Take the following steps to start a project and add some code that will create a new container handle:
Start Visual C++, version 2005.
Select the File->New->Project menu option.
In the New Project dialog box, enter the location (c:\lead\examples\container). Make sure to select the Win32->Win32 Project as the project type. Give the project the name "tutorial" and press Enter, and then click Finish.
Change the path of the output exe file path to the LEADTOOLS Bin directory as follows:
C:\\LEADTOOLS21\\Bin\\CDLLVC10\\Win32\\$(ProjectName).exe
Double-click the tutorial.rc file from the Solution Explorer window, and then expand the Menu item, and then double-click the IDC_TUTORIAL menu.
Modify the File Menu to match the following structure:
IDR_TUTORIAL
&File
&Open with ID = IDM_FILE_OPEN
E&xit with ID = IDM_EXIT
Now go back to the Solution Explorer window, and open the stdafx.h file.
Append the following lines to the end of the file: (Please note to change the path to the location of the LEADTOOLS toolkit on your machine)
#include <CommDlg.h>
// LEAD Header Files
#include "C:/LEADTOOLS21/Include/L_Bitmap.h"
#include "C:/LEADTOOLS21/Include/Ltdlg.h"
#include "C:/LEADTOOLS21/Include/Ltfil.h"
#include "C:/LEADTOOLS21/Include/ltcon.h"
Right-click Tutorial.rc, and select View Code.
Search for the IDS_APP_TITLE id, and change its value from "tutorial" to "Container Tutorial".
Create a new file called Imports.cpp as follows:
#include "StdAfx.h"
#if defined(FOR_WIN64)
#pragma comment(lib, "C:\\LEADTOOLS21\\Lib\\CDLLVC10\\x64\\Ltkrn_x.lib")
#pragma comment(lib, "C:\\LEADTOOLS21\\Lib\\CDLLVC10\\x64\\Ltdis_x.lib")
#pragma comment(lib, "C:\\LEADTOOLS21\\Lib\\CDLLVC10\\x64\\Ltfil_x.lib")
#pragma comment(lib, "C:\\LEADTOOLS21\\Lib\\CDLLVC10\\x64\\Ltdlgkrn_x.lib")
#pragma comment(lib, "C:\\LEADTOOLS21\\Lib\\CDLLVC10\\x64\\Ltdlgfile_x.lib")
#pragma comment(lib, "C:\\LEADTOOLS21\\Lib\\CDLLVC10\\x64\\Ltcon_x.lib")
#elif defined(FOR_WIN32)
#pragma comment(lib, "C:\\LEADTOOLS21\\Lib\\CDLLVC10\\Win32\\Ltkrn_u.lib")
#pragma comment(lib, "C:\\LEADTOOLS21\\Lib\\CDLLVC10\\Win32\\Ltdis_u.lib")
#pragma comment(lib, "C:\\LEADTOOLS21\\Lib\\CDLLVC10\\Win32\\Ltfil_u.lib")
#pragma comment(lib, "C:\\LEADTOOLS21\\Lib\\CDLLVC10\\Win32\\Ltdlgkrn_u.lib")
#pragma comment(lib, "C:\\LEADTOOLS21\\Lib\\CDLLVC10\\Win32\\Ltdlgfile_u.lib")
#pragma comment(lib, "C:\\LEADTOOLS21\\Lib\\CDLLVC10\\Win32\\Ltcon_u.lib")
#endif // #if defined(FOR_WIN64)
Now open the tutorial.cpp file by double-clicking it in the Solution Explorer.
WndProc
function, and then delete the entire function. Copy the following code and insert it in its place.
static L_VOID OnSize
(
HWND hWnd,
pBITMAPHANDLE pBitmap,
LPRECT prcView,
L_INT cx,
L_INT cy,
L_INT nZoom,
L_INT *pnHScroll,
L_INT *pnVScroll
)
{
SCROLLINFO si ;
L_INT nXOffset, nYOffset ;
if ( NULL != pBitmap && pBitmap->Flags.Allocated )
{
si.cbSize = sizeof ( SCROLLINFO ) ;
si.fMask = SIF_ALL ;
// vertical scroll.
