Thanks Viv;
The steps you listed, is what I need the help with.

Cyrus

>Hi,
>Most of the C# code is just for creating, reading and writing to files. Should be simple in VFP:
>
>Encrypting:
>1. Create a file with the *.req extension in the required folder.
>2. Create an instance of the EncryptionManager.
>3. Call its EncryptThirdPartyMessage() method passing in the name of the created file (including the full path) and the string to encrypt
>4. Write the return value to the file.
>5. Copy the file to the output location.
>
>Decrypting (looks as if the input file can contain multiple strings?):
>1. Create a file to hold the output.
>2. Open the input file
>3. For each line in the input file
> (a) Call DecryptThirdPartyMessage() passing in the fullname of the input file and the line string
> (b) Write the returned string to the output file.....
>
>AFAICS the only reason for passing the filenames to the EncryptionManager methods is that it uses the
>file timestamp for something ?
>All the file stuff can probably be done with STRTOFILE() and FILETOSTR()
>
>
>
>
>>Thanks Michael; Here it is:
>>________________________________________________________________________________________________
>>TO ENCRYPT THE STRING:
>>
>>(Sample code is written in C#.Net)
>>
>>// File name format that ICVERIFY understand for request processing
>>string csFileName = "\\icver001.req";
>>// Shared directory path where file is being created.
>>string txtSharedDirPath = "C:\\Shared Directory";
>>string csSharedDirPath = txtSharedDirPath + csFileName;
>>/*
>>// Request directory path where file will be used by
>>// ICVERIFY for transaction processing.
>>*/
>>string txtReqPath = "C:\\Request Directory";
>>string csReqPreparationPath = txtReqPath + csFileName;
>>// Object of StreamWriter
>>StreamWriter objWriter = null;
>>// This code is creating an empty file in shared directory path
>>FileStream objFileStream = new FileStream(csSharedDirPath, FileMode.Create, FileAccess.Write);
>>objWriter = new StreamWriter(objFileStream);
>>/*
>>// To call EncryptionManager.dll to encrypt string
>>// EncryptionManager.dll will use the creation date of the
>>// file that was being created in shared directory path.
>>*/
>>string csStringToEncrypt = "Some string";
>>EncryptionManager objEncryptionManager = new EncryptionManager();
>>string csEncryptedString = objEncryptionManager.EncryptThirdPartyMessage(csSharedDirPath, csStringToEncrypt);
>>// To write the encrypted string in the file
>>objWriter.WriteLine(csEncryptedString);
>>if (objWriter != null)
>> objWriter.Close();
>>/*
>>// Once all the encrypt strings have been written in file,
>>// move that file into the request directory for processing.
>>*/
>>File.Move(csSharedDirPath, csReqPreparationPath);
>>________________________________________________________________________________________________
>>
>>TO DECRYPT THE STRING:
>>
>>(Sample code is written in C#.Net)
>>// File name that need to be decrypted
>>string csFileName = "\\icver001.ans";
>>// Shared directory path where decrypted file will be created.
>>string txtSharedDirPath = "C:\\Shared Directory";
>>string csSharedDirPath = txtSharedDirPath + csFileName;
>> /*
>>// Request directory path where file that needs to be
>>// decrypted is present.
>>*/
>>string txtReqPath = "C:\\Request Directory";
>>string csReqPreparationPath = txtReqPath+ csFileName;
>>// object of StreamWriter
>>StreamWriter objWriter = null;
>>// This code is creating an empty file in shared directory path
>>FileStream objFileWriteStream = new FileStream(csSharedDirPath, FileMode.Create, FileAccess.Write);
>>objWriter = new StreamWriter(objFileWriteStream);
>>StreamReader objReader = null;
>>FileStream objFileReadStream = new FileStream(csReqPreparationPath, FileMode.Open, FileAccess.Read);
>>objReader = new StreamReader(objFileReadStream);
>>/*
>>// To call EncryptionManager.dll to decrypt string
>>// EncryptionManager.dll will use the creation date of the
>>// file that was being created in Request directory path.
>> */
>>EncryptionManager objEncryptionManager = new EncryptionManager();
>>string strDecString = "";
>>string strEncString = "";
>>while (((strEncString = objReader.ReadLine()) != null))
>>{
>>strDecString = objEncryptionManager.DecryptThirdPartyMessage(csReqPreparationPath, strEncString);
>>objWriter.WriteLine(strDecString);
>>}
>>if (objReader != null)
>>objReader.Close();
>>if (objWriter != null)
>>objWriter.Close();
>>________________________________________________________________________________________________
>>
>>And they had me run the following to register the DLLs in Windows Command Prompt:
>>C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\IcvGacUtil /i C:\ICVERIFY\ICWin403\SecurityService.dll
>>C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\RegAsm C:\ICVERIFY\ICWin403\SecurityService.dll /tlb
>>C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\IcvGacUtil /i C:\ICVERIFY\ICWin403\EncryptionManager.dll
>>C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\RegAsm C:\ICVERIFY\ICWin403\EncryptionManager.dll /tlb
>>________________________________________________________________________________________________
>>
>>Pease let me know the cost, so you can just put it on my card.
>>Thanks
>>Cyrus
>>
>>
>>>>I am trying to use an External DLL (supplied by a Payment Transaction company ICVerify) to
>>>>
>>>>a) convert a String Variable into an encrypted file, and then
>>>>b) Decrypt the File into a String variable.
>>>>
>>>>They don't have a VFP sample code, but they have supplied Sample Code in C#.
>>>>It is about 5 to 10 commands. I need to have the C# code translated into VFP code and then some help in getting it to run.
>>>>
>>>>Please let me know asap.
>>>
>>>Could you simply paste the code in here?