C / C++ / MFC

9-Nov-05 8:38

See:

http://www.ganttchart.com/

http://associate.com/gantt/

http://office.microsoft.com/en-us/assistance/HA010346051033.aspx

"Take only what you need and leave the land as you found it." - Native American Proverb

CString concatenation

Kharfax9-Nov-05 6:31

Kharfax

9-Nov-05 6:31

Hi
Im actually coding using VC++ with Visual Studio .NET 2003
When i was using VC6, i could do

CString a = "abc";
CString b = "123";

a += b;

and then a would be "abc123".

But now, i dont know what happens, but a ends up being "123"

this is driving me crazy.

The solution i found is doing

strcat(a.GetBuffer(), b.GetBuffer());

But that sucks.

Any suggestions??

Maximilien9-Nov-05 6:47

Maximilien

9-Nov-05 6:47

it works well on my version of VS.net 2003 ...

maybe there is something else that you overlook.

Maximilien Lincourt
Your Head A Splode - Strong Bad

RChin9-Nov-05 6:50

RChin

9-Nov-05 6:50

I can't see anything wrong with the sample code you provided. In fact, I just did a simple test and it works as it should Confused | :confused:

The only difference I know of between VS6 and VS7.1 is that the MFC CString class in MFC7 is templated. But the functionalities are the same.

I Dream of Absolute Zero

Kharfax9-Nov-05 6:55

Kharfax

9-Nov-05 6:55

I deleted the whole method and did it again, and now seems to be working fine...
Is strange because isn't the first time something like this happens to me.

Thanks for the suggestions Big Grin | :-D

Loss of "Called by"-functionality

James R. Twine9-Nov-05 6:57

James R. Twine

9-Nov-05 6:57

Kharfax wrote:
strcat(a.GetBuffer(), b.GetBuffer());

   Never do that!

   What you are doing is appending to a string's internal buffer when you have no idea what that buffer's valid (usable) length is. For example, if a's internal buffer was 6 characters long, your call to strcat(...) would exceed the length of the buffer and would write the terminating NUL character off of the end of the allocated memory.

   While your problem sounds odd, I would make sure no one accidently #defined "+=" to be "=" (I have seen it done before, do not ask why). You could also test by adding up to ints in the same way and see if they total correctly.

   Peace!

-=- James

If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Tip for new SUV drivers: Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
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Polly Parrot9-Nov-05 5:02

Polly Parrot

9-Nov-05 5:02

This one drives me up the walls...

I frequently use the "Called by"-feature, available from the drop down occuring when right-clicking a function symbol in the Class View.

Now, for no apparent reason, this has stopped working!

I have tried deleting all of the files in the Debug-folder, deleting the ncb file, checking that the Build Browse Info box is checked in the project settings and then re-compiling. All to no avail.

Selecting "Called by" for any function renders... nothing. Not even an error message!

Any clues, people! Thanx in advance for any tips on this one!

------------------------------------------------------------
"Pooollyyy!! ...Polly Parrot! Wakey-wakey!"

Java problem in hosted IE view...

James R. Twine9-Nov-05 4:08

James R. Twine

9-Nov-05 4:08

   A coworker has experienced an interesting problem that involves Java applets when used in a hosted IE situation. I have been able to recreate the issue by using an AppWizard-generated CHTMLView application (with no other code changes made).

   The applets seem to load and function correctly; they draw and respond to mouse actions as expected. However, one of the applets contains an action button that submits a form or otherwise transmits data back to the server (the data fields are part of the Java applet's UI), that causes a popup to be generated that confirms the details specified on the form.

   When using this series of applets in IE, everything works fine. However, when using them in the hosted browser, some data is not making it back to the server and the generated popup is corrupted (invalid/missing data).

   The applets are on a 3-rd party site and we do not have direct access to them for debugging purposes -- so I cannot determine if the Applet is generating the popup directly, or it comes from the server, or a combination of both.

   I expect that the Java applet itself is trying to send data back to the server but something is blocking this data when it is hosted.

   I have Googled (both the web and Usenet) for information but I have come up empty.

   Has anyone seen a problem like this before? Or do they have an idea of what is going on? I am at a loss here...

   Peace!

-=- James

VC6.0 and VS.NET co-existence question

prcarp9-Nov-05 3:20

prcarp

9-Nov-05 3:20

I have both Visual Studio 6.0 and .NET (2003) versions installed on my PC. I am running an application (compiled for debug but not running under the debugger) and it throws an exception. The OS picks .NET as the debugger but I would like it to pick VC++6.0 as the debugger. Where is this setting?

