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Loading images

 
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Carlos



Joined: 19 Mar 2004
Posts: 396
Location: Canyon, TX
PostPosted: Fri Dec 31, 2004 3:04 pm    Post subject: Loading images Reply with quote
Is it possible to load an image in a control, say, a panel? The source could either be a file or a resource (or maybe even a stream). If not, I'd like that.
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Chris Miller



Joined: 27 Mar 2004
Posts: 514
Location: The Internet
PostPosted: Mon Jan 03, 2005 1:04 am    Post subject: Re: Loading images Reply with quote
Carlos wrote:
Is it possible to load an image in a control, say, a panel?
No, but you can do it yourself by attaching a paint handler and using the BitBlt() GDI function. Windows API LoadImageA() can be used to load up the image. PictureBox control and loading and blitting images will be added to DFL some time, but I don't think there will ever be an image property on controls as seen in other GUI libraries. Here's a snippet you can use:
Code:
extern(Windows)
{
   enum: UINT
   {
      LR_LOADFROMFILE = 0x0010,
   }
   BOOL BitBlt(HDC hdcDest, int nXDest, int nYDest, int nWidth, int nHeight, HDC hdcSrc, int nXSrc, int nYSrc, DWORD dwRop);
}

const int FOO_WIDTH = 50;
const int FOO_HEIGHT = 50;
HBITMAP hbm;
hbm = LoadImageA(null, "foo.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
if(!hbm)
   throw new Exception("Unable to load image.");
myForm.paint ~= &myForm_paint;

void myForm_paint(Object sender, PaintEventArgs ea)
{
   HDC memdc;
   HGDIOBJ hgo;
   memdc = CreateCompatibleDC(ea.graphics.handle);
   hgo = SelectObject(memdc, hbm);
   BitBlt(ea.graphics.handle, 0, 0, FOO_WIDTH, FOO_HEIGHT, memdc, 0, 0, SRCCOPY);
   SelectObject(memdc, hgo); // Old bitmap.
   DeleteDC(memdc);
}
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Carlos



Joined: 19 Mar 2004
Posts: 396
Location: Canyon, TX
PostPosted: Tue Jan 04, 2005 8:32 pm    Post subject: Re: Loading images Reply with quote
Vathix wrote:
Carlos wrote:
Is it possible to load an image in a control, say, a panel?
No, but you can do it yourself by attaching a paint handler and using the BitBlt() GDI function. Windows API LoadImageA() can be used to load up the image. PictureBox control and loading and blitting images will be added to DFL some time, but I don't think there will ever be an image property on controls as seen in other GUI libraries. Here's a snippet you can use:
Code:
extern(Windows)
{
   enum: UINT
   {
      LR_LOADFROMFILE = 0x0010,
   }
   BOOL BitBlt(HDC hdcDest, int nXDest, int nYDest, int nWidth, int nHeight, HDC hdcSrc, int nXSrc, int nYSrc, DWORD dwRop);
}

const int FOO_WIDTH = 50;
const int FOO_HEIGHT = 50;
HBITMAP hbm;
hbm = LoadImageA(null, "foo.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
if(!hbm)
   throw new Exception("Unable to load image.");
myForm.paint ~= &myForm_paint;

void myForm_paint(Object sender, PaintEventArgs ea)
{
   HDC memdc;
   HGDIOBJ hgo;
   memdc = CreateCompatibleDC(ea.graphics.handle);
   hgo = SelectObject(memdc, hbm);
   BitBlt(ea.graphics.handle, 0, 0, FOO_WIDTH, FOO_HEIGHT, memdc, 0, 0, SRCCOPY);
   SelectObject(memdc, hgo); // Old bitmap.
   DeleteDC(memdc);
}


Ok. Thanks.
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