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Joaquín's thread makes some good points, but _sometimes_ it can be informative to at least try to see whats causing the exception (especially if you find yourself in a situation where all these fce's are clouding up your output window).
With your app running in debug select Exceptions from the debug menu. Highlight Access Violation, select 'Stop Always' and Change.
Now, go to your app and move the mouse over a toolbar icon. You should now get drop into the debugger when the exception is detected by the debugger.
If you find yourself looking at assembly, you may still be able to glean some info from the call stack window (Alt+7) though sometimes not. This can be especially annoying on a system with no System DLL Symbol files installed, or 98 which doesn't ship them. (I bet you're running on 98, if a standard App wiz app is doing this - 98 has some grotty comctl32 aspects).
Anyway, application code that traps exceptions might do so far away from the code that actually caused the fault, and this First Chance vectoring by the debugger might sometimes be the only way to pinpoint the actual location of the problem. It also alerts you to the fact that some DLL or whatever caused and trapped an exception - which, as Joaquín points out, may be no big concern.
Try placing a call to IsBadReadPtr(0, 100) in your views OnDraw method to see what I mean. This fn pushes an exception handler onto the stack then trys to read the memory - if an access violation occurs (as it will with an addr of 0), the int 5 trap handler in the debugger gets it first (hence 'first chance') before its handled in kernel32, so you should see lots of these lines output. The option you checked above allows you to drop right into the code of IsBadReadPtr (at least on NT) when this trap occurs.
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Oh, and by the way, if this is win98 the next time you see these exceptions try a release build to see if it crashes when you mouse over a toolbar button. If it does, its not your fault - probably explorer will crash in the same way till you reboot.
After rebooting, invoke explorer first and leave it running before you start VC. Might make a difference. There's a page somewhere that explains this - you might search for comctl32.dll and win98.
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Hi,
When the user click on another control and the ´combobox has the focus and the list box is currently opened, the combobox won't loose the focus.Is there any way for the other control to get the focus when the user clicks on it eventhough the listbox of the combobox is opened.
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use 'SetFocus()' function
Mazy
Don't Marry a Person You Can Live With...
Marry Someone You Can Not Live Without
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Hi,
I'm trying to create a transparent dialog only, when I try to set the WS_EX_LAYERED style I get a compiler error. I installed the August 2001 SDK but that made no difference. Where is WS_EX_LAYERED defined so that I can include it?
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Try inserting
#define WINVER 0x500
#define _WIN32_WINNT 0x0500 before the inclusion of the Windows headers.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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Thanks for the tip, it worked. I'd just tried putting those defines in the preprocessor directives. I understand now that these defines tell the compiler to use the SDK headers instead of the standard ones.
I have realised that I cannot achieve what I needed anyhow. For a start the transparent window that I wanted is a to be a child window. The SDK documentation says that's not possible.
Also, my app is an MDI and in the views I am rendering with OpenGL. It seems I'm getting flickering where the dialog and GL windows appear to compete when painting. Perhaps I'm doing something wrong...
Thanks again.
Matthew
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To avoid flickering, you should be doing your stuff in OnEraseBkgnd (and not calling CDialog::OnEraseBkgnd from the overriden handler). Are you already doing that?
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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I tried to do that, but didn't see the handler listed in the class wizard. I'm starting to realise that this doesn't the handler isn't there to overridden.
Thanks
matthew
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That pesky message filter again... Please open the MFC wizard, go to the Class Info tab and select the option "Window" in the Message fitler combobox. Now the message WM_ERASEBKGND should be appearing in the list of overrideable messages.
I wonder why the NS guys decided to put such a thing. It takes ages till one first discovers it (usually on a "nervous breakdown" mood), and moreover it's four tabs away from the list that it modifies!
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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Hello
As the documentation state, printf function print to stdout. The problem is: in my windows application, I open a normal window, and now I ask:
where is in this situation stdin?????
Could I use printf function to write on a window user area?? Is any trick to acomplish this task?.
Thanks
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I can use NetUserAdd to create a user and NetLocalGroupAddMembers to assign it to a group. I need to give the name of the group. Therefore, if I specify 'Administrators', it will only work on English systems.
