C / C++ / MFC

23-Oct-02 7:18

I am trying to capture a bitmap or an icon from a .bmp or .ico file selected by a user from a standard CFileDialog dialog.

LoadImage() always fails (returns 0 and hBitmap or hIcon are NULL). Cry | :((

//Code snipet<br />
   CString strAppPath;<br />
   CSString strImagesDirectory;<br />
   CString pathName;<br />
   CString fileName;<br />
   CString extName;<br />
   HICON hIcon;<br />
   HBITMAP hBitmap;<br />
	<br />
   //launch a pick file dialog<br />
   CFileDialog dlg(TRUE, NULL, NULL, OFN_HIDEREADONLY, "Bitmap(*.BMP)|*.BMP|Icon(*.ico) <br />
                   *.ico||", this);<br />
   if( dlg.DoModal() == IDOK )<br />
   {<br />
      pathName = dlg.GetPathName();<br />
      fileName = dlg.GetFileTitle();<br />
      extName = dlg.GetFileExt();<br />
<br />
      if (extName == "ico" || extName == "ICO")<br />
      {		<br />
          hIcon = (HICON)::LoadImage( NULL, pathName, IMAGE_ICON, 0, 0,   <br />
                                      LR_LOADFROMFILE|LR_DEFAULTCOLOR ); <br />
          if (hIcon)<br />
             SetIcon(hIcon, TRUE);<br />
      }<br />
      else<br />
      {<br />
         hBitmap = (HBITMAP)::LoadImage( NULL, "C:\\HAPPY.BMP", IMAGE_BITMAP, 0, 0, <br />
                                         LR_LOADFROMFILE|LR_CREATEDIBSECTION);<br />
         if (hBitmap)<br />
            bmpImage->Attach(hBitmap);<br />
      }<br />
	<br />
      //some more interesting code here...<br />
}

I have tried a number of things with the second parameter of the LoadImage() call -- hard coded path to the file, path as captured by the CFileDialog, image files in the root directory and located in a variety of other locations (including the directory of the working project). Nothing works. I have searched the documentation and what I have should work.

I am working on Windows 2000 Professional and in Visual Studio .NET but in unmanaged C++ code.

Anyone have any idea whta I am doing wrong? Confused | :confused:

Sydney Liles
Software Engineer

Stephane Rodriguez.23-Oct-02 7:49

Stephane Rodriguez.

23-Oct-02 7:49

The first parameter should be the instance of your module. Passing NULL instead is only for OEM images.

How low can you go ?
(MS rant)

Sydney Liles23-Oct-02 8:16

23-Oct-02 8:16

This is one of the things I have tried. I tried it again after I got your response. No luck. Unsure | :~

I changed the code to look like this:

//launch a pick file dialog<br />
CFileDialog dlg(TRUE, NULL, NULL, OFN_HIDEREADONLY, "Bitmap(*.BMP)|*.BMP|Icon(*.ico)<br />
                |*.ico||", this);<br />
if( dlg.DoModal() == IDOK )<br />
{<br />
   pathName = dlg.GetPathName();<br />
   BYTE FileBuffer[10240] = "";<br />
   fileName = dlg.GetFileTitle();<br />
   extName = dlg.GetFileExt();<br />
<br />
   HINSTANCE hInst = AfxGetInstanceHandle();<br />
<br />
   if (extName == "ico" || extName == "ICO")<br />
   {		<br />
      hIcon = (HICON)::LoadImage(hInst, pathName, IMAGE_ICON, 0, 0, <br />
                                 LR_LOADFROMFILE|LR_DEFAULTCOLOR); <br />
      if (hIcon)<br />
	SetIcon(hIcon, TRUE);<br />
   }<br />
   else<br />
   {<br />
      hBitmap=(HBITMAP)::LoadImage(hInst, "C:\\HAPPY.BMP", IMAGE_BITMAP, 0, 0, <br />
                                   LR_LOADFROMFILE|LR_CREATEDIBSECTION);<br />
      if (hBitmap)<br />
	bmpImage->Attach(hBitmap);<br />
   }<br />
	<br />
   //some more interesting code here...<br />
}

I know I am getting a valid HINSTANCE.

