CFSTR_FILEDESCRIPTORで実在しないファイルをエクスプローラへドラッグ&ドロップする実験 (Windows Forms)

FileDescriptorTest-Forms.cpp

#define UNICODE
#define _UNICODE

#define _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES 1
#define _CRT_SECURE_CPP_OVERLOAD_SECURE_NAMES 1

#define WINVER 0x0600
#define _WIN32_WINNT 0x0600

#include <string.h>

#include <Windows.h>
#include <ShlObj.h>

#using <System.dll>
#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::IO;
using namespace System::Windows::Forms;

DataObject^ GetFileDescriptorAndContent()
{
	auto dataObj = gcnew DataObject;
	auto buffer = gcnew array<BYTE>(sizeof FILEGROUPDESCRIPTOR);
	pin_ptr<BYTE> p = &buffer[0];
	auto fileGroupDescriptor = reinterpret_cast<FILEGROUPDESCRIPTOR*>(p);
	fileGroupDescriptor->cItems = 1;
	fileGroupDescriptor->fgd[0].dwFlags = static_cast<DWORD>(FD_PROGRESSUI | FD_UNICODE);
	wcscpy_s(fileGroupDescriptor->fgd[0].cFileName, L"test.txt");
	dataObj->SetData(CFSTR_FILEDESCRIPTOR, gcnew MemoryStream(buffer));

	auto data = gcnew array<BYTE> { 'a', 'b', 'c' };
	auto content = gcnew MemoryStream;
	content->Write(data, 0, data->Length);
	dataObj->SetData(CFSTR_FILECONTENTS, content);

	return dataObj;
}

void OnMouseDown(Object^ sender, MouseEventArgs^ e)
{
	if ((e->Button & MouseButtons::Left) != MouseButtons())
	{
		safe_cast<Control^>(sender)->DoDragDrop(GetFileDescriptorAndContent(), DragDropEffects::Copy);
	}
}

[STAThread]
int main()
{
	auto f = gcnew Form;
	f->MouseDown += gcnew MouseEventHandler(OnMouseDown);
	Application::Run(f);
}