Re: Bmp to jpg convertion - C / C++ / MFC Discussion Boards

ns8-Apr-03 4:01

8-Apr-03 4:01

Thanks.

In my pretranslatemsg, i trap enter for a text box. If I dont like the user entry I return right away. If I accept it, then I go ahead and move my selection in an adjacent listctrl ahead by one ....using SetItemState(++m_index..)

WIth this happening ,in this function your lock-unlock works great.

However I also have the case where the user puts in a bad entry in the textbox and tries to advance to a new selection in the listbox. OnItem runs of course. In this I check to see if I like the entry . If I dont I want to force the selection to remain where it is, not move the one I just clicked on. Again I do SetItemState....this time in OnItemChanged. However now the unlock-lock trick doesnt work because oddly , after it goes through the first two times,

lock
setItem runs onitem
unlock
runs onitem and returns as it should

onitem runs yet again! but my flags all restored so it goes through all over again.
Thanks for the help again,

it then does another pair.............probably because it was trying to go to the new one and I forced it back or something.

ns

Re: OnItemChanged runs several times!

Mike Upton8-Apr-03 4:27

Mike Upton

8-Apr-03 4:27

Have you tried handling LVN_ITEMCHANGING instead, and returning FALSE to prevent the change (see MSDN for LVN_ITEMCHANGING). I haven't tried this myself, so I don't know if it works.

Your other option is to keep track of the currently selected item in a member variable, and only processing the ItemChanged notification if it's trying to select a different item to the one you think is currently selected.

YourClass::OnItemChanged(NMHDR* pNMHDR, LRESULT* pResult)
{
    NMLISTVIEW* pNMLV = reinterpret_cast<NMLISTVIEW*>(pNMHDR);
    //assuming you're only interested in the new selection, so check
    //whether the LVIS_SELECTED state is set
    if (!(pNMLV->uNewState & LVIS_SELECTED)) return;
 
    //Make sure m_CurrentSelection is initialised in the constructor to
    //an invalid value like -1, so that this works for the first selection.
 
    //This checks that we're not just resetting the selection back to the 
    //current one.
    if (pNMLV->iItem == m_CurrentSelection) return;
  
    if (whatever_condition_your_checking_is_okay)
    {
        //allow the new selection
        m_CurrentSelection = pNMLV->iItem;        
    }
    else
    {
        //go back to the old selection
        m_List.SetItemState(m_CurrentSelection, LVIS_SELECTED, LVIS_SELECTED);
    }
}

N.B. Untested code - it's just an example of what I mean.

"We are the knights who say Ni" _{(The Knights Who Say Ni)}

RAS AutoDial Settings problem

Mark Otway8-Apr-03 1:00

Mark Otway

8-Apr-03 1:00

I'm trying to configure my own GUI for an AutoDial RAS entry, in a similar method to the RasJazz[^] sample in the MSDN. I'm using RasSetEntryProperties to set the autodial DLL and autodial function, and have built a suitable RAS autodial DLL with both ASCII and Unicode exported functions. But it doesn't work. Frown | :(

For some reason, calling RasSetEntryProperties seems to corrupt the dial-up entry, altering the options so that a phonebook entry which previously didn't prompt at all now prompts for the phone number. And regardless of this, the autodial function never seems to get called in my DLL. Confused | :confused:

Anyone got a working example of this stuff?!? I've even tried compiling the

FYI, here's my code to set up the phone book entry for my autodial DLL....

DWORD dwEntrySize = sizeof( RASENTRY );<br />
RASENTRY entry;<br />
ZeroMemory( &entry, dwEntrySize );<br />
entry.dwSize = dwEntrySize;<br />
<br />
DWORD dwRet = RasGetEntryProperties( NULL, sDialEntryName, <br />
                        &entry, &dwEntrySize, NULL, NULL);<br />
<br />
if( !dwRet )<br />
{<br />
    if( bAddAutoDial )<br />
    {<br />
        // Set the path to this DLL and the function name<br />
        strcpy( entry.szAutodialDll, sDLLPath );<br />
        strcpy( entry.szAutodialFunc, "ISPIAutoDialHandler" );<br />
    }<br />
    else<br />
    {<br />
        entry.szAutodialDll[0] = NULL;<br />
        entry.szAutodialFunc[0] = NULL;<br />
    }<br />
<br />
    dwRet = RasSetEntryProperties( NULL, sDialEntryName, <br />
                             &entry, entry.dwSize, NULL, 0);<br />
<br />
    if( ! dwRet )<br />
        bRet = TRUE;<br />
}

________________________
http://www.webreaper.net

Bmp to jpg convertion

Mahesh Varma8-Apr-03 0:49

Mahesh Varma

8-Apr-03 0:49

Hi all,

I want to convert a bmp file to jpg. How to do this in visual c++.
Is there any free libs ?

