Hi Timothy,
Has your problem been resolved?
If it still does not work, please feel free to let me know.
Best regards,
Jeffrey Tan
Microsoft Online Partner Support
Get Secure! -
www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.
--------------------
| From: "Timothy Shih" <
[email protected]>
| References: <
[email protected]>
<
[email protected]>
<
[email protected]>
<
[email protected]>
| Subject: Re: Need help with importing unmanaged code
| Date: Fri, 17 Oct 2003 14:34:14 -0400
| Lines: 314
| X-Priority: 3
| X-MSMail-Priority: Normal
| X-Newsreader: Microsoft Outlook Express 6.00.2800.1158
| X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
| Message-ID: <
[email protected]>
| Newsgroups: microsoft.public.dotnet.languages.csharp
| NNTP-Posting-Host: dsl092-093-226.bos1.dsl.speakeasy.net 66.92.93.226
| Path: cpmsftngxa06.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP09.phx.gbl
| Xref: cpmsftngxa06.phx.gbl microsoft.public.dotnet.languages.csharp:192165
| X-Tomcat-NG: microsoft.public.dotnet.languages.csharp
|
| Yep, that was the problem! Thanks a lot for your help. Also, I am still
| unable to compile with printf, sprintf or fprintf, even though I have
| #included stdio.h. Do you have any idea why I can't use these functions?
|
| Thanks again!
| Tim
|
|
| | >
| > Hi Timothy,
| >
| > You can also alloc your memory from managed memory, but you should
marshal
| > it correctly.
| > Sample code like this:
| > [DllImport("dlltest.dll",CharSet=CharSet.Ansi)]
| > static extern void
| > ReturnCharPointer([In,Out,MarshalAs(UnmanagedType.LPArray,
| > SizeParamIndex=1)] byte []bytebuf,int
| > buffersize,[In,Out,MarshalAs(UnmanagedType.LPArray, SizeParamIndex=3)]
| char
| > []charbuf,int charbufsize);
| >
| > int a = 100;
| > int b = 75;
| > byte[] bytebuf = new byte[a];
| > char[] charbuf = new char
;
| > for(int i =0; i <a; i++)
| > {
| > bytebuf= Convert.ToByte(i);
| > }
| >
| > ReturnCharPointer( bytebuf,a, charbuf,b);
| > for(int k=0; k< b;k++)
| > {
| > Console.Write(Convert.ToInt32(charbuf[k]) + ", ");
| > }
| >
| > It works well on my machine, if you still have any question, please feel
| > free to let me know.
| >
| > Btw: I think the strange display of your code is because in C# a char is
| > 2-bytes, while in C/C++ a char is 1-byte long. You¡¯ve got an
| ASCII/UNICODE
| > mismatch when you are passing in the char* from C#.
| >
| > Hope all these help
| >
| > Best regards,
| > Jeffrey Tan
| > Microsoft Online Partner Support
| > Get Secure! - www.microsoft.com/security
| > This posting is provided "as is" with no warranties and confers no
rights.
| >
| > --------------------
| > | X-Tomcat-ID: 243569578
| > | References: <[email protected]>
| > <[email protected]>
| > | MIME-Version: 1.0
| > | Content-Type: text/plain
| > | Content-Transfer-Encoding: 7bit
| > | From: (e-mail address removed) ("Jeffrey Tan[MSFT]")
| > | Organization: Microsoft
| > | Date: Tue, 14 Oct 2003 09:58:58 GMT
| > | Subject: RE: Need help with importing unmanaged code
| > | X-Tomcat-NG: microsoft.public.dotnet.languages.csharp
| > | Message-ID: <[email protected]>
| > | Newsgroups: microsoft.public.dotnet.languages.csharp
| > | Lines: 169
| > | Path: cpmsftngxa06.phx.gbl
| > | Xref: cpmsftngxa06.phx.gbl
| microsoft.public.dotnet.languages.csharp:191157
| > | NNTP-Posting-Host: TOMCATIMPORT1 10.201.218.122
| > |
| > |
| > | HI Timothy,
| > |
| > | On my machine, when I consume the dll, the printf works well and no
| error
| > | generates.
| > | Btw: In your second printf, you should use %d to show your data, if
you
| > use
| > | %c, it will display it as Ascii.
| > |
| > | Best regards,
| > | Jeffrey Tan
| > | Microsoft Online Partner Support
| > | Get Secure! - www.microsoft.com/security
| > | This posting is provided "as is" with no warranties and confers no
| rights.
