How can I call PDFStampCom from C# code?

Thanks for the SDK link, however the example files are not working. Please see the attached document.

When I call PDFStamp SDK from C# code, I'm get following error message,

Argument Null Exception was unhandled.

The following is the source code for PDFStamp SDK product,

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using PDFStampCom;

using System.IO;

namespace WindowsFormsApplication1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

int Very_Set_Range = 131;

int Very_Set_Opacity = 240;

int Very_Get_Opacity = 240;

int Very_Get_PdfPageCount = 206;

int Very_Get_PageBoxForStamp = 260;

int Very_Set_EmbedFont = 241;

int Very_Get_EmbedFont = 241;

int Very_Set_TransparentColor = 242;

private void PDFStamp_Click(object sender, EventArgs e)

{

string strPDFFile;

string strOutFile;

int id;

string appPath = Path.GetDirectoryName(Application.ExecutablePath);

strPDFFile = appPath + "\\example.pdf";

strOutFile = appPath + "\\C#-com-test.pdf";

System.Type pdfstampType = System.Type.GetTypeFromProgID
("PDFStampCom.CPDFStamp");

PDFStampCom.CPDFStamp pdfstamp = (PDFStampCom.CPDFStamp)
System.Activator.CreateInstance(pdfstampType);

//id = pdfstamp.veryOpenEx(strPDFFile, strOutFile);

id = pdfstamp.VeryStampLayerOpenEx(strPDFFile, strOutFile,
"PDFManWatermark_Overlayer", "PDFManWatermark_Underlayer");

if (id > 0)

{

int pagecount = pdfstamp.veryGetFunctionEx(id, Very_Get_PdfPageCount,
0, 0, null, null);

for (int Page = 1; Page <= pagecount; Page++)

{

string strStampBuf;

long left, top, pagewidth, pageheight;

left = pdfstamp.veryGetFunctionEx(id, Very_Get_PageBoxForStamp,
Page, 0, "left", null);

top = pdfstamp.veryGetFunctionEx(id, Very_Get_PageBoxForStamp,
Page, 0, "top", null);

pagewidth = pdfstamp.veryGetFunctionEx(id, Very_Get_PageBoxForStamp,
Page, 0, "width", null);

pageheight = pdfstamp.veryGetFunctionEx(id, Very_Get_PageBoxForStamp,
Page, 0, "height", null);

//We need to control which pages the stamp goes on

int iRet = pdfstamp.verySetFunctionEx(id, Very_Set_Range, Page,
1, null, null);

                    strStampBuf = "Page:" + (pagecount - Page + 1).ToString() +
                           ", Page Box: [" + left.ToString() + " " + top.ToString() + " "
                           + pagewidth.ToString() + " " + pageheight.ToString() + "]";

//*'*/Not embed TTF font for general text stamp

iRet = pdfstamp.verySetFunctionEx(id, Very_Set_EmbedFont, 0, 0,
null, null);

iRet = pdfstamp.veryAddTextEx(id, 2, strStampBuf, 255, 0, 0, 0, 0,
0, 0, 300, null, 10, 1, "https://www.verypdf.com", 0);

//*'*/Embed special TTF font into PDF file, we can to use any TTF font

iRet = pdfstamp.verySetFunctionEx(id, Very_Set_EmbedFont, 1, 0,
null, null);

iRet = pdfstamp.veryAddTextEx(id, 1, "0123456789", 0, 0, 0, 0, 0,
0, 0, 0, "Code-39-20", 8, 1, "https://www.verypdf.com/", 0);

}

pdfstamp.veryCloseEx(id);

pdfstamp.VeryStampEncryptPDFEx(strOutFile, strOutFile + "-encrypted.pdf",
null, "123", 2, 3900);

}

private void button1_Click(object sender, EventArgs e)

{

string strPDFFile;

string strOutFile;

int id;

string appPath = Path.GetDirectoryName(Application.ExecutablePath);

strPDFFile = appPath + "\\example.pdf";

strOutFile = appPath + "\\C#-com-barcode.pdf";

System.Type pdfstampType = System.Type.GetTypeFromProgID
("PDFStampCom.CPDFStamp");

PDFStampCom.CPDFStamp pdfstamp = (PDFStampCom.CPDFStamp)
System.Activator.CreateInstance(pdfstampType);

id = pdfstamp.veryOpenEx(strPDFFile, strOutFile);

if (id > 0)

{

int pagecount = pdfstamp.veryGetFunctionEx(id, Very_Get_PdfPageCount, 0,
0, null, null);

for (int Page = 1; Page <= pagecount; Page++)

{

string strStampBuf;

long left, top, pagewidth, pageheight;

left = pdfstamp.veryGetFunctionEx(id, Very_Get_PageBoxForStamp,
Page, 0, "left", null);

top = pdfstamp.veryGetFunctionEx(id, Very_Get_PageBoxForStamp, Page,
0, "top", null);

pagewidth = pdfstamp.veryGetFunctionEx(id, Very_Get_PageBoxForStamp,
Page, 0, "width", null);

pageheight = pdfstamp.veryGetFunctionEx(id, Very_Get_PageBoxForStamp,
Page, 0, "height", null);

//We need to control which pages the stamp goes on

int iRet = pdfstamp.verySetFunctionEx(id, Very_Set_Range, Page,
1, null, null);

                    strStampBuf = "Page:" + (pagecount - Page + 1).ToString() +
                          ", Page Box: [" + left.ToString() + " " + top.ToString() + " "
                          + pagewidth.ToString() + " " + pageheight.ToString() + "]";

//*'*/Not embed TTF font for general text stamp

iRet = pdfstamp.verySetFunctionEx(id, Very_Set_EmbedFont, 0, 0,
null, null);

iRet = pdfstamp.veryAddTextEx(id, 2, strStampBuf, 255, 0, 0, 0, 0,
0, 0, 300, null, 10, 1, "https://www.verypdf.com", 0);

//*'*/Embed special TTF font into PDF file, we can to use any TTF font

iRet = pdfstamp.verySetFunctionEx(id, Very_Set_EmbedFont, 1, 0,
null, null);

string strFontName = "Free 3 of 9";

iRet = pdfstamp.veryAddTextEx(id, 1, "0123456789", 0, 0, 0, 0, 0,
0, 0, 0, strFontName, 8, 1, "https://www.verypdf.com/", 0);

}

pdfstamp.veryCloseEx(id);

}

Customer
-------------------------------------
Have you already registered the "PDFStampCom.exe" COM component? if not, you can run "bin/install_for_x64.bat" to register PDFStampCom.exe first, you need run it with administrator right, you can also run following command line to register it by manual,

PDFStampCom.exe /regserver