ATL Component with C++ class
-
Hi, I want to build a ATL wrapper on c++ class and would like to use that component in VB. I insert an ATL class MyAWrapper I add one property HRESULT String([out, retval] BSTR *pVal) one method HRESULT ClearString() to IMyAWrapper. IDL file shows it then in MyAWrapper.h i put following c++ code class foo { std::string m_str; public: foo(std::string bar, bool baz) : m_str(bar) { if (baz) throw std::exception(); } std::string get_string(void) { return m_str; } void clear_string(void) { m_str = ""; } }; in ATL class.. class MyAWrapper I addfollowing code. STDMETHOD(FinalConstruct)(void) { try { m_pfoo = new foo("test", false); } catch (...) { return E_FAIL; } return S_OK; } in MyAWrapper.cpp, I put STDMETHODIMP MyAWrapper::get_String(BSTR *pVal) { // TODO: Add your implementation code here if (pVal == NULL) return E_POINTER; std::string sTemp = m_pfoo->get_string(); *pVal = ::SysAllocStringLen(sTemp.c_str(), sTemp.length()); return *pVal ? S_OK : E_OUTOFMEMORY; } STDMETHODIMP MyAWrapper::ClearString() { // TODO: Add your implementation code here m_pfoo->clear_string(); } Please tell me Are these stpes OK?? or where to put c++ code? I can not compile the project.. I get around 34 errors one of which is 'std' : is not a class or namespace name Pleasew tell me how to have this perfectly function. Thanks Lee
Leya
-
Hi, I want to build a ATL wrapper on c++ class and would like to use that component in VB. I insert an ATL class MyAWrapper I add one property HRESULT String([out, retval] BSTR *pVal) one method HRESULT ClearString() to IMyAWrapper. IDL file shows it then in MyAWrapper.h i put following c++ code class foo { std::string m_str; public: foo(std::string bar, bool baz) : m_str(bar) { if (baz) throw std::exception(); } std::string get_string(void) { return m_str; } void clear_string(void) { m_str = ""; } }; in ATL class.. class MyAWrapper I addfollowing code. STDMETHOD(FinalConstruct)(void) { try { m_pfoo = new foo("test", false); } catch (...) { return E_FAIL; } return S_OK; } in MyAWrapper.cpp, I put STDMETHODIMP MyAWrapper::get_String(BSTR *pVal) { // TODO: Add your implementation code here if (pVal == NULL) return E_POINTER; std::string sTemp = m_pfoo->get_string(); *pVal = ::SysAllocStringLen(sTemp.c_str(), sTemp.length()); return *pVal ? S_OK : E_OUTOFMEMORY; } STDMETHODIMP MyAWrapper::ClearString() { // TODO: Add your implementation code here m_pfoo->clear_string(); } Please tell me Are these stpes OK?? or where to put c++ code? I can not compile the project.. I get around 34 errors one of which is 'std' : is not a class or namespace name Pleasew tell me how to have this perfectly function. Thanks Lee
Leya
yang__lee wrote:
std' : is not a class or namespace name
Probably, you forgot to include header,
stringin this case.
Prasad MS MVP - VC++