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IDL File Entry:
[id(5),helpstring("method SetData")] HRESULT SetData([in] ULONG size, [in,size_is(size)] BYTE *pData);
Method Override:
STDMETHODIMP CDataProvider::SetData(ULONG size, BYTE* bytArray)
{
// TODO: Add your implementation code here
BYTE byt[6];
int i=0;
for(;*bytArray!=0;i++)
{
byt[i]=*bytArray;
::MessageBox(NULL,(LPCTSTR)"he","Msg",MB_OK);
bytArray++;
}
byt[i]=0;
return S_OK;
}
Client:
IDataProvider* pServer=NULL;
HRESULT hr=::CoCreateInstance(CLSID_CDataProvider,NULL,CLSCTX_LOCAL_SERVER,IID_IDataProvider,(LPVOID*)&pServer);
short sSize = 5;
BYTE* pBytes;
//Allocate the shared Memory
pBytes = reinterpret_cast<byte *="">(CoTaskMemAlloc(sSize * sizeof(BYTE)));
if(pBytes == NULL)
return;
::memset(pBytes, 0, sSize);
pBytes[0]='K';
pBytes[1]='K';
pBytes[2]='R';
pBytes[3]='D';
pBytes[4]=NULL;
pServer->SetData(5,pBytes);
CoTaskMemFree(pBytes); //Free the shared Memory
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There's many problems here. Firstly you haven't escaped the post properly so it's hard to read. For example:
K ARUN KUMAR wrote: reinterpret_cast(CoTaskMemAlloc(sSize * sizeof(BYTE)));
You didn't escape the < and > so some important code is missing.
You didn't bother to point out explicitly which code is in the client and which is in the server.
Surrounding code in <pre> and </pre> tags is generally considered polite, not to mention the fact that it makes the code more readable (uses a fixed width font).
You also didn't bother to ensure the code was properly indented.
In short, if you want help, put some effort in asking for it (at least as much as I do in replying!).
Now onto the code....
K ARUN KUMAR wrote: BYTE byt[6];
int i=0;
for(;*bytArray!=0;i++)
{
byt[i]=*bytArray;
::MessageBox(NULL,(LPCTSTR)"he","Msg",MB_OK);
bytArray++;
}
byt[i]=0;
This doesn't make use of size. Ever heard of buffer overruns?
What's with the (LPCTSTR)"he"? Get rid of the cast. If the string is of the wrong type casting just turns what would have been a compiler error into a runtime error and solves nothing.
K ARUN KUMAR wrote:
//Allocate the shared Memory
pBytes = reinterpret_cast(CoTaskMemAlloc(sSize * sizeof(BYTE)));
if(pBytes == NULL)
return;
CoTaskMemAlloc does ***NOT*** allocate shared memory! You don't need to use it in this case (although there is no harm in using it).
Can you tell me more about what actually happens when you run it. Does the CDataProvider::SetData function get called? Does it display a MessageBox? How many times?
Steve
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Sorry Steve.
Im new to the message posts.
I will follow ur guidelines for sure from next time.
Coming to our discussion, iam getting the message box only once,
meaning that only one byte is marshalled.
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Post the entire IDL file.
Steve
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import "C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\prsht.idl";
import "C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\mshtml.idl";
import "c:\program files\microsoft visual studio .net 2003\vc7\platformsdk\include\dimm.idl";
import "C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\mshtmhst.idl";
import "c:\program files\microsoft visual studio .net 2003\vc7\platformsdk\include\docobj.idl";
import "C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\exdisp.idl";
import "C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\objsafe.idl";
[
object,
uuid(A12EAEC2-2B64-470B-93AF-EFE0855DD3AC),
dual,
helpstring("IDataProvider Interface"),
pointer_default(unique)
]
#line 14 "d:\\vc++\\sample applications\\bytcomp\\dataprovider.h"
interface IDataProvider : IDispatch {
#line 16 "d:\\vc++\\sample applications\\bytcomp\\dataprovider.h"
[id(1),helpstring("method GetSafeArray")] HRESULT GetSafeArray([out,retval] VARIANT *vtSafeArray);
[id(2),helpstring("method SetByteData")] HRESULT SetByteData([in] BYTE *bytArray);
[id(3),helpstring("method SetArray")] HRESULT SetArray([in]BSTR bstrArray);
[id(4),helpstring("method SetThings")] HRESULT SetThings([in]BYTE **ppThings );
[id(5),helpstring("method SetData")] HRESULT SetData([in] ULONG size, [in,size_is(size)] BYTE *pData);
};
[ version(1.0), uuid(0381FBF3-32C1-4AF1-B6DD-EFB51815DD72), helpstring("BytComp 1.0 Type Library") ] library BytComp
{
importlib("stdole2.tlb");
importlib("olepro32.dll");
[
version(1.0),
uuid(8816EAAA-91D5-4DCF-BA1A-DD699529D099),
helpstring("DataProvider Class")
]
#line 36 "d:\\vc++\\sample applications\\bytcomp\\dataprovider.h"
coclass CDataProvider {
interface IDataProvider;
};
}
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Ok. Open the registry editor and search for the following key:
{A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}
If you find if right click on it and select "Export". Post the contents of the file this generates.
