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interop between VB.NET and eVC++ Messages   Related Types This message was discovered on microsoft.public.dotnet.languages.vb. Responses highlighted in red are from those people who are likely to be able to contribute good, authoratitive information to this discussion. They include Microsoft employees, MVP's and others who IMHO contribute well to these kinds of discussions. Post a new message to this list... Eric BOUXIROT hi there, i'm working on a smart application project on VB.NET. i must call API (custom eVC++ DLL) but i have some trouble with mashalas attribute..... i have copy/past a sample on msdn help but it's not working.. IDE says "unknown 'mashalAs' attribute".....and i don't know why.... i have try exactly the same code on a normal windows project and it work (compile) fine... i don't know what i've missed.... here some lines of my code... thank a lot... Imports System.Runtime.InteropServices Public Class Form1 Public Declare Function F_BDO_MessageBoxOK Lib "PDA_BDO.dll" (ByRef IN_title() As Byte, <MarshalAs(UnmanagedType.LPStr)> ByRef IN_msg As String) As Int32 Reply to this message...        Alex Feinman [MVP] (VIP) MarshalAs attribute is not supported in CF - simply drop it, and your string will be passed as LPCWSTR (note the constant part) As for a byte array, replace ByRef with ByVal - the array will be passed down as LPBYTE -- Alex Feinman --- Visit http://www.opennetcf.org "Eric BOUXIROT" <Click here to reveal e-mail address> wrote in message news:4145bf49$0$1291$Click here to reveal e-mail address... [Original message clipped] Reply to this message...        Eric BOUXIROT oh ok..... thank, but i have one more question... in my eVC++ DLL some functions use non-unicode strings (unsigned char*) how i can tell VB to call DLL with non-UNICODE string format ? thank a lot ! "Alex Feinman [MVP]" <Click here to reveal e-mail address> a écrit dans le message de news: Click here to reveal e-mail address... [Original message clipped] Reply to this message...        Chris Tacke, eMVP (VIP) Pass a byte array. -Chris "Eric BOUXIROT" <Click here to reveal e-mail address> wrote in message news:4145c675$0$1302$Click here to reveal e-mail address... [Original message clipped] Reply to this message...        Eric BOUXIROT yes i have already test this....it's ok but in my VB code i can't directly convert String to byte array.. like this.. DLLFunction ("Toto".tobytearray) i must declare one byte array then fill it with the string chars....then call my function... Dim bytearray(50) as byte convertstring2bytearray ("toto",bytearray) DLLFunction(bytearray) i prefer the first method....but how i can implement the toByteArray method to the string class ? thank a lot . "Chris Tacke, eMVP" <Click here to reveal e-mail address> a écrit dans le message de news: Click here to reveal e-mail address... [Original message clipped] Reply to this message...        Chris Tacke, eMVP (VIP) Use the Encoding class to change it. -Chris "Eric BOUXIROT" <Click here to reveal e-mail address> wrote in message news:4145ccab$0$1285$Click here to reveal e-mail address... [Original message clipped] Reply to this message...        Eric BOUXIROT an small example ? thank a lot ! "Chris Tacke, eMVP" <Click here to reveal e-mail address> a écrit dans le message de news: Click here to reveal e-mail address... [Original message clipped] Reply to this message...        Alex Feinman [MVP] (VIP) Dim chars as Byte() = System.Text.Encoding.ASCII.GetBytes(myString) THis is what you need to pass down to the unmanaged code -- Alex Feinman --- Visit http://www.opennetcf.org "Eric BOUXIROT" <Click here to reveal e-mail address> wrote in message news:4145cef0$0$1300$Click here to reveal e-mail address... [Original message clipped] Reply to this message...        Eric BOUXIROT ok thank a lot for your very quick answers... it work fine.... "Alex Feinman [MVP]" <Click here to reveal e-mail address> a écrit dans le message de news: Click here to reveal e-mail address... [Original message clipped] Reply to this message...        Chris Tacke, eMVP (VIP) Take a look at the sample in MSDN: http://msdn.microsoft.com/library/en-us/cpref/html/frlrfSystemTextEncodingClassConvertTopic.asp -Chris "Eric BOUXIROT" <Click here to reveal e-mail address> wrote in message news:4145cef0$0$1300$Click here to reveal e-mail address... [Original message clipped] Reply to this message...        Peter Foot [MVP] (VIP) asciibytes = System.Text.Encoding.ASCII.GetBytes("Hello World") Peter -- Peter Foot Windows Embedded MVP www.inthehand.com | www.opennetcf.org Do have an opinion on the effectiveness of Microsoft Windows Mobile and Embedded newsgroups? Let us know! https://www.windowsembeddedeval.com/community/newsgroups "Eric BOUXIROT" <Click here to reveal e-mail address> wrote in message news:4145cef0$0$1300$Click here to reveal e-mail address... [Original message clipped] Reply to this message...     System.Runtime.InteropServices.UnmanagedType System.Text.Encoding Ad MBR BootFX Best-of-breed application framework for .NET projects, developed by Matthew Baxter-Reynolds and MBR IT

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