|
|
You're in the
dotnet interop
group:StringBuilder & Class Library exposed to COM
dotnet interop:
Maybe this problem has been discused many times here but I've spent several hours to find the answer with no luck. Basically, I have a c# class library exposed to COM. The client is written in unmanaged C++. One method of my c# class have a StringBuilder parameter. This parameter is exposed to COM as "/*[in,out]*/ LPWSTR". This is fine. Now when calling the library, I allocate a buffer then call the method. The problem is that the resulting StringBuilder as a capacity of 0. Any maniplation results in an ArgumentOutOfRangeException. I've tried to use [MarshalAs(UnmanagedType.LPWStr, SizeParamIndex = x)] to tell the size allocated, but this is not working. Any help appreciated.
Hi Olivier,
I think you may take a look at the KB below which describe a similar scenario with you. SYMPTOMS When you call a managed method that takes System.Text.StringBuilder as a parameter from an unmanaged client, you may receive an ArgumentOutOfRangeException exception error message. FIX: Call to managed class method with StringBuilder as in or out parameter may fail http://support.microsoft.com/kb/317577 You may have a try. If you still have any concern, please feel free to let me know. Best regards, Peter Huang Microsoft Online Community Support ================================================== Get notification to my posts through email? Please refer to http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif ications. Note: The MSDN Managed Newsgroup support offering is for non-urgent issues where an initial response from the community or a Microsoft Support Engineer within 1 business day is acceptable. Please note that each follow up response may take approximately 2 business days as the support professional working with you may need further investigation to reach the most efficient resolution. The offering is not appropriate for situations that require urgent, real-time or phone-based interactions or complex project analysis and dump analysis issues. Issues of this nature are best handled working with a dedicated Microsoft Support Engineer by contacting Microsoft Customer Support Services (CSS) at http://msdn.microsoft.com/subscriptions/support/default.aspx. ================================================== (This posting is provided "AS IS", with no warranties, and confers no rights.)
Hello Peter,
I'm using .NET 2.0 and this KB article is for 1.0 and 1.1. But I guess there is still a problem in .NET 2.0 ? May be a good think to do, is to remove StringBuilder in the Interop documentation. Thanks for that. [quoted text, click to view] ""Peter Huang" [MSFT]" <v-phuang@online.microsoft.com> wrote in message news:g21o3QM%23GHA.1984@TK2MSFTNGXA01.phx.gbl... > Hi Olivier, > > I think you may take a look at the KB below which describe a similar > scenario with you. > > SYMPTOMS > When you call a managed method that takes System.Text.StringBuilder as a > parameter from an unmanaged client, you may receive an > ArgumentOutOfRangeException exception error message. > > FIX: Call to managed class method with StringBuilder as in or out > parameter > may fail > http://support.microsoft.com/kb/317577 > > You may have a try. > If you still have any concern, please feel free to let me know. > > Best regards, > > Peter Huang > > Microsoft Online Community Support > ================================================== > Get notification to my posts through email? Please refer to > http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif > ications. > Note: The MSDN Managed Newsgroup support offering is for non-urgent issues > where an initial response from the community or a Microsoft Support > Engineer within 1 business day is acceptable. Please note that each follow > up response may take approximately 2 business days as the support > professional working with you may need further investigation to reach the > most efficient resolution. The offering is not appropriate for situations > that require urgent, real-time or phone-based interactions or complex > project analysis and dump analysis issues. Issues of this nature are best > handled working with a dedicated Microsoft Support Engineer by contacting > Microsoft Customer Support Services (CSS) at > http://msdn.microsoft.com/subscriptions/support/default.aspx. > ================================================== > (This posting is provided "AS IS", with no warranties, and confers no > rights.) >