| > |
| > | --------------------
| > | | X-Tomcat-ID: 235590570
| > | | References: <[email protected]>
| > | | MIME-Version: 1.0
| > | | Content-Type: text/plain
| > | | Content-Transfer-Encoding: 7bit
| > | | From: (e-mail address removed) ("Jeffrey Tan[MSFT]")
| > | | Organization: Microsoft
| > | | Date: Tue, 14 Oct 2003 09:37:27 GMT
| > | | Subject: RE: Need help with importing unmanaged code
| > | | X-Tomcat-NG: microsoft.public.dotnet.languages.csharp
| > | | Message-ID: <[email protected]>
| > | | Newsgroups: microsoft.public.dotnet.languages.csharp
| > | | Lines: 132
| > | | Path: cpmsftngxa06.phx.gbl
| > | | Xref: cpmsftngxa06.phx.gbl
| > microsoft.public.dotnet.languages.csharp:191149
| > | | NNTP-Posting-Host: TOMCATIMPORT1 10.201.218.122
| > | |
| > | |
| > | | Hi Timothy,
| > | |
| > | | Normally, there are 2 ways of interop with unmanaged dll, safe way
and
| > | | unsafe way.
| > | | While the unsafe way is not recommanded, because its memory
operations
| > | are
| > | | all not safe.
| > | | Here is the safe way of consuming the unmanaged dll:
| > | |
| > | | [DllImport("dlltest.dll",CharSet=CharSet.Ansi)]
| > | | static extern void ReturnCharPointer( byte []bytebuf , int
buffersize,
| >
| > | | IntPtr charbuf, int charbufsize);
| > | |
| > | | int a = 100;
| > | | int b = 75;
| > | | byte[] bytebuf = new byte[a];
| > | | IntPtr charbuf = Marshal.AllocHGlobal(b);
| > | |
| > | | for(int i =0; i <a; i++)
| > | | {
| > | | bytebuf= Convert.ToByte(i);
| > | | }
| > | | ReturnCharPointer(bytebuf,a,charbuf,b);
| > | |
| > | | for(int k=0;k<b;k++)
| > | | {
| > | | Console.WriteLine(Marshal.ReadByte(charbuf,k));
| > | | }
| > | |
| > | | In the last for loop, I use Marshal.Read* function to retrieve data
| > from
| > | | unmanaged memory. You can also create a char array in managed memory
| > and
| > | | use Marshal.Copy method to copy the unmanaged memory to managed
| memory,
| > | | then it will be comfortable to use.
| > | |
| > | | If you still want to use unsafe way to interop the unmanaged dll,
you
| > | | should alloc the memory from unmanaged memory, but your code alloc
| from
| > | the
| > | | managed memory.
| > | | You can do like this:
| > | | [DllImport("dlltest.dll",CharSet=CharSet.Ansi)]
| > | | unsafe static extern void ReturnCharPointer( byte *bytebuf , int
| > | | buffersize, char * charbuf, int charbufsize);
| > | |
| > | | int a = 100;
| > | | int b = 75;
| > | |
| > | | byte* bytebuf=(byte*)Marshal.AllocCoTaskMem(a);
| > | | char* charbuf=(char*)Marshal.AllocCoTaskMem(b);
| > | |
| > | | for(int i =0; i <a; i++)
| > | | {
| > | | bytebuf= Convert.ToByte(i);
| > | | }
| > | |
| > | | ReturnCharPointer( bytebuf,a, charbuf,b);
| > | |
| > | | After ReturnCharPointer method, in the memory window, you can see
that
| > | the
| > | | charbuf is what you want, but if you want to show it out, you should
| > | | interop with some umanaged function such as printf, MessageBoxA to
| show
| > | it
| > | | out.
| > | |
| > | | Hope this helps,
| > | |
| > | | Best regards,
| > | | Jeffrey Tan
| > | | Microsoft Online Partner Support
| > | | Get Secure! - www.microsoft.com/security
| > | | This posting is provided "as is" with no warranties and confers no
| > rights.
