added necessary QT_DECL_EXPORT/QT_DECL_IMPORT to be able to build a DLL on windows

SMTPEmail.pro

@@ -7,8 +7,13 @@
 QT       += core gui network
 
 TARGET = SMTPEmail
-TEMPLATE = app
 
+TEMPLATE = app
+# uncomment this to build a shared library
+#TEMPLATE = lib
+#CONFIG += dll
+
+DEFINES += SMTP_BUILD
 
 SOURCES += \
     src/emailaddress.cpp \
@@ -37,7 +42,8 @@ HEADERS  += \
     src/SmtpMime \
     src/quotedprintable.h \
     src/mimemultipart.h \
-    src/mimecontentformatter.h
+    src/mimecontentformatter.h \
+    src/smtpexports.h
 
 OTHER_FILES += \
     LICENSE \

src/emailaddress.h

@@ -21,7 +21,9 @@
 
 #include <QObject>
 
-class EmailAddress : public QObject
+#include "smtpexports.h"
+
+class SMTP_EXPORT EmailAddress : public QObject
 {
     Q_OBJECT
 public:

src/mimeattachment.h

@@ -23,7 +23,9 @@
 #include "mimepart.h"
 #include "mimefile.h"
 
-class MimeAttachment : public MimeFile
+#include "smtpexports.h"
+
+class SMTP_EXPORT MimeAttachment : public MimeFile
 {
     Q_OBJECT
 public:

src/mimecontentformatter.h

@@ -22,7 +22,9 @@
 #include <QObject>
 #include <QByteArray>
 
-class MimeContentFormatter : public QObject
+#include "smtpexports.h"
+
+class SMTP_EXPORT MimeContentFormatter : public QObject
 {
     Q_OBJECT
 public:

src/mimefile.h

@@ -22,7 +22,9 @@
 #include "mimepart.h"
 #include <QFile>
 
-class MimeFile : public MimePart
+#include "smtpexports.h"
+
+class SMTP_EXPORT MimeFile : public MimePart
 {
     Q_OBJECT
 public:

src/mimehtml.h

@@ -21,7 +21,9 @@
 
 #include "mimetext.h"
 
-class MimeHtml : public MimeText
+#include "smtpexports.h"
+
+class SMTP_EXPORT MimeHtml : public MimeText
 {
     Q_OBJECT
 public:

src/mimeinlinefile.h

@@ -21,7 +21,9 @@
 
 #include "mimefile.h"
 
-class MimeInlineFile : public MimeFile
+#include "smtpexports.h"
+
+class SMTP_EXPORT MimeInlineFile : public MimeFile
 {
 public:
 

src/mimemessage.h

@@ -24,7 +24,9 @@
 #include "emailaddress.h"
 #include <QList>
 
-class MimeMessage : public QObject
+#include "smtpexports.h"
+
+class SMTP_EXPORT MimeMessage : public QObject
 {
 public:
 

src/mimemultipart.h

@@ -21,7 +21,9 @@
 
 #include "mimepart.h"
 
-class MimeMultiPart : public MimePart
+#include "smtpexports.h"
+
+class SMTP_EXPORT MimeMultiPart : public MimePart
 {
     Q_OBJECT
 public:

src/mimepart.h

@@ -22,7 +22,9 @@
 #include <QObject>
 #include "mimecontentformatter.h"
 
-class MimePart : public QObject
+#include "smtpexports.h"
+
+class SMTP_EXPORT MimePart : public QObject
 {
     Q_OBJECT
 public:

src/mimetext.h

@@ -21,7 +21,9 @@
 
 #include "mimepart.h"
 
-class MimeText : public MimePart
+#include "smtpexports.h"
+
+class SMTP_EXPORT MimeText : public MimePart
 {
 public:
 

src/quotedprintable.h

@@ -22,7 +22,9 @@
 #include <QObject>
 #include <QByteArray>
 
-class QuotedPrintable : public QObject
+#include "smtpexports.h"
+
+class SMTP_EXPORT QuotedPrintable : public QObject
 {
     Q_OBJECT
 public:

src/smtpclient.h

@@ -23,9 +23,9 @@
 #include <QtNetwork/QSslSocket>
 
 #include "mimemessage.h"
+#include "smtpexports.h"
 
-
+class SMTP_EXPORT SmtpClient : public QObject
-class SmtpClient : public QObject
 {
     Q_OBJECT
 public:

src/smtpexports.h

@@ -0,0 +1,10 @@
+#ifndef SMTPEXPORTS_H
+#define SMTPEXPORTS_H
+
+#ifdef SMTP_BUILD
+#define SMTP_EXPORT Q_DECL_EXPORT
+#else
+#define SMTP_EXPORT Q_DECL_IMPORT
+#endif
+
+#endif // SMTPEXPORTS_H