X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/9d33840bab4e10d701dd36f9b8660f6a13f05afe..538f284a44001ff8285eaafebcc384bf638b5d66:/interface/wx/stream.h

diff --git a/interface/wx/stream.h b/interface/wx/stream.h
index 6398891aa7..4f3bb18a45 100644
--- a/interface/wx/stream.h
+++ b/interface/wx/stream.h
@@ -3,7 +3,7 @@
 // Purpose:     interface of wxStreamBase and its derived classes
 // Author:      wxWidgets team
 // RCS-ID:      $Id$
-// Licence:     wxWindows license
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 
@@ -76,10 +76,39 @@ public:
     virtual bool IsOk() const;
 
     /**
-        Returns @true if the streams supports seeking to arbitrary offsets.
+        Returns @true if the stream supports seeking to arbitrary offsets.
     */
     virtual bool IsSeekable() const;
 
+    /**
+        Resets the stream state.
+
+        By default, resets the stream to good state, i.e. clears any errors.
+        Since wxWidgets 2.9.3 can be also used to explicitly set the state to
+        the specified error (the @a error argument didn't exist in the previous
+        versions).
+
+        @see GetLastError()
+     */
+    void Reset(wxStreamError error = wxSTREAM_NO_ERROR);
+
+    /**
+        Returns the opposite of IsOk().
+        You can use this function to test the validity of the stream as if
+        it was a pointer:
+
+        @code
+            bool DoSomething(wxInputStream& stream)
+            {
+                wxInt32 data;
+                if (!stream.Read(&data, 4))
+                    return false;
+                ...
+            }
+        @endcode
+    */
+    bool operator!() const;
+
 protected:
 
     /**
@@ -155,8 +184,13 @@ public:
         and calling SetBufferIO() but is more convenient.
 
         @since 2.9.0
+
+        @param bufsize
+            The size of buffer in bytes.
+        @param stream
+            The associated input stream, the buffer will be used in read mode.
      */
-    wxStreamBuffer(wxInputStream& stream, size_t bufsize);
+    wxStreamBuffer(size_t bufsize, wxInputStream& stream);
 
     /**
         Constructor for an output buffer of the specified size.
@@ -165,8 +199,13 @@ public:
         and calling SetBufferIO() but is more convenient.
 
         @since 2.9.0
+
+        @param bufsize
+            The size of buffer in bytes.
+        @param stream
+            The associated output stream, the buffer will be used in write mode.
      */
-    wxStreamBuffer(wxOutputStream& stream, size_t bufsize);
+    wxStreamBuffer(size_t bufsize, wxOutputStream& stream);
 
     /**
         Constructor; creates a new empty stream buffer which won't flush any data
@@ -562,7 +601,7 @@ public:
 
     /**
         Reads the specified amount of bytes and stores the data in buffer.
-        To check if the call was successfull you must use LastRead() to check
+        To check if the call was successful you must use LastRead() to check
         if this call did actually read @a size bytes (if it didn't, GetLastError()
         should return a meaningful value).
 
@@ -586,6 +625,11 @@ public:
     /**
         Changes the stream current position.
 
+        This operation in general is possible only for seekable streams 
+        (see wxStreamBase::IsSeekable()); non-seekable streams support only
+        seeking positive amounts in mode @c wxFromCurrent (this is implemented
+        by reading data and simply discarding it).
+
         @param pos
             Offset to seek to.
         @param mode
@@ -596,7 +640,9 @@ public:
     virtual wxFileOffset SeekI(wxFileOffset pos, wxSeekMode mode = wxFromStart);
 
     /**
-        Returns the current stream position.
+        Returns the current stream position or ::wxInvalidOffset if it's not
+        available (e.g. socket streams do not have a size nor a current stream
+        position).
     */
     virtual wxFileOffset TellI() const;
 
@@ -802,7 +848,7 @@ public:
         const wxFilterClassFactory *factory = wxFilterClassFactory::GetFirst();
 
         while (factory) {
-            list << factory->GetProtocol() << _T("\n");
+            list << factory->GetProtocol() << wxT("\n");
             factory = factory->GetNext();
         }
         @endcode
@@ -832,7 +878,7 @@ public:
         const wxChar *const *p;
 
         for (p = factory->GetProtocols(wxSTREAM_FILEEXT); *p; p++)
-            list << *p << _T("\n");
+            list << *p << wxT("\n");
         @endcode
     */
     virtual const wxChar * const* GetProtocols(wxStreamProtocolType type = wxSTREAM_PROTOCOL) const = 0;