c# add watermark to existing pdf file using itextsharp

How To Add Watermark On PDF Files - C# Corner
23 Sep 2015 ... Image watermark is a good choice to beautify PDF files since it fills the background with colorful and distinctive pictures, then how to add a ...

The SpeakJet works by varying the duty cycle of a fixed 32KHz frequency pulse-width modulated (PWM) "carrier" from pin 18 into an external two-pole low-pass filter, successfully converting the PWM digital signal into an analog voltage waveform suitable for line output or audio amplifiers. Done fast enough, what this means is that the duty cycle percentage of the PWM signal converts to the same percentage of DC voltage output from the filter, so a 50% 0 to 5V PWM duty cycle will convert to about 2.5 volts DC out of the filter.

The code to execute this version looks exactly the same, except for the change we made to the description: StringBuilder buf = new StringBuilder(255); int size = buf.Capacity; GetComputerName(buf, ref size); Console.WriteLine("GetComputerNameUnicode: {0}, {1}", buf.ToString(), size);

add watermark text to pdf using itextsharp c#

watermark (text or image) in existing pdf - Stack Overflow
23 May 2017 ... The following is inspired by 'iText in Action - 2nd Edition' by Bruno Lowagie. I am using iTextSharp version 5.4. The code below adds both a text watermark and ...

pdf watermark c#

Using iTextSharp To Watermark /Write Text To Existing PDF's ...
11 May 2008 ... First off, yes, I know there are other tutorials on how to watermark PDF's with iTextSharp . Unfortunately none of them showed me exactly what I ...

This is a great, inexpensive way to generate analog voltages and waveforms from any microcontroller PWM output, and is used in many projects to get a DAC voltage (Digital-AnalogConversion) output without special hardware. The raw PWM from SpeakJet output pin 18 is digital and sounds somewhat noisy, but intelligible speech can still be heard. There is a 120-ohm minimum load and 25mA maximum current specified for this pin; be careful not to connect anything that may load the output pin more than this and risk damage to the IC.

The declaration of GetComputerName using the Unicode version looks like this in Visual Basic .NET (VB.NET): <DllImport("kernel32.DLL", _ CharSet:=CharSet.Unicode, ExactSpelling:=False)> _ Public Shared Function GetComputerName( _ ByVal computerName As StringBuilder, _ ByRef size As Integer) As Boolean End Function

Tip An open case makes an excellent place to keep notes to yourself about what needs to be done to close

A simple way to test that everything is working up to this point is to connect a pair of powered computer speakers directly to the SpeakJet output pin 18. We placed a header on pin 18 just for this purpose, though this quick test and the header can be skipped if you'd like to move straight on to the more useful filtered audio line output. It's only a few more parts, and the same cable can be used. For the quick test, connect a 3.5mm stereo headphone socket to the pin header as shown in Figure 9-4. The SpeakJet is a single mono output, so we connect it to both the left and right channels on the socket.

Note In VB.NET, the Shared keyword is used to declare a static function. If you apply the DllImport

Figure 9-4. Connection from header to powered computer speakers At this point you could mount the shield on your Arduino, plug in some powered speakers or earbuds, and proceed to the software section to test that it works.

attribute to a function that is declared within a class, the function must be declared with the Shared keyword. However, if the function is declared within a VB.NET module instead of a class, the Shared keyword is not appropriate.

You certainly don't need status indicators for the speech synthesizer to operate, but it can be handy to have visual feedback of what the chip is doing. Pins 15, 16, and 17 operate as status outputs when the SpeakJet is in normal operation, so by connecting three LEDs with matching dropper resistors we can see exactly what it's up to. These pins can also be connected to the Arduino so that the software can monitor the SpeakJet speech operation. The status pins, as shown from left to right in Figure 9-5, are described in Table 9-1.

add watermark to pdf c#

Adding Image watermark to Pdf while Creating it using iTextSharp ...
This is essentially identical to adding a header or footer. ... Note: Unless your image is mostly transparent , drawing it on top of your page will ...