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In some applications, you may need to retrieve the contents of a directory. There are functions provided by C that can do this, but a much easier method is to use GLib s GDir structure. Listing 6-6 shows you how to read the full contents of the user s home directory and print them to the screen. Listing 6-6. Get the Contents of a Directory (directories.c) #include <glib.h> int main (int argc, char *argv[]) { /* Open the user's home directory for reading. */ GDir *dir = g_dir_open (g_get_home_dir (), 0, NULL); const gchar *file; if (!g_file_test (g_get_home_dir (), G_FILE_TEST_IS_DIR)) g_error ("Error: You do not have a home directory!"); while ((file = g_dir_read_name (dir))) g_print ("%s\n", file); g_dir_close (dir); return 0; } Directories are opened with g_dir_open(). The first parameter of the function specifies the directory to open. The second parameter of g_dir_open() is reserved for future use and should be set to 0 at this time. The last parameter returns a GError, although you will know if the function fails, because NULL is returned if the directory was not successfully loaded. while ((file = g_dir_read_name (dir))) g_print ("%s\n", file);

This example of using partial classes works, but should, never, never I say NEVER be used. The problem is that partial classes solve a different problem, which relates to code generation. Using partial classes in this context results in a class that is included in multiple assemblies with a different signature. This could be considered dynamically changing polymorphism, which isn t object oriented, and just plain wrong. So don t do it! This admonition may seem out of place in this book, as I m usually not so harsh. However, what bothers me is that once I saw a presenter illustrate a technique similar to what I explained, and that person thought it was a cool way to use partial classes. Wrong, it isn t a cool way!

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A simple while loop can be used to retrieve all of the files and folders in the directory. This list is returned one element at a time with g_dir_read_name() in the order the elements appear on the disk. NULL is returned when no more entries exist. You must not free the returned string, because it is owned by GLib.

class __declspec(dllexport) NativeClass { private: int m_member;

The producer-consumer technique has never been defined as a pattern, but is used very often. It has some similarities to the Observer pattern, but doesn t include the asynchronous callback. The producer-consumer technique is more generalized than the Pipes and Filters pattern outlined in 4. The difference is that the producer-consumer technique is simpler in scope and context. This raises the question as to whether or not to cover the producer-consumer, and the answer is yes, the reason being the producer-consumer is the counterpart to the reader-writer. The reader-writer technique is very useful, but is geared towards synchronization scenarios where the data is mostly read. It s possible to use the reader-writer in a scenario of less read and more write, but that would cause a slowdown of the overall implementation, as there would be more writer lock wait times.

Note When using g_dir_read_name(), the "." and ".." file entries will not be returned, since they are

If you need to return to the first entry in the list in order to loop through the entries again, g_dir_rewind() should be called on the GDir object. This will reset the structure so that it again points to the first file or folder. When you are finished with the GDir object, you should always call g_dir_close() to deallocate the GDir and free all of its related resources.

public: NativeClass() : m_member(1) { } int F( int i ) { // __FUNCSIG__ is a compiler-defined macro evaluating // to the current function signature. printf("%s\n", __FUNCSIG__); return m_member + i; } static NativeClass* CreateObject() { printf("%s\n", __FUNCSIG__); return new NativeClass(); } static void DeleteObject(NativeClass* p) { printf("%s\n", __FUNCSIG__); delete p; } }; // If you do not want to use the obfuscated names, you can use these exports: extern "C" __declspec(dllexport) NativeClass* CreateObject() { return NativeClass::CreateObject(); } extern "C" __declspec(dllexport) void DeleteObject(NativeClass* p) { NativeClass::DeleteObject(p); } /* The mangled names were obtained by running the command link /DUMP /EXPORTS nativeclasslib.dll which outputs: ordinal hint RVA name

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