need help in saving Page as Image

[kodapala]

Hi everyone,
I have just started exploring foxit sdk for my needs(read, display, zoom, rotate, magnify, SAVE etc.)

I am using foxit dll from vb.net 2003 as well as 2005.
i have successfully managed to display the image in a picturebox with the help of code posted by Williams.

it is very very fast & simple,

Furthur i want to be able to save pdf page as a image into some location on the machine and use it later.

following is the code i tried to save a page

'-------------code
'code to load
Dim pdf_doc As Integer = Foxit.FPDFView.FPDF_LoadDocument("c:\test.pdf", "")
pdf_page = Foxit.FPDFView.FPDF_LoadPage(pdf_doc, 0)

Dim page_width As Integer = Foxit.FPDFView.FPDF_GetPageWidth(pdf_page)
Dim page_height As Integer = Foxit.FPDFView.FPDF_GetPageHeight(pdf_page)
'---> successful till here

Dim hdc2, hMemDC, hbitmap As IntPtr
hMemDC = Foxit.FPDFView.CreateCompatibleDC(hdc2)

hbitmap = Foxit.FPDFView.CreateCompatibleBitmap(hdc2, page_width, page_height) '-----> this line is always returning 0 for hbitmap

hbitmap = Foxit.FPDFView.SelectObject(hMemDC, hbitmap)

Foxit.FPDFView.FPDF_RenderPage(hMemDC, pdf_page, 0, 0, page_width, page_height, 0, 0)

hbitmap = Foxit.FPDFView.SelectObject(hMemDC, hbitmap)

Dim img As Image = Image.FromHbitmap(hbitmap)
img.Save("C:\\tryFoxit2.bmp", ImageFormat.Bmp)
MessageBox.Show("Image Successfully saved")
'--------------- end code

the code fails at Dim img As Image = Image.FromHbitmap(hbitmap) saying
System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.
at System.Drawing.Image.FromHbitmap(IntPtr hbitmap, IntPtr hpalette)
at System.Drawing.Image.FromHbitmap(IntPtr hbitmap)
at tryThumbNails.frmFoxit.button1_Click(Object sender, EventArgs e) in
......................


Thanks in advance
loks

[jcreynol]

Did you have any success finding a fix for this error?

[wanli_zi]

Dim hdc2, hMemDC, hbitmap As IntPtr

//here you need creat the DC first

hMemDC = Foxit.FPDFView.CreateCompatibleDC(hdc2)

hbitmap = Foxit.FPDFView.CreateCompatibleBitmap(hdc2, page_width, page_height) '-----> this line is always returning 0 for hbitmap

hbitmap = Foxit.FPDFView.SelectObject(hMemDC, hbitmap)