C / C++ / MFC

23-Jul-10 0:23

Message Removed

Cedric Moonen23-Jul-10 0:46

Cedric Moonen

23-Jul-10 0:46

If you are using LoadLibrary, you don't need to link to any library.
Where does this dll come from ?

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

viduran23-Jul-10 0:51

23-Jul-10 0:51

I have created this dll and trying to call them.

First i got this error

"Error 1 error C2664: 'GetProcAddressW' : cannot convert parameter 2 from 'const char [6]' to 'LPCWSTR' c:\Users\Indumathi\Documents\Visual Studio 2005\Projects\Win32 DLL\Win32 DLL\NestedDLL.cpp 33"

To overcome this i added
_AddFunc = (AddFunc1)GetProcAddress(hInstLibrary,Text("MyDLL"));

After adding this Text command in GetProcAddress I got this error

<b>"Error 1 error LNK2019: unresolved external symbol "public: __cdecl std::exception::exception(char const *)" (??0exception@std@@QAA@PBD@Z) referenced in function "public: __cdecl std::bad_alloc::bad_alloc(char const *)" (??0bad_alloc@std@@QAA@PBD@Z) NestedDLL.obj ">
</b>

To solve this i added .lib file in the Additional Library in Linker tab
Once did that all the error went and i got this error

"Fatal error LNK 1180 cannot open input file"

I am new to VC++ and i have no idea how to solve this.
pls. help me to solve this.

Cedric Moonen23-Jul-10 0:57

Cedric Moonen

23-Jul-10 0:57

Ok, so either you link to your library and call the functions direclty, or you use LoadLibrary and GetProcAddress. But it doesn't make any sense to link to your library and use LoadLibrary. I strongly suggest you read some tutorials about dlls (there are plenty of articles available on CP).

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

viduran23-Jul-10 1:04

23-Jul-10 1:04

Is there an article for wince win32 dll.
Because I found many links and all for win32 projects and for smart device in VC++.If so, can u please give me the link.
.It would be grateful if send me the link

Rajesh R Subramanian23-Jul-10 6:02

Rajesh R Subramanian

23-Jul-10 6:02

induvijay wrote:
"Error 1 error C2664: 'GetProcAddressW' : cannot convert parameter 2 from 'const char [6]' to 'LPCWSTR' c:\Users\Indumathi\Documents\Visual Studio 2005\Projects\Win32 DLL\Win32 DLL\NestedDLL.cpp 33"

This is because you're either explicitly calling GetProcAddressW (which is not the best way of doing it) or your project is Unicode. In either case, you're using char, but you should be using wchar_t for the call to succeed. Or do an ANSI build, which would call GetProcAddressA.

It's time for a new sig. Seriously.

Richard MacCutchan23-Jul-10 0:49

Richard MacCutchan

23-Jul-10 0:49

induvijay wrote:
"Error 1 fatal error LNK1181: cannot open input file 'C:\Users\Indumathi\Documents\Visual.obj'"

You should fix this problem first. What is this file and why is the linker trying to include it?

It's time for a new signature.

viduran23-Jul-10 0:52

23-Jul-10 0:52

I have no idea.even i searched in my local directory its not there.
I included my library file in the Additional Library include.once i did that this error occurs

Richard MacCutchan23-Jul-10 2:24

Richard MacCutchan

23-Jul-10 2:24

From this and your comments above it would appear that you are somewhat new to C++ or programming in general. I would suggest you spend a little more time studying the basics before trying what looks like a more advanced project.

induvijay wrote:
I included my library file in the Additional Library include.once i did that this error occurs

Obviously something in your build configuration is trying to include this file; take a look at the project properties to see where it is being called from.

It's time for a new signature.

Message Removed

23-Jul-10 2:50

23-Jul-10 2:50

Message Removed

Scrolling is not working ScrollView

Richard MacCutchan23-Jul-10 4:27

Richard MacCutchan

23-Jul-10 4:27

Here[^] is a Microsoft article that should help you.

It's time for a new signature.

