winforms pdf 417

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winforms pdf 417

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On the other hand, if PreserveSig is false the return value takes on a whole different process. The first thing you need to be aware of is that the unmanaged function needs to return an HRESULT and have a parameter of type [out, retval]. With this combination the PreserveSig when set to false causes the [out, retval] parameter to be the actual value returned if the HRESULT is equal to S_OK. But if the HRESULT is something else, an exception is thrown and the [out, retval] parameter is discarded. You usually don t have to include the PreserveSig named parameter with a P/Invoked unmanaged function, as it is designed more for COM objects, but this doesn t mean you can t still use it if you are accessing a standard DDL function that uses the HRESULT as a return type and has an [out, retval] parameter.

@synthesize urlPaths, externalWindow, selectedCell;

When SetLastError is set to true, this indicates that the unmanaged function will call SetLastError and the CLR P/Invoke process will call GetLastError to save the error value, preventing any other API function from overwriting this error value as the API stack is walked. You can then get the error using the Marshal::GetLastWinError() within your program. The default value of SetLastError is false.

rules regarding languages such as C and unmanaged C++. Tools like PREfast are designed to catch those areas of potential failure that are outside the realm of unit testing. PREfast (discussed in 13) catches typical unmanaged code errors, such as buffer overflow errors.

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In the first example, you saw the more common usage of P/Invoke: as a global function. It is also possible to declare a P/Invoke unmanaged function as a static method in a class. There really isn t anything special about it just a minor syntax change in the prototype declaration, plus you need to call the method just like any other static member method. Listing 23-4 shows an example of P/Invoke as a static method of the class SimpleClass. The result is identical to the other two previous programs in this chapter, so I won t waste space showing the same figure a third time. Listing 23-4. A Simple P/Invoke As a Static Method #include "stdafx.h" using namespace System; using namespace System::Runtime::InteropServices; ref class SimpleClass { public: [DllImport("NativeCode")] static long square(long value); [DllImport("User32", CharSet=CharSet::Auto)] static int MessageBox(int hWnd, String^ text, String^ caption, unsigned int type); };

int main(array<System::String ^> ^args) { long Squareof4 = SimpleClass::square(4); Console::WriteLine(L"The square of 4 is {0}", Squareof4);

And make sure that resources are properly freed:

In the past several years, Agile Development methodologies have risen in popularity Extreme Programming (XP) is probably the best known Agile Development methodology, and a core tenet of XP is that unit tests are written before the code is written One of the key benefits of writing unit tests first is that you know, without a doubt, when a piece of functionality has been completed, because that s when the test succeeds Because XP is a short-release cycle methodology, coding must often be done as quickly and as accurately as possible The practice of writing unit tests first supports this goal The process of creating tests first (at the construction stage) to validate your application is called testdriven development The methodology of test-driven development follows this path: Write the unit test, write enough code for the test to succeed, and then refactor the code to make it more efficient.

SimpleClass::MessageBox(0, L"Hello World!", L"A Message Box", 0); return 0; } Notice the only change to the code is that the two methods are called within a ref class and you replace extern "C" with static. Oh, and you have to call the static methods prefixed with the class name.

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