C#

[DllImport( "DCamLIB.dll" )]private unsafe static extern bool DcamCapture( IntPtr imageBuffer, Int32 bufferSize );


IntPtr ShortVariable = Marshal.AllocHGlobal(4);

DcamCapture( ShortVariable, bufferSize );

Int16 Result = Marshal.ReadInt16( ShortVariable );

unsafe public int ArrayFixed() {
    int dim=1000;
    int[] numbers=new int[dim];
    ...
    int sum;
    fixed (int* pNumbers=&numbers[0]) {
        sum=SumArray(pNumbers, dim);
    }
    return sum;
}

[DllImport("native.dll")]
unsafe public static extern int SumArray(int* pNumbers, int count);

public int ArrayHandle() {
    int dim=10000;
    int[] numbers=new int[dim];
    ...
    GCHandle handle=GCHandle.Alloc(numbers, GCHandleType.Pinned);
    int sum=SumArray(handle.AddrOfPinnedObject(), dim);
    handle.Free();
    return sum;
}

[DllImport("nativeC.dll")]
public static extern int SumArray(IntPtr pNumbers, int count);

JollyMansArt wrote:

but I am not understanding an example where I can pass List between parrent and child forms...

private void SendEmail(string AlertType, string Subject, string MessageBody)
        {
            string[] MailTo;
            string[] MailCC;
            string MailFrom = "it@peerassistllc.com";
            List<string> EmailToAddress = EmailTo(AlertType);
            List<string> EmailCCAddress = EmailCC(AlertType);
            
            if (EmailToAddress.Count > 0)
            {
                MailTo = EmailToAddress.ToArray<string>();
                MailCC = EmailCCAddress.ToArray<string>();
            }
            else
            {
                MailTo = EmailCCAddress.ToArray<string>();
                EmailCCAddress.Clear();
                MailCC = EmailCCAddress.ToArray<string>();
            }
            //string Subject = txtAppName.Text + " " + txtVerNumber.Text + " (" + txtCompanyName.Text + ") ";
            //string MessageBody = Subject + "\r\n " + DateTime.Now.ToString();
            string smtpHOST = txtSMTPServer.Text;
            int smtpPORT = Convert.ToInt32(txtsmtpPortNumber.Text);
            string smtpNETAuthUser = txtsmtpServerAuthencationUserName.Text;
            string smtpNETAuthPassword = txtsmtpServerAuthencationPassword.Text;
            int i = 0;

            string LogMessage = "Mail From: " + MailFrom;
            if (MailTo.Length > 0)
            {
                LogMessage += "    Mail To: ";
                for (i = 0; i < MailTo.Length; i++)
                {
                    LogMessage += MailTo[i] + "; ";
                }
            }

            //MessageBox.Show(MailCC.Count<string>().ToString());
            //if (MailCC.Length > 0)
            if (MailCC.Count<string>() > 0)
            {
                LogMessage += "    Mail CC: ";
                for (i = 0; i < MailCC.Length; i++)
                {
                    LogMessage += MailCC[i] + "; ";
                }
            }
            LogMessage += "     SMTP Host Server: " + txtSMTPServer.Text;
            LogMessage += "     SMTP Server Port: " + txtsmtpPortNumber.Text;
            LogMessage += "     SMTP Server UserName Authencation: " + txtsmtpServerAuthencationUserName.Text;
            LogMessage += "     Message Subject: " + Subject;
            
            //send to sql server;
            StandardProcedures.SQL_Log(WhatIsMyConnectionString, AlertType, LogMessage, true);
            StandardProcedures.SQL_Log(WhatIsMyConnectionString, AlertType, MessageBody, true);
            if (MailTo.Count<string>() == 0 & MailCC.Count<string>() == 0)
            { return; }

            ConfirmEmailReceipents(ref MailTo, ref MailCC);  //This is what I am trying to get to work...

            StandardProcedures.NET_AuthenticatedMailSend(MailFrom, MailTo, MailCC, Subject, MessageBody, smtpHOST, smtpPORT, smtpNETAuthUser, smtpNETAuthPassword);
        }

private void ConfirmEmailReceipents(ref List<string> EmailTo, ref List<string> EmailCC)
        {


            using (frmpopupEmailRecipient popupVerifyEmailRecipients = new frmpopupEmailRecipient(ref EmailTo, ref EmailCC))
            {
                // passing this in ShowDialog will set the .Owner 
                // property of the child form
                //popupVerifyEmailRecipients
                popupVerifyEmailRecipients.ShowDialog(this);
            }
           using ( frmpopupEmailRecipient f2 = new frmpopupEmailRecipient())
            {
                if( f2.Show() == DialogResult.OK )
                {
                    f2.toEMAIL;
                    f2.ccEMAIL;

                    int i = f2.Number1;
                    string s = f2.String1;
                }
            }


        }

JollyMansArt wrote:

allow the form to add/delete items from the list variable for the (to,cc,bc) email addresses. Then finally pass the new list objects ...

using (frmpopupEmailRecipient popupVerifyEmailRecipients = new frmpopupEmailRecipient())
            {
                popupVerifyEmailRecipients.MyEmailTo = EmailTo;
                popupVerifyEmailRecipients.MyEmailCC = EmailCC;

                if (popupVerifyEmailRecipients.Show() == DialogResult.OK) //How to do this?
                {
                    
                }

                EmailTo = popupVerifyEmailRecipients.MyEmailTo;
                EmailCC = popupVerifyEmailRecipients.MyEmailCC;

            }

public partial class frmpopupEmailRecipient : Form
    {
        public List<String> MyEmailTo;
        public List<String> MyEmailCC
}

public void Show()
public DialogResult ShowDialog()

You create a formula field with below code and drag drop that field into ur crystal report detail section below ur data field, I hadnt checked may be it will work..<br />
<br />
<br />
Global booleanVar  flag:=true;<br />
Local stringVar  print ;<br />
if  flag  then print :="__________________________________";<br />
flag=false;<br />
if flag=false then<br />
flag:=true;<br />
print :=""