SP_DEVINFO_LIST_DETAIL_DATA cbSize
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From: santapanda on 15 Apr 2010 10:25 Hello again, My problem with SP_DEVINFO_DATA cbSize was resolved. But then I attempted to apply the same logic to a SP_DEVINFO_LIST_DETAIL_DATA structure and I'm getting the same "The supplied user buffer is not valid for the requested operation." after using the object in a SetupDixx method. That error is generated when I tried the following struct definitions and setting for cbSize: ***** [StructLayout(LayoutKind.Sequential)] public struct SP_DEVINFO_LIST_DETAIL_DATA { public UInt32 cbSize; public System.Guid classGuid; public IntPtr remoteMachineHandle; public string RemoteMachineName; } SP_DEVINFO_LIST_DETAIL_DATA dList = new SP_DEVINFO_LIST_DETAIL_DATA(); dList.cbSize = (UInt32) Marshal.SizeOf(dList); *********** Per a suggestion from another forum poster, I tried this struct definition: *************** public const int MAX_PATH = 260; public const int SP_MAX_MACHINENAME_LENGTH = (MAX_PATH + 3); [StructLayout(LayoutKind.Sequential)] public struct SP_DEVINFO_LIST_DETAIL_DATA { [MarshalAs(UnmanagedType.U4)] public UInt32 cbSize; [MarshalAs(UnmanagedType.Struct)] public System.Guid classGuid; [MarshalAs(UnmanagedType.SysInt)] public IntPtr remoteMachineHandle; [MarshalAs(UnmanagedType.ByValArray, SizeConst = SP_MAX_MACHINENAME_LENGTH] public char[] RemoteMachineName; } ***************** This still produced the same error. However, since I'm developing on a 64-bit machine, I changed "UnmanagedType.U4" to "UnmanagedType.U8", and got a different error: "Type SP_DEVINFO_LIST_DETAIL_DATA cannot be marshaled as an unmanaged structure; no meaningful size or offset can be computed." I can't seem to find others using this structure in P/Invoke examples. Does anyone have any other ideas? Thanks!
From: Doron Holan [MSFT] on 15 Apr 2010 13:49 are you just blindly trying to brute force this? this is the native definition typedef struct _SP_DEVINFO_LIST_DETAIL_DATA_W { DWORD cbSize; GUID ClassGuid; HANDLE RemoteMachineHandle; WCHAR RemoteMachineName[SP_MAX_MACHINENAME_LENGTH]; } SP_DEVINFO_LIST_DETAIL_DATA_W, *PSP_DEVINFO_LIST_DETAIL_DATA_W; the marshaller has no idea that string RemoteMachineName must be 1) inline in the marshalled structure vs a pinned pointer 2) as an inlined field, a fixed size d -- This posting is provided "AS IS" with no warranties, and confers no rights. "santapanda" <santapanda(a)discussions.microsoft.com> wrote in message news:EC03E8C2-A952-4108-BC66-A457927C3083(a)microsoft.com... > Hello again, > > My problem with SP_DEVINFO_DATA cbSize was resolved. But then I attempted > to apply the same logic to a SP_DEVINFO_LIST_DETAIL_DATA structure and I'm > getting the same "The supplied user buffer is not valid for the requested > operation." after using the object in a SetupDixx method. > > That error is generated when I tried the following struct definitions and > setting for cbSize: > > ***** > [StructLayout(LayoutKind.Sequential)] > public struct SP_DEVINFO_LIST_DETAIL_DATA > { > public UInt32 cbSize; > public System.Guid classGuid; > public IntPtr remoteMachineHandle; > public string RemoteMachineName; > } > > SP_DEVINFO_LIST_DETAIL_DATA dList = new SP_DEVINFO_LIST_DETAIL_DATA(); > > dList.cbSize = (UInt32) Marshal.SizeOf(dList); > > *********** > > Per a suggestion from another forum poster, I tried this struct > definition: > > *************** > public const int MAX_PATH = 260; > public const int SP_MAX_MACHINENAME_LENGTH = (MAX_PATH + 3); > > [StructLayout(LayoutKind.Sequential)] > public struct SP_DEVINFO_LIST_DETAIL_DATA > { > [MarshalAs(UnmanagedType.U4)] > public UInt32 cbSize; > > [MarshalAs(UnmanagedType.Struct)] > public System.Guid classGuid; > > [MarshalAs(UnmanagedType.SysInt)] > public IntPtr remoteMachineHandle; > > [MarshalAs(UnmanagedType.ByValArray, SizeConst = > SP_MAX_MACHINENAME_LENGTH] > public char[] RemoteMachineName; > } > ***************** > This still produced the same error. However, since I'm developing on a > 64-bit machine, I changed "UnmanagedType.U4" to "UnmanagedType.U8", and > got a > different error: > > "Type SP_DEVINFO_LIST_DETAIL_DATA cannot be marshaled as an unmanaged > structure; no meaningful size or offset can be computed." > > I can't seem to find others using this structure in P/Invoke examples. > Does > anyone have any other ideas? > > Thanks! >
