Wide Char To Multbyte

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I'm printing results to a log file as well as to the console. All is fine on the console screen. The log file is not good. An example of the logfile.

"Source IP:65.39.148.3400EBF5D000294844
2 URL:00407B00"

it should be
Source IP:65.39.148.34
1 URL: www.codeprojet.com
2 URL: codeproject.com

The project is in Multi-Byte
Here is the code...

C++

void PrintBrowserInfo(IWebBrowser2 *pBrowser) {
	BSTR bstr;
 	pBrowser->get_LocationURL(&bstr);
	wprintf(L"\n  1 URL: %s\n\n", bstr);
	myfile << "\n   1 URL:" << bstr;
	std::wstring wsURL;
	wsURL = bstr;
 	
	size_t DSlashLoc = wsURL.find(L"://");
	if (DSlashLoc != wsURL.npos)
		{
		wsURL.erase(wsURL.begin(), wsURL.begin() + DSlashLoc + 3);
		}
	DSlashLoc = wsURL.find(L"www.");
	if (DSlashLoc == 0)
		{
		wsURL.erase(wsURL.begin(), wsURL.begin() + 4);
		}
	
	wprintf(L"\n   2 URL: %s\n\n", wsURL.c_str());
	myfile << "\n   2 URL:" << wsURL.c_str();
	SysFreeString(bstr);
}

I tried doing this...

myfile <<L "\n 2 URL:" << wsURL.c_str();
It did not produce the correct results.

Posted 8-Nov-11 6:51am

Member 7766180

Updated 8-Nov-11 11:12am

v2

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Richard MacCutchan · Accepted Answer · 2011-11-08T07:13:00

Solution 1

Sending the BSTR direct to the insertion operator is causing you this problem since it is not a recognised type. Convert it to a proper character pointer and it should work. Note that (assuming myfile is an instance of ofstream that there is no overload that accepts a wide string, as seen here[^].

Posted 8-Nov-11 7:13am

Richard MacCutchan

Comments

Member 7766180 8-Nov-11 13:27pm

Thank you Richard! Just one question.....How does one do this?
myfile is an instance of ofstream

Richard MacCutchan 8-Nov-11 16:10pm

Also (as I should have known) you could just use the wofstream class.

Richard MacCutchan 8-Nov-11 16:11pm

You already know how to get the wstring from the BSTR. So you need to use the WideCharToMultiByte() function to convert to ascii which you can then write to your file. Alternatively you could use an ordinary file and the fwprintf function for all writes. (posted in the wrong place before).

Member 7766180 8-Nov-11 16:27pm

I tried this..and I'm getting a number.
wchar_t LogURL = WideCharToMultiByte( CP_UTF8, 0, wsURL.c_str(), -1,NULL, 0, NULL, NULL);
myfile << "\n URL:" << LogURL;

will try wofstream now. the problem is that I am already using ofstream everywhere else and it's just this one line.

Richard MacCutchan 8-Nov-11 16:30pm

I guess you did not read the documentation in the link I gave you.

Member 7766180 8-Nov-11 16:33pm

I did. I guess I didn't understand it!

Member 7766180 8-Nov-11 16:51pm

Is this closer?
char LogURL;

WideCharToMultiByte( CP_ACP,WC_COMPOSITECHECK, wsURL.c_str(), -1, LogURL, sizeofLogURL, NULL, NULL);

myfile << "\n URL:" << LogURL;

Member 7766180 8-Nov-11 17:53pm

This works...
wprintf(L"\n URL: %s\n\n", wsURL.c_str());
int length = WideCharToMultiByte (CP_ACP, WC_COMPOSITECHECK, wsURL.c_str(), -1, NULL, 0, NULL, NULL);
std::string LogURL(length+1, 0);
int result = WideCharToMultiByte (CP_ACP, WC_COMPOSITECHECK, wsURL.c_str(), -1, &LogURL[0],length+1, NULL, NULL);
myfile << "\n URL:" << LogURL;

Richard MacCutchan 8-Nov-11 18:23pm

Well done, you nailed that. Just another function (or two if you count the reverse process) that you know.