Loading and Displaying an Image (C++ Builder 4.0)

Take the following steps to start a project and to add some code that displays an image on the main form:

1.	Start C++ Builder 4.0.
2.	If you didn’t install LEAD RasterView Control, install it.
	On the Component pull-down menu, use the Import ActiveX Control… and select the LEAD RasterView Control (14.5), and Press install.
3.	$image\btnlead.gif$ Select the LEAD RasterView control; then add the control to your main form. Size and position the control, as you want it to appear at run time.
4.	$image\btncmd.gif$ Add a button to your form and name it as follows:
	Name	Caption
	LoadLead	Load Image
5.	Code the main form's Create procedure as follows. In online help, you can use the Edit pull-down menu to copy the block of code.

void __fastcall TForm1::FormCreate(TObject *Sender)
{
//Set defaults for displaying the image
//These are all persistent properties that can be set in the properties box->
LEADRasterView1->Appearance = RASTERVIEW_APPEARANCE_FLAT;
LEADRasterView1->BorderStyle = 1;
LEADRasterView1->BackColor = (TColor)RGB(255, 255, 125);
LEADRasterView1->PaintDither = PAINTDITHER_DIFFUSION;
LEADRasterView1->PaintPalette = PAINTPALETTE_AUTO;
LEADRasterView1->AutoRepaint = True;
LEADRasterView1->AutoSize = False;
LEADRasterView1->AutoSetRects = True;
LEADRasterView1->PaintSizeMode = PAINTSIZEMODE_FIT;
LEADRasterView1->EnableFireMouse2Event = true;
}

6.	Code the LoadLead button's click procedure as follows:

void __fastcall TForm1::LoadLeadClick(TObject *Sender)
{
ILEADRasterIO * pRasterIO;
CoCreateInstance(CLSID_LEADRasterIO, NULL, CLSCTX_ALL, IID_ILEADRasterIO, (void**)&pRasterIO);
pRasterIO->Load (LEADRasterView1->Raster, AnsiToOLESTR("v:\\images\\image1.cmp"), 0, 0, 1);
pRasterIO->Release();
}

7.	On the Project pull-down menu, use the Import Type library… and select the LEAD Raster IO object library (14.5), and Press Ok.
8.	At the beginning of the Unit1.h file, Include these files.

#include "Ltrasteriolib_tlb.h"
#include "Ltrasterlib_tlb.h"

9.	Run your program to test it.
10.	Save the project to use as a starting point for other tasks in this tutorial.