Capturing an Active Window (Visual C++ 5.0 and later)

Capturing an Active Window (Visual C++ 5 and later)

Take the following steps to start a project and to add some code that will let you capture an active window.

1.	Start a new project as follows:
	Run Microsoft Visual C++ 5.0, select the File >New menu option, and do the following:
	a.	Click the Projects tab.
	b.	Select MFC AppWizard (exe) as the project type
	c.	In the Project name text box, specify ScrCap.
	d.	In the Location text box, specify the path of the project.
	e.	Click the OK button.
2.	In the Step 1 dialog box, do the following:
	a.	Select Dialog based.
	b.	Click the Next button.
3.	In the Step 2 of 4 dialog box, do the following:
	a.	Ensure that 3D controls is selected.
	b.	Select ActiveX controls.
	c.	Click the Next button.
4.	In the Step 3 of 4 dialog box, do the following:
	a.	For comments, ensure that Yes, Please is selected.
	b.	For how to use the MFC library, select As a shared DLL.
	c.	Click the Next button.
5.	In the Step 4 of 4 dialog box, just click Finish. Read New Project Information, and click OK. (The AppWizard creates the project files and opens the project.)
6.	Add #import and #include statements to your program so you can access the LEAD COM constants and classes:
	a.	In the Project Workspace, click the FileView tab.
	b.	Double-click the tutor files folder to open it.
	c.	Double-click the Header Files folder to open it.
	d.	Double-click the StdAfx.h file to edit it.
	e.	Add the following lines to the end of the file near //{{AFX_INSERT_LOCATION}} (keep in mind, you may have to change the path to where the dll's reside):

#import "c:\win98\system\ltrvr14n.dll" no_namespace, named_guids
#import "c:\win98\system\ltr14n.dll" no_namespace, named_guids
#import "c:\win98\system\ltrvw14n.ocx" no_namespace, named_guids
#import "c:\win98\system\ltrio14n.dll" no_namespace, named_guids
#import "c:\win98\system\ltrsc14n.dll" no_namespace, named_guids

7.	Edit the ScrCapDlg.cpp file and insert at the top of the file after the #include statement:

#include "leadraster.h"

8.	Add the LEAD Raster View Control (14.5) to your project:
	a.	In the Project Workspace, click the ResourceView tab.
	b.	Double-click the ScrCap resources folder to open it.
	c.	Double-click the Dialog folder to open it.
	d.	Double-click IDD_SCRCAP_DIALOG to design the dialog box.
	e.	Select the TODO... text control; then press the Delete key to delete it.
	f.	From the main menu, select Project > Add To Project > Components and controls.
	g.	Select Registered ActiveX controls.
	h.	Double-click the LEAD Raster View Control (14.5) icon. (The Confirm Classes dialog box appears.)
	i.	Ensure that CLEADRasterView, CLEADRaster and CPicture are checked.
	j.	Click OK to complete the selection. Click OK to insert the component.
	k.	Click the LEAD RasterView Control icon; then size and position the control as you want it to appear at run time.
	l.	Use the right mouse button to edit the properties of the new LEAD RasterView Control.
	m.	Change the ID to IDC_LEADRASTERVIEW1.
9.	Add a command button and set the ID and Caption properties as follows:

	ID	Caption
	IDC_CAPWIN	Capture Window
10.	Edit the ScrCapDlg.h file and change the definition of CScrCapDlg : CDialog by inserting the following lines after DECLARE_MESSAGE_MAP():

public:
ILEADRasterScr *m_pLEADRasterScr;

11.	Do the following to add m_LEADRasterView1 to the ScrCapDlg class and link the variable to the LEAD RasterView control using dynamic data exchange:
	a.	Press Ctrl-W. (The MFC ClassWizard dialog box appears.)
	b.	Click the Member Variables tab.
	c.	In the Class Name box, select CScrCapDlg.
	d.	In the Control IDs list, select IDC_LEADRASTERVIEW1.
	e.	Click the Add Variable... button.
	f.	Specify m_LEADRasterView1 as the variable name, and Control as the category.
	g.	Click OK to close the dialog box, and click OK to close the MFC ClassWizard.
12.	Edit the ScrCapDlg.cpp file and add the following code to the end of the OnInitDialog function (just before return TRUE):

//Create the RasterScr object
CoCreateInstance(CLSID_LEADRasterScr, NULL, CLSCTX_ALL, IID_ILEADRasterScr, (void**)&m_pLEADRasterScr);

13.	Press Ctrl-W to go to the MFC Class Wizard; then do the following:
	a.	In the Class name combo box, select CScrCapDlg.
	b.	In the Object IDs list box, select CScrCapDlg.
	c.	In the Messages list box, select WM_DESTROY.
	d.	Click the Add function button. Choose OK for the default function name (OnDestroy).
	e.	Click the Edit Code button to start entering the code.
	f.	Enter new code as follows (just before the CDialog::OnDestroy call):

m_pLEADRasterScr->StopCapture ();
m_pLEADRasterScr->Release();

14.	Back in MFC Class Wizard, do the following:
	a.	Click the Message Maps tab.
	b.	In the Class Name combo box, select CScrCapDlg.
	c.	In the Object IDs list box, select IDC_CAPWIN.
	d.	In the Messages list box, select BN_CLICKED.
	e.	Click the Add function button. Choose OK for the default function name (OnCapwin).
	f.	Click the Edit Code button and code the OnCapwin procedure as follows:

void CScrCapDlg::OnCapwin()
{
   /* set the hot key to be F10 */
   m_pLEADRasterScr->PutCaptureHotKey (121);
   m_pLEADRasterScr->PutCaptureDelay (3000);
   m_pLEADRasterScr->CaptureActiveWindow ();
   m_LEADRasterView1.GetRaster().SetBitmap(m_pLEADRasterScr->GetBitmap ());
}

15.	On the main menu, select Build> Build ScrCap.exe to build the project.
16.	On the main menu, select Build> Execute ScrCap.exe to run the project. Click the Capture Window command button, select the window to capture, press F10 and wait for 3 seconds.