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NativeClipboard.SetData related API takes no effect

See original GitHub issue

Describe the bug and how to reproduce Just like the code what I provided below

What code is involved

using (NativeClipboard Clipboard = new NativeClipboard(true))
{
       Clipboard.SetText("12333333");
}

//Check system clipboard: No content like "12333333"

Expected behavior Looks like the content did not write down to clipboard

Issue Analytics

State:
Created 9 months ago
Comments:47 (47 by maintainers)

Top GitHub Comments

1reaction

zhuxb711commented, Jan 29, 2023

It looks great, thanks for your work. The last suggestion is

Design the API like this: NativeClipboard.CreateIDataObjectFromShellItems(params ShellItem[] Items)

if Items.Length == 0, just call NativeClipboard.CreateEmptyIDataObject()

It makes the user easier to use the API if they want to set ShellItems (even they passed an empty array)

0reactions

dahallcommented, Feb 5, 2023

I hate loose ends, so today I wrote the following and confirmed that something is wrong with OleSetClipboard.

HRESULT hr = OleInitialize(NULL);

auto id0 = RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW);
auto id = RegisterClipboardFormat(CFSTR_FILECONTENTS);

IDataObject* pDataObj;
if (SUCCEEDED(hr = SHCreateDataObject(NULL, 0, NULL, NULL, IID_PPV_ARGS(&pDataObj))))
{
	FORMATETC fmt0 = { id0, NULL, DVASPECT::DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
	FILEDESCRIPTORW fd0 = { FD_FILESIZE };
	//fd0.nFileSizeLow = 445;
	lstrcpy(fd0.cFileName, L"C:\\Temp\\test.txt");
	auto hMem = GlobalAlloc(GMEM_MOVEABLE, sizeof(fd0));
	auto ptr = GlobalLock(hMem);
	memcpy(ptr, &fd0, sizeof(fd0));
	GlobalUnlock(hMem);
	STGMEDIUM medium0 = { TYMED_HGLOBAL };
	medium0.hGlobal = hMem;
	hr = pDataObj->SetData(&fmt0, &medium0, TRUE);

	FORMATETC fmt = { id, NULL, DVASPECT::DVASPECT_CONTENT, 0, TYMED_ISTREAM };
	STGMEDIUM medium = { TYMED_ISTREAM };
	IStream* pStream;
	if (SUCCEEDED(hr = SHCreateStreamOnFileW(L"C:\\Temp\\test.txt", STGM_READWRITE, &pStream)))
	{
		medium.pstm = pStream;
		if (SUCCEEDED(hr = pDataObj->SetData(&fmt, &medium, TRUE)))
		{
			hr = OleSetClipboard(pDataObj);
			hr = OleFlushClipboard();
		}
		pStream->Release();
	}
	pDataObj->Release();
	pDataObj = NULL;
}

if (SUCCEEDED(hr = OleGetClipboard(&pDataObj)))
{
	FORMATETC fmt = { id, NULL, DVASPECT::DVASPECT_CONTENT, 0, TYMED_ISTREAM | TYMED_HGLOBAL | TYMED_ISTORAGE };
	hr = pDataObj->QueryGetData(&fmt);
	std::cout << "HR = " << hr << std::endl; // This returns the same FORMATETC error as C#
}

OleUninitialize();