// Returns the textual description of an error
public static string GetErrStr(J2K_Error errCode)
{
StringBuilder sb = new StringBuilder((int)J2K_Error.MaxErrorLen);
GetErrorString(errCode, sb);
return(sb.ToString());
}
private static extern void GetErrorString(J2K_Error errCode, StringBuilder errStr);
private void ShowImage(string fileName, int resolution)
{
// Open picture file and obtain an image handle
J2K_Image img = new J2K_Image(); img.version = J2K_Codec.Version;
J2K_Error err = J2K_Codec.OpenFile(fileName, ref img);
if (err != J2K_Error.Success)
{
// If error then show the error message and exit function
MessageBox.Show(J2K_Codec.GetErrStr(err), "Error");
J2K_Codec.Close(ref img);
return;
}
// Set resolution level and update Width and Height
img.resolution = resolution;
J2K_Codec.GetInfo(ref img);
// Show to the user the file name and size
InfoLabel.Text = string.Format("{0} | {1} x {2} x {3}",
new FileInfo(fileName).Name, img.Width, img.Height, img.Components);
// Create a bitmap info structure
BITMAPINFO bmp = new BITMAPINFO();
bmp.Size = Marshal.SizeOf(bmp);
bmp.Width = img.Width; // Image width
bmp.Height = img.Height; // Image height
bmp.Planes = 1;
bmp.BitCount = 32; // Always 4 bytes per pixel
bmp.Compression = 0; // No compression (RGB format)
bmp.SizeImage = 0;
bmp.XPelsPerMeter = 0;
bmp.YPelsPerMeter = 0;
bmp.ClrUsed = 0;
bmp.ClrImportant = 0;
// Create the bitmap in memory. The "bits" variable will receive a pointer
// to the memory allocated for the bitmap.
IntPtr bits = IntPtr.Zero;
IntPtr hBitmap = CreateDIBSection(IntPtr.Zero, ref bmp, 0, ref bits, IntPtr.Zero, 0);
if (hBitmap == IntPtr.Zero)
{
// There was an error creating the bitmap
J2K_Codec.Close(ref img);
MessageBox.Show("Can't create bitmap - not enough memory?");
}
// Decode the image into the newly created bitmap memory (pointed to by the
// "bits" variable).
this.Cursor = Cursors.WaitCursor;
img.buffer = bits;
img.buffer_bpp = 4;
img.buffer_pitch = img.Width * img.buffer_bpp;
err = J2K_Codec.Decode(ref img, "bmp=1");
if (err == J2K_Error.Success)
{
// Obtain a managed bitmap
Bitmap result = Bitmap.FromHbitmap(hBitmap);
// Show it in the image box
pictureBox.Image = result;
// Resize the window to embrace the image
ResizeWindow(img.Width, img.Height);
}
else
{
// If error then show the error message
MessageBox.Show(J2K_Codec.GetErrStr(err), "Error");
}
// Delete the DIB to release memory
DeleteObject(hBitmap);
// Close the image
J2K_Codec.Close(ref img);
// Restore cursor
this.Cursor = Cursors.Default;
}