static Task PlatformComposeAsync(EmailMessage message)
{
var msg = default(NativeMethods.MapiMessage);
try
{
var recipCount = (message.To is object?message.To.Count : 0) + (message.Cc is object?message.Cc.Count : 0) + (message.Bcc is object?message.Bcc.Count : 0);
if (!string.IsNullOrEmpty(message.Subject))
{
msg.lpszSubject = message.Subject;
}
if (!string.IsNullOrEmpty(message.Body))
{
msg.lpszNoteText = message.Body;
}
// recipients
if (recipCount > 0)
{
var recipdesclen = Marshal.SizeOf <NativeMethods.MapiRecipDescW>();
msg.lpRecips = Marshal.AllocHGlobal(recipdesclen * recipCount);
msg.nRecipCount = recipCount;
var currentRecip = 0;
if (message.To is object)
{
foreach (var r in message.To)
{
var rd = new NativeMethods.MapiRecipDescW(r, r, NativeMethods.RecipientClass.MAPI_TO);
Marshal.StructureToPtr(rd, IntPtr.Add(msg.lpRecips, recipdesclen * currentRecip), false);
currentRecip++;
}
}
if (message.Cc is object)
{
foreach (var r in message.Cc)
{
var rd = new NativeMethods.MapiRecipDescW(r, r, NativeMethods.RecipientClass.MAPI_CC);
Marshal.StructureToPtr(rd, IntPtr.Add(msg.lpRecips, recipdesclen * currentRecip), false);
currentRecip++;
}
}
if (message.Bcc is object)
{
foreach (var r in message.Bcc)
{
var rd = new NativeMethods.MapiRecipDescW(r, r, NativeMethods.RecipientClass.MAPI_BCC);
Marshal.StructureToPtr(rd, IntPtr.Add(msg.lpRecips, recipdesclen * currentRecip), false);
currentRecip++;
}
}
}
// attachments
if (message.Attachments is object)
{
if (message.Attachments.Count > 0)
{
var fileDescLen = Marshal.SizeOf <NativeMethods.MapiFileDescW>();
msg.lpFiles = Marshal.AllocHGlobal(fileDescLen * message.Attachments.Count);
msg.nFileCount = message.Attachments.Count;
for (var i = 0; i < message.Attachments.Count; i++)
{
var f = new NativeMethods.MapiFileDescW(message.Attachments[i].FullPath, message.Attachments[i].FileName);
Marshal.StructureToPtr(f, IntPtr.Add(msg.lpFiles, fileDescLen * i), false);
}
}
}
var result = NativeMethods.MAPISendMailW(IntPtr.Zero, IntPtr.Zero, ref msg, 0xd, 0);
}
finally
{
FreeMapiMessage(msg);
}
return(Task.CompletedTask);
}
private static void ShowComposeNewEmailImpl(EmailMessage message)
{
bool useAnsi = global::System.Environment.OSVersion.Version < new Version(6, 2);
int recipCount = message.To.Count + message.CC.Count + message.Bcc.Count;
NativeMethods.MapiMessage msg = new NativeMethods.MapiMessage();
if (useAnsi)
{
if (!string.IsNullOrEmpty(message.Subject))
{
msg.lpszSubject = Marshal.StringToHGlobalAnsi(message.Subject);
}
if (!string.IsNullOrEmpty(message.Body))
{
msg.lpszNoteText = Marshal.StringToHGlobalAnsi(message.Body);
}
}
else
{
if (!string.IsNullOrEmpty(message.Subject))
{
msg.lpszSubject = Marshal.StringToHGlobalUni(message.Subject);
}
if (!string.IsNullOrEmpty(message.Body))
{
msg.lpszNoteText = Marshal.StringToHGlobalUni(message.Body);
}
}
// recipients
if (recipCount > 0)
{
int recipdesclen = Marshal.SizeOf <NativeMethods.MapiRecipDesc>();
msg.lpRecips = Marshal.AllocHGlobal(recipdesclen * recipCount);
msg.nRecipCount = recipCount;
int currentRecip = 0;
foreach (EmailRecipient r in message.To)
{
if (useAnsi)
{
var rd = new NativeMethods.MapiRecipDesc(r.Address, r.Name, NativeMethods.RecipientClass.MAPI_TO);
Marshal.StructureToPtr(rd, IntPtr.Add(msg.lpRecips, recipdesclen * currentRecip), false);
}
else
{
var rd = new NativeMethods.MapiRecipDescW(r.Address, r.Name, NativeMethods.RecipientClass.MAPI_TO);
Marshal.StructureToPtr(rd, IntPtr.Add(msg.lpRecips, recipdesclen * currentRecip), false);
}
currentRecip++;
}
foreach (EmailRecipient r in message.CC)
{
if (useAnsi)
{
var rd = new NativeMethods.MapiRecipDesc(r.Address, r.Name, NativeMethods.RecipientClass.MAPI_CC);
Marshal.StructureToPtr(rd, IntPtr.Add(msg.lpRecips, recipdesclen * currentRecip), false);
}
else
{
var rd = new NativeMethods.MapiRecipDescW(r.Address, r.Name, NativeMethods.RecipientClass.MAPI_CC);
Marshal.StructureToPtr(rd, IntPtr.Add(msg.lpRecips, recipdesclen * currentRecip), false);
}
currentRecip++;
}
foreach (EmailRecipient r in message.Bcc)
{
if (useAnsi)
{
var rd = new NativeMethods.MapiRecipDesc(r.Address, r.Name, NativeMethods.RecipientClass.MAPI_BCC);
Marshal.StructureToPtr(rd, IntPtr.Add(msg.lpRecips, recipdesclen * currentRecip), false);
}
else
{
var rd = new NativeMethods.MapiRecipDescW(r.Address, r.Name, NativeMethods.RecipientClass.MAPI_BCC);
Marshal.StructureToPtr(rd, IntPtr.Add(msg.lpRecips, recipdesclen * currentRecip), false);
}
currentRecip++;
}
}
// attachments
if (message.Attachments.Count > 0)
{
int fileDescLen = Marshal.SizeOf <NativeMethods.MapiFileDesc>();
msg.lpFiles = Marshal.AllocHGlobal(fileDescLen * message.Attachments.Count);
msg.nFileCount = message.Attachments.Count;
for (int i = 0; i < message.Attachments.Count; i++)
{
if (useAnsi)
{
NativeMethods.MapiFileDesc f = new Email.EmailManager.NativeMethods.MapiFileDesc(message.Attachments[i].Data.Path, message.Attachments[i].FileName);
Marshal.StructureToPtr(f, IntPtr.Add(msg.lpFiles, fileDescLen * i), false);
}
else
{
NativeMethods.MapiFileDescW f = new Email.EmailManager.NativeMethods.MapiFileDescW(message.Attachments[i].Data.Path, message.Attachments[i].FileName);
Marshal.StructureToPtr(f, IntPtr.Add(msg.lpFiles, fileDescLen * i), false);
}
}
}
if (useAnsi)
{
uint result = NativeMethods.MAPISendMail(IntPtr.Zero, IntPtr.Zero, ref msg, 0xd, 0);
}
else
{
uint result = NativeMethods.MAPISendMailW(IntPtr.Zero, IntPtr.Zero, ref msg, 0xd, 0);
}
FreeMapiMessage(msg);
}