Hi, i'm trying to use pdf as a container of images. I need to extract the raw bit data. I'm using the following code:
static void ExportAsPngImage(PdfDictionary image, ref int count)
{
int width = image.Elements.GetInteger(PdfImage.Keys.Width);
int height = image.Elements.GetInteger(PdfImage.Keys.Height);
int bitsPerComponent = image.Elements.GetInteger(PdfImage.Keys.BitsPerComponent);
if (image.Stream != null)
{
System.Drawing.Imaging.PixelFormat pf = PixelFormat.Format1bppIndexed;//GetPixelFormat(bitsPerComponent);
if (pf != System.Drawing.Imaging.PixelFormat.Undefined)
{
byte[] stream = image.Stream.UnfilteredValue;
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(
width,
height,
pf);
//Lock the bitmap's bits
System.Drawing.Rectangle rect = new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height);
System.Drawing.Imaging.BitmapData bmpData =
bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite,
bmp.PixelFormat);
//Get the address of the first line
IntPtr ptr = bmpData.Scan0;
....
if (pf == System.Drawing.Imaging.PixelFormat.Format1bppIndexed)
{
if (bmpData.Stride == width)
{
Marshal.Copy(stream, 0, ptr, width * height /
;}
else
{
for (int i = 0; i < bmp.Height; i++)
{
IntPtr p = new IntPtr(ptr.ToInt32() + bmpData.Stride * i);
Marshal.Copy(stream, i * bmp.Width / 8, p, bmp.Width /
;}
}}}}}
I get something like an image, but there must be sth wrong, because with 24bpp images it works fine.
I attach the pdf and the image extracted, when this code added to ExportImages Project in the Examples!
Thank you for your time!
The smiles in code are eights plus ')';
| Attachments: |
Mono.zip [2.1 KiB]
Downloaded 401 times |