Thanks in advance

Mahesh Varma

Re: Bmp to jpg convertion

Anonymous8-Apr-03 1:40

Anonymous

8-Apr-03 1:40

Hi

Here you got all code you need:

http://www.codeproject.com/bitmap/cximage.asp

Daniel

Re: Bmp to jpg convertion

C^hris L^osinger8-Apr-03 1:42

C^hris L^osinger

8-Apr-03 1:42

Mahesh Varma wrote:
Is there any free libs ?

there are probably ten different libs here on code project. try looking around a little bit.

-c

Image tools: ThumbNailer, Bobber, TIFFAssembler

Re: Bmp to jpg convertion

Dudi Avramov8-Apr-03 1:54

Dudi Avramov

8-Apr-03 1:54

Use GDI+ .
Take a sample from MSDN: "Setting JPEG Compression Level"

C++

#include <windows.h>
#include <gdiplus.h>
#include <stdio.h>
using namespace Gdiplus;

INT GetEncoderClsid(const WCHAR* format, CLSID* pClsid);  // helper function

INT main()
{
   // Initialize GDI+.
   GdiplusStartupInput gdiplusStartupInput;
   ULONG_PTR gdiplusToken;
   GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

   CLSID             encoderClsid;
   EncoderParameters encoderParameters;
   ULONG             quality;
   Status            stat;

   // Get an image from the disk.
   Image* image = new Image(L"Shapes.bmp");

   // Get the CLSID of the JPEG encoder.
   GetEncoderClsid(L"image/jpeg", &encoderClsid);

   // Before we call Image::Save, we must initialize an
   // EncoderParameters object. The EncoderParameters object
   // has an array of EncoderParameter objects. In this
   // case, there is only one EncoderParameter object in the array.
   // The one EncoderParameter object has an array of values.
   // In this case, there is only one value (of type ULONG)
   // in the array. We will let this value vary from 0 to 100.

   encoderParameters.Count = 1;
   encoderParameters.Parameter[0].Guid = EncoderQuality;
   encoderParameters.Parameter[0].Type = EncoderParameterValueTypeLong;
   encoderParameters.Parameter[0].NumberOfValues = 1;

   // Save the image as a JPEG with quality level 0.
   quality = 0;
   encoderParameters.Parameter[0].Value = &quality;
   stat = image->Save(L"Shapes001.jpg", &encoderClsid, &encoderParameters);

   if(stat == Ok)
      wprintf(L"%s saved successfully.\n", L"Shapes001.jpg");
   else
      wprintf(L"%d  Attempt to save %s failed.\n", stat, L"Shapes001.jpg");

   // Save the image as a JPEG with quality level 50.
   quality = 50;
   encoderParameters.Parameter[0].Value = &quality;
   stat = image->Save(L"Shapes050.jpg", &encoderClsid, &encoderParameters);

   if(stat == Ok)
      wprintf(L"%s saved successfully.\n", L"Shapes050.jpg");
   else
      wprintf(L"%d  Attempt to save %s failed.\n", stat, L"Shapes050.jpg");

      // Save the image as a JPEG with quality level 100.
   quality = 100;
   encoderParameters.Parameter[0].Value = &quality;
   stat = image->Save(L"Shapes100.jpg", &encoderClsid, &encoderParameters);

   if(stat == Ok)
      wprintf(L"%s saved successfully.\n", L"Shapes100.jpg");
   else
      wprintf(L"%d  Attempt to save %s failed.\n", stat, L"Shapes100.jpg");

   delete image;
   GdiplusShutdown(gdiplusToken);
   return 0;
}

Re: Bmp to jpg convertion

RaajaOfSelf9-Apr-03 13:08

RaajaOfSelf

9-Apr-03 13:08

If you are using VC++ .NET ,then use CImage class

List exported function in DLL

AnTri8-Apr-03 0:22

AnTri

8-Apr-03 0:22

How can I list all exported functions in a dll like "dependency walker" from Microsoft...

Re: List exported function in DLL

vmaltsev8-Apr-03 5:06

vmaltsev

8-Apr-03 5:06

Hail AnTri,

You can use dumpbin.exe. It has a lot of options.
To see all exports use dumpbin /exports <file.dll>

Regards.

Re: List exported function in DLL

AnTri8-Apr-03 11:04

AnTri

8-Apr-03 11:04

Thank you, but you misunderstand me.
I need a function in my Application that list's all exported function from a selected dll.

Re: List exported function in DLL

Dudi Avramov8-Apr-03 23:04

Dudi Avramov

8-Apr-03 23:04

Download from MSDN the sample PEDump in article "Peering Inside the PE: A Tour of the Win32 Portable Executable File Format".

However, the function DumpExportsSection doesn't work since it looks for
the section ".edata" which sometimes is contained in ".rdata" section.
Therefore i put some changes according to other sample.