How to do it on any system (Windows 2000), such as French, Italian, Spanish ,...
Thank you for your answers !
P.S. : I do not want to check the system language, and manage all the translations of 'Administrators', 'Guest', ... I want it to work on ANY language 
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Hi all,
I know Win2000 proffesional supported Farsi language ...
But i can't see it in Language List in Win2000 ! 
Can anybody help me ?
My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html
Hadi Rezaie
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I found my answer
My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html
Hadi Rezaie
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void Investors:: insertionSort(Investor* investorsList, int n)
{
int j, p;
Investor temp;
for(p=1; p<n; p++)
="" {
="" temp="investorsList[p];
" for(j="p;" j=""> 0 && investorsList[j-1] > temp; j--)
investorsList[j] = investorsList[j - 1];
investorsList[j] = temp;
}
}
<\pre>
C:\Windows\Desktop\Project2\Project.cpp(630) : error C2676: binary '>' : 'class Investor' does not define this operator or a conversion to a type acceptable to the predefined operator
Error executing cl.exe.
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First of all, please tick in the "Display this message as-is (no HTML)" checkbox. Your code comes as garbage since '<' characters mess up with HTML.
Your problem lies in the piece of sentence investorsList[j-1] > temp. I guess you're trying to compare Investors somehow for sorting purposes. For this to work, you have to define the corresponding comparison operator:
bool operator >(const Investor& i1,const Investor& i2)
{
}
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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Hi!
Is there an easy way how an MFC program can retrieve its own location in means of drive and folders? I've been searching thru the whole MSDN Library for a couple of times and got none the wiser. Right now I use GetCommandLine() and search for the first two quotes, as they wrap the program's name and location. But I think this is quite risky, so I'd appreciate your help.
Thanks,
Martin
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GetModuleFileName(NULL).
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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When I am trying to build my project in VC++ 6.0, Windows 95,with some files updated, all of my files in that project are also compiling.(I have tried build selection also). can any one suggest what i have to do for compiling only those
files.
Thanks for reply....
Kishore
Kishore
miel, senate
bangalore
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I think the file creation dates dont match the system date. Maybe you developed them on a system with a futuristic wrong date.
Nish
Nish was here, now Nish has gone;
He left his soul, to turn you on;
Those who knew Nish, knew him well;
Those who didn't, can go to hell.
I like to ![Jig | [Dance]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/jig.gif) on the Code Project
Sonork ID 100.9786 voidmain
www.busterboy.org
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I have written a function that given an Interface GUID, class name, method name, and parameters; it will execute the method. Now I need to get the return values for byref parameters.
I call invoke as follows
hr = pdisp->Invoke(dispid,IID_NULL,LOCALE_SYSTEM_DEFAULT,DISPATCH_METHOD,&dispparams,pval,&excep,&uArgErr);
Now I want to return the values of dispparams.rgvarg out through a safe array.
Can anyone help??
-------------------------------
STDMETHODIMP CClassWrapper::RunMethod(BSTR strIIDImplemented, BSTR strClassName, BSTR strFunctionName, INT intArgCount, VARIANT * ArgType, VARIANT * ArgVals, VARIANT * ArgValsRet, VARIANT *pval)
{
HRESULT hr = S_OK; // Result code
IID ImplemInteface; // Interface to implement
CLSID clsid; // CLSID of ActiveX object.
LPDISPATCH pdisp = NULL; // IDispatch of ActiveX object.
