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We appreciate your feedback. Notice the use of the FAILED() macro. This is important for you C++ programmers out there, so I hope you're still reading! at FAXCOMEXLib.FaxDocumentClass.ConnectedSubmit(FaxServer pFaxServer) at ASP.faxbooking_aspx.__Renderform1(HtmlTextWriter __w, Control parameterContainer) in C:\inetpub\wwwroot\FaxBooking\FaxBooking.aspx:line 35 The issue seems to be related to either the DLL or IIS, or a permissions problem.

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To fix this, you can use #pragma unmanaged to keep code that relies on GetLastError functionality as unmanaged code. Sign up now! But I am just putting this out here, especially for some of you who aren't in the mood to write big switch/case or if/else blocks every time Will the following code give Winsock error message()? _com_error( HRESULT_FROM_WIN32(WSAGetLastError() ).ErrorMessage() Thanks in Advance.

Instead, I would be delighted if readers could please use this article's message board, below, to share their thoughts - and tips - for navigating through the waters of Win32 and Member Login Remember Me Forgot your password? If you want to access this error code, you must call GetLastWin32Error instead of writing your own platform invoke definition for GetLastError and calling it. Pass GetLastError as a parameter to CallComErrMsgBox().

How that failure is indicated depends on the API. Is there a way to look these up within the program? Contact us today More About Contact News Partners Privacy Policy Terms of Service New Service: ShieldQ Quick API Links Java Fax C# Fax Fax ASP VB Fax PHP Fax Python Fax Finally, don't forget about the rules of GetLastError, which are not specific to managed code but still apply: 1) Not all Win32 APIs make use of this mechanism.

Step 2: Add _com_error calls to your application In the SimpleErrors sample application, I have added two buttons: one button that makes a bogus Win32 CreateFile() call; and another button to Introduction In your previous project, you may have called Win32 or COM functions. Here are the ones I generated, shown in Listing 5:// {9346460E-F860-450c-B8C6-80D705644FF0} static const GUID CLSID_IAmDumb = { 0x9346460e, 0xf860, 0x450c, { 0xb8, 0xc6, 0x80, 0xd7, 0x5, 0x64, 0x4f, 0xf0 } }; Using FAXCOMEXLib to Build Automated Fax Application on XP Causes Operation Failed Error (.NET) Problem You are attempting to build an automated client to send faxes on XP Professional.

You could definitely do the same thing in managed code with a PInvoke call to FormatMessage, but the .NET Framework provides a much simpler way to do this. kimjim20-Mar-06 17:11 kimjim20-Mar-06 17:111 Excellent article. Sign Up Now! Discussion in 'Microsoft C# .NET' started by Will Pittenger, Aug 15, 2003.

Appease Your Google Overlords: Draw the "G" Logo Why is water evaporated from the ocean not salty? See this answer for how it would normally be called from native code. Workaround Write an application in Visual C++, run it on the client machine, and send faxes using this client’s user details. The line beginning with a call to AfxMessageBox() displays the following message box - shown below in Figure 2 - when the Call Win32 Function And Get Error button, in Figure

Hang on. For a similar scenario and solution in C#, see the following section. And it's true that there may be application types for which this approach is unsuitable. By definition every negative HRESULT is an error.

Notice how the error handling is done all in one line. So unlike some other posters I won't be changing all my code to use a one liner approach but will continue using support classes and other code to provide more meaningful In this case, try to restore the TIFF file association to Windows Picture & Fax Viewer under: Windows Explorer > Folder Options > File Types. Ferne Li8-May-06 15:32 Ferne Li8-May-06 15:321 That is great!

Happy Error Handling (and Happy New Year 2006 - I am writing this on New Year's eve, 2005!)! To get the actual error message, turn the code of the error (the last part, 0x483) into a decimal – 1155. The _com_error class The details of compiler COM support and the classes it provides are beyond the scope of this article. To retrieve hresult from com exception use: uint HResult = (uint)Marshal.GetHRForException(ex); Reply Richard says: July 28, 2005 at 11:13 am Actually, you can simplify the call to: string errorMessage = new

An additional issue that came up in this scenario is that the Windows service is running on a user account that doesn’t exist, which throws an error like the following: The As an example, Listing 1 shows the one single line of code to throw up a message box based on a Windows Win32 SDK system error, as returned by GetLastError():AfxMessageBox(_com_error(GetLastError()).ErrorMessage(),MB_ICONSTOP); Listing EDIT: Thanks Malfist for pointing me to pinvoke.net, which includes alternative, managed API: using System.ComponentModel; string errorMessage = new Win32Exception(Marshal.GetLastWin32Error()).Message; Console.WriteLine(errorMessage); share|improve this answer edited Dec 16 '15 at 5:08 Mark My first step, to prepare for calling CoCreateInstance(), is to use the Create GUID tool which comes with Visual C++ to create two GUIDs, one for the CLSID and one for

I figured I would quickly post a snippet that you can use in C# to get an actual textual error back instead of just the Windows error code that is returned The ones we pass to CoCreateInstance() here are the so-called CLSIDs and IIDs. Just a quick note as well: These error messages are not always useful. Console.WriteLine("Calling Win32 MessageBox with error..."); Win32.MessageBox(new IntPtr(123132), "Press OK...", "Press OK Dialog", 0); // Get the last error and display it.

Trying to Send Automated Faxes from ASP Web Page Causes Operation Failed Error (.NET) Problem You are working with XP Pro on a development machine, and have installed the fax service Happy new year to you, too! The best place to put these GUID declarations is in the same source file that I am going to call CoCreateInstance() in. NerdyHearn - Latest tech news relating to C#, ASP.NET, SharePoint, PHP, general development, and more.

This should solve the problem. Can I tell the user The system has attempted to load or restore a file into the registry, but the specified file is not in a registry file format. (ERROR_NOT_REGISTRY_FILE: 0x3F9) My approach above was simply to call CreateFile() to open the non-existing file testing.TXT. It's quick & easy.

If you're using VB.Net, Err.LastDllError is also an acceptable way of accessing the last error code. Content is Supplied Courtesy of InterFAX, the Leading Fax API This content was collected for you courtesy of InterFAX, an online fax service providing a powerful fax API. Stay logged in Welcome to PC Review! Marshal.GetLastWin32Error Method () .NET Framework (current version) Other Versions Visual Studio 2010 .NET Framework 4 Silverlight Visual Studio 2008 .NET Framework 3.5 .NET Framework 3.0 .NET Framework 2.0 .NET Framework 1.1