Any other suggestions?

BTW -- I really do appreciate the help.

Sydney Liles
Software Engineer

Stephane Rodriguez.23-Oct-02 8:27

Stephane Rodriguez.

23-Oct-02 8:27

Code from MSDN[^].

How low can you go ?
(MS rant)

Sydney Liles23-Oct-02 8:43

23-Oct-02 8:43

Boy, I sound like my children (no, that won't work) Eek! | :eek:

I did try that -- This is one of the documents I found that discusses LoadImage(). The problem remains the same. When I add this code to my own, then the LoadImage() call in the LoadBitmapFromBMPFile() fails.

BOOL LoadBitmapFromBMPFile( LPTSTR szFileName, HBITMAP *phBitmap,<br />
   HPALETTE *phPalette )<br />
   {<br />
<br />
   BITMAP  bm;<br />
<br />
   *phBitmap = NULL;<br />
   *phPalette = NULL;<br />
<br />
   // Use LoadImage() to get the image loaded into a DIBSection<br />
   <big>*phBitmap = (HBITMAP)LoadImage( NULL, szFileName, IMAGE_BITMAP, 0, 0,<br />
               LR_CREATEDIBSECTION | LR_DEFAULTSIZE | LR_LOADFROMFILE );</big> <br />
  if( *phBitmap == NULL )<br />
     return FALSE;<br />

I think there is something going on with LoadImage() itself. I thought that the .bmp files I was using to test might be the problem because they are very old and have not been updated. I got a .bmp with lots more information stored in the properties and it does not work either.

The only thing I can think of is that LoadImage() fails on Win2K. I read a Microsoft Knowledge Base article to this effect http://support.microsoft.com/default.aspx?scid=kb;en-us;Q329092. I do not have access to a Win9x machine with Visual Studio installed to test this theory.

Thanks though.

Sydney Liles
Software Engineer

Paul M Watt23-Oct-02 9:49

Paul M Watt

23-Oct-02 9:49

What does GetLastError return after you call this function and it fails?

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Sydney Liles23-Oct-02 9:56

Linker error, I messed up with my SDK directory

23-Oct-02 9:56

Funny you should ask. Big Grin | :-D

I just added a call to GetLastError() a few minutes ago and realized that I had created a CFile (to get size information), opened it, read the contents of the .bmp into a buffer(in an attempt to get LoadImage() to work) and then closed it after I attempted to call LoadImage() -- GetLastError() returned 32 (ERROR_SHARING_VIOLATION). I moved the CFile::Close() to before the call to LoadImage() and now all is well.

It was a dumb thing to over look. Wish I had tried the GetLastError() sooner. Dead | X|

Oh well.

Thanks for all of the help.

Sydney Liles
Software Engineer

User 665823-Oct-02 7:10

User 6658

23-Oct-02 7:10

Hi
the last few weeks I modified some files in my Platform-SDK directory, resulting in linker errors and missing files Roll eyes | :rolleyes:

Now I have uninstalled the latest Platform SDK completely and reinstalled it again, but I still keep getting this error (German):

C:\PROGRAMME\MICROSOFT SDK\LIB\LIBC.lib : fatal error LNK1112: Computer-Typ "IA64" fuer Modul steht in Konflikt mit dem Ziel-Computer-Typ "IX86"

This seems to me to be a conflict between 32bit and 64bit libraries. My project is build for 32bit platforms.
But the first library path the compiler should use is defined as C:\PROGRAMME\MICROSOFT SDK\LIB\, that's why I don't know how the error can occur.

thanks in advance
Greg

modified 12-Sep-18 21:01pm.

Re: Linker error, I messed up with my SDK directory

Stephane Rodriguez.23-Oct-02 7:50

Stephane Rodriguez.

23-Oct-02 7:50

Try to find this path in the registry, and modify it or kill it.

