Put CInternetException content into a std::string

Flaviu_ 971

How can I put a CInternetException message to a std::string? I have tried:

	catch (CInternetException* pEx)
	{
		pEx->GetErrorMessage(&error[0], _MAX_PATH);
		pEx->Delete();
	}

But I got:

*error C2664: 'BOOL CInternetException::GetErrorMessage(LPTSTR,UINT,PUINT) const': cannot convert argument 1 from 'char ' to 'LPTSTR'

How can I overcome this problem?

Viorel 116.7K Reputation points

2023-11-14T13:05:19.8+00:00
I think that the CString class is more suitable in MFC programs. For example:

CString error; pEx->GetErrorMessage( error.GetBuffer( 1000 ), 1000 ); error.ReleaseBuffer( );

If required, you can reserve a large buffer if you believe that the stack is insufficient.

If STL strings are needed:

#if _UNICODE std::wstring s = error; #else std::string s = error; #endif

Though, it is possible to avoid duplication of buffers and strings.
Flaviu_ 971 Reputation points

2023-11-14T17:27:18.1266667+00:00

I know how to use CString in this case, but my code require std::string, not CString.

Accepted answer

Minxin Yu 11,581 Reputation points Microsoft Vendor

2023-11-15T02:33:54.7566667+00:00
Hi,@Flaviu_
Try the snippet:

try { CInternetSession session; auto pFile = session.OpenURL(_T("htt://www.example.com"));//custom link error } catch (CInternetException* pEx) { TCHAR szError[1024]; pEx->GetErrorMessage(szError, 1024); std::string errorMessage; #ifdef _UNICODE errorMessage = CW2A(szError); #else errorMessage= szError; #endif OutputDebugStringA(("error: "+ errorMessage).c_str()); pEx->Delete(); }

Best regards,

Minxin Yu

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
Please sign in to rate this answer.
Minxin Yu 11,581 Reputation points Microsoft Vendor

2023-11-15T09:00:40.6233333+00:00

Hi,@Flaviu_
glad to know this works for you.
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.

2 additional answers

RLWA32 45,326 Reputation points

2023-11-14T12:36:32.76+00:00
Try

char error[_MAX_PATH]; pEx->GetErrorMessage(error, _MAX_PATH);
Please sign in to rate this answer.
Flaviu_ 971 Reputation points

2023-11-14T17:29:33.1666667+00:00

I have trid what you said, but I got en error:

error C2664: 'BOOL CInternetException::GetErrorMessage(LPTSTR,UINT,PUINT) const': cannot convert argument 1 from 'char [260]' to 'LPTSTR'

RLWA32 45,326 Reputation points

2023-11-14T18:03:38.26+00:00

Since it appears that you are building for UNICODE you need to pass a pointer to a wide character (wchar_t) buffer to GetErrorMessage.

And then use one of the various alternatives to convert the text from wide characters to narrow characters for use with std::string.

Flaviu_ 971 Reputation points

2023-11-15T08:58:25.41+00:00

Yes, that's solved me my request, please convert it as answer.
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.
Guido Franzke 2,196 Reputation points

2023-11-14T12:43:34.22+00:00

Have a look at the example:

https://learn.microsoft.com/cpp/mfc/reference/cfileexception-class?view=msvc-170#geterrormessage
Please sign in to rate this answer.

0 comments No comments
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.

Your answer