C / C++ / MFC

VS2005 compile error after updates

16-Jul-08 17:59

So, how do I solve this refresh problem now?

gluballs14-Jul-08 21:28

gluballs

14-Jul-08 21:28

A couple of weeks ago I enabled XP's automatic updates (it hadn't been upgraded since I installed XP SP1 a year ago). After the upgrade (XP SP2 and it also did some secuirty upgrade to my VS2005) I cannot build any of my code anymore. At first I got a bunch of errors, then I retarted my machine, at which point there was an error message on boot up that I've never seen before, immediately followed by an "automated" fix. Now when I try to recompile again it still doesn't work, but the errors are different.

------ Rebuild All started: Project: NSMAnalysis, Configuration: Release Win32 ------
Deleting intermediate and output files for project 'NSMAnalysis', configuration 'Release|Win32'
Compiling...
stdafx.cpp
C:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include\afxwin.h(2613) : error C2061: syntax error : identifier 'HDROP'
C:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include\afxwin.h(3621) : error C2061: syntax error : identifier 'HDROP'
C:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include\afxwin2.inl(70) : error C2039: 'DragAcceptFiles' : is not a member of '`global namespace''
C:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include\afxwin2.inl(70) : error C2660: 'CWnd::DragAcceptFiles' : function does not take 2 arguments
C:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include\afxwin2.inl(423) : error C2065: 'HDROP' : undeclared identifier
C:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include\afxwin2.inl(424) : error C2448: 'CWnd::OnDropFiles' : function-style initializer appears to be a function definition

I can't find where HDROP is defined but the error concerning DragAcceptFiles is strange. afxwin2.inl calls this function with 2 arguments but it's defined in afxwin.h with only one. How is this possible? Were the header files changed during the updates?? If they weren't how did it EVER work?

Thanks.

Mike
|

Re: VS2005 compile error after updates

kDevloper15-Jul-08 1:20

kDevloper

15-Jul-08 1:20

May be You have to reinstall VS2005 again. Smile | :)

Deleting the popup menu

Sunayna14-Jul-08 21:25

14-Jul-08 21:25

How do I delete the pop up menu created by default in the CEdit class?

CPallini14-Jul-08 22:13

14-Jul-08 22:13

Sunayna wrote:
the pop up menu created by default in the CEdit class?

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Sunayna14-Jul-08 22:15

14-Jul-08 22:15

yes

OK!

CPallini14-Jul-08 22:24

14-Jul-08 22:24

Rajesh R Subramanian15-Jul-08 2:17

Rajesh R Subramanian

15-Jul-08 2:17

Have you searched CP for "CEdit context menu"?

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.

Microsoft MVP - Visual C++[^]

ThatsAlok15-Jul-08 3:32

ThatsAlok

15-Jul-08 3:32

Sunayna wrote:
How do I delete the pop up menu created by default in the CEdit class?

you have to derive the class from the CEdit and handle the WM_LBUTTONDOWN message and plant your new popup menu there!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You/xml>

Problem with pageup and pagedown keys

SandipG 15-Jul-08 3:35

SandipG

15-Jul-08 3:35

ThatsAlok andle the WM_LBUTTONDOWN message

Is it right??

Regards,
Sandip.

Sunayna14-Jul-08 21:23

Re: Problem with pageup and pagedown keys

14-Jul-08 21:23

There is a MDIchild window which has the CEdit class. Initially page up and page down keys were working.On setting the virtual key codes for page up and page down, page up and page down is not working. How do I enable the functionality of Page up and page down

Nelek14-Jul-08 21:26

Nelek

14-Jul-08 21:26

What is bad in handling the OnKeyDown/OnKeyUp and calling the scroll if pressed key is PageUp/Down??

Regards.
--------
M.D.V. Wink | ;)

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
“The First Rule of Program Optimization: Don't do it. The Second Rule of Program Optimization (for experts only!): Don't do it yet.” - Michael A. Jackson
Rating helpfull answers is nice, but saying thanks can be even nicer.

Re: Problem with pageup and pagedown keys

Sunayna14-Jul-08 22:57

Re: Problem with pageup and pagedown keys

14-Jul-08 22:57

There are two tabs in my application. One is the parent and the other is the child. The parent tab is CView and the child tab is the CEdit control. Page up and page down are working for the parent but not for the child. I tried to implement ur suggestion but still page up and page down isn't working for the child.
Thanks

Nelek15-Jul-08 1:34

Nelek

15-Jul-08 1:34

Ok, in that case it is not going to work. I had the same problem and an easy solution I found (is not the best, I know it) was to declare Hot Keys with the VK_ that I wanted to check in other views. The Hot Keys are global in the app, but locally executed. For me worked. Take a look on that.