How low can you go ?
(MS rant)

Re: Linker error, I messed up with my SDK directory

User 665823-Oct-02 8:56

User 6658

23-Oct-02 8:56

I did both, but nothing helped Frown | :(

modified 12-Sep-18 21:01pm.

string

wong190723-Oct-02 7:02

wong1907

23-Oct-02 7:02

Hello,

I want to ask how to store a String in 2-D array foramt?

e.g.
abc[0][0]="A";
abc[0][1]="AA";
abc[0][2]="AAA";
......
....
..
abc[n][n]="AAAAAAAAAAAAAAA";

THX!!!
I am not using MFC, just the console mode!!!
I think it for a long time!!!

Re: string

Alvaro Mendez23-Oct-02 11:34

Alvaro Mendez

23-Oct-02 11:34

If your 2-D array will simply hold literal strings, like in your example, declare it as a 2-D array of pointers to characters, like this:

char* abc[N][N];

This assumes N is a predefined constant value.

Regards,
Alvaro

Insanity: doing the same thing over and over again and expecting different results. - Albert Einstein

Safe file padding?

clintsinger23-Oct-02 5:51

clintsinger

23-Oct-02 5:51

I am developing for a Windows CE device in which there is a bug where files that are divisble by 2048 aren't copiable from the permanent storage to the volatile storage. At this moment I have been just checking to see if the exe's and dll's are divisible by 2048 and if so add some characters to the end of the file. Is this a safe practice or should I be doing something else.

I have tried putting an int padding[] = {0, 1,..., etc} in the file but it seems the file doesn't change in size; which, I could only assume is the optimizing compiler removing it.

Cheers,
Clint

Re: Safe file padding?

Daniel Turini23-Oct-02 5:55

Daniel Turini

23-Oct-02 5:55

I'm sure that there is a linker setting for this, but I can't remember it at all...

And, for the padding, for the compiler optimizer do not remove it, try do something, like reading all the array in a for loop...

Q261186 - Computer Randomly Plays Classical Music

Accessing Internet through Proxy using Winsock

Ph@ntom23-Oct-02 5:46

Ph@ntom

23-Oct-02 5:46

I was trying to get Googles webpage by using Winsock. But the real problem is I am behind Firewall (Microsoft ISA). As far as the Winsock is concerned getting webpage within the Firewalll is not difficult. But when I try to access behind the Firewall the Server won't allow me anymore.

Please anyone can help regarding how can I access a webserver behind firewall by using Winsock. How can I use or implement Proxy support in my program. Frown | :(

Dammy More

Re: Accessing Internet through Proxy using Winsock

pjnaughter23-Oct-02 9:23

pjnaughter

23-Oct-02 9:23

You should check out the relavent RFC on supporting a HTTP Proxy. For an example of winsock programming which works thro a HTTP proxy, check out my CDDB class at http://www.naughter.com/mfccddb.html

sndPlay freakin' Sound

Jh323-Oct-02 4:19

Jh3

23-Oct-02 4:19

hi
it's my third time posting this question in as many days! I wrote my own wave file, but when i want to play it with sndPlaySound, i only get a beep from the PC speaker. Other applications play the file fine, and other wave files are played with the sndPlaySound function in my app.
WHAT'S WRONG?

PLEASE!! Mad | :mad:

Re: sndPlay freakin' Sound

Matt Philmon23-Oct-02 4:26

Matt Philmon

23-Oct-02 4:26

Send me the file and the snippet of code that plays it.

system command using MFC

achandra00723-Oct-02 4:18

achandra007

23-Oct-02 4:18

Is there a system type command in MFC? Or do I have to use system to launch another application from within my application?

Thanks
ashish

Simon.W23-Oct-02 4:34

Simon.W

23-Oct-02 4:34

Try ShellExecute

I am seeking...
For what?
Why did you ask me for what? I don't know!

pjnaughter23-Oct-02 4:34

pjnaughter

23-Oct-02 4:34

CreateProcess, WinExec, ShellExecute or ShellExecuteEx spring to mind. All documented in the MSDN

Ravi Bhavnani23-Oct-02 7:18

Ravi Bhavnani

23-Oct-02 7:18

Nice to see you on the VC++ forum, PJN!

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com