Re: How do I display unicode characters in a web page using an isapi dll?

"Giovanni Dicanio" <>
Fri, 18 Jan 2008 20:37:22 +0100
There are several encodings for Unicode, like UTF-8 and UTF-16.
std::wstring or Windows WCHAR are Unicode UTF-16. Unicode UTF-16 is fine for
internal processing inside a Windows application.
But, in general, when you move Unicode text and strings over the web (also
in HTML pages) outside an application boundaries, you usually use Unicode

In fact, when I read your source code, I found that you clearly declared
that you do use Unicode UTF-8 in your HTML:

           html = L"<html><head><meta http-equiv='content-type'
content='text/html; charset=utf-8' /></head><body><p>?KX3?J?U</p></

[see "charset=utf-8" --> it means that you are using UTF-8 as Unicode
encoding for the HTML]

So, my guess is that you are declaring that you are going to use Unicode
UTF-8, but instead you are actually using UTF-16.

I think you should convert your Unicode UTF-16 text (including Chinese
"characters") into UTF-8 (e.g. using ::WideCharToMultiByte Win32 API,
specifiying CP_UTF8 as CodePage ID:


"Ryan" <> ha scritto nel messaggio
I have an ISAPI extension DLL that needs to output unicode data using
the WriteClient() function. The unicode characters are not displayed
properly. The text that is displayed in the web browser looks like
garbage even though viewing the source HTML shows Chinese characters


            DWORD dwLength;

            std::wstring html;

            html = L"<html><head><meta http-equiv='content-type'
content='text/html; charset=utf-8' /></head><body><p>?KX3?J?U</p></

            dwLength = (DWORD) html.length();

            dwLength = dwLength * sizeof(wchar_t);

            int rc = pECB->WriteClient(pECB->ConnID, (LPVOID)
html.c_str(), &dwLength, HSE_IO_SYNC);

            return HSE_REQ_DONE_WITH_SESSION;

Any help would be greatly appreciated.

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