From: Philip Ries [MSFT] on 15 Apr 2010 16:10 Try using "string" type again and set the MarshalAs property to UnmanagedType.ByValTStr or similar (keep the SizeConst part). Brute force might answer the size question faster: try some nearby values for cbSize, for non-Unicode 64-bit it might be around 295. santapanda wrote: > Hello again, > > My problem with SP_DEVINFO_DATA cbSize was resolved. But then I attempted > to apply the same logic to a SP_DEVINFO_LIST_DETAIL_DATA structure and I'm > getting the same "The supplied user buffer is not valid for the requested > operation." after using the object in a SetupDixx method. > > That error is generated when I tried the following struct definitions and > setting for cbSize: > > ***** > [StructLayout(LayoutKind.Sequential)] > public struct SP_DEVINFO_LIST_DETAIL_DATA > { > public UInt32 cbSize; > public System.Guid classGuid; > public IntPtr remoteMachineHandle; > public string RemoteMachineName; > } > > SP_DEVINFO_LIST_DETAIL_DATA dList = new SP_DEVINFO_LIST_DETAIL_DATA(); > > dList.cbSize = (UInt32) Marshal.SizeOf(dList); > > *********** > > Per a suggestion from another forum poster, I tried this struct definition: > > *************** > public const int MAX_PATH = 260; > public const int SP_MAX_MACHINENAME_LENGTH = (MAX_PATH + 3); > > [StructLayout(LayoutKind.Sequential)] > public struct SP_DEVINFO_LIST_DETAIL_DATA > { > [MarshalAs(UnmanagedType.U4)] > public UInt32 cbSize; > > [MarshalAs(UnmanagedType.Struct)] > public System.Guid classGuid; > > [MarshalAs(UnmanagedType.SysInt)] > public IntPtr remoteMachineHandle; > > [MarshalAs(UnmanagedType.ByValArray, SizeConst = SP_MAX_MACHINENAME_LENGTH] > public char[] RemoteMachineName; > } > ***************** > This still produced the same error. However, since I'm developing on a > 64-bit machine, I changed "UnmanagedType.U4" to "UnmanagedType.U8", and got a > different error: > > "Type SP_DEVINFO_LIST_DETAIL_DATA cannot be marshaled as an unmanaged > structure; no meaningful size or offset can be computed." > > I can't seem to find others using this structure in P/Invoke examples. Does > anyone have any other ideas? > > Thanks! >
From: santapanda on 15 Apr 2010 17:22 Doron, I don't have C++ experience, and, as a beginner C# programmer, I'm trying to use these structures in a C# application. So I'm new to the Interop and Platform Invoke technologies; I'm picking up on what others have done and I'm trying to understand it as I go. That being said, I don't understand your response. Are you saying the problem is not with cbSize, but with the RemoteMachineName variable? "Doron Holan [MSFT]" wrote: > are you just blindly trying to brute force this? > > this is the native definition > > typedef struct _SP_DEVINFO_LIST_DETAIL_DATA_W { > DWORD cbSize; > GUID ClassGuid; > HANDLE RemoteMachineHandle; > WCHAR RemoteMachineName[SP_MAX_MACHINENAME_LENGTH]; > } SP_DEVINFO_LIST_DETAIL_DATA_W, *PSP_DEVINFO_LIST_DETAIL_DATA_W; > > > the marshaller has no idea that string RemoteMachineName must be > 1) inline in the marshalled structure vs a pinned pointer > 2) as an inlined field, a fixed size > > d > -- > > This posting is provided "AS IS" with no warranties, and confers no rights. > > > "santapanda" <santapanda(a)discussions.microsoft.com> wrote in message > news:EC03E8C2-A952-4108-BC66-A457927C3083(a)microsoft.com... > > Hello again, > > > > My problem with SP_DEVINFO_DATA cbSize was resolved. But then I attempted > > to apply the same logic to a SP_DEVINFO_LIST_DETAIL_DATA structure and I'm > > getting the same "The supplied user buffer is not valid for the requested > > operation." after using the object in a SetupDixx method. > > > > That error is generated when I tried the following struct definitions and > > setting for cbSize: > > > > ***** > > [StructLayout(LayoutKind.Sequential)] > > public struct SP_DEVINFO_LIST_DETAIL_DATA > > { > > public UInt32 cbSize; > > public System.Guid classGuid; > > public IntPtr remoteMachineHandle; > > public string RemoteMachineName; > > } > > > > SP_DEVINFO_LIST_DETAIL_DATA dList = new SP_DEVINFO_LIST_DETAIL_DATA(); > > > > dList.cbSize = (UInt32) Marshal.SizeOf(dList); > > > > *********** > > > > Per a suggestion from another forum poster, I tried this struct > > definition: > > > > *************** > > public const int MAX_PATH = 260; > > public const int SP_MAX_MACHINENAME_LENGTH = (MAX_PATH + 3); > > > > [StructLayout(LayoutKind.Sequential)] > > public struct