The following messages are used by the DRM_OS2FILE:

• DM_RENDER

  This message is sent by a target to a source, via wpRender, to request a rendering for an object. When this message is received, the source determines if it understands the rendering mechanism and format selected by the target for the object. It also confirms that it allows the operation selected by the user for that object. The source must respond to this message before proceeding with the rendering operation.

• DM_RENDERCOMPLETE

  This message is posted by a source to a target, via wpRenderComplete, to notify the target that the rendering operation has been completed by the source, either successfully or unsuccessfully. The source can elect to let the target retry a successful or an unsuccessful operation. In this case, it should return to its state at the time of the drop for that object and indicate, in the message, that a retry is allowed. Support for this message by a source is optional. If this message is not supported, then:

  • The source must convey all necessary information to the target order to allow it to handle the rendering operation.

  • It must always indicate that native rendering is allowed when replying to a DM_RENDER message.
  
  DM_ENDCONVERSATION

  This message is sent by a target to a source to notify the source that the rendering operation is complete and that the conversation is terminated. When this message is received, the entire Drop operation for the object is complete. The source can now release any resources it had allocated to the drop and rendering operations. When the reply is received, the target can release the resources it had allocated to the operation.

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