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Like the prior function, this one takes two Bitmap arguments, both of which are grayscale images. The first contains the grayscale image B created in the converttogray method. The second bitmap argument C becomes the edges only version of the image. A number of variables D are defined to aid in the edge-detection process. Like the prior function, we have local pointers E to the image data. The Sobel Edge Detection algorithm involves a mathematical operation known as a convolution, which requires initializing a pair of convolution masks F. The convolution must be performed across the entire image G with the exception of the border pixels, which are skipped H. First the calculations are made in the x dimension I and then in the y dimension J. Once the calculations have been performed for a particular pixel, a new value is calculated based on the surrounding pixels and stored in the output image 1). Prior to storing a value, the new pixel value is constrained to be between 0 and 255 1!. You re now ready to compile this code, but before you can do that you need to define the make file for the library.

The variable $result will have the value TRUE if the call succeeded, otherwise it will be FALSE You generally don t need to worry if the call fails as it usually only happens if there is no session to close, which is the situation you wanted anyway

In addition to the C source file, you require a make file to instruct the NDK on how the library is compiled. The following listing contains the make file used with this library.

There are two broad categories of digital inputs First, an input pin on a processor can be connected to an output pin on a second processor (or other electronic device) to implement a connection between the two devices In this case, there are two important considerations: protecting the devices

LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := ua2efindedges LOCAL_SRC_FILES := ua2efindedges.c LOCAL_LDLIBS := -llog ljnigraphics include $(BUILD_SHARED_LIBRARY)

function PIPHP_CloseSession() { $_SESSION = array(); if (session_id() != "" || isset($_COOKIE[session_name()])) setcookie(session_name(), '', time() - 2592000, '/'); return @session_destroy(); }

The Android.mk file is a make file containing build information about the JNI library for this project. The name of the library module is ua2efindedges. The actual resulting filename is libua2efindedges.so, which follows the normal file-naming structure for a dynamically loadable library for Linux. The only source file for this library is ua2efindedges.c. The input libraries are also listed. These libraries are searched for code symbols when the library is linked. The standard C and math libraries are automatically searched, so they don t need to be included in the LOCAL_LDLIBS variable. Building the application is as simple as opening a terminal window to the jni folder and running the file ndk-build, which can be found in the NDK installation directory. Figure 19.7 shows the build process from the command line.

If there s a way a hacker can break into your web site, you can bet they ll try One trick they use is to hijack PHP sessions This might be achieved in different ways, but the main security hole is when a hacker locates a site that passes the session ID in a GET URL tail Given this information, a hacker could start a session and then pass on the URL (including the session ID) in spam or other links They could then go back and look for evidence of any of these links having being followed and, if the user hasn t logged out, they may be able to hijack the session and assume the user s identity But by using this simple plug-in, tricks of that nature are rendered completely useless Figure 9-8 shows a session that is opened with PIPHP_OpenSession() and then tested for security with this plug-in

5

Now that the JNI library is complete, let s swing back to the Android SDK and build the user interface for this application.

9:

The UI for the application is modest. The things the UI must do include responding to two different buttons, one for taking a picture and one for calling the JNI functions. Beyond that, the code performs simple operations to display the various bitmap images. Let s start by looking at the layout for this application.

size (five traces with six holes each)