To still use StringBuilder, the buffer allocated on the client should be
entirely filled with characters and the null terminating character in order to have a correct capacity. To clean the buffer before use in server code, just call Remove method : sb.Remove(0, sb.Capacity); Thanks for that. [quoted text, click to view] "Olivier Matrot" <olivier.matrot.rte@online.nospam> wrote in message news:eW94pdM%23GHA.1196@TK2MSFTNGP02.phx.gbl... > Hello Peter, > I'm using .NET 2.0 and this KB article is for 1.0 and 1.1. > > But I guess there is still a problem in .NET 2.0 ? > May be a good think to do, is to remove StringBuilder in the Interop > documentation. > Thanks for that. > > > ""Peter Huang" [MSFT]" <v-phuang@online.microsoft.com> wrote in message > news:g21o3QM%23GHA.1984@TK2MSFTNGXA01.phx.gbl... >> Hi Olivier, >> >> I think you may take a look at the KB below which describe a similar >> scenario with you. >> >> SYMPTOMS >> When you call a managed method that takes System.Text.StringBuilder as a >> parameter from an unmanaged client, you may receive an >> ArgumentOutOfRangeException exception error message. >> >> FIX: Call to managed class method with StringBuilder as in or out >> parameter >> may fail >> http://support.microsoft.com/kb/317577 >> >> You may have a try. >> If you still have any concern, please feel free to let me know. >> >> Best regards, >> >> Peter Huang >> >> Microsoft Online Community Support >> ================================================== >> Get notification to my posts through email? Please refer to >> http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif >> ications. >> Note: The MSDN Managed Newsgroup support offering is for non-urgent >> issues >> where an initial response from the community or a Microsoft Support >> Engineer within 1 business day is acceptable. Please note that each >> follow >> up response may take approximately 2 business days as the support >> professional working with you may need further investigation to reach the >> most efficient resolution. The offering is not appropriate for situations >> that require urgent, real-time or phone-based interactions or complex >> project analysis and dump analysis issues. Issues of this nature are best >> handled working with a dedicated Microsoft Support Engineer by contacting >> Microsoft Customer Support Services (CSS) at >> http://msdn.microsoft.com/subscriptions/support/default.aspx. >> ================================================== >> (This posting is provided "AS IS", with no warranties, and confers no >> rights.) >> > >
Hi Olivier,
Thanks for your quickly reply! Based on my research, this issue should be fixed in Whidbey i.e. .NET 2.0. Also I test the steps in the KB317577, Steps to reproduce the behavior But I can not reproduce the problem, I can see the dialog showed "changed changed". So far I think you may try to run the reproduce code in the KB to see what is thre result you get. If you still get the error, I think you may try to check in the class library to see what runtime you are running. e.g. public void Test(StringBuilder sbString) { Debug.WriteLine(System.Environment.Version.ToString()); string str = "changed changeddd"; sbString.Replace(sbString.ToString(), str); } If you did not get the error in the reproduce code but you keep get the error in your code. Can you build a simple reproduce sample, so that I can reproduce at my side and do further troubleshooting? If this is still a problem in .NET 2.0, I can report it our product team for you when I have reproduced the problem. You may reach me via removing "online" from my email address. If you still have any concern on this issue, please feel free to let me know. Best regards, Peter Huang Microsoft Online Community Support ================================================== When responding to posts, please "Reply to Group" via your newsreader so that others may learn and benefit from your issue. ================================================== This posting is provided "AS IS" with no warranties, and confers no rights.