Anu_Bala22-Jul-10 23:03

Anu_Bala

22-Jul-10 23:03

Hi, in my CTrendView derived from CScrollView,i added two scrollbars inside the view.
I created it in OnCreate function.

int CTrendView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CZoomView::OnCreate(lpCreateStruct) == -1)
	return -1;

HScroll.Create(SBS_HORZ|SBS_TOPALIGN|WS_CHILD|WS_VISIBLE,CRect(10,10,200,15), this, 1); //10,10,200,15
VScroll.Create(SBS_VERT|SBS_TOPALIGN|WS_CHILD|WS_VISIBLE,CRect(200,50,230,200),this, 2);
}

And i added code for OnHScroll and OVScroll also.

void CTrendView::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) 
{
	CRect r;
	CClientDC d(pScrollBar);
	HScroll.SetScrollPos(iHIndex,1);
	int TmpiHIndex	= iHIndex;							biHIndexChanged	= false;							
	if (pScrollBar == &HScroll)
	{
		if (nSBCode == SB_THUMBTRACK)
		{
		iHIndex = (int)nPos;
		}
		if (nSBCode == SB_LINEDOWN)
		{
			iHIndex++;
			if (iHIndex > pScrollBar->GetScrollLimit()) 
				iHIndex = pScrollBar->GetScrollLimit();
		}
		if (nSBCode == SB_LINEUP)
		{
			iHIndex--;
			if (iHIndex < 0) 
				iHIndex = 0;
		}
		HScroll.SetScrollPos(iHIndex,1);		
	}		
	
	CView::OnHScroll(nSBCode, nPos, pScrollBar);
}

So my problem is when i scrolling the Window scroll,its not get scrolling.When i debug,i found after pressing windows scroll it goes to this OnHSCroll coding and actual scrolling is not working.What can i do?Help me.

Anu

Re: Scrolling is not working ScrollView

Cedric Moonen22-Jul-10 23:11

Cedric Moonen

22-Jul-10 23:11

What are you doing with the iHIndex later ?
You have to take that offset into account when you redraw your view.

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

Re: Scrolling is not working ScrollView

Anu_Bala22-Jul-10 23:44

Anu_Bala

22-Jul-10 23:44

Im using iHIndex in OnDraw() function

iHIndex = HScroll.GetScrollPos();

and assinging in SCROLLINFO
SCROLLINFO infoH;
infoH.cbSize = sizeof(SCROLLINFO);
infoH.fMask = SIF_ALL;
infoH.nMin = 0;
infoH.nMax = PageCount;
infoH.nPage = 1;
infoH.nPos = iHIndex;
infoH.nTrackPos = 1;
HScroll.SetScrollInfo(&infoH);

Im plotting some dynamic values as trend in a Rect and im using this scroolbar to scroll and see the previous trend.
THis scrollbar is working properly.
Problem in Window scrollbar,when i move that it,it again move to previous position.

Anu

32 bitmap and gdi+ problem

rjkg22-Jul-10 23:01

22-Jul-10 23:01

I have a 32bit bitmap with alpha channnel . I am drawing it using gdi+ . but I am not getting the transparency . How to get the transparency usnig gdi+

Rajesh

Niklas L22-Jul-10 23:14

Niklas L

22-Jul-10 23:14

How are you drawing it? Do you have any code you can share? (small piece)

home

rjkg22-Jul-10 23:37

22-Jul-10 23:37

Graphics graphics(hdc);//Handle to the device context
//Load the image from a file
Image image(L"test.bmp",FALSE); // test.bmp is 32bit with alpha channels for transparency
graphics.DrawImage(&image,0,0,image.GetWidth(),image.GetHeight());

Rajesh

S p k 52123-Jul-10 0:28

S p k 521

23-Jul-10 0:28

You have to specify Colormatrix and load it via ImageAttributes'
SetColorMatrix() before using DrawImage()

Regards,
Spk

rjkg23-Jul-10 0:40

23-Jul-10 0:40

What will be color matrix values ???

Rajesh

Re: 32 bitmap and gdi+ problem [modified]

S p k 52123-Jul-10 0:51

S p k 521

23-Jul-10 0:51

Thats based upon your requirement... if you need to convert 80% of the bitmap alpha values use this sample one...

ColorMatrix colorMatrix = {1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
0.0f, 0.0f, 0.0f, 0.8f, 0.0f,
0.0f, 0.0f, 0.0f, 0.0f, 1.0f};

ImageAttributes imageAtt;
imageAtt.SetColorMatrix(&colorMatrix, ColorMatrixFlagsDefault,
ColorAdjustTypeBitmap);

Regards,
Spk

rjkg23-Jul-10 0:59