GetScrollInfo ( hWnd, SB_VERT, &si ) ;
si.nMin = 0 ;
si.nMax = BITMAPHEIGHT ( pBitmap ) ;
si.nPage = MulDiv ( cy, 100, nZoom ) ;
SetScrollInfo ( hWnd, SB_VERT, &si, TRUE ) ;
GetScrollInfo ( hWnd, SB_VERT, &si ) ;
*pnVScroll = si.nPos ;
// horizontal scroll
GetScrollInfo ( hWnd, SB_HORZ, &si ) ;
si.nMin = 0 ;
si.nMax = BITMAPWIDTH ( pBitmap ) ;
si.nPage = MulDiv ( cx, 100, nZoom ) ;
SetScrollInfo ( hWnd, SB_HORZ, &si, TRUE ) ;
GetScrollInfo ( hWnd, SB_HORZ, &si ) ;
*pnHScroll = si.nPos ;
}
else
{
si.cbSize = sizeof ( SCROLLINFO ) ;
si.fMask = SIF_RANGE ;
si.nMin = 0 ;
si.nMax = 0 ;
SetScrollInfo ( hWnd, SB_VERT, &si, TRUE ) ;
SetScrollInfo ( hWnd, SB_HORZ, &si, TRUE ) ;
*pnHScroll = 0 ;
*pnVScroll = 0 ;
}
// set the painting rectangle.
SetRect ( prcView, 0, 0, BITMAPWIDTH ( pBitmap ), BITMAPHEIGHT ( pBitmap ) ) ;
if ( nZoom < 100 )
{
nXOffset = MulDiv ( *pnHScroll, 100, nZoom ) ;
nYOffset = MulDiv ( *pnVScroll, 100, nZoom ) ;
}
else
{
nXOffset = *pnHScroll ;
nYOffset = *pnVScroll ;
}
OffsetRect ( prcView, - nXOffset, - nYOffset ) ;
prcView->left = MulDiv ( prcView->left, nZoom, 100 ) ;
prcView->top = MulDiv ( prcView->top, nZoom, 100 ) ;
prcView->right = MulDiv ( prcView->right, nZoom, 100 ) ;
prcView->bottom = MulDiv ( prcView->bottom, nZoom, 100 ) ;
}
L_VOID OnHScroll
(
HWND hWnd,
L_UINT code,
L_INT nZoom,
LPRECT prcView,
L_INT *pnHScroll,
L_INT *pnVScroll
)
{
SCROLLINFO si ;
si.cbSize = sizeof (SCROLLINFO) ;
si.fMask = SIF_ALL ;
GetScrollInfo (hWnd, SB_HORZ, &si) ;
*pnHScroll = si.nPos ;
switch ( code )
{
case SB_LINELEFT:
si.nPos -= 1 ;
break ;
case SB_LINERIGHT:
si.nPos += 1 ;
break ;
case SB_PAGELEFT:
si.nPos -= si.nPage ;
break ;
case SB_PAGERIGHT:
si.nPos += si.nPage ;
break ;
case SB_THUMBTRACK:
si.nPos = si.nTrackPos ;
break ;
default:
break ;
}
si.fMask = SIF_POS ;
SetScrollInfo (hWnd, SB_HORZ, &si, TRUE) ;
GetScrollInfo (hWnd, SB_HORZ, &si) ;
if ( si.nPos != *pnHScroll )
{
L_INT dxUpdate ;
// update screen.
if ( nZoom >= 100 )
{
dxUpdate = MulDiv ( ( *pnHScroll - si.nPos ), nZoom, 100 ) ;
}
else
{
dxUpdate = *pnHScroll - si.nPos ;
}
// update screen.
OffsetRect ( prcView, dxUpdate, 0 ) ;
ScrollWindow ( hWnd, dxUpdate, 0, NULL, NULL ) ;
*pnHScroll = si.nPos ;
UpdateWindow ( hWnd ) ;
}
}
L_VOID OnVScroll
(
HWND hWnd,
L_UINT code,
L_INT nZoom,
LPRECT prcView,
L_INT *pnHScroll,
L_INT *pnVScroll
)
{
SCROLLINFO si ;
si.cbSize = sizeof ( SCROLLINFO ) ;
si.fMask = SIF_ALL ;
GetScrollInfo (hWnd, SB_VERT, &si) ;
*pnVScroll = si.nPos ;
switch ( code )
{
case SB_LINEUP:
si.nPos -= 1 ;
break ;
case SB_LINEDOWN:
si.nPos += 1 ;
break ;
case SB_PAGEUP:
si.nPos -= si.nPage ;
break ;
case SB_PAGEDOWN:
si.nPos += si.nPage ;
break ;
case SB_THUMBTRACK:
si.nPos = si.nTrackPos ;
break ;
default:
break ;
}
si.fMask = SIF_POS ;
SetScrollInfo ( hWnd, SB_VERT, &si, TRUE ) ;
GetScrollInfo ( hWnd, SB_VERT, &si ) ;
if ( si.nPos != *pnVScroll )
{
L_INT dyUpdate ;
// update screen.
if ( nZoom >= 100 )
{
dyUpdate = MulDiv ( ( *pnVScroll - si.nPos ), nZoom, 100 ) ;
}
else
{
dyUpdate = *pnVScroll - si.nPos ;
}
// update screen.
