1. wxProcess changes to make capturing subprocess output easier (and more

[wxWidgets.git] / include / wx / dynlib.h

diff --git a/include/wx/dynlib.h b/include/wx/dynlib.h
index 0419db3579b7d0c287a1f652b6a1a3bd5c379839..313180829c1f24ce3adf377abcf06c6b9fa46b1d 100644 (file)
--- a/include/wx/dynlib.h
+++ b/include/wx/dynlib.h
@@ -13,45 +13,92 @@
 #define _WX_DYNLIB_H__
 
 #ifdef __GNUG__
-    #pragma interface
+#   pragma interface
 #endif
 
-#include <wx/string.h>
-#include <wx/list.h>
-#include <wx/hash.h>
-
-// TODO should be done by configure
-#if defined(__UNIX__) && !(defined(HAVE_DLOPEN) || defined(HAVE_SHLLOAD))
-    #if defined(__LINUX__) || defined(__SOLARIS__) || defined(__SUNOS__) || defined(__FREEBSD__)
-        #define HAVE_DLOPEN
-    #elif defined(__HPUX__)
-        #define HAVE_SHLLOAD
-    #endif // Unix flavour
-#endif // !Unix or already have some HAVE_xxx defined
+#include "wx/setup.h"
 
-#if defined(HAVE_DLOPEN)
-    #include <dlfcn.h>
+#if wxUSE_DYNLIB_CLASS
 
-    typedef void *wxDllType;
-#elif defined(HAVE_SHLLOAD)
-    #include <dl.h>
+#include "wx/string.h"
+#include "wx/list.h"
+#include "wx/hash.h"
+
+// this is normally done by configure, but I leave it here for now...
+#if defined(__UNIX__) && !(defined(HAVE_DLOPEN) || defined(HAVE_SHL_LOAD))
+#   if defined(__LINUX__) || defined(__SOLARIS__) || defined(__SUNOS__) || defined(__FREEBSD__)
+#      define HAVE_DLOPEN
+#   elif defined(__HPUX__)
+#      define HAVE_SHL_LOAD
+#   endif // Unix flavour
+#endif // !Unix or already have some HAVE_xxx defined
 
+// Note: WXPM/EMX has to be tested first, since we want to use
+// native version, even if configure detected presence of DLOPEN.
+#if defined(__WXPM__) || defined(__EMX__)
+#   define INCL_DOS
+#   include <os2.h>
+    typedef HMODULE wxDllType;
+#elif defined(HAVE_DLOPEN)
+#   include <dlfcn.h>
     typedef void *wxDllType;
+#elif defined(HAVE_SHL_LOAD)
+#   include <dl.h>
+    typedef shl_t wxDllType;
 #elif defined(__WINDOWS__)
-    #include <windows.h>
-
+#   include <windows.h>         // needed to get HMODULE
     typedef HMODULE wxDllType;
 #elif defined(__WXMAC__)
     typedef CFragConnectionID wxDllType;
 #else
-    #error "wxLibrary can't be compiled on this platform, sorry."
+#   error "wxLibrary can't be compiled on this platform, sorry."
 #endif // OS
 
-// defined in windows.h
-#ifdef LoadLibrary
-    #undef LoadLibrary
+// LoadLibrary is defined in windows.h as LoadLibraryA, but wxDllLoader method
+// should be called LoadLibrary, not LoadLibraryA or LoadLibraryW!
+#if defined(__WIN32__) && defined(LoadLibrary)
+#   include "wx/msw/winundef.h"
 #endif
 
+// ----------------------------------------------------------------------------
+// wxDllLoader
+// ----------------------------------------------------------------------------
+
+/** wxDllLoader is a class providing an interface similar to unix's
+    dlopen(). It is used by the wxLibrary framework and manages the
+    actual loading of DLLs and the resolving of symbols in them.
+    There are no instances of this class, it simply serves as a
+    namespace for its static member functions.
+*/
+class wxDllLoader
+{
+public:
+    /** This function loads a shared library into memory, with libname
+      being the basename of the library, without the filename
+      extension. No initialisation of the library will be done.
+      @param libname Name of the shared object to load.
+      @param success Must point to a bool variable which will be set to TRUE or FALSE.
+      @return A handle to the loaded DLL. Use success parameter to test if it is valid.
+     */
+    static wxDllType LoadLibrary(const wxString & libname, bool *success = NULL);
+    /** This function unloads the shared library. */
+    static void UnloadLibrary(wxDllType dll);
+    /** This function returns a valid handle for the main program
+      itself. */
+    static wxDllType GetProgramHandle(void);
+    /** This function resolves a symbol in a loaded DLL, such as a
+      variable or function name.
+      @param dllHandle Handle of the DLL, as returned by LoadDll().
+      @param name Name of the symbol.
+      @return A pointer to the symbol.
+     */
+    static void * GetSymbol(wxDllType dllHandle, const wxString &name);
+
+private:
+    /// forbid construction of objects
+    wxDllLoader();
+};
+
 // ----------------------------------------------------------------------------
 // wxLibrary
 // ----------------------------------------------------------------------------
@@ -62,7 +109,7 @@ public:
     wxHashTable classTable;
 
 public:
-    wxLibrary(void *handle);
+    wxLibrary(wxDllType handle);
     ~wxLibrary();
 
     // Get a symbol from the dynamic library
@@ -77,6 +124,8 @@ protected:
     wxDllType m_handle;
 };
 
+
+
 // ----------------------------------------------------------------------------
 // wxLibraries
 // ----------------------------------------------------------------------------
@@ -112,4 +161,6 @@ wxClassInfo *wxGetClassFirst() { \
   return wxClassInfo::GetFirst(); \
 }
 
+#endif // wxUSE_DYNLIB_CLASS
+
 #endif // _WX_DYNLIB_H__