Regards.
--------
M.D.V. Wink | ;)

How to use command line arguments in a win32 application?

Sauce!14-Jul-08 21:14

Re: How to use command line arguments in a win32 application?

14-Jul-08 21:14

Hi guys,

I am trying to implement some command-line arguments for my application. I would like to be able to run the program with "Program.exe -w800 -h600" to force the resolution to be displayed at 800*600.

I've come up with this basic code that I would have thought could achieve the goal I had in mind but I get the error

error C2446: '==' : no conversion from 'const char *' to 'int' There is no context in which this conversion is possible

So lpCmdLine is a pointer to a const char, so how do I extract the information I want from it? Wouldn't it have been easier for microsoft to just implement it as an array of char's? Frown | :(

WINDOW_WIDTH and WINDOW_HEIGHT are both global integers.

// Get command-line parameters
for (int n=0; n < (sizeof(lpCmdLine) / sizeof(char)); n++)
{
    if(lpCmdLine[n] == "-" && lpCmdLine[n+1] == "w")
    {
        char w[4];
        w[0] = lpCmdLine[n+2];
        w[1] = lpCmdLine[n+3];
        w[2] = lpCmdLine[n+4];
        w[3] = lpCmdLine[n+5];
        WINDOW_WIDTH = w[];
    }

    if(lpCmdLine[n] == "-" && lpCmdLine[n+1] == "h")
    {
        char h[4];
        h[0] = lpCmdLine[n+2];
        h[1] = lpCmdLine[n+3];
        h[2] = lpCmdLine[n+4];
        h[3] = lpCmdLine[n+5];
        WINDOW_HEIGHT = h[];
    }
}

The solution probably has something to do with some hefty use of pointers Frown | :(

Cedric Moonen14-Jul-08 21:26

Cedric Moonen

14-Jul-08 21:26

You should use atoi[^] if you want to convert a string (e.g. "800") into the corresponding integer.

Cédric Moonen
Software developer

Charting control [v1.4]
OpenGL game tutorial in C++

Re: How to use command line arguments in a win32 application?

Sauce!14-Jul-08 21:36

Re: How to use command line arguments in a win32 application?

14-Jul-08 21:36

sorry but I don't think that will work for my purposes Frown | :(

I need to be able to parse the string first for any - signs followed by either a w or h. Once I get that working then I would be able to use atoi to convert the numbers in the string but I can't get to that point using atoi Frown | :(

CPallini14-Jul-08 21:41

Re: How to use command line arguments in a win32 application?

14-Jul-08 21:41

Your code has several flaws.
Try

int iLen = _tcslen(lpCmdLine);
for (int i = 0; i < iLen - 2; i++) // supposing at least a digit following -h or -w option
{
  if ( lpCmdLine[i] == _T('-'))
  {
    if (lpCmdLine[i+1] == _T('h'))
    {
      WINDOW_HEIGHT = _tstoi(&(lpCmdLine[i+2]));
    }
    else if (lpCmdLine[i+1] == _T('w'))
    {
      WINDOW_WIDTH = _tstoi(&(lpCmdLine[i+2])); 
    }
  }
}

Sauce!14-Jul-08 21:50

Re: How to use command line arguments in a win32 application?

14-Jul-08 21:50

It took me a few minutes to understand your code (had to search through all the help files for all that stuff I've never seen before)

It looks like it should work.

But it doesnt Frown | :(

error C2664: 'wcslen' : cannot convert parameter 1 from 'LPSTR' to 'const wchar_t *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
error C2664: '_wtoi' : cannot convert parameter 1 from 'CHAR *' to 'const wchar_t *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
error C2664: '_wtoi' : cannot convert parameter 1 from 'CHAR *' to 'const wchar_t *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast

And could you please give me some hints as to why my code is flawed? I was already aware there was something wrong with it, hence the reason it doesn't work.

CPallini14-Jul-08 22:00

Re: How to use command line arguments in a win32 application?

14-Jul-08 22:00

OK. These errors arise because the LPSTR nature of lpCmdLine. Use:

int iLen = strlen(lpCmdLine);
for (int i = 0; i < iLen - 2; i++) // supposing at least a digit following -h or -w option
{
  if ( lpCmdLine[i] == '-')
  {
    if (lpCmdLine[i+1] == 'h')
    {
      WINDOW_HEIGHT = atoi(&(lpCmdLine[i+2]));
    }
    else if (lpCmdLine[i+1] =='w')
    {
      WINDOW_WIDTH = atoi(&(lpCmdLine[i+2])); 
    }
  }
}

Sauce!14-Jul-08 22:21

Re: How to use command line arguments in a win32 application?