Re: VC6.0 and VS.NET co-existence question

John M. Drescher9-Nov-05 3:58

John M. Drescher

9-Nov-05 3:58

I am not sure of the setting but I would say that I have installed .net 2003 just to debug my vc6 applications with the .net debugger. As is a lot better than the one with vc6 especially if you want to do remote debugging. One way to use the .net debugger is to load your project with it .net and let it upgrade to .net then exit. It will create a .sln and .vcproj for .net to load, don't worry it will not trash your .dsp or .dsw files so you still can compile and develop with vc6. I do this all the time.

John

GDI+: Image Save returned Invalid Parameter

raed9-Nov-05 3:13

raed

9-Nov-05 3:13

I'm in case that function returned for me JPEG file data in CString.
so I write the CString data to IStream Object and then save the file but I'm
getting InvalidParameter , i do not know why? here is code snippet

Write(CString image, int len)
{

CLSID encoderClsid;
GetEncoderClsid(L"image/jpeg", &encoderClsid);
LPBYTE lpBits = (LPBYTE) GlobalAlloc(GMEM_MOVEABLE, len);
IStream *pStream;
HRESULT res = ::CreateStreamOnHGlobal(lpBits,FALSE,&pStream);
LPTSTR sImage = image.GetBuffer(len);
pStream->Write(sImage,sizeof(sImage),NULL);
LARGE_INTEGER li;
li.QuadPart = 0;
res = pStream->Seek(li,STREAM_SEEK_SET,NULL);
if(SUCCEEDED(res))
{
Image *jpgImage = Image::FromStream(pStream);
jpgImage->Save(L"C:\\myImage.jpg",&encoderClsid,NULL);
//here Save return InvalidParameter , WHY? any suggestions?
}

}

Menu items grayed out?

Jesper Knudsen9-Nov-05 2:44

9-Nov-05 2:44

All items are grayed out, why?

void CMyFrameWnd::OnRButtonUp(UINT nFlags, CPoint p) 
{
   CMenu menu;
   menu.CreatePopupMenu();
   menu.AppendMenu( MF_STRING | MF_ENABLED , 700 , "Zoom All" );
   menu.AppendMenu( MF_STRING | MF_ENABLED , 701 , "Properties" );
   ClientToScreen(&p);
   menu.TrackPopupMenu(TPM_CENTERALIGN,p.x,p.y,this,NULL);
   CFrameWnd::OnRButtonUp(nFlags, point);
}

David Crow9-Nov-05 3:05

9-Nov-05 3:05

Do you have a handler function for menu items 700 and 701?

"Take only what you need and leave the land as you found it." - Native American Proverb

Jesper Knudsen9-Nov-05 3:25

9-Nov-05 3:25

No I am overriding OnCommand()

For CWnd's this seems to be enough - maybe for CFrameWnd's it's not enough?

David Crow9-Nov-05 3:36

9-Nov-05 3:36

MFC's framework will disable menu items for which a handler has not been provided. There is no way for it to know that you are handling menu item requests from within OnCommand().

"Take only what you need and leave the land as you found it." - Native American Proverb

Jesper Knudsen9-Nov-05 3:55

9-Nov-05 3:55

So I shouldn't override OnCommand(), instead I should create a handler?

ON_COMMAND_RANGE( 700 , 701 , OnMenuCommand )

afx_msg void OnMenuCommand ( UINT nID )

I just wonder - why is OnCommand() virtual then?

John M. Drescher9-Nov-05 4:10

John M. Drescher

9-Nov-05 4:10

You can add onupdatecmdui handlers for each id and then use oncmommand, I do this a lot.

John

David Crow9-Nov-05 4:13

9-Nov-05 4:13

Jesper Knudsen wrote:
So I shouldn't override OnCommand(), instead I should create a handler?

That's how I would proceed.

Jesper Knudsen wrote:
I just wonder - why is OnCommand() virtual then?

It has its purpose. My most recent use of it was on a property sheet. I needed to handle the clicking of the OK button.

"Take only what you need and leave the land as you found it." - Native American Proverb

Jesper Knudsen9-Nov-05 4:12

9-Nov-05 4:12

Thank you for your help, it works with the handler - still I wonder, still I wonder..

Smile | :)

David Crow9-Nov-05 5:36