截取中文输入法输入的字符串，更改编码为ANSI-优快云博客

本文介绍了一种在全英文版Windows XP系统中，针对非Unicode程序中中文输入显示为“？？”的问题解决方案。通过截获WM_IME_COMPOSITION消息并利用ImmGetCompositionStringW及WideCharToMultiByte等函数将Unicode转换为ANSI编码，从而实现正确显示中文。

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在全英文的XP中，在非unicode的程序中输入的中文会转为“？？”。

通过截获WM_IME_COMPOSITION消息得到输入的字符串
ImmGetCompositionStringW得到Unicode
WideCharToMultiByte转换为ANSI


BOOL CchartestDlg::PreTranslateMessage(MSG* pMsg)
{
	if (pMsg->message == WM_IME_COMPOSITION)
	{
		HIMC hIMC;
		HWND hWnd=pMsg->hwnd;
		DWORD dwSize;
		WCHAR lpWideStr[20];

		hIMC = ImmGetContext(hWnd);

		dwSize = ImmGetCompositionStringW(hIMC, GCS_RESULTSTR, NULL, 0);

		dwSize += sizeof(WCHAR);

		memset(lpWideStr, 0, 20);

		//get string in Unicode
		ImmGetCompositionStringW(hIMC, GCS_RESULTSTR, lpWideStr, dwSize);

		//transfer to ANSI code
		int   iSize;
		LPSTR   pszMultiByte;
		int ChineseSimpleAcp = 936;

		iSize = WideCharToMultiByte(ChineseSimpleAcp,0,lpWideStr,-1,NULL,0, NULL,NULL);

		pszMultiByte = new char[iSize+1]/**sizeof(char)*/;

		WideCharToMultiByte(ChineseSimpleAcp, 0, lpWideStr, -1,	pszMultiByte, iSize, NULL, NULL );

		CString strText = pszMultiByte;

		delete pszMultiByte;

		ImmReleaseContext(hWnd, hIMC);

		return TRUE;
	}

	return Default();	
}