FAQ: How to set the size of the thumbnail image?

The default thumbnail width and height is set to zero, the image will be saved with full size. You can call SetThumbSize() to set the thumbnail image size.

Example

An example for VC++:

void SnapExample()
{
  HRESULT hr;
  IThumbMaker * t_xpMaker = NULL;
  // Initializes the COM library on the current thread
  CoInitialize(NULL); 

  hr = CoCreateInstance(
    __uuidof(ThumbMaker), NULL, CLSCTX_INPROC_SERVER, 
    __uuidof(IThumbMaker), (void**)&t_xpMaker
    );

  if ( SUCCEEDED(hr)  )
  {
    long t_lRet = 0;
    t_xpMaker->SetURL( _T("http://www.acasystems.com") );
    t_lRet = t_xpMaker->StartSnap();
    if ( 0 == t_lRet )
    {
      // save image with full size
      t_xpMaker->SetThumbSize (0,0,0);
      t_xpMaker->SaveImage( _T("c:/acasystems_full.png") );
      // set image size to 320x240, keep ratio by width
      t_xpMaker->SetThumbSize (320,240,0);
      t_xpMaker->SaveImage( _T("c:/acasystems_320x240.png") );
      // set image width to 320, auto calculate the image height.
      t_xpMaker->SetThumbSize (320,0,0);
      t_xpMaker->SaveImage( _T("c:/acasystems_320xauto.png") );
      // set image height 240, auto calculate the image width.
      t_xpMaker->SetThumbSize (0,240,0);
      t_xpMaker->SaveImage( _T("c:/acasystems_autox240.png") );
    }
    t_xpMaker->Release();
  }
}

An example for PHP:

<?php
  $t_xMaker = new COM('ACAWebThumb.ThumbMaker')
    or die("Start ACAWebThumb.ThumbMaker failed");

  $t_xMaker->SetURL("http://www.acasystems.com"); 
  if ( 0 == $t_xMaker->StartSnap() )
  {
    // save image with full size
    $t_xMaker->SetThumbSize (0,0,0);
    $t_xMaker->SaveImage( "c:/acasystems_full.png") ;
    // set image size to 320x240, keep ratio by width
    $t_xMaker->SetThumbSize (320,240,0);
    $t_xMaker->SaveImage( "c:/acasystems_320x240.png");
    // set image width to 320, auto calculate the image height.
    $t_xMaker->SetThumbSize (320,0,0);
    $t_xMaker->SaveImage( "c:/acasystems_320xauto.png");
    // set image height 240, auto calculate the image width.
    $t_xMaker->SetThumbSize (0,240,0);
    $t_xMaker->SaveImage( "c:/acasystems_autox240.png");
    echo "Take screenshot successful. "; 
  }
?>

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