fmx-drag-and-drop/Unit1.cpp

//---------------------------------------------------------------------------

#include <fmx.h>
#pragma hdrstop
#include <FMX.Platform.Win.hpp>
#include <ShellAPI.h>
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.fmx"

#if _WIN64
#define Parm GWLP_WNDPROC
#elif _WIN32
#define Parm GWL_WNDPROC
#elif __APPLE__
  // macOS
#else
  #error Not a supported platform
#endif

TForm1 *Form1;
//---------------------------------------------------------------------------

/*
void __fastcall TForm1::msg_hnd(TWMDropFiles Msg)
{
	 int count;
	 int i;
	 char fname[256];

	 count=DragQueryFile((HDROP)Msg.Drop, 0xFFFFFFFF, NULL, 255);
	 DragQueryFile((HDROP)Msg.Drop, 0, fname, 255);
	 ///<EFBFBD>t<EFBFBD>@<EFBFBD>C<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>(fname);
	 Memo1->Lines->Add(fname);
	 if (count>1) {
		for(i=1;i<count;i++) {
			DragQueryFile((HDROP)Msg.Drop, i, fname, 255);
			//<EFBFBD>t<EFBFBD>@<EFBFBD>C<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>2(fname)
			Memo1->Lines->Add(fname);
		 }
	 }
	 DragFinish((HDROP)Msg.Drop);		// <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>J<EFBFBD><EFBFBD>
}
*/

	HWND m_Hwnd;

	WNDPROC m_WndOldProc;

	long m_OldWndProc;



LRESULT CALLBACK WndProc(HWND hWnd,UINT Msg,WPARAM wParam,LPARAM lParam)
{
	int count;
	 int i;
	 char fname[256];


	if(Msg == WM_DROPFILES){

		//ShowMessage("drop files fired and catched");

	 count=DragQueryFile((HDROP)wParam, 0xFFFFFFFF, NULL, 255);
	 DragQueryFile((HDROP)wParam, 0, fname, 255);
	 ///<EFBFBD>t<EFBFBD>@<EFBFBD>C<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>(fname);
	 Form1->Memo1->Lines->Add(fname);
	 if (count>1) {
		for(i=1;i<count;i++) {
			DragQueryFile((HDROP)wParam, i, fname, 255);
			//<EFBFBD>t<EFBFBD>@<EFBFBD>C<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>2(fname)
			Form1->Memo1->Lines->Add(fname);
		 }
	 }
	 DragFinish((HDROP)wParam);

	}



	return CallWindowProc(m_WndOldProc,hWnd,Msg,wParam,lParam);

}

__fastcall TForm1::TForm1(TComponent* Owner)
	: TForm(Owner)
{


	m_Hwnd = Fmx::Platform::Win::FormToHWND(Form1);
	DragAcceptFiles(m_Hwnd,true);

	m_OldWndProc = GetWindowLongPtr(m_Hwnd, Parm);
	m_WndOldProc = (WNDPROC)SetWindowLongPtr(m_Hwnd, Parm,(LONG)WndProc);

}

void __fastcall TForm1::FormClose(TObject *Sender, TCloseAction &Action)
{
	SetWindowLongPtr(m_Hwnd,Parm,m_OldWndProc);
}