Fix issue #229: Program is crashed!

Src/HexMergeDoc.cpp

@@ -550,7 +550,7 @@ void CHexMergeDoc::CheckFileChanged(void)
 {
 	for (int pane = 0; pane < m_nBuffers; ++pane)
 	{
-		if (m_pView[pane]->IsFileChangedOnDisk(m_filePaths[pane].c_str()))
+		if (m_pView[pane]->IsFileChangedOnDisk(m_filePaths[pane].c_str()) == FileChanged)
 		{
 			String msg = strutils::format_string1(_("Another application has updated file\n%1\nsince WinMerge scanned it last time.\n\nDo you want to reload the file?"), m_filePaths[pane]);
 			if (AfxMessageBox(msg.c_str(), MB_YESNO | MB_ICONWARNING) == IDYES)
@@ -732,7 +732,8 @@ void CHexMergeDoc::OnFileReload()
 		fileloc[pane].setPath(m_filePaths[pane]);
 		bRO[pane] = m_pView[pane]->GetReadOnly();
 	}
-	OpenDocs(m_nBuffers, fileloc, bRO, m_strDesc);
+	if (!OpenDocs(m_nBuffers, fileloc, bRO, m_strDesc))
+		return;
 	MoveOnLoad(GetActiveMergeView()->m_nThisPane);
 }
 

Src/HexMergeView.cpp

@@ -246,18 +246,19 @@ int CHexMergeView::GetLength()
  * @param [in] path File to check
  * @return `true` if file is changed.
  */
-bool CHexMergeView::IsFileChangedOnDisk(LPCTSTR path)
+IMergeDoc::FileChange CHexMergeView::IsFileChangedOnDisk(LPCTSTR path)
 {
 	DiffFileInfo dfi;
-	dfi.Update(path);
+	if (!dfi.Update(path))
+		return IMergeDoc::FileRemoved;
 	int tolerance = 0;
 	if (GetOptionsMgr()->GetBool(OPT_IGNORE_SMALL_FILETIME))
 		tolerance = SmallTimeDiff; // From MainFrm.h
 	int64_t timeDiff = dfi.mtime - m_fileInfo.mtime;
 	if (timeDiff < 0) timeDiff = -timeDiff;
 	if ((timeDiff > tolerance * Poco::Timestamp::resolution()) || (dfi.size != m_fileInfo.size))
-		return true;
-	return false;
+		return IMergeDoc::FileChanged;
+	return IMergeDoc::FileNoChange;
 }
 
 /**
@@ -298,7 +299,7 @@ HRESULT CHexMergeView::LoadFile(LPCTSTR path)
 HRESULT CHexMergeView::SaveFile(LPCTSTR path)
 {
 	// Warn user in case file has been changed by someone else
-	if (IsFileChangedOnDisk(path))
+	if (IsFileChangedOnDisk(path) == IMergeDoc::FileChanged)
 	{
 		String msg = strutils::format_string1(_("Another application has updated file\n%1\nsince WinMerge loaded it.\n\nOverwrite changed file?"), path);
 		if (AfxMessageBox(msg.c_str(), MB_ICONWARNING | MB_YESNO) == IDNO)

Src/HexMergeView.h

@@ -25,6 +25,7 @@
 #pragma once
 
 #include "DiffFileInfo.h"
+#include "IMergeDoc.h"
 
 class CHexMergeDoc;
 class IHexEditorWindow;
@@ -55,7 +56,7 @@ class CHexMergeView : public CView
 	bool GetReadOnly();
 	void SetReadOnly(bool);
 	void ResizeWindow();
-	bool IsFileChangedOnDisk(LPCTSTR);
+	IMergeDoc::FileChange IsFileChangedOnDisk(LPCTSTR);
 	void ZoomText(int amount);
 	static void CopySel(const CHexMergeView *src, CHexMergeView *dst);
 	static void CopyAll(const CHexMergeView *src, CHexMergeView *dst);

Src/IMergeDoc.h

@@ -6,6 +6,13 @@ class CDirDoc;
 
 struct IMergeDoc
 {
+	enum FileChange
+	{
+		FileNoChange,
+		FileChanged,
+		FileRemoved,
+	};
+
 	virtual void SetDirDoc(CDirDoc *pDirDoc) = 0;
 	virtual bool CloseNow(void) = 0;
 	virtual bool GenerateReport(const String &path) const = 0;

Src/ImgMergeFrm.cpp

@@ -304,25 +304,26 @@ void CImgMergeFrame::SetDirDoc(CDirDoc * pDirDoc)
 	m_pDirDoc = pDirDoc;
 }
 
-bool CImgMergeFrame::IsFileChangedOnDisk(int pane) const
+IMergeDoc::FileChange CImgMergeFrame::IsFileChangedOnDisk(int pane) const
 {
 	DiffFileInfo dfi;
-	dfi.Update(m_filePaths[pane]);
+	if (!dfi.Update(m_filePaths[pane]))
+		return FileRemoved;
 	int tolerance = 0;
 	if (GetOptionsMgr()->GetBool(OPT_IGNORE_SMALL_FILETIME))
 		tolerance = SmallTimeDiff; // From MainFrm.h
 	int64_t timeDiff = dfi.mtime - m_fileInfo[pane].mtime;
 	if (timeDiff < 0) timeDiff = -timeDiff;
 	if ((timeDiff > tolerance * Poco::Timestamp::resolution()) || (dfi.size != m_fileInfo[pane].size))
-		return true;
-	return false;
+		return FileChanged;
+	return FileNoChange;
 }
 
 void CImgMergeFrame::CheckFileChanged(void)
 {
 	for (int pane = 0; pane < m_pImgMergeWindow->GetPaneCount(); ++pane)
 	{
-		if (IsFileChangedOnDisk(pane))
+		if (IsFileChangedOnDisk(pane) == FileChanged)
 		{
 			String msg = strutils::format_string1(_("Another application has updated file\n%1\nsince WinMerge scanned it last time.\n\nDo you want to reload the file?"), m_filePaths[pane]);
 			if (AfxMessageBox(msg.c_str(), MB_YESNO | MB_ICONWARNING) == IDYES)

Src/ImgMergeFrm.h

@@ -72,7 +72,7 @@ class CImgMergeFrame : public CMergeFrameCommon,public IMergeDoc
 	bool GenerateReport(const String& sFileName) const override;
 	void DoAutoMerge(int dstPane);
 	bool IsModified() const;
-	bool IsFileChangedOnDisk(int pane) const;
+	IMergeDoc::FileChange IsFileChangedOnDisk(int pane) const;
 	void CheckFileChanged(void) override;
 	String GetDescription(int pane) const { return m_strDesc[pane]; }
 	static bool IsLoadable();

Src/MergeDoc.h

@@ -140,13 +140,6 @@ class CLocationView;
 class CMergeDoc : public CDocument, public IMergeDoc
 {
 public:
-	enum FileChange
-	{
-		FileNoChange,
-		FileChanged,
-		FileRemoved,
-	};
-
 // Attributes
 public:
 	static int m_nBuffersTemp;