在前面的文章《Barcode Xpress 教程：如何在Visual C++ 中作為COM 對象使用》的前兩篇文章中，對于在Visual C++中如何將Barcode Xpress作為一個導入的COM 對象使用的給出了部分示例代碼，下面將給出最后的示例代碼。

五、使用BarcodeXpress的COM對象來設置屬性和調(diào)用方法

    BarcodeXpress COM對象實例創(chuàng)建之后，這個對象可以用于設置BarcodeXpress屬性和調(diào)用BarcodeXpress方法。在ReadBarcodeFromDIB項目中，會在OnDetectButton函數(shù)中像下面這樣子說明。當用戶點擊Recognized Barcode 按鈕時就會調(diào)用這個函數(shù)。

void CReadBarcodeFromDIBDlg::OnDetectButton()
{
// TODO: Add your control notification handler code here
// Set barcode classification type based on selected radio button
switch(m_selection)
{
case 0:
{
barcodetype = 0; //1D
break;
}
case 1:
{
barcodetype = 524288; //Patch
break;
}
case 2:
{
barcodetype = 0x4000000; //OneCode
break;
}
case 3:
{
barcodetype = 2097152; //PDF
break;
}
case 4:
{
barcodetype = 4194304; //DataMatrix
break;
}
case 5:
{
barcodetype = 0x8000000; //Royal Post
break;
}
case 6:
{
barcodetype = 1048576; //Post net
break;
}
case 7:
{
barcodetype = 0x2000000; //QR
break;
}
case 8:
{
barcodetype = 0x10000000; //Aus
break;
}
}
 
m_pBarcodeXpress->BarcodeType = barcodetype;
 
m_pBarcodeXpress->ImageSource = BC_ImageSourceDIB;
m_pBarcodeXpress->hDIB = m_pImagXpress->CopyDIB();
m_pBarcodeXpress->AnalyzeBC(0,0,0,0);
int numBC = m_pBarcodeXpress->NumBarcodes;
CString bcName;
CString bcResult;
CString result;
CString strBarcodeInformation;
 
if ((m_pBarcodeXpress->SSError == 0) & (m_pBarcodeXpress->NumBarcodes > 0))
{
int i;
for (i = 0 ; i < numBC ; i++)
{
m_pBarcodeXpress->GetBarcode(i);
bcName = (BSTR) m_pBarcodeXpress->BarcodeCodeName;
bcResult = (BSTR) m_pBarcodeXpress->BarcodeResult;
strBarcodeInformation.FormatMessage(szBarcodeInfoFormat, i, bcResult, bcName);
result += strBarcodeInformation;
}
MessageBox(result,"Barcode Result", MB_OK);
}
else
{
if (m_pBarcodeXpress->SSError != 0)
{
MessageBox("Error #" + m_pBarcodeXpress->SSError,"Error",MB_OK);
}
else
{
MessageBox("No barcodes found","Barcode Result", MB_OK);
}
}
//Must Free the DIB passed into the Analyze method to avoid memory issues
GlobalFree((HGLOBAL)m_pBarcodeXpress->hDIB);
}

六、刪除BarcodeXpress COM對象

     當不再需要BarcodeXpress COM對象時，就必須刪除它。通常在應用程序退出之前刪除這個對象。在ReadBarcodeFromDIB項目中，這個COM對象可以像下面這樣刪除。

BOOL CReadBarcodeFromDIBDlg::DestroyWindow()
{
// TODO: Add your specialized code here and/or call the base class
CDialog::OnDestroy();
if (m_pImagXpress)
{
m_pImagXpress = NULL;
if (m_ppCImagXpress)
{
delete m_ppCImagXpress;
}
}
if (m_pBarcodeXpress)
{
m_pBarcodeXpress = NULL;
if (m_ppIBarcodeXpress)
{
delete m_ppIBarcodeXpress;
}
}
return CDialog::DestroyWindow();
}

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