14-Jul-08 22:21

thankyou, your code works flawlessly. Big Grin | :-D

Bloody legend :P

Now, may we discuss the bad things I did in my original snippet so that I may learn from it in the future? That would be nice Smile | :)

CPallini14-Jul-08 22:38

Re: How to use command line arguments in a win32 application?

14-Jul-08 22:38

Sauce! wrote:
Now, may we discuss the bad things I did in my original snippet so that I may learn from it in the future? That would be nice

Your original code:

// Get command-line parameters
	for (int n=0; n < (sizeof(lpCmdLine) / sizeof(char)); n++)
	{
		if(lpCmdLine[n] == "-" && lpCmdLine[n+1] == "w")
		{
			char w[4];
			w[0] = lpCmdLine[n+2];
			w[1] = lpCmdLine[n+3];
			w[2] = lpCmdLine[n+4];
			w[3] = lpCmdLine[n+5];
			WINDOW_WIDTH = w[];
		}

		if(lpCmdLine[n] == "-" && lpCmdLine[n+1] == "h")
		{
			char h[4];
			h[0] = lpCmdLine[n+2];
			h[1] = lpCmdLine[n+3];
			h[2] = lpCmdLine[n+4];
			h[3] = lpCmdLine[n+5];
			WINDOW_HEIGHT = h[];
		}
	}

1. sizeof(lpCmdLine) = sizeof(LPSTR) = 4 (on 32 bit systems). You should use strlen(lpCmdLine) instead.

2. Since the code inside the loop accesses lpCmdLine[n+5], the loop itself cannot run on the whole lpCmdLine's range available.
So the loop controlling condition should be (n < strlen(lpCmdLine) - 5) to
prevent buffer overrun.

3. You wrote your own version of atoi, but it is wrong: suppose pCmdLine[0] to pCmdLine[3] containing the right input for the number, the (brute force and simplified) code for a atoi-like function may be

int value = 0;
value = pCmdLine[0]-'0'; // since pCmdLine[0] is a character 
value *= 10;
value += pCmdLine[1]-'0';
value *= 10;
value += pCmdLine[2]-'0';
value *= 10;
value += pCmdLine[3]-'0';

Sauce!15-Jul-08 2:39

Re: How to use command line arguments in a win32 application?

15-Jul-08 2:39

1) Huh, missed that one completely. Probably could have been avoided if I could find some better documentation on the exact data-type and format of lpCmdLine. Microsoft's documentation was pretty poor. Frown | :(

2) thanks, I was wondering why you subtracted 2 from iLen in your example. I thought to myself "yeah, it's technically correct, but you don't need to do it" (what a stupid thing to think!) I didn't even think about preventing buffer overrun.

3) I'm not sure what you're getting at here...

CPallini15-Jul-08 3:15

Re: How to use command line arguments in a win32 application?

15-Jul-08 3:15

Sauce! wrote:
3) I'm not sure what you're getting at here...

Well, suppose:

lpCmdLine = "-w800";

this really means

lpCmdLine[0] = '-';
lpCmdLine[1] = 'w';
lpCmdLine[2] = '8';
lpCmdLine[3] = '0';
lpCmdLine[4] = '0';

Consider lpCmdLine[2] = '8'. Here lpCmdLine[2] is a char variable holding the ASCII value of the character '8' (that is 56 decimal). If you write

int iFirstDigit = lpCmdLine[2];

then you make a mistake, because iFirstDigit will contain 56 instead of 8. On the other hand, writing

int iFirstDigit = lpCmdLine[2] - '0';

you get the expected value (in a rather portable way), since numbers are ordered in the ASCII encoding following their natural (ordinal!) sequence, hence
lpCmdLine[2] - '0' = 56 - 48 = 8.
Now, suppose you make the same for the following digits, obtaining

iFirstDigit = 8; // please note, quite different with respect '8'!
iSecondDigit = 0;
iThirdDigit = 0;

to finally build the number you have to exploint the base 10 positional numbering system, i.e. poorly speaking:

int iNumber = iFrstDigit * 100 + iSecondDigit * 10 + iThirdDigit;

I made the above in a incremental way on previously posted code.
Smile | :)

Sauce!15-Jul-08 5:51