Drag the file onto the form and get its full path "implementation under C + + Builder" goes

1. Declare the handler function and the message map in the form's header file. h, for example:

[CPP]View PlainCopy

1. Class TForm1: Public tform
2. {
3. ...
4. void __fastcall handledropfiles (tmessage &Owner;
5. ...
6. Begin_message_map
7. Message_handler (Wm_dropfiles,tmessage,handledropfiles)
8. End_message_map (Tform)
9. };

2. In the form's implementation file. CPP, add the code

In the Formcreate event response:

[CPP]View PlainCopy

1. void __fastcall tform1::formcreate (tobject *sender)
2. {
3. ...
4. DragAcceptFiles (Handle,true);
5. ...
6. }

The most important processing function is handledropfiles:

[CPP]View PlainCopy

2. void __fastcall tform1::handledropfiles (tmessage &msg)
4. {
6. Char Filename[_max_path];
8. int i, Sum;
10. //Get the number of dragged files, this function is determined by the second parameter
12. Sum = Dragqueryfile (hdrop (msg).  WParam), 0xFFFFFFFF, NULL, 0);
14. if (Sum > 0)
16. {
18. //Here as long as the first file
20. Dragqueryfile (hdrop (msg.  WParam), 0, FileName, _max_path);
22. //Display the file path to the text control on the form
24. Txtpath->text = ansistring (FileName);
26. }
28. //Releases the memory space that the application opens up to pass the file name
30. Dragfinish ( hdrop (msg.  WParam));
32. }

Drag the file onto the form and get its full path "implementation under C + + Builder" goes