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This function receives a file or directory name as well as the type of test to perform It returns TRUE if the test was successful and FALSE if it was not Test parameters are provided by the following GFileTest enumeration: G_FILE_TEST_IS_REGULAR: The file is not a symbolic link or a directory, which means that it is a regular file G_FILE_TEST_IS_SYMLINK: The file you specified is actually a symbolic link G_FILE_TEST_IS_DIR: The path points to the location of a directory G_FILE_TEST_IS_EXECUTABLE: The specified file is executable G_FILE_TEST_EXISTS: Some type of object exists at the specified location However, this test does not determine whether it is a symbolic link, a directory, or a regular file It is possible to perform multiple tests at the same time by using a bitwise operation For example, (G_FILE_TEST_IS_DIR | G_FILE_TEST_IS_REGULAR) will return TRUE if the path points to a directory or a regular file..

The two would be an ideal combination because a flyweight creates references to commonly used objects A flyweight is instantiated multiple times, and therefore there would still be multiple instances Combining the Singleton pattern with a Flyweight pattern would result in a multiple-instance-typed singleton How Not to Solve an Unknown Implementation Problem In C# 20, it s possible to use partial classes One of the problems with a singleton is how to define an implementation that specifies the factory for the singleton without using an external configuration file One possible solution would be to use partial classes as illustrated by the following example: namespace HowNotToSolve { interface ISingletonBuilder { } partial class Singleton { private static ISingletonBuilder _builder; static Singleton() { _builder = SingletonGetMyBuilder(); } } partial class Singleton { class MySingletonBuilder : ISingletonBuilder { } static ISingletonBuilder GetMyBuilder() { return new MySingletonBuilder(); } } }.

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The size of IntPtr is dependent on the pointer size for the platform, so it can represent a 32-bit pointer or a 64-bit pointer It can be converted easily to a 32-bit or 64-bit integer or to an untyped pointer (void *) The IntPtr type may be used to hold values of native OS handles (such as an HWND) and pointers obtained from other P/Invoke calls If the function you want to import has a name conflict with one you re already using, you can use the EntryPoint property on DllImport to specify the desired native function, and then name the function something else that won t conflict, as in Listing 13-7..

There are a few cases with symbolic links in which you need to take caution. First, all tests will follow through symbolic links. So, G_FILE_TEST_IS_REGULAR will return TRUE if a symbolic link points to a regular file. You should be careful when using g_file_test() to test whether it is safe to perform some type of action on a file or directory. The state of the file may change before you perform the action, so you can never be sure whether the action was acceptable until after it has been performed. This is why it is a good idea to check G_FILE_ERROR_EXIST in the returned GError.

Listing 13-7. Using DllImport s EntryPoint Property // pinvoke_rename_entry_point.cpp #using "System.Windows.Forms.dll" using namespace System; using namespace System::Runtime::InteropServices; using namespace System::Windows::Forms; [DllImport("user32.dll", CharSet=CharSet::Auto, EntryPoint="MessageBox")] int NativeMessageBox(IntPtr, String^ text, String^ caption, unsigned int type); int main() { NativeMessageBox(IntPtr::Zero, "Hello, World!", "Win32 Message Box", 0); MessageBox::Show("Hello, Universe!", "Managed Message Box"); } In general, with P/Invoke, you should be sure that you know the calling convention of the target function. As long as you are calling Win32 functions, you don t need to worry about the calling convention used, because all Win32 functions use the __stdcall calling convention (WINAPI in the Windows headers evaluates to this), and that is the default for DllImport. However, if you are using your own native DLL compiled with Visual C++, for which the default calling convention is __cdecl, you may need to set the CallingConvention property on the DllImport attribute. For example, you need to set the CallingConvention to CallingConvention::Cdecl if you are calling any CRT function via P/Invoke. The Bessel functions are not available in the .NET Framework API, so you could expose them from the CRT via the following declaration: [DllImport("msvcr90.dll", CallingConvention=CallingConvention.Cdecl)] extern double _jn(int n, double x); // Bessel function of the first kind This code would be useful in safe mode only, since in pure mode you can call CRT functions directly using the managed CRT. The CallingConvention property can be used to call a method on a class that is exported from a DLL. Let s look at this possibility in Listings 13-8 and 13-9. Listing 13-8. Compiling a Native Class into a DLL // nativeclasslib.cpp // Compile with cl /LD nativeclasslib.cpp. #include <stdio.h>

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