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Hi,
I'm trying to fire an even from an C++ ActiveX that has a "by reference" parameter:
dispinterface _IMyEvents
[id(4)] void ButtonClicked(IMyProperty * prop, [in, out, ref] VARIANT_BOOL * bDataChanged);
However, the Fire_Event proxy code generated by the wizard complains about the byref value:
pvars[0] = bDataChanged;
it's just a warning (short * truncated to bool), but it clearly indicates it doesn#t work as intended (CComVariant does not support reference values).
So - anything I can do?
The only alternatives I see are:
- write the fire_xxx wrapper myself (yuck!!!)
- provide a COM object with a "SetModified" flag instead (seems overkill)
- hack CComVariant into accepting a VARIANT_BOOL * as BYREF value (yuck yuck)
(The mechanism I need is similar to IPropertyNotifySink, but I want to support VB clients, so I can't work with S_OK / S_FALSE return value)
Pandoras Gift #44: Hope. The one that keeps you on suffering.
aber.. "Wie gesagt, der Scheiss is' Therapie"
boost your code || Fold With Us! || sighist | doxygen
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ALOK
I WANT TO CONVERT BACK A BSTR FILE TO A STRING FILE. IS IT POSSIBLE to CONVERT BSTR TO WIDE CHARACTER AND THEN (USING WideCharToMultiByte )TO CHARACTER
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There are many ways to convert BSTR TO STRING , here i am mentioning TWO!
1.wcstombs(...)
2.using String Conversion Macro LIKE W2T,T2BSTR....., but you have to enable String Conversion Macro by using USES_CONVERSION; macro
yeah you can use
WideCharToMultiByte, but this api always confuse me lot! 
[Vote One Here, Complete my Survey....]
Alok Gupta
visit me at http://www.thisisalok.tk
"I Think Believe this Will Help"
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BSTR AND WIDECHARACETR(UNICODE) R SAME.
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Buddy!
BSTR and Wide Character has almost same format for character representation. so you can use wcstombs or string conversion macro stated above!! to convert them from wide character to multibyte character string, just try!!!
or if you are using MFC , CString expose some function for BSTR tooo,like CString::SetSysString , CString::AllocSysString
[Vote One Here, Complete my Survey....]
Alok Gupta
visit me at http://www.thisisalok.tk
"I Think Believe this Will Help"
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Please don't shout! My ears hurt. 
/ravi
My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com
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BSTR is just a WORD string (16 bits for each value).
if the BSTR contains 0 (zero), you can not convert it to CString because CString can not contain zero.
if not, do this way:
//assume length of BSTR is iNum
//cs is CString, bstr is BSTR
for(i=0;i<iNum;i++)
{
cs+=(char)bstr[i];
}
very easy
includeh10
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I am using the Following code :
When i call it first time to copy data , then i paste it in any MS word or Excel it works , On Second time when i copy the data the Program Crashes At the statment :
/////pData->SetClipboard();
CopyData()
{
CDC* dcRef = GetDC();
tagSTGMEDIUM * data;
data = new tagSTGMEDIUM;
CMetaFileDC * dcMeta;
dcMeta = new CMetaFileDC();
if(!dcMeta)
{
AfxMessageBox("Unable to Load data on Clipboard");
return;
}
COleDataSource* pData = new COleDataSource;
//replace "ImageName" with a description of this image
dcMeta->CreateEnhanced(dcRef, NULL, NULL,"Cca-Graph" );
dcMeta->SetMapMode(MM_TEXT);
dcMeta->SetAttribDC(dcRef->m_hAttribDC);
//actually draw to the device context
CRect rcWnd;
GetClientRect(&rcWnd);
//draw meta file :: do what ever you want to do: bitmaps, lines, text...
DrawChart(dcMeta, rcWnd, false);
//done drawing
data->tymed = TYMED_ENHMF;
data->hEnhMetaFile = dcMeta->CloseEnhanced();
pData->CacheData( CF_ENHMETAFILE, data );
////////////// Crashes Here when called Second time //////////////////////
pData->SetClipboard();
// Release the meta file attributes
dcMeta->ReleaseAttribDC();
delete dcMeta;
delete data;
}
Regards.
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So have you stepped into the SetClipboard() call to see why it is crashing?
zahid_ash wrote:
COleDataSource* pData = new COleDataSource;
Where is the corresponding delete?
I don't see much error checking. Are all calls to new successful?
