//发送文本信息
public static void sendTextMsg(string wxid, string content)
{
var msg = new ImportFromDLL.MessageStruct();
msg.wxid = wxid;
msg.content = content;
sendToWeChatHelper(msg, WM_SendTextMessage);
}
//发送底层函数
private static void sendToWeChatHelper(ImportFromDLL.MessageStruct msg, int msgtype)
{
int cbSize = Marshal.SizeOf(msg);
IntPtr StructPtr = Marshal.AllocHGlobal(cbSize);
Marshal.StructureToPtr(msg, StructPtr, true);
var c = new ImportFromDLL.COPYDATASTRUCT();
c.dwData = msgtype;
c.cbData = cbSize;
c.lpData = StructPtr;
IntPtr wechatWindowHandler = ImportFromDLL.FindWindow(helperWindows, null);
var t = ImportFromDLL.SendMessage(wechatWindowHandler, ImportFromDLL.WM_COPYDATA, (IntPtr)5, ref c);
Marshal.FreeHGlobal(StructPtr);
}