Steve
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Hi Steve, i found two registry entries..
1st Entry
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\Interface\{A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}]
@="IDataProvider"
[HKEY_CLASSES_ROOT\Interface\{A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}\NumMethods]
@="12"
[HKEY_CLASSES_ROOT\Interface\{A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}\ProxyStubClsid]
@="{00020424-0000-0000-C000-000000000046}"
[HKEY_CLASSES_ROOT\Interface\{A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}\ProxyStubClsid32]
@="{00020424-0000-0000-C000-000000000046}"
[HKEY_CLASSES_ROOT\Interface\{A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}\TypeLib]
@="{0381FBF3-32C1-4AF1-B6DD-EFB51815DD72}"
"Version"="1.0"
2nd Registry Entry:
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\CLSID\{A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}]
@="PSFactoryBuffer"
[HKEY_CLASSES_ROOT\CLSID\{A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}\InProcServer32]
@="D:\\VC++\\Sample Applications\\BytComp\\DebugPS\\BytCompPS.dll"
"ThreadingModel"="Both"
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First note that the proxy-stub you built is creatable:
K ARUN KUMAR wrote: [HKEY_CLASSES_ROOT\CLSID\{A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}\InProcServer32]
@="D:\\VC++\\Sample Applications\\BytComp\\DebugPS\\BytCompPS.dll" "ThreadingModel"="Both"
But your interface isn't using it:
K ARUN KUMAR wrote: [HKEY_CLASSES_ROOT\Interface\{A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}\ProxyStubClsid32]
@="{00020424-0000-0000-C000-000000000046}"
{00020424-0000-0000-C000-000000000046} is the universal marshaller, not your proxy-stub ({A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}).
Also I notice your interface is marked with [dual]. This means the interface has to be automation compatible and should only use a limited number of types (which doesn't include BYTE arrays).
Do you get warnings when you compile the IDL file? Did you ignore them?
Since you exported these keys you're free to tinker with them as they can easily be restored using the exported files.
Change this key:
[HKEY_CLASSES_ROOT\Interface\{A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}\ProxyStubClsid32]
@="{00020424-0000-0000-C000-000000000046}"
So that it looks like this:
[HKEY_CLASSES_ROOT\Interface\{A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}\ProxyStubClsid32]
@="{A12EAEC2-2B64-470B-93AF-EFE0855DD3AC}"
NOTE: Don't alter the exported files, make the changes in the registry. Alternatively copy the exported file, make the change in the copy, then double click the copy.
Steve
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Hi Steve,
You are amazing. The change worked.
But when iam building the server,
it again modifying the registry
setting to default Marshaller GUID.
How to set my ProxtStub GUID as default?
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The problem is your interface is marked as an automation interface but it uses types that are not automation compatible. As I said, I'm sure the MIDL compiler would have warned you about this, and you should always investigate compiler warnings. The are a number of ways to fix this:
- Don't use an automation compatible interface. Remove the
dual and all the [id] attributes, and derive from IUnknown instead of IDispatch. You will not need the IDispatchImp base class in you server implementation either. - Add another interface to the object (which isn't
dual and derives from IUnknown, as described above) to contain the non-automation compatible methods. - Manually make the changes I described after RegisterTypeLib[^] makes the "wrong" ones. This is a hack though: why use an automation-compatible interface that automation clients will not be able to call?
- Give my posts good marks
Steve
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Thanks a lot buddy.
Sure..
Arun
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Hi,
I've a windows class library and would like to create ActiveXControl for that. I regstered the dll using RegAsm.exe and created the below html in local IIS(wwwroot) and accessed. But its not showing the design.
Please let me know if I missed any steps in creation of ActiveXControl. Thanks in advance.
<html>
<body color=white>
<hr>
Please note that you MUST load this HTML document from your local IIS, or from a TRUSTED SITE <hr>
<font face=arial size=1>
<OBJECT id="myControl1" name="myControl1" classid="0AE91E82-5EE3-4d27-B7ED-CE2C0B059BB7" width="500" height="200">
</OBJECT>
</font> <hr>
</body> </html>
classid is the GUID of the class.
In one of the class, I declared the GUID as below.
[ Guid("0AE91E82-5EE3-4d27-B7ED-CE2C0B059BB7"),
InterfaceType(ComInterfaceType.InterfaceIsDual),
ComVisible(true)]
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<object id="myControl1" classid="CLSID:0AE91E82-5EE3-4d27-B7ED-CE2C0B059BB7" <="" object="">
Also, if your activeX is not signed, ensure your browser's security level is set to low, and unsigned activeX controls are allowed to load.
