X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/dee1a63ff52bfe4da396187f8438aa1a29796737..3039ade95dbad1ee5a5ed03c25e3ed9241907850:/include/wx/dynlib.h

diff --git a/include/wx/dynlib.h b/include/wx/dynlib.h
index 85be309e87..3d31beeb80 100644
--- a/include/wx/dynlib.h
+++ b/include/wx/dynlib.h
@@ -27,11 +27,12 @@
 #include "wx/msw/private.h"
 #endif
 
-#if defined(HAVE_DLERROR) && !defined(__EMX__)
+// note that we have our own dlerror() implementation under Darwin
+#if (defined(HAVE_DLERROR) && !defined(__EMX__)) || defined(__DARWIN__)
     #define wxHAVE_DYNLIB_ERROR
 #endif
 
-class WXDLLIMPEXP_BASE wxDynamicLibraryDetailsCreator;
+class WXDLLIMPEXP_FWD_BASE wxDynamicLibraryDetailsCreator;
 
 // ----------------------------------------------------------------------------
 // conditional compilation
@@ -41,14 +42,15 @@ class WXDLLIMPEXP_BASE wxDynamicLibraryDetailsCreator;
 // native version, even if configure detected presence of DLOPEN.
 #if defined(__OS2__) || defined(__EMX__) || defined(__WINDOWS__)
     typedef HMODULE             wxDllType;
+#elif defined(__DARWIN__)
+    // Don't include dlfcn.h on Darwin, we may be using our own replacements.
+    typedef void               *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(__DARWIN__)
-    typedef void               *wxDllType;
 #elif defined(__WXMAC__)
     #include <CodeFragments.h>
     typedef CFragConnectionID   wxDllType;
@@ -71,9 +73,19 @@ enum wxDLFlags
     wxDL_VERBATIM   = 0x00000008,   // attempt to load the supplied library
                                     // name without appending the usual dll
                                     // filename extension.
+
+    // this flag is obsolete, don't use
     wxDL_NOSHARE    = 0x00000010,   // load new DLL, don't reuse already loaded
                                     // (only for wxPluginManager)
 
+    wxDL_QUIET      = 0x00000020,   // don't log an error if failed to load
+
+    // this flag is dangerous, for internal use of wxMSW only, don't use
+    wxDL_GET_LOADED = 0x00000040,   // Win32 only: return handle of already
+                                    // loaded DLL or NULL otherwise; Unload()
+                                    // should not be called so don't forget to
+                                    // Detach() if you use this function
+
     wxDL_DEFAULT    = wxDL_NOW      // default flags correspond to Win32
 };
 
@@ -104,6 +116,63 @@ enum wxPluginCategory
 #define wxDYNLIB_FUNCTION(type, name, dynlib) \
     type pfn ## name = (type)(dynlib).GetSymbol(_T(#name))
 
+
+// a more convenient function replacing wxDYNLIB_FUNCTION above
+//
+// it uses the convention that the type of the function is its name suffixed
+// with "_t" but it doesn't define a variable but just assigns the loaded value
+// to it and also allows to pass it the prefix to be used instead of hardcoding
+// "pfn" (the prefix can be "m_" or "gs_pfn" or whatever)
+//
+// notice that this function doesn't generate error messages if the symbol
+// couldn't be loaded, the caller should generate the appropriate message
+#define wxDL_INIT_FUNC(pfx, name, dynlib) \
+    pfx ## name = (name ## _t)(dynlib).RawGetSymbol(#name)
+
+#ifdef __WXMSW__
+
+// same as wxDL_INIT_FUNC() but appends 'A' or 'W' to the function name, see
+// wxDynamicLibrary::GetSymbolAorW()
+#define wxDL_INIT_FUNC_AW(pfx, name, dynlib) \
+    pfx ## name = (name ## _t)(dynlib).GetSymbolAorW(#name)
+
+#endif // __WXMSW__
+
+// the following macros can be used to redirect a whole library to a class and
+// check at run-time if the library is present and contains all required
+// methods
+//
+// notice that they are supposed to be used inside a class which has "m_ok"
+// member variable indicating if the library had been successfully loaded
+
+// helper macros constructing the name of the variable storing the function
+// pointer and the name of its type from the function name
+#define wxDL_METHOD_NAME(name) m_pfn ## name
+#define wxDL_METHOD_TYPE(name) name ## _t
+
+// parameters are:
+//  - rettype: return type of the function, e.g. "int"
+//  - name: name of the function, e.g. "foo"
+//  - args: function signature in parentheses, e.g. "(int x, int y)"
+//  - argnames: the names of the parameters in parentheses, e.g. "(x, y)"
+//  - defret: the value to return if the library wasn't successfully loaded
+#define wxDL_METHOD_DEFINE( rettype, name, args, argnames, defret ) \
+    typedef rettype (* wxDL_METHOD_TYPE(name)) args ; \
+    wxDL_METHOD_TYPE(name) wxDL_METHOD_NAME(name); \
+    rettype name args \
+        { return m_ok ? wxDL_METHOD_NAME(name) argnames : defret; }
+
+#define wxDL_VOIDMETHOD_DEFINE( name, args, argnames ) \
+    typedef void (* wxDL_METHOD_TYPE(name)) args ; \
+    wxDL_METHOD_TYPE(name) wxDL_METHOD_NAME(name); \
+    void name args \
+        { if ( m_ok ) wxDL_METHOD_NAME(name) argnames ; }
+
+#define wxDL_METHOD_LOAD(lib, name) \
+    wxDL_METHOD_NAME(name) = \
+        (wxDL_METHOD_TYPE(name)) lib.GetSymbol(#name, &m_ok); \
+    if ( !m_ok ) return false
+
 // ----------------------------------------------------------------------------
 // wxDynamicLibraryDetails: contains details about a loaded wxDynamicLibrary
 // ----------------------------------------------------------------------------
@@ -169,7 +238,7 @@ public:
     static wxDllType         GetProgramHandle();
 
     // return the platform standard DLL extension (with leading dot)
-    static const wxChar *GetDllExt() { return ms_dllext; }
+    static const wxString& GetDllExt() { return ms_dllext; }
 
     wxDynamicLibrary() : m_handle(0) { }
     wxDynamicLibrary(const wxString& libname, int flags = wxDL_DEFAULT)
@@ -297,7 +366,7 @@ protected:
 
 
     // platform specific shared lib suffix.
-    static const wxChar *ms_dllext;
+    static const wxString ms_dllext;
 
     // the handle to DLL or NULL
     wxDllType m_handle;