// Track whether Dispose has been called.
// The class constructor.
public ImageData(string imagePath)
{
if (string.IsNullOrEmpty(imagePath))
{
return;
}
_imageHandle = Win32.SHLoadImageFile(imagePath);
if (_imageHandle != IntPtr.Zero)
{
var bm = new Win32.BITMAP();
Win32.GetObject(_imageHandle, Marshal.SizeOf(bm), ref bm);
_ImageSize.Height = bm.bmHeight;
_ImageSize.Width = bm.bmWidth;
ViewportSize = ImageSize;
}
}
private void button7_Click(object sender, EventArgs e)
{
//from msdn: CreateCompatibleBitmap function
//The color format of the bitmap created by the CreateCompatibleBitmap function matches the color format of the device identified by the hdc parameter.
//This bitmap can be selected into any memory device context that is compatible with the original device.
//Because memory device contexts allow both color and monochrome bitmaps,
//the format of the bitmap returned by the CreateCompatibleBitmap function differs when the specified device context is a memory device context.
//However, a compatible bitmap that was created for a nonmemory device context always possesses the same color format
//and uses the same color palette as the specified device context.
//Note: When a memory device context is created, it initially has a 1 - by - 1 monochrome bitmap selected into it.
//If this memory device context is used in CreateCompatibleBitmap, the bitmap that is created is a monochrome bitmap.
//To create a color bitmap, use the HDC that was used to create the memory device context, as shown in the following code:
IntPtr winHwnd = panel2.Handle;
IntPtr hdc = Win32.MyWin32.GetDC(winHwnd);
IntPtr hbmp = Win32.MyWin32.CreateCompatibleBitmap(hdc, 400, 50);
//Bitmap bmp = new Bitmap(panel2.Width, panel2.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
//IntPtr hbmp = bmp.GetHbitmap();
Win32.MyWin32.SelectObject(hdc, hbmp);
IntPtr hfont = ff.ToHfont();
Win32.MyWin32.SelectObject(hdc, hfont);
Win32.MyWin32.SetTextColor(hdc, 0);
Win32.NativeTextWin32.TextOut(hdc, 0, 0, "OKOK\0", 4);
Win32.BITMAP win32Bitmap = new Win32.BITMAP();
unsafe
{
Win32.MyWin32.GetObject(hbmp,
System.Runtime.InteropServices.Marshal.SizeOf(typeof(Win32.BITMAP)),
&win32Bitmap);
}
Win32.MyWin32.ReleaseDC(winHwnd, hdc);
Win32.MyWin32.DeleteObject(hbmp);
//--------------------------------------------
}