SP_DEVINFO_LIST_DETAIL_DATA > > { > > [MarshalAs(UnmanagedType.U4)] > > public UInt32 cbSize; > > > > [MarshalAs(UnmanagedType.Struct)] > > public System.Guid classGuid; > > > > [MarshalAs(UnmanagedType.SysInt)] > > public IntPtr remoteMachineHandle; > > > > [MarshalAs(UnmanagedType.ByValArray, SizeConst = > > SP_MAX_MACHINENAME_LENGTH] > > public char[] RemoteMachineName; > > } > > ***************** > > This still produced the same error. However, since I'm developing on a > > 64-bit machine, I changed "UnmanagedType.U4" to "UnmanagedType.U8", and > > got a > > different error: > > > > "Type SP_DEVINFO_LIST_DETAIL_DATA cannot be marshaled as an unmanaged > > structure; no meaningful size or offset can be computed." > > > > I can't seem to find others using this structure in P/Invoke examples. > > Does > > anyone have any other ideas? > > > > Thanks! > > > . >
From: Doron Holan [MSFT] on 16 Apr 2010 13:16
see philip's response d -- This posting is provided "AS IS" with no warranties, and confers no rights. "santapanda" <santapanda(a)discussions.microsoft.com> wrote in message news:3BBFF335-9C34-4545-A49C-1014774ED3BA(a)microsoft.com... > Doron, > > I don't have C++ experience, and, as a beginner C# programmer, I'm trying > to > use these structures in a C# application. So I'm new to the Interop and > Platform Invoke technologies; I'm picking up on what others have done and > I'm > trying to understand it as I go. > > That being said, I don't understand your response. Are you saying the > problem is not with cbSize, but with the RemoteMachineName variable? > > "Doron Holan [MSFT]" wrote: > >> are you just blindly trying to brute force this? >> >> this is the native definition >> >> typedef struct _SP_DEVINFO_LIST_DETAIL_DATA_W { >> DWORD cbSize; >> GUID ClassGuid; >> HANDLE RemoteMachineHandle; >> WCHAR RemoteMachineName[SP_MAX_MACHINENAME_LENGTH]; >> } SP_DEVINFO_LIST_DETAIL_DATA_W, *PSP_DEVINFO_LIST_DETAIL_DATA_W; >> >> >> the marshaller has no idea that string RemoteMachineName must be >> 1) inline in the marshalled structure vs a pinned pointer >> 2) as an inlined field, a fixed size >> >> d >> -- >> >> This posting is provided "AS IS" with no warranties, and confers no >> rights. >> >> >> "santapanda" <santapanda(a)discussions.microsoft.com> wrote in message >> news:EC03E8C2-A952-4108-BC66-A457927C3083(a)microsoft.com... >> > Hello again, >> > >> > My problem with SP_DEVINFO_DATA cbSize was resolved. But then I >> > attempted >> > to apply the same logic to a SP_DEVINFO_LIST_DETAIL_DATA structure and >> > I'm >> > getting the same "The supplied user buffer is not valid for the >> > requested >> > operation." after using the object in a SetupDixx method. >> > >> > That error is generated when I tried the following struct definitions >> > and >> > setting for cbSize: >> > >> > ***** >> > [StructLayout(LayoutKind.Sequential)] >> > public struct SP_DEVINFO_LIST_DETAIL_DATA >> > { >> > public UInt32 cbSize; >> > public System.Guid classGuid; >> > public IntPtr remoteMachineHandle; >> > public string RemoteMachineName; >> > } >> > >> > SP_DEVINFO_LIST_DETAIL_DATA dList = new SP_DEVINFO_LIST_DETAIL_DATA(); >> > >> > dList.cbSize = (UInt32) Marshal.SizeOf(dList); >> > >> > *********** >> > >> > Per a suggestion from another forum poster, I tried this struct >> > definition: >> > >> > *************** >> > public const int MAX_PATH = 260; >> > public const int SP_MAX_MACHINENAME_LENGTH = (MAX_PATH + 3); >> > >> > [StructLayout(LayoutKind.Sequential)] >> > public struct SP_DEVINFO_LIST_DETAIL_DATA >> > { >> > [MarshalAs(UnmanagedType.U4)] >> > public UInt32 cbSize; >> > >> > [MarshalAs(UnmanagedType.Struct)] >> > public System.Guid classGuid; >> > >> > [MarshalAs(UnmanagedType.SysInt)] >> > public IntPtr remoteMachineHandle; >> > >> > [MarshalAs(UnmanagedType.ByValArray, SizeConst = >> > SP_MAX_MACHINENAME_LENGTH] >> > public char[] RemoteMachineName; >> > } >> > ***************** >> > This still produced the same error. However, since I'm developing on a >> > 64-bit machine, I changed "UnmanagedType.U4" to "UnmanagedType.U8", and >> > got a >> > different error: >> > >> > "Type SP_DEVINFO_LIST_DETAIL_DATA cannot be marshaled as an unmanaged >> > structure; no meaningful size or offset can be computed." >> > >> > I can't seem to find others using this structure in P/Invoke examples. >> > Does >> > anyone have any other ideas? >> > >> > Thanks! >> > >> . >> |