Add the following at the beginning of EXEDump.c :

#define GetImgDirEntryRVA( pNTHdr, IDE ) \
	(pNTHdr->OptionalHeader.DataDirectory[IDE].VirtualAddress)

#define GetImgDirEntrySize( pNTHdr, IDE ) \
	(pNTHdr->OptionalHeader.DataDirectory[IDE].Size)

PIMAGE_SECTION_HEADER GetEnclosingSectionHeader(DWORD rva, PIMAGE_NT_HEADERS pNTHeader) 
{
    PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(pNTHeader);
    unsigned i;
    
    for ( i=0; i < pNTHeader->FileHeader.NumberOfSections; i++, section++ )
    {
		// This 3 line idiocy is because Watcom's linker actually sets the
		// Misc.VirtualSize field to 0.  (!!! - Retards....!!!)
		DWORD size = section->Misc.VirtualSize;
		if ( 0 == size )
			size = section->SizeOfRawData;
			
        // Is the RVA within this section?
        if ( (rva >= section->VirtualAddress) && 
             (rva < (section->VirtualAddress + size)))
            return section;
    }
    
    return 0;
}

LPVOID GetPtrFromRVA( DWORD rva, PIMAGE_NT_HEADERS pNTHeader, PBYTE imageBase )
{
	PIMAGE_SECTION_HEADER pSectionHdr;
	INT delta;
		
	pSectionHdr = GetEnclosingSectionHeader( rva, pNTHeader );
	if ( !pSectionHdr )
		return 0;

	delta = (INT)(pSectionHdr->VirtualAddress-pSectionHdr->PointerToRawData);
	return (PVOID) ( imageBase + rva - delta );
}

Replace the function DumpExportsSection with the new one:

void DumpExportsSection(DWORD base, PIMAGE_NT_HEADERS pNTHeader)
{
	PIMAGE_EXPORT_DIRECTORY exportDir;
	PIMAGE_SECTION_HEADER header;
	INT delta; 
	PSTR filename;
	DWORD i;
	PDWORD functions;
	PWORD ordinals;
	PSTR *name;

	DWORD exportsStartRVA, exportsEndRVA;
    
	exportsStartRVA = GetImgDirEntryRVA(pNTHeader,IMAGE_DIRECTORY_ENTRY_EXPORT);
	exportsEndRVA = exportsStartRVA +
	   				GetImgDirEntrySize(pNTHeader, IMAGE_DIRECTORY_ENTRY_EXPORT);

	
	// Get the IMAGE_SECTION_HEADER that contains the exports.  This is
	// usually the .edata section, but doesn't have to be.
	header = GetEnclosingSectionHeader( exportsStartRVA, pNTHeader );
	if ( !header )
		return;

	delta = (INT)(header->VirtualAddress - header->PointerToRawData);
	exportDir = (PIMAGE_EXPORT_DIRECTORY)GetPtrFromRVA(exportsStartRVA, pNTHeader, base);

	/*
	header = GetSectionHeader(".edata", pNTHeader);
	if ( !header )
		return;
	exportDir = MakePtr(PIMAGE_EXPORT_DIRECTORY, base,
						 header->PointerToRawData);
	delta = (INT)(header->VirtualAddress - header->PointerToRawData);
	*/

	filename = (PSTR)(exportDir->Name - delta + base);
		
 	printf("exports table:\n\n");
	printf("  Name:            %s\n", filename);
	printf("  Characteristics: %08X\n", exportDir->Characteristics);
	printf("  TimeDateStamp:   %08X\n", exportDir->TimeDateStamp);
	printf("  Version:         %u.%02u\n", exportDir->MajorVersion,
			exportDir->MajorVersion);
	printf("  Ordinal base:    %08X\n", exportDir->Base);
	printf("  # of functions:  %08X\n", exportDir->NumberOfFunctions);
	printf("  # of Names:      %08X\n", exportDir->NumberOfNames);
	
	functions = (PDWORD)((DWORD)exportDir->AddressOfFunctions - delta + base);
	ordinals = (PWORD)((DWORD)exportDir->AddressOfNameOrdinals - delta + base);
	name = (PSTR *)((DWORD)exportDir->AddressOfNames - delta + base);

	printf("\n  Entry Pt  Ordn  Name\n");
	for ( i=0; i < exportDir->NumberOfNames; i++ )
	{
		printf("  %08X  %4u  %s\n", *functions,
				*ordinals + exportDir->Base,
				(*name - delta + base));
		name++;			// Bump each pointer to the next array element
		ordinals++;
		functions++;
	}
}

Anyway, if you want me to email you the full sample then send me your
e-mail.

