COleDataSource::CacheData

  • 项目

voidCacheData(CLIPFORMATcfFormat**,LPSTGMEDIUMlpStgMedium,LPFORMATETClpFormatEtc=NULL);**

Parameters

cfFormat

The Clipboard format in which the data is to be offered. This parameter can be one of the predefined Clipboard formats or the value returned by the native Windows function.

lpStgMedium

Points to a structure containing the data in the format specified.

lpFormatEtc

Points to a structure describing the format in which the data is to be offered. Provide a value for this parameter if you want to specify additional format information beyond the Clipboard format specified by cfFormat. If it is NULL, default values are used for the other fields in the FORMATETC structure.

Remarks

Call this function to specify a format in which data is offered during data transfer operations. You must supply the data, because this function provides it by using immediate rendering. The data is cached until needed.

Supply the data using a structure. You can also use the CacheGlobalData member function if the amount of data you are supplying is small enough to be transferred efficiently using an HGLOBAL. 

After the call to CacheData the ptd member of lpFormatEtc and the contents of lpStgMedium are owned by the data object, not by the caller.

To use delayed rendering, call the DelayRenderData or DelayRenderFileData member function. For more information on delayed rendering as handled by MFC, see the article in Visual C++ Programmer’s Guide.

For more information, see the and structures in the OLE 2 Programmer’s Reference, Volume 1.

For more information, see in the Win32 documentation.

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See Also   COleDataSource::CacheGlobalData, COleDataSource::DelayRenderData, COleDataSource::DelayRenderFileData, COleDataSource::SetClipboard, COleDataSource::DoDragDrop