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Drag and Drop in a Dialog

, 6 Dec 2012 CPOL
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Simple Drag and Drop functionality in a dialog.


Here is a simple method to have a Drag and Drop feature in your dialog based applications. To provide Drag and Drop we have a Windows Message Handler called WM_DROPFILES. Handle this message through the ON_MESSAGE message map to capture the dropped files.

Message Handler

 BEGIN_MESSAGE_MAP(CComGuidFinderDlg, CDialog)
  ON_MESSAGE(WM_DROPFILES,OnDropFiles)// Message Handler for Drang and Drop

Now it is time to handle the WM_DROPFILES messages through a user defined method. The function prototype should be like this:

LRESULT  OnDropFiles(WPARAM wParam,LPARAM lParam);

Finally we have a function to capture the drop events. wParam is a handle to the HDROP structure describing the dropped files. To get info about the dropped file, i.e., the file name used:

DragQueryFile(hDrop,    // Struture Identifier
        -1,        // -1 to Drop more than one file or ( integer 0 to max )
                   // to drop selected No of files
        szDroppedFile,// Droped File Name
        MAX_PATH);   // Max char

So now we have done all possible coding in our dialog based application to handle the Drag & Drop feature. But still it is handicapped. Handling the Drop event is not enough to ensure the Drag & Drop feature. We need to register our window to accept the dropped file using:

BOOL CComGuidFinderDlg::OnInitDialog()
  DragAcceptFiles(TRUE) // To Accept Dropped file Set this TRUE

Good... That's all, and we have done well!

I added one more feature in this sample, i.e., moving our dialog by clicking on anywhere on the window. This can be done by posting the WM_NCLBUTTONDOWN message to HTCAPTION handle this statement in OnLButtonDownMessage(...) .



This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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Comments and Discussions

GeneralRe: DragAcceptFile Pin
jibesh6-Dec-12 11:03
memberjibesh6-Dec-12 11:03 
GeneralSolution: How to move your dialog by clicking on anywhere on the window in a Win32 API Non MFC App Pin
cffhgfdf22-Sep-06 1:34
membercffhgfdf22-Sep-06 1:34 
Generalsimple, good, usable Pin
MessnerEW11-Oct-04 20:21
memberMessnerEW11-Oct-04 20:21 
GeneralI really like the simplicity Pin
hockeyman13-Sep-04 8:26
memberhockeyman13-Sep-04 8:26 
GeneralRe: I really like the simplicity Pin
hockeyman13-Sep-04 8:31
memberhockeyman13-Sep-04 8:31 
Generalgood job Pin
shaitan18@yahoo.com18-Feb-04 10:32
membershaitan18@yahoo.com18-Feb-04 10:32 
QuestionWhom this article is targeted? Pin
super18-Nov-03 20:14
membersuper18-Nov-03 20:14 
AnswerRe: Whom this article is targeted? Pin
jibesh18-Nov-03 20:35
memberjibesh18-Nov-03 20:35 
GeneralRe: Whom this article is targeted? Pin
armentage19-Nov-03 3:50
memberarmentage19-Nov-03 3:50 
GeneralRe: Whom this article is targeted? Pin
jibesh19-Nov-03 4:20
memberjibesh19-Nov-03 4:20 
QuestionHow the rating is found? Pin
kezhu18-Nov-03 12:18
memberkezhu18-Nov-03 12:18 
AnswerRe: How the rating is found? Pin
Alex Farber19-Nov-03 6:44
memberAlex Farber19-Nov-03 6:44 
GeneralMissing File. Pin
WREY17-Nov-03 20:22
memberWREY17-Nov-03 20:22 
GeneralRe: Missing File. Pin
jibesh17-Nov-03 20:34
memberjibesh17-Nov-03 20:34 

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