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The following example demonstrates the steps needed to modify the IL for a COM component. The method we will modify is the same one used in the previous recipe. The COM method is defined like this: [id(2), helpstring("method GetTheResult")] HRESULT GetTheResult([in] long request); The first step is to create an import library for this COM component. To do this, we use the TlbImp command-line utility like this: tlbimp.exe DniComResults.dll /out:Interop.DniComResults.dll

It needs to be of type long so that it can hold a large enough value for the program to run for a reasonable amount of time without the value exceeding the storage capacity of the variable and wrapping back around to 0..

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This generates an interop library named Interop.DniComResults.dll. If we were to use this interop library as is, we would see that the COM method is defined like this: void GetTheResult(int request) The HRESULT is thrown away, making it impossible to check within managed code. To remedy this situation, we extract the IL code for this interop assembly, make a few minor modifications, and then re-create the assembly. To disassemble the interop assembly, we use the Ildasm command-line utility like this: ildasm.exe Interop.DniComResults.dll /out:DniComResults.il This generates a text file named DniComResults.il. Opening the file in Visual Studio, we search for the GetTheResult method in the IL code and see that it is defined like this: instance void GetTheResult([in] int32 'request') runtime managed internalcall We need to modify this method so that it returns an int32 (the HRESULT) instead of void. We also need to add the preservesig attribute so that the original signature of the COM method is preserved. Our changes look like this: instance int32 GetTheResult([in] int32 'request') runtime managed internalcall preservesig

add watermark image to pdf using itextsharp c#

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add watermark to pdf using itextsharp c#

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unsigned long oldTime; The setup routine is fairly straightforward except for the definition of the interrupt handler, which we'll get to in a moment First it makes some calls to methods in the lcd object The begin call specifies the number of columns and rows in the attached LCD, then the cursor is set to character 0 on row 0 (the top row) before 16 spaces are printed The cursor is then set to character 0 on row 1 (the second row) and another 16 spaces printed This ensures that the LCD starts off blank with no leftover characters visible on the display Normally it's not a problem, but this just ensures that anything left from a previous program you may have run, such as an LCD test program, is erased void setup() { lcdbegin(16, 2); lcdsetCursor(0, 0); lcdprint(" "); lcdsetCursor(0, 1); lcd.

INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

Caution In the IL file, this method is defined twice: once for the COM interface and once for the method

print(" "); A serial connection is then opened to the host to report values back Serialbegin(38400); The pin to control the status LED is switched to an output and then set HIGH, which turns off the LED since we connected it via a dropper resistor to +5V pinMode(statusLed, OUTPUT); digitalWrite(statusLed, HIGH); The I/O lines connected to the counter reset buttons are set as inputs so we can read the button state, but then the program writes to them as if they're outputs This has the effect of activating the ATMega CPU's internal 20K pull-up resistors on those inputs, biasing them high unless they are pulled low via the button and the 1K resistors pinMode(resetButtonA, INPUT); digitalWrite(resetButtonA, HIGH); pinMode(resetButtonB, INPUT); digitalWrite(resetButtonB, HIGH); The pin for connecting the Hall-effect sensor is then treated in the same way.

implementation within the COM class. We need to make the same change to both locations in order for this code to work correctly.

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add watermark image to pdf using itextsharp c#

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add watermark image to pdf using itextsharp c#

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add watermark image to pdf using itextsharp c#

add watermark to pdf using itextsharp c#