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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It is showing Access Violation in OLE32.DLL
What the problm is it ?
thanx
Regards.
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zahid_ash wrote:
It is showing Access Violation in OLE32.DLL
Are you saying that it crashes before going into the SetClipboard() method, or that it crashes while inside it?
zahid_ash wrote:
What the problm is it ?
At this point it could be any number of things. Not enough information is known yet.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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It Crashes While going in side the SetClipboard() ;
thanx
Regards.
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What about the other two questions I asked?
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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Sorry i not Read your this question in hurry
COleDataSource* pData = new COleDataSource;
Where is the corresponding delete?
new is successfull.
Its am not deleting it ? Where should i delete it in the above code.
thanx
Regards.
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zahid_ash wrote:
new is successfull.
But there is no guarantee that it will be. If it fails, any attempt to dereference pData will result in some sort of crash.
zahid_ash wrote:
Where should i delete it in the above code.
After it is no longer needed.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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Is PData is required till we paste the image some where.
or We can delete it as we copy the image .
As i am doing i Copy the image and then paste it to MS Word .
and then come back again and then As i copy the Image again it Crashes down .
So where I should Delete it / I m not sure where it is no longer needed .
As i found no clue about it on MSDN on ClipBoard topic. they not mentioned where to delete it .
thanx
Regards.
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zahid_ash wrote:
So where I should Delete it / I m not sure where it is no longer needed .
A variable is no longer needed after it is no longer used. That has the makings of a tongue twister, but think about it slowly and it will make sense.
After you have used pData for the last time, its memory can be freed.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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How does one remove tool settings programmatically?
I have added the following tool setting:
var CLTool = config.Tools('VCCLCompilerTool');
CLTool.PreprocessorDefinitions = "_CONSOLE";
now how do I remove it other than by manipulating the string?:
var strValue = CLTool.PreprocessorDefinitions;
and now removing the substring - '_CONSOLE' from strValue.
I was thinking of using |= or &=.
I am the handsome one in the crowd.
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laugh:i am using Hooking concept in my application for capturing all the mouse events around the system and sending that message to tts machine to speak out. Now i am posed one problem.i am using Insert + a keys to execute one function but if i press insert + a it's also spelling out insert key name. How to avoid this problem
Thanking you..
E.Veera Raghavendra
E.Veera Raghavendra
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this function does the job when the keys are pressed while the application is on focus. maybe this will give you an idea. you can do something similar on the application side, within the function, which catches your hooking messages from the hooking dll.
BOOL CMyDialog::PreTranslate(MSG *pMsg)
{
if(pMsg->message==WM_KEYDOWN)
{
if(pMsg->wParam==VK_ESCAPE)
return TRUE;
elsif (GetAsyncKeyState(VK_INSERT) < 0 && (pMsg->wParam=='A'))
return TRUE;
}
return CDialog::PreTranslateMessage(pMsg);
}
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I recently had a look at the windows media format sdk 9 and tried to write a simple audio player using the sdk. Currently I met trouble in playing more than one audio files. I modified the AudioPlay example by rewritting it using mfc. Currently when I handle WMT_EOF in the OnStatus method to open another audio file. The program hangs and could not open the audio file. Any suggestions? Thanks.
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Hello,
If I create a new project in MFC and work with it. its ok.
But if I close is and try to open the project and try to build I get this error;
fatal error C1853: 'Release/Test.pch' is not a precompiled header file created with this compiler
And Its stand on: #include "stdafx.h"
What I have try;
1) Delite all the files in the Debug and Release folder.
2) Clean and rebuild all
Byt I still get this error. Is it possible to make it work. And way does it work at the first time I start working with the project and not after?.
There is in 2 *.cpp files I get this error at the same file.
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Go in the menu Projects | Settings and then search in it to see Precompiled header files and choose not use the precompiled header files... I'm not sure where this option and I can't tell you cause I'm not home and I can't access VS but try that I remember it is somewhere in that menu for sure.
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Well,
I cant find it. Can you please come back to me when you are at home and can see it.
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This is the text I have and I need to make a compile without using this!
/nologo /MT /W3 /GX /O2 /I "../Shared" /I "../Zlib" /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /Fp"Release/Test.pch" /YX"stdafx.h" /Fo"Release/" /Fd"Release/" /FD /c
Like you can see the file /Fp"Release/Test.pch" /YX"stdafx.h"
I need to compile without use this swithes. And how can I do that.?
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