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Can you send some sample code for this ??
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I've been getting this error from time to time:
ASP 0177 The component is configured to use synchronization and a thread has timed out waiting to enter the context.
Is anybody familiar with this error message?
Would appreciate any help
Thanx!
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;PDear all,
I am developing an application for Windows NT/2000/XP in which I want to create a folder whose size should not exceed 5MB. And should promt for error if data exceeds 5MB
Is there any way to fix size of folder ?
( I know that there is ICopyHook for this but i donot know much about ATL COM)
Please comment!
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I am new to COM. I have been trying to incorporate the WebBrowser control into an MFC program. I have been using as an example and article from MSDN -http://www.microsoft.com/mind/0798/webbrowser.asp.
In this example VBScript is used. I have been trying to use JavaScript instead. I am unable to change a value with a COM method when I pass a value from Javascript;
IN VBSCRIPT:
sub get_property_value_onclick()
i=window.external.get_propert(property_name.value, value)
if i<>0 then
property_value.value=value
MsgBox property_name.value & " = " & value, 0, "Successfully retrieved property"
else
MsgBox "Cound not find value for property '" & property_name.value & "'", 0 , ""
end if
end sub
In Javascript:
function get_property_value_onclick(namevalue,value)
{
var value = "test";
var i = window.external.get_property(property_name.value,value)
if (i != 0)
{
property_value.value=value;
var strMsg;
strMsg = "Successfully retrieved property:" + property_name.value + " = " + value ;
alert( strMsg);
}
else
{
var strMsg;
strMsg = "Could not retrieve" + property_name.value + " = " + value ;
alert( strMsg);
}
}
The COM Method:
HRESULT my_application::get_property(LCID lcid,
WORD wFlags,
DISPPARAMS* pdispparams,
VARIANT* pvarResult,
EXCEPINFO* pexcepinfo,
UINT* puArgErr)
{
if (wFlags & DISPATCH_METHOD)
{
if (pdispparams->cArgs!=2)
{
return DISP_E_BADPARAMCOUNT;
}
// force to string
VARIANT arg1;
VariantInit(&arg1);
HRESULT hr=VariantChangeType(&arg1,
&pdispparams->rgvarg[1],
0,
VT_BSTR);
if (FAILED(hr))
{
*puArgErr=1;
return hr;
}
string str;
com_util::bstr2string(arg1.bstrVal,str);
// try to find element
string2variant_map::iterator it=propertymap.find(str);
if (it==propertymap.end())
{
if (pvarResult)
{
V_VT(pvarResult) =VT_BOOL;
V_BOOL(pvarResult)=FALSE;
return S_OK;
}
if (!pexcepinfo)
{
return E_INVALIDARG;
}
// raise exception
memset(pexcepinfo,0,sizeof(EXCEPINFO));
pexcepinfo->wCode =1001;
pexcepinfo->bstrSource =SysAllocString(L"WebBrowser Demo");
pexcepinfo->bstrDescription =SysAllocString(L"No entry for the key");
return DISP_E_EXCEPTION;
}
hr = VariantCopy(pdispparams->rgvarg[0].pvarVal,&(*it).second);
if (pvarResult)
{
V_VT(pvarResult) =VT_BOOL;
V_BOOL(pvarResult)=TRUE;
}
return S_OK;
}
return DISP_E_MEMBERNOTFOUND;
}
The function VariantCopy(pdispparams->rgvarg[0].pvarVal,&(*it).second);
returns a bad varibale HRESULT. Bu tit works OK in VBSCRIPT. Any idea on how to solve this?
thanks,
RAM_MR
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I have an MFC application with an atl object. Now I want to know if a user started the application or if the application was started by the scum, so I can (amongst others) deside whether to show or hide the windows of the application. Anyone knows how to do this ?
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Never mind, I already found what I was looking for: AfxOleGetUserCtrl().
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Hi, I need to create a new Activex control by sub classing another Activex control. This will retain all the old functionality plus some other functions can also be added, i have tried doing it through the MFC ATL wizard, but that only create a wrapper araound it. Also MFC's ActiveX control wizard does seem to support sub classing of some MS standard controls only.
if you have a way to acheive this then please do help.
Mayank Goyal
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Hi, I have an MFC application on which I want to put a COM interface so other applications can interface with my application. I succeeded in doing this, but now I have several object that can be created from outside my application. What I want is to provide a single object that creates the other objects. Can (and if so, how?) I shield these objects so they can not be created from outside my own application ?
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One solution is containment. Another solution is aggregation, but only allow access to certain interfaces.
Kuphryn
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Kuphryn, thanx for your answer, but could you elaborate your answer? How does containment work? Can you show me an example or article?
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Concept of containment is as C++'s "has a" inheritance relationship. In other words, the outside COM object containers interfaces that will then utilize the inner object. The outsider exposes whatever functions it wants.
