I work with BCB 1.0.
In my form there is a TPrintDialog and a TImage.
When I try to print using Image1->Canvas my prog don't work, but when
I print with the form canvas it work. Why?

This is my simple prog:

//---------------------------------------------------------------
#include <vcl\vcl.h>
#pragma hdrstop

#include <printers.hpp>
#include "Main.h"
static TCanvas *cnv;
//---------------------------------------------------------------
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner): TForm(Owner)
{
  cnv=Image1->Canvas;

  // Deleting next line don't print!
  //---------------------------------
  Image1->Hide(); cnv=Canvas;

//---------------------------------------------------------------
void __fastcall TForm1::FormPaint(TObject *Sender)
{
  cnv->Rectangle(10,30,290,150);
//---------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
  if(PrintDialog1->Execute())
  {
    Printer()->BeginDoc();
    StretchBlt(
      Printer()->Handle,// handle of destination device context
      100, // x-coordinate of upper-left corner of dest. rect.
      100, // y-coordinate of upper-left corner of dest. rect.
      900, // width of destination rectangle
      900, // height of destination rectangle
      cnv->Handle, // handle of source device context
      0,  // x-coordinate of upper-left corner of source rectangle
      0,  // y-coordinate of upper-left corner of source rectangle
      Image1->Width, // width of source rectangle
      Image1->Height,// height of source rectangle
      SRCCOPY   // raster operation code
    );
    Printer()->EndDoc();
  }
file://----------------------------------------------------------------

Hi Cristiano,

The StretchBlt() API function can't be reliably used to render an image
to the device context different device such as that of the printer.
Instead, convert your Image to a Device-Independant Bitmap (DIB), then
use the StretchDIBits() API function.  Have a look at the following page
for more info...

http://bcbcaq.freeservers.com/print_graphics.html

Good luck!

Damon