Link problems with static library

Link problems with static library

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An application is generating the following errors:

1>MSVCRTD.lib(MSVCR90D.dll) : error LNK2005: _malloc already defined in libcmtd.lib(dbgmalloc.obj)
1>MSVCRTD.lib(MSVCR90D.dll) : error LNK2005: _free already defined in libcmtd.lib(dbgfree.obj)
1>MSVCRTD.lib(MSVCR90D.dll) : error LNK2005: __endthreadex already defined in libcmtd.lib(threadex.obj)
1>MSVCRTD.lib(MSVCR90D.dll) : error LNK2005: __beginthreadex already defined in libcmtd.lib(threadex.obj)
1>MSVCRTD.lib(MSVCR90D.dll) : error LNK2005: _fprintf already defined in libcmtd.lib(fprintf.obj)
1>LINK : warning LNK4098: defaultlib 'MSVCRTD' conflicts with use of other libs; use /NODEFAULTLIB:library
1>.\Debug/MyApp.exe : fatal error LNK1169: one or more multiply defined symbols found

Q148652 explains the problem and ways to solve it.

I found that I was linking a static library that was compiled with the C/C++…Code Generation…Runtime Library option set to Multi-threaded Debug DLL (/MDd).

My application was using Multi-threaded Debug (/MTd).

The problem went away once I created a version of the static library that was compiled using Multi-threaded Debug (/Mtd) to match the application.

Adding items to the Send To context menu

Adding items to the Send To context menu

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Right-drag the application icon or application shortcut icon from the start menu to your desktop and choose "Create shortcut here" from the menu that  displays when you release the right mouse button.  Rename the shortcut as appropriate.

In Vista, paste the following into a Windows Explorer addressbar:

%APPDATA%\Microsoft\Windows\SendTo

Move the shortcut you recreated to the SendTo folder you just opened up.

How to enjoy Home Videos

How to enjoy Home Videos

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I recently cut up and edited 3 1/2 hours of video shot in 2000-2001.  This includes Kristen’s birth and some of the cutest footage of the kids when they were young.

My goal was to create small clips that can be viewed one at a time or in a playlist.  This has the best chance of friend and family being interested in watching.  So much of what ends up at home  is LONG footage where only a fraction is actually viewable outside of the immediate family.

My second goal was for the final files to be viewable on Windows, Mac, and an  XBOX.  I would like to able to  browse and play video in our Living room  on our HDTV which has an XBOX hooked up to it.

I”m struggling to find just the right settings/format/codec to use that will  result in good  quality and not take up tons  of space.  I had captured the original footage from  tape using a USB capture device and software which created a 7Gig MPEG-PS file.  For now, I am exporting to MPEG2 which appears to be the best balance of quality size and compatibilty.  However my XBOX360 can’t stream MPEG2 for some reason so I’ve also been exporting to MPEG4.  This streams on my XBOX but is highly compressed and not very good quality

I use Sony Vegas to cut up and create individual clips.  I export to MainConcept MPEG-2.

Jeff describes his setup to playback Blu-ray from his HD.

Converting video for your video iPod

Debugging LoadModule

Debugging LoadModule

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I just finished spending a couple days troubleshooting a problem with a Win32 non-mfc DLL failing a LoadLibrary().  Actually, the post build step for my DLL ran regsvr32 to register it and it started failing with the following message:

Regsvr32Failure

RegSvr32.exe calls the following Win32 functions in this order:

  • OleInitialize
  • LoadLibrary to load the DLL
  • DllRegisterServer or DllUnregisterServer
  • FreeLibrary
  • OleUninitialize

A common reason for failure is that there are dependent DLL's missing.  Dependency Walker is good for checking this.  Unfortunately, this lead me down a rat hole when I saw that there was a complaint about MSVCR90D.dll.  It also led me to erroneously try various things to modify the manifest used and the Code Generation…Library Used settings. 

I was unable to break in the DLLMain of the library so I assumed there was a problem in the way I was building  it.  I even installed the latest Vista SP1 and Visual  Studio SP1 to try to make the "build" problem go away.

Ultimately,  what worked was for me to create a simple program that called LoadLibrary() on my dll.  I then set the  Debug…Exceptions options to catch all  exceptions.  As soon as the test program called  LoadLibrary() (on my debug build) it went right to the  line of  code that was causing an "Invalid access to  memory",  just like the message said!  I guess that's the danger of giving too much information in a message, users will  erroneously choose the wrong symptom.

This worked because the problem  was in some  code that was called during the construction of a C++ object, which was instantiated prior to calling the main entry point of the DLL.

Lesson learned:  When a module fails on startup,  check your global  objects' construction code, and don't forget to turn on catching all exceptions in the debugger!

Implementing right-click context menu in Cocoa as a function call

Implementing right-click context menu in Cocoa as a function call

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I was porting some Windows code to Cocoa that used a synchronous call to TrackMenuPopup (TPM_RETURNCMD | TPM_NONOTIFY) to display a context menu and immediately return the menu item selected.  I didn't want the menu to post a notification because that would require a more complicated architecture that could port between Mac and Windows.  I posted the question titled "Is there an equivalent technique in Cocoa for the synchronous TrackPopupMenu in Windows?" to stackoverflow.com. 

