Microsoft KB Archive/83543

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DragDrop.exe - Implementing the Drag-Drop Protocol

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Q83543

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The information in this article applies to:


 * Microsoft Windows Software Development Kit (SDK) 3.1

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SUMMARY
Windows 3.1 supports four new functions and one new message that enable an application to implement the drag-drop protocol. DragDrop.exe is a sample that demonstrates how to use all four functions and the message. When the user drags and drops a file onto Dragdrop.exe, the name of the file is added to a list box in Dragdrop.exe

MORE INFORMATION
The following files are available for download from the Microsoft Download Center:

DragDrop.exe

For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base:

"Q119591 How to Obtain Microsoft Support Files from Online Services" Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. Once posted, the file is housed on secure servers that prevent any unauthorized changes to the file.

An application that can accept files dragged from the File Manager calls the DragAcceptFiles function specifying one or more of its windows. When the user drags a file from the File Manager into the window specified in the DragAcceptFiles call, and releases the left mouse button, File Manager sends the application a WM_DROPFILES message. (File Manager sends a WM_DROPFILES message only to applications that have registered a window with DragAcceptFiles.)

One of the parameters to WM_DROPFILES contains a handle to an internal data structure. The DragQueryFile function retrieves a number of dropped files and their names from the data structure and returns this information to the application. Likewise, DragQueryPoint retrieves the position of the mouse cursor when the file(s) was dropped.

To release the memory allocated by Windows for the WM_DROPFILES data structure, the application must call the DragFinish function after it retrieves the applicable data.

Additional query words:

Keywords : kbfile kbsample kb16bitonly _IK kbGrpDSUser kbOSWin310

Issue type :

Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310