Windows: Fix inclusion of <windows.h>

- Always use <qt_windows.h> as the last file to be included.
- Remove it from some headers, use Qt::HANDLE instead of HANDLE.
- Clean up #ifdef, use Q_OS_WIN for Windows/Windows CE.
- Add NOMINMAX to qt_windows.h to avoid problems with the
  min/max macros.
- Remove <windows.h> from qplatformdefs.h (VS2005)

Change-Id: Ic44e2cb3eafce38e1ad645c3bf85745439398e50
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@nokia.com>

1 files changed, 23 insertions, 2 deletions

diff --git a/src/widgets/dialogs/qfiledialog.cpp b/src/widgets/dialogs/qfiledialog.cpp
index da734c80f0..e5a24075d9 100644
--- a/src/widgets/dialogs/qfiledialog.cpp
+++ b/src/widgets/dialogs/qfiledialog.cpp
@@ -45,6 +45,7 @@
 
 #ifndef QT_NO_FILEDIALOG
 #include "qfiledialog_p.h"
+#include "qplatformdialoghelper_qpa.h"
 #include <private/qguiapplication_p.h>
 #include <qfontmetrics.h>
 #include <qaction.h>
@@ -67,11 +68,12 @@
 #if defined(Q_OS_WINCE)
 extern bool qt_priv_ptr_valid;
 #endif
+#endif
 #if defined(Q_OS_UNIX)
 #include <pwd.h>
+#elif defined(Q_OS_WIN)
+#  include <QtCore/qt_windows.h>
 #endif
-#endif
-#include "qplatformdialoghelper_qpa.h"
 
 QT_BEGIN_NAMESPACE
 
@@ -1386,6 +1388,25 @@ QLineEdit *QFileDialogPrivate::lineEdit() const {
     return (QLineEdit*)qFileDialogUi->fileNameEdit;
 }
 
+int QFileDialogPrivate::maxNameLength(const QString &path)
+{
+#if defined(Q_OS_UNIX)
+    return ::pathconf(QFile::encodeName(path).data(), _PC_NAME_MAX);
+#elif defined(Q_OS_WINCE)
+    Q_UNUSED(path);
+    return MAX_PATH;
+#elif defined(Q_OS_WIN)
+    DWORD maxLength;
+    const QString drive = path.left(3);
+    if (::GetVolumeInformation(reinterpret_cast<const wchar_t *>(drive.utf16()), NULL, 0, NULL, &maxLength, NULL, NULL, 0) == FALSE)
+        return -1;
+    return maxLength;
+#else
+    Q_UNUSED(path);
+#endif
+    return -1;
+}
+
 /*
     Sets the view root index to be the file system model index
 */