line #%i",i));
}
EndPaint(hwnd,&ps);
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
return 0;
}
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