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I wanted to be able to easily email a file from a utility I wrote, and thought “wouldn’t it be so much easier if I could incorporate the ‘Sent To Mail Receipient’ functionality available within Windows” so I didn’t have to worry about which email application is actually installed. I know this will typically limit this to either Microsoft Outlook Express or Microsoft Outlook, but at least I don’t have to worry about the mechanism required to create an email with an attachment which is yet to be sent.
So the following is the C++ code which implements createEmailWithAttachment().
The GetUIObjectOfFile() routine is taken from Raymand Chen’s blog where he posted How to host an IContextMenu, part 1.
The droptarget code was taken from a discussion thread which was incomplete.
Unicode and non-unicode variants are supported.
HRESULT GetUIObjectOfFile(HWND hwnd, LPCWSTR pszPath, REFIID riid,
void **ppv)
{
*ppv = NULL;
HRESULT hr;
LPITEMIDLIST pidl;
SFGAOF sfgao;
hr = SHParseDisplayName(pszPath, NULL, &pidl, 0, &sfgao);
if (SUCCEEDED(hr))
{
IShellFolder *psf;
LPCITEMIDLIST pidlChild;
hr = SHBindToParent(pidl, IID_IShellFolder, (void**)&psf,
&pidlChild);
if (SUCCEEDED(hr))
{
hr = psf->GetUIObjectOf(hwnd, 1, &pidlChild, riid, NULL, ppv);
psf->Release();
}
CoTaskMemFree(pidl);
}
return hr;
}
#ifdef DEFINE_GUID
#undef DEFINE_GUID
#endif
#define DEFINE_GUID(name, l, w1, w2, b1, b2, b3, b4, b5, b6, b7, b8)
EXTERN_C const GUID name
= { l, w1, w2, { b1, b2, b3, b4, b5, b6, b7, b8 } }
DEFINE_GUID(CLSID_SendMail, 0x9E56BE60, 0xC50F, 0x11CF, 0x9A, 0x2C, 0x00,
0xA0, 0xC9, 0x0A, 0x90, 0xCE);
static HRESULT createEmailWithAttachment(LPCTSTR pszFileName)
{
IDataObject *pDataObject = NULL;
IDropTarget *pDropTarget = NULL;
LPCWSTR pwszFileName = NULL;
bool bCreated = false;
HRESULT hr;
#ifdef UNICODE
pwszFileName = pszFileName;
#else
WCHAR *pwszBuffer = NULL;
int nLength = MultiByteToWideChar(CP_ACP, 0, pszFileName,
strlen(pszFileName), NULL, 0);
if (nLength DragEnter(pDataObject, MK_LBUTTON, pt, &dwEffect);
if (SUCCEEDED(hr))
{
hr = pDropTarget->Drop(pDataObject, MK_LBUTTON, pt, &dwEffect);
if (SUCCEEDED(hr))
bCreated = true;
}
pDropTarget->Release();
}
#ifndef UNICODE
free(pwszBuffer);
#endif // UNICODE
pDataObject->Release();
}
return hr;
}