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I tried the above as per your message. Still the problem exists..
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Hello,
Instead of IDispatch, If I have some COM component that exposes its methods through IUnknown, can we call its methods at runtime? Problem is Invoke memeber only available in case of IDispatch
Regards
Usman
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Hello,
I am getting address of COM function by loading type library (TLB) and iterating over types using ITypeLib and ITypeInfo.
After calling AddressOfMember function of ITypeInfo I am facing following exception:
System.Runtime.InteropServices.COMException (0x800288BD): Wrong module kind for the operation. (Exception from HRESULT: 0x800288BD (TYPE_E_BADMODULEKIND)) at System.Runtime.InteropServices.ComTypes.ITypeInfo.AddressOfMember(Int32 memid, INVOKEKIND invKind, IntPtr& ppv).
Any idea how to get rid of this excpetion?
for (int curFunc = 0; curFunc <iTotalfunc ; iTotalFuncs;curFunc++)
{
try
{
IntPtr ppFuncDesc;
oTypeInfo.GetFuncDesc(curFunc, out ppFuncDesc);
funcDesc = new System.Runtime.InteropServices.ComTypes.FUNCDESC();
funcDesc = (System.Runtime.InteropServices.ComTypes.FUNCDESC)Marshal.PtrToStructure(ppFuncDesc,typeof(System.Runtime.InteropServices.ComTypes.FUNCDESC));
int cNames;
//if (funcDesc.)
oTypeInfo.GetNames(funcDesc.memid, m_strFuncNames, 1, out cNames);
switch (funcDesc.invkind)
{
case System.Runtime.InteropServices.ComTypes.INVOKEKIND.INVOKE_FUNC:
//Console.WriteLine(" (method)");
//_infoType = "Function";
//_property = false;
string strSignature = "";
if (funcDesc.cParams> 0)
{
IntPtr addrssOfMember;
oTypeInfo.AddressOfMember(funcDesc.memid, //Here where exception occured System.Runtime.InteropServices.ComTypes.INVOKEKIND.INVOKE_FUNC, out addrssOfMember);
}//end of if
}//end of switch
}//end of try
}//end of for
Regards
Usman
-- Modified Friday, May 14, 2010 3:06 AM
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hi,
I need to do language localization using XML in VC++ (MFC).
I need to do mapping using XML file and i need to scan the XML file for the desired language, so that my output would be in my desired language.
I have no idea, how to go about it.
Please Support
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Hello,
I need to write type libraries in C#.NET. Type library is of unmanaged COM servers. How..?
Regards
Usman
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Type libraries can be accessed using the ITypeInfo and ITypeLib interfaces.
From C# you can do COM interop to use these interfaces.
Here is a good article on COM Interop[^].
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#include "stdafx.h"
#include "windows.h"
Hi All,
In the below mentioned code. i want to use MSCOMM32.OCX file API to my C++ code.
i am facing an issue when i am getting HResult from the cocreateInstance.
Kindly let me know what should i do to access MSCOMM32.OCX API.
#include "atlbase.h"
#import "C:\\WINDOWS\\system32\\MSCOMM32.OCX" no_namespace raw_interfaces_only raw_native_types no_implementation named_guids
int main(int argc, _TCHAR* argv[])
{
GUID iid = {0xE6E17E90, 0xDF38, 0x11CF, 0x8E, 0x74,0x00,0xA0,0xC9,0x0F,0x26,0xF8};
GUID Clsid = {0x648A5603, 0x2C6E, 0x101B, 0x82, 0xB6, 0x0,0x0, 0x0, 0x0, 0x0, 0x14};
IMSComm **ppv = 0;
HRESULT hRet = 0;
hRet = CoInitialize(NULL);
hRet = CoCreateInstance (Clsid, NULL,CLSCTX_LOCAL_SERVER,iid,(void**)&ppv);
_bstr_t pbstrSettings("9600,N,8,1");
(*ppv)->put_PortOpen(1);
(*ppv)->put_Settings(pbstrSettings);
(*ppv)->AboutBox();
return 0;
}
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The activeX is probably not registered.
Which OS are you using?
Open a command prompt with admin privileges, change to the system32 directory and type the command regsvr32 mscomm32.ocx.
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pallaka wrote: hRet = CoCreateInstance (Clsid, NULL,CLSCTX_LOCAL_SERVER,iid,(void**)&ppv);
As a rule, OCX is an in-proc server.
With best wishes,
Vita
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I have read that COM+ is not portable. It is tightly coupled.
Please provide me a pointer to understand this better.
I gather that, COM+ which is a runtime environment should be tightly coupled
with the operating system.
Why I am confused is because, ultimately COM+ is based on components and
components are binary and ready to use that can move across dlls and
across machines ... so where is tight coupling?
Regards,
Net Questions
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