漫谈WinCE的手写识别技术(二)

GetProcAddress(hInstDll,TEXT(HwxDestroy));

HWXENDINPUT = (DLL_HWXENDINPUT) GetProcAddress(hInstDll,TEXT(HwxEndInput));

}

else

{

return FALSE;

}

#endif //RECOGNIZE_FUNCTION_FROM_DLL

if(HWXCONFIG() == FALSE)

{

return FALSE;

}

return TRUE;

}

//-----------------------------------------------------------------------

//Descriptiong:

// Begin recognizing

//-----------------------------------------------------------------------

BOOL CRecognizer::BeginRecognize()

{

BOOL bRes = FALSE;

m_hrc = HWXCREATE();

if(m_hrc == NULL)

{

goto END;

}

bRes = HWXSETGUIDE(m_hrc,m_hwxGuide);

if(bRes == FALSE)

{

goto END;

}

bRes = HWXALCVALID(m_hrc,m_alc);

if(bRes == FALSE)

{

goto END;

}

bRes = TRUE;

END:

return bRes;

}

//-----------------------------------------------------------------------

//Descriptiong:

// End recognizing

BOOL CRecognizer::EndRecognize()

{

BOOL bRes = FALSE;

//Destroy the recognizer

if(HWXDESTROY(m_hrc) == FALSE)

{

goto END;

}

bRes = TRUE;

END:

return bRes;

}

//Descriptiong:

// Get the character

//Parameters:

// pWchar: [out] The character get to be stored

// iCount: [in] The number of pWchar

//Return Values:

// 0: Failed

// >0: The number of the characters to return

int CRecognizer::GetCharacter(WCHAR *pWchar, int iCount)

{

int iGetNum = 0;

int i = 0;

HWXRESULTS *phwxResults;

//Because each HWXRESULTS after the first one could store two characters,

//so only allocate (iCount / 2 + 1)

int iNum = iCount / 2 + 1;

phwxResults = new HWXRESULTS[iNum];

memset(phwxResults,0,iNum * sizeof(HWXRESULTS));

//End the input

if(HWXENDINPUT(m_hrc) == FALSE)

{

goto END;

}

//Analyze the information

if(HWXPROCESS(m_hrc) == FALSE)

{

goto END;

}

//Get the character from recognizer

if(HWXGETRESULTS(m_hrc,iCount,0,1,phwxResults) == FALSE)

{

goto END;

}

//Set the character to the stored buffer

for(i = 0; i iNum; i++)

{

if(i == 0)

{

if(phwxResults[i].rgChar[0] != 0)

{

pWchar[iGetNum ++] = phwxResults[i].rgChar[0];

}

else

{

break;

}

}

else

{

//The indxBox member also store the character

if(phwxResults[i].indxBox != 0)

{

pWchar[iGetNum ++] = phwxResults[i].indxBox ;

}

else

{

break;

}

if(phwxResults[i].rgChar[0] != 0)

{

pWchar[iGetNum ++] = phwxResults[i].rgChar[0];

}

else

{

break;

}

}

}

END:

if(phwxResults != NULL)

{

delete [] phwxResults;

}

return iGetNum;

}

//Descriptiong:

// Input the stroke

//Parameter:

// lpPnt: [in] Pointer to the stroke POINT

// iCount: [in] The count of the lpPnt

// scale: [in] The scale base of lpPnt

BOOL CRecognizer::InputStroke(POINT *lpPnt, int iCount, ScaleType scale)

{

BOOL bRes = FALSE;

int i = 0;

POINT *pt;

pt = new POINT[iCount];

if(pt == NULL)

{

goto END;

}

for(i = 0; i iCount; i++)

{

pt[i] = lpPnt[i];

if(scale == SCALE_APPWND)

{

//Convert to the screen scale

pt[i].x *= 4;

pt[i].y *= 4;

MapWindowPoints(m_hWndRecog, HWND_DESKTOP, pt[i], 1);

}

}

//Input stroke

bRes = HWXINPUT(m_hrc,pt,iCount,0);

if(bRes == FALSE)

{

goto END;

}

bRes = TRUE;

END:

if(pt != NULL)

{

delete [] pt;

}

return bRes;

}

不知道大家看到这段代码有什么感觉,反正我是挺高兴的,因为让我从繁琐的识别过程中脱离出来.

关于代码,也许最让人疑惑的可能是这两个宏:RECOGNIZE_FUNCTION_FROM_DLL,RECOGNIZE_FUNCTION_FROM_LIB.

顾名思义,RECOGNIZE_FUNCTION_FROM_DLL表明识别函数调用是来源于动态链接库(DLL),同理,RECOGNIZE_FUNCTION_FROM_LIB则是编译的时候链接到lib库.为什么需要定义这两个宏呢?因为在标准的SDK下,如果直接包含recog.h后调用相关识别函数,是会报link错误.因为标准的SDK是不包含任何手写识别组件的.从调试的便利性来说,这时候如果只拷贝识别库到模拟器就可以顺利测试程序,绝对比重新定制一个包含手写识别引擎的系统要来得方便.

在示例代码中,因为是识别繁体中文,所以包含的动态链接库为:hwxcht.dll.如果需要识别其它文字,则只要更改该动态链接库名称即可.当然,还要更改DEFAULT_ALC宏,这个宏定义了识别的范围.

因为示例代码中的识别函数全部是宏定义,具体意义根据函数