OffsetRect ( prcView, 0, dyUpdate ) ;
ScrollWindow ( hWnd, 0, dyUpdate, NULL, NULL ) ;
*pnVScroll = si.nPos ;
UpdateWindow ( hWnd ) ;
}
}
L_VOID OnPaint
(
HWND hWnd,
pBITMAPHANDLE pBitmap,
LPRECT prcView,
HPALETTE hPalette
)
{
HDC hDC ;
PAINTSTRUCT ps ;
HPALETTE hOldPal = NULL ;
hDC = BeginPaint (hWnd, &ps) ;
if ( pBitmap->Flags.Allocated )
{
if ( hPalette )
{
hOldPal = SelectPalette ( hDC, hPalette, TRUE ) ;
RealizePalette ( hDC ) ;
}
L_PaintDC ( hDC, pBitmap, NULL, NULL, prcView, &ps.rcPaint, SRCCOPY ) ;
if ( NULL != hOldPal )
{
SelectPalette ( hDC, hOldPal, TRUE ) ;
}
}
EndPaint (hWnd, &ps) ;
}
static L_BOOL OnOpen ( HWND hWnd, pBITMAPHANDLE pBitmap )
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
static BITMAPHANDLE hBitmap ;
static RECT rcView ;
static HPALETTE hPalette = NULL ;
static L_INT nVScroll = 0 ;
static L_INT nHScroll = 0 ;
static L_INT nZoomFactor = 100 ;
switch (message)
{
case WM_CREATE:
L_DlgInit (DLG_INIT_COLOR) ;
break;
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
return 0;
case IDM_FILE_OPEN:
{
BITMAPHANDLE hTempBitmap ;
HDC hDC ;
if ( OnOpen ( hWnd, &hTempBitmap ) )
{
if ( hBitmap.Flags.Allocated )
{
L_FreeBitmap ( &hBitmap ) ;
}
if ( hPalette )
{
DeleteObject ( hPalette ) ;
}
L_CopyBitmapHandle ( &hBitmap, &hTempBitmap, sizeof(BITMAPHANDLE) ) ;
hDC = GetDC ( hWnd ) ;
hPalette = L_CreatePaintPalette ( hDC, &hBitmap ) ;
ReleaseDC ( hWnd, hDC ) ;
{//ADJUST WINDOW SIZE
RECT rcWindow ;
L_INT nWidth, nHeight ;
SystemParametersInfo ( SPI_GETWORKAREA, 0, &rcWindow, 0 ) ;
nWidth = min ( MulDiv ( BITMAPWIDTH ( &hBitmap ), nZoomFactor, 100 ),
( rcWindow.right - rcWindow.left ) ) ;
nHeight = min ( MulDiv ( BITMAPHEIGHT ( &hBitmap ), nZoomFactor, 100 ),
( rcWindow.bottom - rcWindow.top ) ) ;
MoveWindow ( hWnd,
0,
0,
nWidth,
nHeight,
TRUE ) ;
}//ADJUST WINDOW SIZE
InvalidateRect ( hWnd, NULL, TRUE ) ;
}
}
}
return 0;
case WM_SIZE:
OnSize ( hWnd,
&hBitmap,
&rcView,
LOWORD ( lParam ),
HIWORD ( lParam ),
nZoomFactor,
&nHScroll,
&nVScroll ) ;
break ;
case WM_HSCROLL:
OnHScroll ( hWnd,
LOWORD ( wParam ),
nZoomFactor,
&rcView,
&nHScroll,
&nVScroll ) ;
break ;
case WM_VSCROLL:
OnVScroll ( hWnd,
LOWORD ( wParam ),
nZoomFactor,
&rcView,
&nHScroll,
&nVScroll ) ;
break ;
case WM_PAINT:
OnPaint ( hWnd, &hBitmap, &rcView, hPalette ) ;
break;
case WM_DESTROY:
if ( hBitmap.Flags.Allocated )
{
L_FreeBitmap ( &hBitmap ) ;
}
if (hPalette)
{
DeleteObject ( hPalette ) ;
}
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hWnd, message, wParam, lParam);
}
WndProc
function:
static pCONTAINERHANDLE pContainer ;
WndProc
function with the following code:
if ( SUCCESS == L_ContainerInit ( &pContainer ) )
{
L_ContainerCreate ( pContainer, hWnd ) ;
return 0L ;
}
else
{
return -1L ;
}
WndProc
function, before the statement "PostQuitMessage" in the "case WM_DESTROY:"
if ( SUCCESS == L_ContainerIsValid ( pContainer ) )
{
L_ContainerFree ( pContainer ) ;
}
WndProc
function, before the InvalidateRect
function call in the "case IDM_FILE_OPEN:" statement:
L_ContainerReset ( pContainer ) ;