When placing a clipboard format on the clipboard, a window can delay rendering the data in that format until the data is needed. For more information about this alternative format, see Owner Display Format.
#Developer of 1clipboard free#
In response to the WM_DESTROYCLIPBOARD message, the window might free resources it had used to display information in the clipboard viewer window. The window placed data on the clipboard using the CF_OWNERDISPLAY clipboard format.For more information about private clipboard formats, see Clipboard Formats. Therefore, the clipboard owner should free the data upon receiving the WM_DESTROYCLIPBOARD message. The data for private clipboard formats is not freed by the system when the clipboard is emptied. The window placed data on the clipboard in a private clipboard format.For more information about the rendering of data, see Delayed Rendering. In response to the WM_DESTROYCLIPBOARD message, the window might free resources it had allocated in order to render data on request. The window delayed rendering of one or more clipboard formats.Following are some reasons why a window might process this message: When the clipboard is emptied, the clipboard owner receives a WM_DESTROYCLIPBOARD message. The window remains the clipboard owner until it is closed or another window empties the clipboard. A window becomes the clipboard owner when it places data on the clipboard, specifically, when it calls the Empt圜lipboard function.
The clipboard owner is the window associated with the information on the clipboard. However, a window should not free the object or leave it locked for a long period of time. A window can briefly lock the memory object in order to examine or copy the data. This function returns the handle to a global memory object containing data in the specified format. A window that recognizes only one clipboard format can simply determine whether that format is available by using the IsClipboardFormatAvailable function.Īfter determining the clipboard format to use, a window calls the GetClipboardData function. This function identifies the best available clipboard format according to a specified priority. This method selects the best available format according to the priority set when the data was placed on the clipboard.Īlternatively, a window can use the GetPriorit圜lipboardFormat function. Typically, a window enumerates the available clipboard formats by using the EnumClipboardFormats function and uses the first format it recognizes. To retrieve paste information from the clipboard, a window first determines the clipboard format to retrieve. For more information, see Delayed Rendering. The memory handle can be NULL, indicating that the window renders the data on request. For each format, the window calls the SetClipboardData function, specifying the format identifier and a global memory handle. To find out which window owns the clipboard, call the GetClipboardOwner function.Īfter emptying the clipboard, the window places data on the clipboard in as many clipboard formats as possible, ordered from the most descriptive clipboard format to the least descriptive. This function sends the WM_DESTROYCLIPBOARD message to the previous clipboard owner, frees resources associated with data on the clipboard, and assigns clipboard ownership to the window that has the clipboard open.
To place information on the clipboard, a window first clears any previous clipboard content by using the Empt圜lipboard function. The following topics are discussed in this section. When it has finished, the window must close the clipboard by calling the CloseClipboard function. To find out which window has the clipboard open, call the GetOpenClipboardWindow function. Only one window can have the clipboard open at a time. To place data on or retrieve data from the clipboard, a window must first open the clipboard by using the OpenClipboard function. The following sections describe these operations and related issues. A window places data on the clipboard for cut and copy operations and retrieves data from the clipboard for paste operations. A window should use the clipboard when cutting, copying, or pasting data.
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