Hi Peter,
I can confirm that the issue is fixed in .NET 2.0. The problem was that in my original C++ code, the buffer is allocated and filled with the null terminating character. In other words, I'm sending an empty string. I Though that the Interop Framework will be able to determine the "real" size of the buffer and allocate a string builder with the correct capacity. This is not the case. In fact, the framework allocate a stringbuilder with a capacity based on the string length sent by the client. This is why I'm filling the buffer with spaces that are removed on the server side. Best regards. [quoted text, click to view] ""Peter Huang" [MSFT]" <v-phuang@online.microsoft.com> wrote in message news:P2EpNfa%23GHA.4432@TK2MSFTNGXA01.phx.gbl... > Hi Olivier, > > Thanks for your quickly reply! > > Based on my research, this issue should be fixed in Whidbey i.e. .NET 2.0. > Also I test the steps in the KB317577, > Steps to reproduce the behavior > > But I can not reproduce the problem, I can see the dialog showed "changed > changed". > > So far I think you may try to run the reproduce code in the KB to see what > is thre result you get. > If you still get the error, I think you may try to check in the class > library to see what runtime you are running. > e.g. > public void Test(StringBuilder sbString) > { > Debug.WriteLine(System.Environment.Version.ToString()); > string str = "changed changeddd"; > sbString.Replace(sbString.ToString(), str); > } > > If you did not get the error in the reproduce code but you keep get the > error in your code. > Can you build a simple reproduce sample, so that I can reproduce at my > side > and do further troubleshooting? > If this is still a problem in .NET 2.0, I can report it our product team > for you when I have reproduced the problem. > > You may reach me via removing "online" from my email address. > > If you still have any concern on this issue, please feel free to let me > know. > > > Best regards, > > Peter Huang > > Microsoft Online Community Support > ================================================== > When responding to posts, please "Reply to Group" via your newsreader so > that others may learn and benefit from your issue. > ================================================== > This posting is provided "AS IS" with no warranties, and confers no > rights. >
Hi Olivier,
Thanks I understand you write your C++ code similar as below, the string is Null Terminated leading string. So that the wcslen will be Zero. try { ITestPtr spTest; //wchar_t wszTestString[] = L"This is a test."; //<- This works wchar_t wszTestString[] = L"\0A long long string for test."; long length = 1024;//(wcslen(wszTestString) + 1) * sizeof(WCHAR); LPWSTR lpszTestString = (LPWSTR)::CoTaskMemAlloc(length); spTest.CreateInstance(CLSID_Class1); wcscpy((LPWSTR)lpszTestString, wszTestString); spTest->Test((LPWSTR)lpszTestString); MessageBoxW(NULL, (LPWSTR)lpszTestString, L"Results", 0); ::CoTaskMemFree((LPWSTR)lpszTestString); } Now even if the actually wszTestString array is greater than 0, the .NET interop layer will still consider the pass parameters as 0. I think this is by design. Because we are handling string here, so the \0 should mean a terminatal of a string char array, so it make sense that .NET framework consider the wszTestString is of 0 size. Or it is hard to .NET interop to decided which should be the terminal of a pass parameter which is a string. As you pointed out, the workaround is to fill space or other non-\0 in the string. Also if you are not handling string here, just want to represent a buffer here, so why not handle it as a byte array and pass the byte array as parameter. If you still have any concern, please fee l free to let me know. Best regards, Peter Huang Microsoft Online Community Support ================================================== When responding to posts, please "Reply to Group" via your newsreader so that others may learn and benefit from your issue. ================================================== This posting is provided "AS IS" with no warranties, and confers no rights.
Don't see what you're looking for? Try a search.
|
June 2003
July 2003
August 2003
September 2003
October 2003
November 2003
December 2003
January 2004
February 2004
March 2004
April 2004
May 2004
June 2004
July 2004
August 2004
September 2004
October 2004
November 2004
December 2004
January 2005
February 2005
March 2005
April 2005
May 2005
June 2005
July 2005
August 2005
September 2005
October 2005
November 2005
December 2005
January 2006
February 2006
March 2006
April 2006
May 2006
June 2006
July 2006
August 2006
September 2006
October 2006
November 2006
December 2006
January 2007
February 2007
March 2007
April 2007
May 2007
June 2007
July 2007
August 2007
September 2007
October 2007
November 2007
December 2007
January 2008
February 2008
March 2008
April 2008
May 2008
June 2008
| home · blog · groups | Questions? Comments? Contact the dn |