fixes for page positioning for notebooks with wxNB_MULTILINE style (closes bugs 70909...

[wxWidgets.git] / src / common / ffile.cpp

diff --git a/src/common/ffile.cpp b/src/common/ffile.cpp
index 95105fbfedea2ebc60f4b60c317bdf2a54b1e84b..503e5bfa0d886350b3109fc2386bcac90209a2a6 100644 (file)
--- a/src/common/ffile.cpp
+++ b/src/common/ffile.cpp
@@ -206,6 +206,9 @@ bool wxFFile::Seek(long ofs, wxSeekMode mode)
 
 size_t wxFFile::Tell() const
 {
+    wxCHECK_MSG( IsOpened(), (size_t)-1,
+                 _T("wxFFile::Tell(): file is closed!") );
+
     long rc = ftell(m_fp);
     if ( rc == -1 )
     {
@@ -218,6 +221,9 @@ size_t wxFFile::Tell() const
 
 size_t wxFFile::Length() const
 {
+    wxCHECK_MSG( IsOpened(), (size_t)-1,
+                 _T("wxFFile::Length(): file is closed!") );
+
     wxFFile& self = *(wxFFile *)this;   // const_cast
 
     size_t posOld = Tell();