使用atlconv将BSTR字符串转换为CHAR*

李国帅2013年编

对于编写的com控件，可能使用在浏览器或者被其他语言调用，传递的是bstr字符串，com中使用的话需要转换为char*进行操作。

#include <comutil.h>#pragma comment(lib, "comsupp.lib")#pragma comment(lib, "comsuppw.lib")STDMETHODIMP CDhPlayer::TakeSnapshot(BSTR FileName, LONG* pResult){    *pResult = 0;    _bstr_t bstrVal = (_bstr_t)FileName;    *pResult = m_pDevMng->SnapshotBitmap((TCHAR*)bstrVal);    return S_OK;}#include <atlstr.h>#include <atlconv.h>using namespace ATL;#ifdef UNICODEUSES_CONVERSION;CHAR* pchDVRIP = T2A(m_pDevMng->GetDvrIP().GetString());CHAR* pchUserName = T2A(m_pDevMng->GetDvrUserName());CHAR* pchPassword = T2A(m_pDevMng->GetDvrPwd());#elseCHAR* pchDVRIP = (LPTSTR)(LPCTSTR)m_pDevMng->GetDvrIP();;CHAR* pchUserName = (LPTSTR)(LPCTSTR)m_pDevMng->GetDvrUserName();CHAR* pchPassword = (LPTSTR)(LPCTSTR)m_pDevMng->GetDvrPwd();#endif // UNICODE