DISPID dispid; //dispatch id of function
//get the Interface Pointer from Giud passed in
hr = IIDFromString(strIIDImplemented,&ImplemInteface);
if (FAILED(hr))
{
return hr;
}
// Retrieve CLSID from the ProgID that the user specified.
hr = CLSIDFromProgID(strClassName, &clsid);
if (FAILED(hr))
{
return hr;
}
//init com
hr = OleInitialize(NULL);
// create object
hr = CoCreateInstance(clsid, NULL, CLSCTX_SERVER, ImplemInteface, reinterpret_cast<void**>(&pdisp) );
if (FAILED(hr))
{
CoUninitialize();
return hr;
}
//get id for function
hr = pdisp->GetIDsOfNames(IID_NULL,&strFunctionName,1, LOCALE_SYSTEM_DEFAULT,&dispid);
if (FAILED(hr))
{
CoUninitialize();
return hr;
}
SAFEARRAY *sa, *saTypes, *saReturn, *saDisp ;
sa = (*ArgVals->pparray);
saTypes = (*ArgType->pparray);
if(pval) ::VariantClear(pval);
DISPPARAMS dispparams = {NULL,NULL,0,0};
if (intArgCount > 0 )
{
dispparams.cArgs = intArgCount;
dispparams.cNamedArgs = 0;
dispparams.rgdispidNamedArgs = NULL;
dispparams.rgvarg = new VARIANTARG[intArgCount];
VARIANT* rgElems, *rgElemsTypes, *rgElemRets;
SafeArrayAccessData(sa, (LPVOID*)&rgElems);
SafeArrayAccessData(saTypes, (LPVOID*)&rgElemsTypes);
for(int i=intArgCount-1;i>=0;i--)
{
switch (rgElemsTypes[i].intVal)
{
case VT_UI1:
dispparams.rgvarg[i].vt = VT_UI1;
dispparams.rgvarg[i].bVal = rgElems[i].bVal;
break;
case VT_I2:
dispparams.rgvarg[i].vt = VT_I2;
dispparams.rgvarg[i].iVal = rgElems[i].iVal;
break;
case VT_I4:
dispparams.rgvarg[i].vt = VT_I4;
dispparams.rgvarg[i].lVal = rgElems[i].lVal;
break;
case VT_R4:
dispparams.rgvarg[i].vt = VT_R4;
dispparams.rgvarg[i].fltVal = rgElems[i].fltVal;
break;
case VT_BOOL:
dispparams.rgvarg[i].vt = VT_BOOL;
dispparams.rgvarg[i].boolVal = rgElems[i].boolVal;
break;
case VT_CY:
dispparams.rgvarg[i].vt = VT_CY;
dispparams.rgvarg[i].cyVal = rgElems[i].cyVal;
break;
case VT_BSTR:
dispparams.rgvarg[i].vt = VT_BSTR;
dispparams.rgvarg[i].bstrVal = rgElems[i].bstrVal;
break;
case VT_UNKNOWN:
dispparams.rgvarg[i].vt = VT_UNKNOWN;
dispparams.rgvarg[i].punkVal = rgElems[i].punkVal;
break;
case VT_DISPATCH:
dispparams.rgvarg[i].vt = VT_DISPATCH;
dispparams.rgvarg[i].pdispVal = rgElems[i].pdispVal;
break;
case VT_ARRAY:
dispparams.rgvarg[i].vt = VT_ARRAY;
dispparams.rgvarg[i].parray = rgElems[i].parray;
break;
case VT_VARIANT:
dispparams.rgvarg[i].vt = VT_VARIANT;
dispparams.rgvarg[i] = rgElems[i];
break;
default:
break;
}
}
SafeArrayUnaccessData(sa);
SafeArrayUnaccessData(saTypes);
EXCEPINFO excep;
UINT uArgErr;
hr = pdisp->Invoke(dispid,IID_NULL,LOCALE_SYSTEM_DEFAULT,DISPATCH_METHOD,&dispparams,pval,&excep,&uArgErr);
}
else
{
EXCEPINFO excep;
UINT uArgErr;
hr = pdisp->Invoke(dispid,IID_NULL,LOCALE_SYSTEM_DEFAULT,DISPATCH_METHOD,&dispparams,pval,&excep,&uArgErr);
}
//release com
CoUninitialize();
return hr;
}
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I think you lost me just a little. dispparams are the parameters you're passing in. The resulting data from calling the function is in pval, not dispparams unless I'm missing something? I can help with a little more detail and a couple examples. While I try to NEVER have to go through this like you are (I love smart pointers) I've certainly had to do it enough times.
Matt
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