| > | |
| > | | --------------------
| > | | | From: "Timothy Shih" <[email protected]>
| > | | | Subject: Need help with importing unmanaged code
| > | | | Date: Mon, 13 Oct 2003 11:08:15 -0400
| > | | | Lines: 78
| > | | | X-Priority: 3
| > | | | X-MSMail-Priority: Normal
| > | | | X-Newsreader: Microsoft Outlook Express 6.00.2800.1158
| > | | | X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
| > | | | Message-ID: <[email protected]>
| > | | | Newsgroups: microsoft.public.dotnet.languages.csharp
| > | | | NNTP-Posting-Host: dsl092-093-226.bos1.dsl.speakeasy.net
| 66.92.93.226
| > | | | Path:
cpmsftngxa06.phx.gbl!TK2MSFTNGP08.phx.gbl!tk2msftngp13.phx.gbl
| > | | | Xref: cpmsftngxa06.phx.gbl
| > | microsoft.public.dotnet.languages.csharp:190996
| > | | | X-Tomcat-NG: microsoft.public.dotnet.languages.csharp
| > | | |
| > | | | Hi, I am trying to figure out how to use unmanaged code using
| > P/Invoke.
| > | I
| > | | | wrote a simple function which takes in 2 buffers (one a byte
buffer,
| > | one a
| > | | | char buffer) and copies the contents of the byte buffer into the
| > | character
| > | | | pointer. The code looks like the following:
| > | | |
| > | | | #include <stdio.h>
| > | | | #include <stdlib.h>
| > | | | #include "stdafx.h"
| > | | | BOOL APIENTRY DllMain( HANDLE hModule,
| > | | | DWORD ul_reason_for_call,
| > | | | LPVOID lpReserved
| > | | | )
| > | | | {
| > | | | return TRUE;
| > | | | }
| > | | |
| > | | | extern "C" __declspec(dllexport)
| > | | | void ReturnCharPointer(UINT8 *buffer, int buffersize, char
*charbuf,
| > int
| > | | | charbufsize) {
| > | | | int i =0;
| > | | | for(i=0; i < charbufsize; i++) {
| > | | | if(i>=buffersize)
| > | | | return;
| > | | | //printf("BYTE %d: %d\r\n",i,buffer);
| > | | | charbuf = buffer;
| > | | | //printf("CHAR %d: %c\r\n",i,charbuf);
| > | | | }
| > | | | }
| > | | |
| > | | | Now I try to import that function with the following line in a C#
| > | project:
| > | | |
| > | | | [DllImport("DllShell")]
| > | | | unsafe static extern void ReturnCharPointer(byte *buffer, int
| > | buffersize,
| > | | | char *charbuf, int charbufsize);
| > | | |
| > | | | I use this in the following function:
| > | | |
| > | | | unsafe private void ParseBuffer()
| > | | | {
| > | | | int a = 100;
| > | | | int b = 75;
| > | | | byte[] bytebuf = new byte[a];
| > | | | char[] charbuf = new char;
| > | | | for(int i =0; i <a; i++)
| > | | | {
| > | | | bytebuf= Convert.ToByte(i);
| > | | | }
| > | | | fixed(byte *bbuf=bytebuf)
| > | | | fixed(char *cbuf = charbuf)
| > | | | ReturnCharPointer(bbuf,a,cbuf,b);
| > | | | for(int i =0; i < b; i++)
| > | | | {
| > | | | Console.Write(charbuf + ", ");
| > | | | }
| > | | |
| > | | | }
| > | | |
| > | | | My problem is the following: I can import and run the code just
| fine.
| > | | | However, when the function exits, the data in the character buffer
| is
| > | not
| > | | | what is expected! The byte buffer contains the numbers 0-99, the
| > | character
| > | | | buffer, whose size is 75 contains the following : [0] = 256, [1] =
| > 770,
| > | | [2]
| > | | | = 1284, [3] = 1798.... etc. The rest of the array is incremented
at
| > the
| > | | same
| > | | | rate until index 37 which contains the value "74". Since 74 should
| be
| > | the
| > | | | last entry in the buffer, i suspect that the data is somehow being
| > | | squashed
| > | | | on the way into or out of the unmanaged C dll. Also I was unable
to
| > use
| > | | | printf in the dll as it threw the following compiler error:
| > | | | "error C3861: 'printf': identifier not found, even with
| > | argument-dependent
| > | | | lookup"
| > | | |
| > | | | If anyone has any clue as to what is going on, it would be greatly
| > | | | appreciated!!
| > | | |
| > | | | Thanks,
| > | | | Tim
| > | | |
| > | | |
| > | | |
| > | | |
| > | | |
| > | |
| > | |
| > |
| > |
| >
|
|
|
