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[COMSUPP]

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Implement _com_util::ConvertStringToBSTR and _com_util::ConvertBSTRToString (needed by _bstr_t and _variant_t classes), inspired by the remarks made in http://www.codeproject.com/Articles/1969/BUG-in-com-util-ConvertStringToBSTR-and-com-util i.e. without reproducing the bugs of MS version.

svn path=/trunk/; revision=69581
This commit is contained in:
Hermès Bélusca-Maïto 2015-10-18 01:20:20 +00:00
parent 075aa8147a
commit 698212a5a5
1 changed files with 83 additions and 0 deletions
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83
reactos/lib/sdk/comsupp/comsupp.cpp
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@ -51,3 +51,86 @@ void WINAPI _com_issue_errorex(HRESULT hr, IUnknown *punk, REFIID riid)
/* comutil.h */
_variant_t vtMissing(DISP_E_PARAMNOTFOUND, VT_ERROR);
namespace _com_util
{
BSTR WINAPI ConvertStringToBSTR(const char *pSrc)
{
DWORD cwch;
BSTR wsOut(NULL);
if (!pSrc) return NULL;
/* Compute the needed size without the NULL terminator */
cwch = ::MultiByteToWideChar(CP_ACP /* CP_UTF8 */, 0, pSrc, -1, NULL, 0);
if (cwch == 0) return NULL;
cwch--;
/* Allocate the BSTR */
wsOut = ::SysAllocStringLen(NULL, cwch);
if (!wsOut)
{
::_com_issue_error(HRESULT_FROM_WIN32(ERROR_OUTOFMEMORY));
return NULL;
}
/* Convert the string */
if (::MultiByteToWideChar(CP_ACP /* CP_UTF8 */, 0, pSrc, -1, wsOut, cwch) == 0)
{
/* We failed, clean everything up */
cwch = ::GetLastError();
::SysFreeString(wsOut);
wsOut = NULL;
::_com_issue_error(!IS_ERROR(cwch) ? HRESULT_FROM_WIN32(cwch) : cwch);
}
return wsOut;
}
char* WINAPI ConvertBSTRToString(BSTR pSrc)
{
DWORD cb, cwch;
char *szOut = NULL;
if (!pSrc) return NULL;
/* Retrieve the size of the BSTR without the NULL terminator */
cwch = ::SysStringLen(pSrc);
/* Compute the needed size with the NULL terminator */
cb = ::WideCharToMultiByte(CP_ACP /* CP_UTF8 */, 0, pSrc, cwch + 1, NULL, 0, NULL, NULL);
if (cb == 0)
{
cwch = ::GetLastError();
::_com_issue_error(!IS_ERROR(cwch) ? HRESULT_FROM_WIN32(cwch) : cwch);
return NULL;
}
/* Allocate the string */
szOut = new char[cb];
if (!szOut)
{
::_com_issue_error(HRESULT_FROM_WIN32(ERROR_OUTOFMEMORY));
return NULL;
}
/* Convert the string and NULL-terminate */
szOut[cb - 1] = '\0';
if (::WideCharToMultiByte(CP_ACP /* CP_UTF8 */, 0, pSrc, cwch + 1, szOut, cb, NULL, NULL) == 0)
{
/* We failed, clean everything up */
cwch = ::GetLastError();
delete[] szOut;
szOut = NULL;
::_com_issue_error(!IS_ERROR(cwch) ? HRESULT_FROM_WIN32(cwch) : cwch);
}
return szOut;
}
}