Dudi

CListView

rosen7-Apr-03 23:59

rosen

7-Apr-03 23:59

Hello.
i have a little problem.
I have an SDI project. Left pano is CListView and right is CFormView.
It is about the CListView. It uses a standart CListCtrl class which is not very usefull for me. SO i found a source
of extended CListCtrl --> XListCtrl. This is a good class, BUT i dont know how to replace a standart CListCtrl
in the CListView with this XListCtrl.
Any ideas.
Thank you in advance.

Re: CListView

jhwurmbach8-Apr-03 0:16

jhwurmbach

8-Apr-03 0:16

Make the ListView pane a class derived from CFormView, with the XListCtrl on it occupying the whole space, growing and shrinking with the pane.
For this, have your View handle WM_SIZE and SetWindow() your XListCtrl to the size of the pane.

My opinions may have changed, but not the fact that I am right.

context mneu question

Jump_Around7-Apr-03 23:50

Jump_Around

7-Apr-03 23:50

How to change a text on a submenu item??

This is how I enableMenuItem and it works but how to chege the text on it???

UINT ID = ::GetMenuItemID(pSubMenu->m_hMenu,0);
::EnableMenuItem(pSubMenu->m_hMenu,ID,0);

Re: context mneu question

Brian Shifrin8-Apr-03 1:15

Brian Shifrin

8-Apr-03 1:15

ModifyMenu

Brian

Re: context mneu question

Cedric Moonen8-Apr-03 1:19

Cedric Moonen

8-Apr-03 1:19

Take a look at the documentation for the CMenu class. You can use for several purpose (also if you want to change the text).

You can use the ModifyItem function.
Suppose the ID of the menu item you want to change the text is ID_YOURID and the menu is ID_YOURMENU. Use the following code:

CMenu* pNewMenu = new CMenu();<br />
pNewMenu->LoadMenu(ID_YOURMENU);<br />
pNewMenu->ModifyMenu(ID_YOURID,MF_BYCOMMAND|MF_STRING,ID_YOURID,"Your Text");<br />

Call then TpNewMenu->TrackPopupMenu(...) to show the menu!

Hope this helps!

Unzipping?

Brian Delahunty7-Apr-03 23:09

Brian Delahunty

7-Apr-03 23:09

Does anybody know of a library for unzipping files other than the article here on CP [nothing wrong with that one] but I'm just wondering.

Regards,
Brian Dela Smile | :)

Re: Unzipping?

jhwurmbach7-Apr-03 23:27

jhwurmbach

7-Apr-03 23:27

zLib[^]is THE one and only standard!

My opinions may have changed, but not the fact that I am right.

ScrollWindow

jeremysay7-Apr-03 23:04

jeremysay

7-Apr-03 23:04

hello,
I use Scroll window to scroll a view in child window.
how to "ScrollTo(0,0)", i want to reposition my view.
i have already use SetWindowPos(0,0,0,0,0,SWP_NOSIZE), but it seems doesn't work.
thx in advance

Re: ScrollWindow

Brian Shifrin8-Apr-03 1:20

Brian Shifrin

8-Apr-03 1:20

SetScrollPos

Re: ScrollWindow

jeremysay8-Apr-03 2:06

jeremysay

8-Apr-03 2:06

thx but i work with CHtmlView and i can't use SetScrollPos without error Frown | :(

another idea ?
thx again

Re: ScrollWindow

Brian Shifrin8-Apr-03 13:48

Brian Shifrin

8-Apr-03 13:48

CHtmlView ...

BOOL CMyHtmlView::ScrollTop(
LPDISPATCH pdispDoc, // The HTML document to scroll
BOOL bScrollTop) // TRUE=top;FALSE=bottom
{
CComQIPtr<ihtmldocument2>piDoc(pdispDoc);
CComPtr<ihtmlwindow2>piWindow;

return (piDoc && SUCCEEDED(piDoc->get_parentWindow(
&piWindow)) && piWindow && SUCCEEDED(piWindow->scroll(
0, (bScroll) ? LONG_MIN : LONG_MAX)));
}

Re: ScrollWindow

jeremysay9-Apr-03 3:21

jeremysay

9-Apr-03 3:21

thx for your help Smile | :)

but i don't want to use the scrollbar of CHtmlView, there are a lot of problem with there (i can't control scrollbar with some web site). I search a function like "ScrollTo(X,Y)" but it seems it doesn't exist Cry | :((

thank you nevertheless

Hook problem

_Theo_7-Apr-03 22:24

_Theo_

7-Apr-03 22:24

Hi
I'm using hooks to subclass menus so I can draw them myself. This works pretty good on Windows XP, but on 98 and 2000 it only seems to work once. When I have two different programs using the new style menus I can start up one of them over and over again without problems. But as soon as I click on a menu in another app using the menus it crashes. It only happens with a menu attached to a window. When using TrackPopupMenu it always seems to work. Any suggestions?

Thanks

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