I couldn't decouple the NSMenu notification to an NSView so I came up with a solution using a dummy NSView.  This way I could implement a popup menu as a function call that returns the selected value.  Apparently popUpContextMenu is synchronous:

I ultimately came up with the following solution:

// Dummy View class used to receive Menu Events

@interface DVFBaseView : NSView
{
    NSMenuItem* nsMenuItem;
}
– (void) OnMenuSelection:(id)sender;
– (NSMenuItem*)MenuItem;
@end

@implementation DVFBaseView
– (NSMenuItem*)MenuItem
{
    return nsMenuItem;
}
– (void)OnMenuSelection:(id)sender
{
    nsMenuItem = sender;
}
@end

// Calling Code:

void HandleRButtonDown (NSPoint pt)
{
    NSRect    graphicsRect;  // contains an origin, width, height
    graphicsRect = NSMakeRect(200, 200, 50, 100);
    //—————————–
    // Create Menu and Dummy View
    //—————————–
    nsMenu = [[[NSMenu alloc] initWithTitle:@"Contextual Menu"] autorelease];
    nsView = [[[DVFBaseView alloc] initWithFrame:graphicsRect] autorelease];

    NSMenuItem* item = [nsMenu addItemWithTitle:@"Menu Item# 1" action:@selector(OnMenuSelection:) keyEquivalent:@""];
    [item setTag:ID_FIRST];

    item = [nsMenu addItemWithTitle:@"Menu Item #2" action:@selector(OnMenuSelection:) keyEquivalent:@""];
    [item setTag:ID_SECOND];

    //———————————————————————————————
    // Providing a valid windowNumber is key in getting the Menu to display in the proper location
    //———————————————————————————————
    int windowNumber = [(NSWindow*)myWindow windowNumber];
    NSRect frame = [(NSWindow*)myWindow frame];
   
    NSPoint wp = {pt.x, frame.size.height – pt.y};  // Origin in lower left
    NSEvent* event = [NSEvent otherEventWithType:NSApplicationDefined
                        location:wp
                        modifierFlags:NSApplicationDefined
                        timestamp: (NSTimeInterval) 0
                        windowNumber: windowNumber
                        context: [NSGraphicsContext currentContext]
                        subtype:0
                        data1: 0
            &#016
0;           data2: 0];   

    [NSMenu popUpContextMenu:nsMenu withEvent:event forView:nsView];
    NSMenuItem* MenuItem = [nsView MenuItem];
   
    switch ([MenuItem tag])
    {
    case ID_FIRST: HandleFirstCommand(); break;
    case ID_SECOND: HandleSecondCommand(); break;
    } 
}
Connecting to Mac File Sharing from Vista PC

Connecting to Mac File Sharing from Vista PC

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I've been befuddled by Vista, unable to connect to my MacBook Pro from my Vista laptop.  I could always connect from the MacBook to my Vista laptop, though.  Connection issues has been a source of pain for me ever since I started using Vista.

I searched and came across this tip that solved all my problems!  Thanks Matt!

  1. “Click Windows Visa Start Orb
  2. In search box, type “regedit” and return
  3. Once regedit opens, click File -> export to make a backup copy
  4. Navigate to Computer HKEYLOCALMACHINE SYSTEM CurrentControlSet Control Lsa.
  5. In the right pane, right-click the “LmCompatibilityLevel” key and select “modify”
  6. Change the value from 3 to 1
  7. Exit regedit and you should now be able to properly authenticate to your Mac OS X (or other Samba) share.”
Accountability

Accountability

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Dog Needs by George Jartos

Ellie, our Jack Russell, has already been vetted.  I had no desire to own a dog but I was fighting a losing battle with Jane and the three kids.  I threw out the obvious arguments: "it's a big responsibility", "who will take care of her?", "who will pick up after her?".  Of course they ALL said they would.  I finally told Jane I would leave the decision to her because I knew the kids would not be responsible enough to care for her and it would ultimately fall on her.  I help out a little but not that much.  I want everyone to understand and feel the consequences of their decision.

Cassidy this year has asked to get ANOTHER dog.  I've said no (just like I did the first time), knowing that if it came down to 4 against 1 again, I would lose that battle as well.  This time I asked Cassidy, if she has ever gone a full week where she has taken Ellie for a daily walk.  I asked her if she has cleaned up after her regularly?  Has she cleaned up her barf and bathed her when she has rolled around in poop?  Of course the answer is no.  Since she has not had to feel the true consequences of owning a dog, of course she is eager to get another.

Mark Cuban wrote a post this week titled "Stock Market Meltdowns – Why they will happen again and again and again ".  

I'm a firm believer in accountability.  As long as folks don't have to feel the consequences of their actions, bad and risky decisions that have a big upside and no downside, will continue to be made.

Interestingly,  Jane hasn't suggested that a second dog is a good idea.