Windows fixes

include/qpdf/QPDFAcroFormDocumentHelper.hh

@@ -83,6 +83,7 @@
 class QPDFAcroFormDocumentHelper: public QPDFDocumentHelper
 {
   public:
+    QPDF_DLL
     QPDFAcroFormDocumentHelper(QPDF&);
 
     // This class lazily creates an internal cache of the mapping
@@ -163,6 +164,7 @@ class QPDFAcroFormDocumentHelper: public QPDFDocumentHelper
         friend class QPDFAcroFormDocumentHelper;
 
       public:
+        QPDF_DLL
         ~Members();
 
       private:

include/qpdf/QPDFAnnotationObjectHelper.hh

@@ -29,6 +29,7 @@
 class QPDFAnnotationObjectHelper: public QPDFObjectHelper
 {
   public:
+    QPDF_DLL
     QPDFAnnotationObjectHelper(QPDFObjectHandle);
 
     // This class provides helper methods for certain types of
@@ -73,6 +74,7 @@ class QPDFAnnotationObjectHelper: public QPDFObjectHelper
         friend class QPDFPageObjectHelper;
 
       public:
+        QPDF_DLL
         ~Members();
 
       private:

include/qpdf/QPDFDocumentHelper.hh

@@ -45,6 +45,10 @@ class QPDFDocumentHelper
     {
     }
     QPDF_DLL
+    virtual ~QPDFDocumentHelper()
+    {
+    }
+    QPDF_DLL
     QPDF& getQPDF()
     {
         return this->qpdf;

include/qpdf/QPDFFormFieldObjectHelper.hh

@@ -33,7 +33,9 @@
 class QPDFFormFieldObjectHelper: public QPDFObjectHelper
 {
   public:
+    QPDF_DLL
     QPDFFormFieldObjectHelper();
+    QPDF_DLL
     QPDFFormFieldObjectHelper(QPDFObjectHandle);
 
     QPDF_DLL
@@ -143,6 +145,7 @@ class QPDFFormFieldObjectHelper: public QPDFObjectHelper
         friend class QPDFFormFieldObjectHelper;
 
       public:
+        QPDF_DLL
         ~Members();
 
       private:

include/qpdf/QPDFObjectHelper.hh

@@ -46,6 +46,10 @@ class QPDFObjectHelper
     {
     }
     QPDF_DLL
+    virtual ~QPDFObjectHelper()
+    {
+    }
+    QPDF_DLL
     QPDFObjectHandle getObjectHandle()
     {
         return this->oh;

include/qpdf/QPDFPageDocumentHelper.hh

@@ -34,6 +34,7 @@
 class QPDFPageDocumentHelper: public QPDFDocumentHelper
 {
   public:
+    QPDF_DLL
     QPDFPageDocumentHelper(QPDF&);
 
     // Traverse page tree, and return all /Page objects wrapped in
@@ -85,6 +86,7 @@ class QPDFPageDocumentHelper: public QPDFDocumentHelper
         friend class QPDFPageDocumentHelper;
 
       public:
+        QPDF_DLL
         ~Members();
 
       private:

include/qpdf/QPDFPageObjectHelper.hh

@@ -32,6 +32,7 @@
 class QPDFPageObjectHelper: public QPDFObjectHelper
 {
   public:
+    QPDF_DLL
     QPDFPageObjectHelper(QPDFObjectHandle);
 
     // Returns an empty map if there are no images or no resources.
@@ -141,6 +142,7 @@ class QPDFPageObjectHelper: public QPDFObjectHelper
         friend class QPDFPageObjectHelper;
 
       public:
+        QPDF_DLL
         ~Members();
 
       private: