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Improve wxBasicString and fix memory leaks when using it

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Improve and extend wxBasicString API and fix multiple BSTR leaks in due to
confusingly named Get() method in the old API.

Closes #17889.
This commit is contained in:
VZ
2017-07-03 02:28:37 +02:00
committed by GitHub
parent 715608fe6a 6725a0a1b8
commit 294436c8bb
6 changed files with 152 additions and 78 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
include/wx/msw/ole/oleutils.h
View File

@@ -66,19 +66,47 @@ inline void wxOleUninitialize()
class WXDLLIMPEXP_CORE wxBasicString
{
public:
// ctors & dtor
// Takes over the ownership of bstr
explicit wxBasicString(BSTR bstr = NULL);
// Constructs the BSTR from wxString
wxBasicString(const wxString& str);
// Creates a copy of the BSTR owned by bstr
wxBasicString(const wxBasicString& bstr);
// Frees the owned BSTR
~wxBasicString();
// Returns the owned BSTR and gives up its ownership
BSTR Detach();
// Frees the owned BSTR
void Free();
// Returns a copy of the owned BSTR,
// the caller is responsible for freeing it
BSTR Copy() const { return SysAllocString(m_bstrBuf); }
// Returns the address of the owned BSTR, not to be called
// when wxBasicString already contains a non-NULL BSTR
BSTR* ByRef();
// Sets its BSTR to a copy of the BSTR owned by bstr
wxBasicString& operator=(const wxBasicString& bstr);
// accessors
// just get the string
operator BSTR() const { return m_bstrBuf; }
// retrieve a copy of our string - caller must SysFreeString() it later!
BSTR Get() const { return SysAllocString(m_bstrBuf); }
// Creates its BSTR from wxString
wxBasicString& operator=(const wxString& str);
// Takes over the ownership of bstr
wxBasicString& operator=(BSTR bstr);
/// Returns the owned BSTR while keeping its ownership
operator BSTR() const { return m_bstrBuf; }
// retrieve a copy of our string - caller must SysFreeString() it later!
wxDEPRECATED_MSG("use Copy() instead")
BSTR Get() const { return Copy(); }
private:
// actual string
BSTR m_bstrBuf;

6
src/msw/mediactrl_am.cpp
View File

@@ -1127,7 +1127,7 @@ bool wxAMMediaBackend::Load(const wxURI& location, const wxURI& proxy)
if(pPlay)
{
pPlay->put_UseHTTPProxy(VARIANT_TRUE);
pPlay->put_HTTPProxyHost(wxBasicString(proxy.GetServer()).Get());
pPlay->put_HTTPProxyHost(wxBasicString(proxy.GetServer()));
pPlay->put_HTTPProxyPort(wxAtoi(proxy.GetPort()));
pPlay->Release();
}
@@ -1150,9 +1150,9 @@ bool wxAMMediaBackend::DoLoad(const wxString& location)
// the docs say its async and put_FileName is not -
// but in practice they both seem to be async anyway
if(GetMP())
hr = GetMP()->Open( wxBasicString(location).Get() );
hr = GetMP()->Open( wxBasicString(location) );
else
hr = GetAM()->put_FileName( wxBasicString(location).Get() );
hr = GetAM()->put_FileName( wxBasicString(location) );
if(FAILED(hr))
{

34
src/msw/mediactrl_wmp10.cpp
View File

@@ -905,21 +905,21 @@ bool wxWMP10MediaBackend::Load(const wxURI& location,
{
long lOldSetting;
if( pWMPNetwork->getProxySettings(
wxBasicString(location.GetScheme()).Get(), &lOldSetting
wxBasicString(location.GetScheme()), &lOldSetting
) == 0 &&
pWMPNetwork->setProxySettings(
wxBasicString(location.GetScheme()).Get(), // protocol
wxBasicString(location.GetScheme()), // protocol
2) == 0) // 2 == manually specify
{
BSTR bsOldName = NULL;
wxBasicString bsOldName;
long lOldPort = 0;
pWMPNetwork->getProxyName(
wxBasicString(location.GetScheme()).Get(),
&bsOldName);
wxBasicString(location.GetScheme()),
bsOldName.ByRef());
pWMPNetwork->getProxyPort(
wxBasicString(location.GetScheme()).Get(),
wxBasicString(location.GetScheme()),
&lOldPort);
long lPort;
@@ -936,11 +936,11 @@ bool wxWMP10MediaBackend::Load(const wxURI& location,
}
if( pWMPNetwork->setProxyName(
wxBasicString(location.GetScheme()).Get(), // proto
wxBasicString(server).Get() ) == 0 &&
wxBasicString(location.GetScheme()), // proto
wxBasicString(server) ) == 0 &&
pWMPNetwork->setProxyPort(
wxBasicString(location.GetScheme()).Get(), // proto
wxBasicString(location.GetScheme()), // proto
lPort
) == 0
)
@@ -948,16 +948,16 @@ bool wxWMP10MediaBackend::Load(const wxURI& location,
bOK = DoLoad(location.BuildURI());
pWMPNetwork->setProxySettings(
wxBasicString(location.GetScheme()).Get(), // protocol
wxBasicString(location.GetScheme()), // protocol
lOldSetting);
if(bsOldName)
pWMPNetwork->setProxyName(
wxBasicString(location.GetScheme()).Get(), // protocol
wxBasicString(location.GetScheme()), // protocol
bsOldName);
if(lOldPort)
pWMPNetwork->setProxyPort(
wxBasicString(location.GetScheme()).Get(), // protocol
wxBasicString(location.GetScheme()), // protocol
lOldPort);
pWMPNetwork->Release();
@@ -997,7 +997,7 @@ bool wxWMP10MediaBackend::DoLoad(const wxString& location)
{
IWMPMedia* pWMPMedia;
if( (hr = pWMPCore3->newMedia(wxBasicString(location).Get(),
if( (hr = pWMPCore3->newMedia(wxBasicString(location),
&pWMPMedia)) == 0)
{
// this (get_duration) will actually FAIL, but it will work.
@@ -1012,7 +1012,7 @@ bool wxWMP10MediaBackend::DoLoad(const wxString& location)
#endif
{
// just load it the "normal" way
hr = m_pWMPPlayer->put_URL( wxBasicString(location).Get() );
hr = m_pWMPPlayer->put_URL( wxBasicString(location) );
}
if(FAILED(hr))
@@ -1061,12 +1061,12 @@ bool wxWMP10MediaBackend::ShowPlayerControls(wxMediaCtrlPlayerControls flags)
if(!flags)
{
m_pWMPPlayer->put_enabled(VARIANT_FALSE);
m_pWMPPlayer->put_uiMode(wxBasicString(wxT("none")).Get());
m_pWMPPlayer->put_uiMode(wxBasicString(wxT("none")));
}
else
{
// TODO: use "custom"? (note that CE only supports none/full)
m_pWMPPlayer->put_uiMode(wxBasicString(wxT("full")).Get());
m_pWMPPlayer->put_uiMode(wxBasicString(wxT("full")));
m_pWMPPlayer->put_enabled(VARIANT_TRUE);
}
@@ -1358,7 +1358,7 @@ wxLongLong wxWMP10MediaBackend::GetDownloadTotal()
if(m_pWMPPlayer->get_currentMedia(&pWMPMedia) == 0)
{
BSTR bsOut;
pWMPMedia->getItemInfo(wxBasicString(wxT("FileSize")).Get(),
pWMPMedia->getItemInfo(wxBasicString(wxT("FileSize")),
&bsOut);
wxString sFileSize = wxConvertStringFromOle(bsOut);

18
src/msw/ole/access.cpp
View File

@@ -938,8 +938,7 @@ STDMETHODIMP wxIAccessible::get_accDefaultAction ( VARIANT varID, BSTR* pszDefau
}
else
{
wxBasicString basicString(defaultAction);
* pszDefaultAction = basicString.Get();
* pszDefaultAction = wxBasicString(defaultAction).Detach();
return S_OK;
}
}
@@ -999,8 +998,7 @@ STDMETHODIMP wxIAccessible::get_accDescription ( VARIANT varID, BSTR* pszDescrip
}
else
{
wxBasicString basicString(description);
* pszDescription = basicString.Get();
* pszDescription = wxBasicString(description).Detach();
return S_OK;
}
}
@@ -1060,8 +1058,7 @@ STDMETHODIMP wxIAccessible::get_accHelp ( VARIANT varID, BSTR* pszHelp)
}
else
{
wxBasicString basicString(helpString);
* pszHelp = basicString.Get();
* pszHelp = wxBasicString(helpString).Detach();
return S_OK;
}
}
@@ -1171,8 +1168,7 @@ STDMETHODIMP wxIAccessible::get_accKeyboardShortcut ( VARIANT varID, BSTR* pszKe
}
else
{
wxBasicString basicString(keyboardShortcut);
* pszKeyboardShortcut = basicString.Get();
* pszKeyboardShortcut = wxBasicString(keyboardShortcut).Detach();
return S_OK;
}
}
@@ -1235,8 +1231,7 @@ STDMETHODIMP wxIAccessible::get_accName ( VARIANT varID, BSTR* pszName)
}
else
{
wxBasicString basicString(name);
*pszName = basicString.Get();
*pszName = wxBasicString(name).Detach();
}
return S_OK;
}
@@ -1416,8 +1411,7 @@ STDMETHODIMP wxIAccessible::get_accValue ( VARIANT varID, BSTR* pszValue)
}
else
{
wxBasicString basicString(strValue);
* pszValue = basicString.Get();
* pszValue = wxBasicString(strValue).Detach();
return S_OK;
}
}

70
src/msw/ole/oleutils.cpp
View File

@@ -38,7 +38,7 @@
WXDLLEXPORT BSTR wxConvertStringToOle(const wxString& str)
{
return wxBasicString(str).Get();
return wxBasicString(str).Detach();
}
WXDLLEXPORT wxString wxConvertStringFromOle(BSTR bStr)
@@ -71,20 +71,19 @@ WXDLLEXPORT wxString wxConvertStringFromOle(BSTR bStr)
// wxBasicString
// ----------------------------------------------------------------------------
wxBasicString::wxBasicString(BSTR bstr)
{
m_bstrBuf = bstr;
}
wxBasicString::wxBasicString(const wxString& str)
{
m_bstrBuf = SysAllocString(str.wc_str(*wxConvCurrent));
}
wxBasicString::wxBasicString(const wxBasicString& src)
wxBasicString::wxBasicString(const wxBasicString& bstr)
{
m_bstrBuf = src.Get();
}
wxBasicString& wxBasicString::operator=(const wxBasicString& src)
{
SysReAllocString(&m_bstrBuf, src);
return *this;
m_bstrBuf = bstr.Copy();
}
wxBasicString::~wxBasicString()
@@ -92,6 +91,59 @@ wxBasicString::~wxBasicString()
SysFreeString(m_bstrBuf);
}
BSTR wxBasicString::Detach()
{
BSTR bstr = m_bstrBuf;
m_bstrBuf = NULL;
return bstr;
}
void wxBasicString::Free()
{
SysFreeString(m_bstrBuf);
m_bstrBuf = NULL;
}
BSTR* wxBasicString::ByRef()
{
wxASSERT_MSG(!m_bstrBuf,
wxS("Can't get direct access to initialized BSTR"));
return &m_bstrBuf;
}
wxBasicString& wxBasicString::operator=(const wxBasicString& src)
{
if ( this != &src )
{
wxCHECK_MSG(m_bstrBuf == NULL || m_bstrBuf != src.m_bstrBuf,
*this, wxS("Attempting to assign already owned BSTR"));
SysFreeString(m_bstrBuf);
m_bstrBuf = src.Copy();
}
return *this;
}
wxBasicString& wxBasicString::operator=(const wxString& str)
{
SysFreeString(m_bstrBuf);
m_bstrBuf = SysAllocString(str.wc_str(*wxConvCurrent));
return *this;
}
wxBasicString& wxBasicString::operator=(BSTR bstr)
{
wxCHECK_MSG(m_bstrBuf == NULL || m_bstrBuf != bstr,
*this, wxS("Attempting to assign already owned BSTR"));
SysFreeString(m_bstrBuf);
m_bstrBuf = bstr;
return *this;
}
// ----------------------------------------------------------------------------
// Convert variants

58
src/msw/webview_ie.cpp
View File

@@ -231,9 +231,9 @@ wxString wxWebViewIE::GetPageSource() const
hr = bodyTag->get_parentElement(&htmlTag);
if(SUCCEEDED(hr))
{
BSTR bstr;
if ( htmlTag->get_outerHTML(&bstr) == S_OK )
source = wxString(bstr);
wxBasicString bstr;
if ( htmlTag->get_outerHTML(bstr.ByRef()) == S_OK )
source = bstr;
}
}
return source;
@@ -576,8 +576,8 @@ wxString wxWebViewIE::GetCurrentTitle() const
wxString s;
if(document)
{
BSTR title;
if ( document->get_nameProp(&title) == S_OK )
wxBasicString title;
if ( document->get_nameProp(title.ByRef()) == S_OK )
s = title;
}
@@ -705,8 +705,8 @@ bool wxWebViewIE::IsEditable() const
if(document)
{
BSTR mode;
if ( document->get_designMode(&mode) == S_OK )
wxBasicString mode;
if ( document->get_designMode(mode.ByRef()) == S_OK )
{
if ( wxString(mode) == "On" )
return true;
@@ -731,9 +731,9 @@ bool wxWebViewIE::HasSelection() const
HRESULT hr = document->get_selection(&selection);
if(SUCCEEDED(hr))
{
BSTR type;
if ( selection->get_type(&type) == S_OK )
sel = wxString(type);
wxBasicString type;
if ( selection->get_type(type.ByRef()) == S_OK )
sel = type;
}
return sel != "None";
}
@@ -767,9 +767,9 @@ wxString wxWebViewIE::GetSelectedText() const
hr = disrange->QueryInterface(IID_IHTMLTxtRange, (void**)&range);
if(SUCCEEDED(hr))
{
BSTR text;
if ( range->get_text(&text) == S_OK )
selected = wxString(text);
wxBasicString text;
if ( range->get_text(text.ByRef()) == S_OK )
selected = text;
}
}
}
@@ -800,9 +800,9 @@ wxString wxWebViewIE::GetSelectedSource() const
hr = disrange->QueryInterface(IID_IHTMLTxtRange, (void**)&range);
if(SUCCEEDED(hr))
{
BSTR text;
if ( range->get_htmlText(&text) == S_OK )
selected = wxString(text);
wxBasicString text;
if ( range->get_htmlText(text.ByRef()) == S_OK )
selected = text;
}
}
}
@@ -841,9 +841,9 @@ wxString wxWebViewIE::GetPageText() const
HRESULT hr = document->get_body(&body);
if(SUCCEEDED(hr))
{
BSTR out;
if ( body->get_innerText(&out) == S_OK )
text = wxString(out);
wxBasicString out;
if ( body->get_innerText(out.ByRef()) == S_OK )
text = out;
}
return text;
}
@@ -950,7 +950,6 @@ wxCOMPtr<IHTMLDocument2> wxWebViewIE::GetDocument() const
bool wxWebViewIE::IsElementVisible(wxCOMPtr<IHTMLElement> elm)
{
wxCOMPtr<IHTMLElement> elm1 = elm;
BSTR tmp_bstr;
bool is_visible = true;
//This method is not perfect but it does discover most of the hidden elements.
//so if a better solution is found, then please do improve.
@@ -962,15 +961,18 @@ bool wxWebViewIE::IsElementVisible(wxCOMPtr<IHTMLElement> elm)
wxCOMPtr<wxIHTMLCurrentStyle> style;
if(SUCCEEDED(elm2->get_currentStyle(&style)))
{
wxBasicString display_bstr;
wxBasicString visibility_bstr;
//Check if the object has the style display:none.
if((style->get_display(&tmp_bstr) != S_OK) ||
(tmp_bstr != NULL && (wxCRT_StricmpW(tmp_bstr, L"none") == 0)))
if((style->get_display(display_bstr.ByRef()) != S_OK) ||
wxString(display_bstr).IsSameAs(wxS("none"), false))
{
is_visible = false;
}
//Check if the object has the style visibility:hidden.
if((is_visible && (style->get_visibility(&tmp_bstr) != S_OK)) ||
(tmp_bstr != NULL && wxCRT_StricmpW(tmp_bstr, L"hidden") == 0))
if((is_visible && (style->get_visibility(visibility_bstr.ByRef()) != S_OK)) ||
wxString(visibility_bstr).IsSameAs(wxS("hidden"), false))
{
is_visible = false;
}
@@ -1007,8 +1009,9 @@ void wxWebViewIE::FindInternal(const wxString& text, int flags, int internal_fla
if(SUCCEEDED(document->QueryInterface(wxIID_IMarkupContainer, (void **)&pIMC)))
{
wxCOMPtr<wxIMarkupPointer> ptrBegin, ptrEnd;
BSTR attr_bstr = SysAllocString(L"style=\"background-color:#ffff00\"");
BSTR text_bstr = SysAllocString(text.wc_str());
wxBasicString attr_bstr(wxString("style=\"background-color:#ffff00\""));
wxBasicString text_bstr(text.wc_str());
pIMS->CreateMarkupPointer(&ptrBegin);
pIMS->CreateMarkupPointer(&ptrEnd);
@@ -1064,9 +1067,6 @@ void wxWebViewIE::FindInternal(const wxString& text, int flags, int internal_fla
}
ptrBegin->MoveToPointer(ptrEnd);
}
//Clean up.
SysFreeString(text_bstr);
SysFreeString(attr_bstr);
}
}
}