C / C++ / MFC

<br />
#pragma data_seg("shared")<br />
HHOOK m_hHook=NULL;<br />
ISpVoice * pVoice = NULL;<br />
HRESULT hr =NULL;<br />
#pragma data_seg()<br />
#pragma comment(linker,"/section:shared,rws")<br />
//defien some var for shared<br />
HINSTANCE glhInstance=NULL;<br />
//<big>define the global var and the glhInstance will init the </big><br />
//<big>function InitInstance()</big><br />
<br />
.................<br />
BOOL CHookKBDApp::InitInstance() <br />
{<br />
	glhInstance=::AfxGetInstanceHandle();<br />
	if (FAILED(CoInitialize(NULL)))<br />
    {<br />
        AfxMessageBox("Error to intiliaze COM");<br />
        return	FALSE;	<br />
    }<br />
	return CWinApp::InitInstance();<br />
}<br />
////////////////////<br />
..............<br />
StartHook()<br />
{<br />
...<br />
	m_hHook=::SetWindowsHookEx(WH_CALLWNDPROC,CallWndProc,glhInstance,0);<br />
......<br />
//I set a global hook to get the message WM_IME_COMPOSITION<br />
//because I won't read the english ,just chinese<br />
<br />
//in the CallWndProc function there are some problem!<br />
LRESULT CALLBACK CallWndProc(int nCode,  WPARAM wParam,  LPARAM lParam  )<br />
{<br />
//When Message WM_IME_COMPOSITION occured <br />
//I use following code to read the string<br />
if( SUCCEEDED( hr ) )<br />
				{<br />
					hr = pVoice->Speak(test.AllocSysString(),SPF_DEFAULT,NULL);							<br />
				}<br />
//test is the string I got<br />
//and each time I typed some chinese in other program<br />
//the function pVoice->Speak(test.AllocSysString(),SPF_DEFAULT,NULL);	<br />
//will throw out a error <br />
//just as "the memory address 0x00000 can be read"<br />
//but why?the string test is right!<br />
}<br />
<br />