Kuphryn
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Your non-creatable object should not have the class-factory. However I don't know how to make it possible in MFC.
With best wishes,
Vita
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I found what I was looking for. I just have to remove the coclasses from the idl file, so the classes are not registered. This way external applications can only access the main (co-)class. Now the 'non-coclasses' cannot be created with CoCreateInstance anymore, instead they have to be created by calling their own static CreateInstance method.
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I want to export data from a MFC program to EXCEL 97.
The function prototypes are in excel8.h
This is all part of excel8.olb. The only documentation I can find is for VB (vbaxl8.hlp on the MS Office distribution CD)
WHERE CAN I FIND THE DOCUMENTATION FOR THE FUNCTIONS OF excel8.h (for C/C++ not VB)
Anybody who knows COM, and OLE Automation should know...
I am just a rookie when it comes to this part of programming
Ethernal gratitude is guaranteed...
Daniela
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I have to reply to my own post...
There is NO documentation for EXCEL Automation for C++.
It is extremely difficult using the VB documentation to get the C++ code right.
For example
range.PasteSpecial(Paste, Operation, SkipBlanks, Transpose)
In VB, all 4 parameters are VARIANTS
in the C prototype file excel8.h, the first two parameters
are of type long.
The "#define" for parameter Paste can nowhere be found
I found a pathetic way to work around my problems.
Just record a bunch of macros in EXCEL and call them from the C program
myapp.Run( COleVariant("MyMacro"),...)
//there are 30!!! optional parameters instead of the periods
Daniela
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I am having the same problem. Augh.
If you find any good documentation please let me know.
Mardigin
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hi there..
i am enabling mfc in an activex control and what happens is that when i debug it ..it throws an access violation in OLE32.lib..
dont know why..ne ideas? 
regards
safee
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thanks amigo..
it got resolved..
i logged on today ... sorry for keeping u waiting..
regards
safee
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I [users] get this error when the service has run for a long time...
Any idea about this?
the event log shows..
----------------------------------------------------------------------
The COM+ Services DLL (comsvcs.dll) was unable to load because allocation of thread local storage failed.
Process Name: MyExe.exe
Error Code = 0x80070008 : Not enough storage is available to process this command.
COM+ Services Internals Information:
File: .\comsvcs.cpp, Line: 289
----------------------------------------------------------------------
After seraching in the net, I realized that I am not the only one to get this problem... There are many executables which get this error. Apparently we are all doing the same kind of process.. [like calling CoInit many times (with proper un-inits)..etc]
But, nowhere a solution is discussed... any luck here??
Thanks for your time!
![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
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I have done a GIS implementation in VC++ with Ms-access as back end iwant to convert this into Activex control & place it on the web .Can Anybody helpme out?
A.Satish Kumar
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Hi,
I've created a DCOM Server through the ATL COM Appwizard, I've added a custom (IUnknown) interface and added some methods as below;
[helpstring("method GetComputerName")] HRESULT GetComputerName([out] BSTR *pName);
[helpstring("method GetComputerTime")] HRESULT GetComputerTime([out] long *lTime);
I was able to compile and call these methods thru the client and successfully get the values even from a remote machine.
Now I added a CLIENTINFO Structure in a header file and included the file in the idl using the #import directive,
#import "ClientInfo.h"
I added another method with a pointer to the ClientInfo structure as the parameter as follows
[helpstring("method GetComputerName")] HRESULT GetComputerName([out] LPCLIENTINFO pClInfo);
I was able to compile the code, but when i call this function from the client code, i get an exception and it crashes.
I want to know if we can pass User-Defined Data structures as parameters in a DCOM server? Why is this giving a problem even though i have derived the interface thru IUnknown? Shud we use VARIANTs here, but why shud we since i havent specified an IDispatct \ Automation interface?
The same thing works fine if i create an IN_PROC DLL.
Please tell me how we can achieve this in DCOM, also pls direct me to any examples or tutorials or articles on this.
Thanks,
Anand
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Thanks John. Cant this be done if we do custom marshaling. And I have seen an RPC server which takes Struture Pointers as above as parameters in the IDL file.
Thanks
Anand
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Anand Vinod wrote:
Cant this be done if we do custom marshaling.
I believe it can if you do custom marshaling.
John
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Your [out] parameter is incorrect. A pointer-to-a-pointer must be passed in (similar to QueryInterface) :-
HRESULT GetComputerName([out] LPCLIENTINFO *pClInfo);
OR
HRESULT GetComputerName([out] CLIENTINFO **pClInfo);
Implementation :-
HRESULT GetComputerName(CLIENTINFO **pClInfo)
{
*pClInfo = new CLIENTINFO;
(*pClInfo)->m_bstrComputerName = SysAllocString(L"");
return S_OK;
}
The single level pointer that you were passing is only valid within a single process address space.
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