FILE: DDP_Text Not implemented for COleDateTime and COleCurrency

• The Microsoft Foundation Classes (MFC) included with: - Microsoft Visual C++, 32-bit Editions, version 5.0

SUMMARY

DDP_Text functions for COleCurrency and COleDateTime are not implemented in MFC. However code that uses these functions is added to DoDataExchange when ClassWizard is used to associate a CURRENCY or DATE property with a control on a property page. This results in the following compilation errors.

For CURRENCY property:

   <filename(lineno)> : error C2665: 'DDP_Text' : none of the 9 overloads
      can convert parameter 3 from type 'class COleCurrency'

   <filename(lineno)> : error C2665: 'DDP_Text' : none of the 9 overloads
      can convert parameter 3 from type 'class COleDateTime'

DdpText.exe extracts a Visual C++ 5.0 ActiveX control project. It contains code for overrides of DDP_Text for COleCurrency and COleDateTime.

The following file is available for download from the Microsoft Software Library:

 ~ DdpText.exe (size: 35235 bytes) 

   ARTICLE-ID: Q119591
   TITLE     : How to Obtain Microsoft Support Files from Online Services

MORE INFORMATION

When you associate CURRENCY and DATE properties with edit controls on a property page, ClassWizard adds the following member variables to the COlePropertyPage derived class:

   COleCurrency m_Currency;
   COleDateTime m_Date;

   DDP_Text(pDX, IDC_CURRENCY, m_Currency, _T("CurrencyProp") );
   DDX_Text(pDX, IDC_CURRENCY, m_Currency);
   DDP_Text(pDX, IDC_DATE, m_Date, _T("DateProp") );
   DDX_Text(pDX, IDC_DATE, m_Date);

To use the code in the sample it is necessary to derive your code from CMyOlePropertyPage instead of COlePropertyPage. The project also has code for CMyOlePropertyPage.

MyPropPg.h and MyPropPg.cpp have the code required to add code for DDP_Text to your project. Add these files to your project.

Use ClassWizard to associate properties with controls on your property page. Now modify the property page class so that it is derived from CMyOlePropertyPage. The following steps are required:

1. Add the following line to your property page header file:

         #include "MyPropPg.h"
   

2. Replace all instances of COlePropertyPage in the header and .CPP file for your project with CMyOlePropertyPage.