Drawing rotated WMF - C / C++ / MFC Discussion Boards

How to convert HDC to Color Bitmap?
I used from "CreateCompatibleBitmap" but output bitmap was monochromatic.

The "hDC" must have the image already? you can use the provide function to do that!

HBITMAP GetBitmapFromDC(HDC hDC, int x, int y, int nWidth, int nHeight, bool bCopyToClipboard /* = false */)
{
	HDC  hMemDC = ::CreateCompatibleDC( hDC );
	HBITMAP hImage = ::CreateCompatibleBitmap( hDC, nWidth, nHeight );
	HBITMAP hOldBitmap = (HBITMAP) ::SelectObject( hMemDC, hImage );

	// Copy DC - Actual image is "hDC"
	::BitBlt(hMemDC, 0, 0, nWidth, nHeight, hDC, x, y, SRCCOPY);

	// Copy Image to Clipboard
	if (bCopyToClipboard)
	{
		::OpenClipboard( AfxGetMainWnd() );
		::EmptyClipboard();
		::SetClipboardData(CF_BITMAP, hImage);
		::CloseClipboard();
	}

	::SelectObject( hOldBitmap);
	::DeleteDC( hMemDC );
	return hImage;
}

Good luck!

"One good thing about getting older, you don't lose the ages you've been!"

I have a bmp handle that gave it from open dialog.
How can I resize it and show in listview by normal size. Confused | :confused:

Did you try CreateCompatibleBitmap ?
Just a thought

I'm including MSHTML into my class definition like this :

#include <comdef.h>
#include <mshtml.h>
#pragma warning(disable : 4192)
#pragma warning(disable : 4049)
#pragma warning(disable : 4146)
#import <mshtml.tlb> no_auto_exclude

The problem is, that when i modify my .cpp file, compiler throws these errors :

.....manualdlg.cpp(18) : fatal error C1083: Cannot open compiler generated file: '.........\debug\mshtml.tlh': Permission denied
Error executing cl.exe.
Creating browse info file...
BSCMAKE: error BK1506 : cannot open file '.\Debug\ManualDlg.sbr': No such file or directory

But when i try to run compile again, it will finish without any errors, until i modify my .cpp again. So i always have to compile two times. Does anybody have some idea how to solve this, please ? (i'm using VC++ 6.0 SP2).
Thanks

It so happens that VC++ generates mshtml.tlh everytime you type a character is .cpp file. i don't know why but it happens like that. So turn off intellisense, this would fix the problem.

I turned off all checkboxes in Tools->Options->Editor in 'statement completion options' area, but it has no effect

I wrote the following functions to draw rotated (0, 90, 180 and 270 degrees) WMF. It almost works, the rotation itself seems to be correct, but the translation is not. I get WMF which is properly rotated, but it is placed in the wrong place.
Note, this function must work under NT 4.0/2000/XP.

What is the reason of this problem?

long G_lHeightWmf = 0, G_lWidthWmf = 0;

static int CALLBACK WMFEnumCallback(HDC hdc,HANDLETABLE *lpHTable,METARECORD *pmfr, int nObj,LPARAM lparam)
{
long width = 0,height = 0;

hdc;lpHTable;nObj;lparam;
if(pmfr->rdFunction==META_SETWINDOWEXT)
{
width=abs((SHORT)pmfr->rdParm[1]);
if(width>G_lWidthWmf)
G_lWidthWmf=width;
height=abs((SHORT)pmfr->rdParm[0]);
if(height>G_lHeightWmf)
G_lHeightWmf=height;
}
return TRUE;
}

void GetSizeWMF(HDC A_hDC,HMETAFILE A_hMetaFile,long *A_pWidth,long *A_pHeight)
{
if(A_hMetaFile!=NULL)
{
G_lWidthWmf=0;
G_lHeightWmf=0;
EnumMetaFile(A_hDC,A_hMetaFile,WMFEnumCallback,0); // <--to calcule size wmf
*A_pWidth=G_lWidthWmf;
*A_pHeight=G_lHeightWmf;
}
}

void DrawWMF(HDC A_hDC,RECT *A_pRect,HMETAFILE A_Hmf, bool A_bDrawRotated/* = false*/)
{
POINT ptRect[2], ptSize[2] = {0};
SIZE sizeViewNew, sizeViewNewLP;
int nSavedDC;
BOOL bOK = TRUE;
XFORM XForm, XFormSaved;
int nGraphMode = 0;
float fPixelXPermm(0.f), fPixelYPermm(0.f);
float fScaleXY(1.f), fScaleYX(1.f);
CRect rcNormal(A_pRect->left, A_pRect->top, A_pRect->right, A_pRect->bottom);
long dx = 0, dy = 0;

rcNormal.NormalizeRect();

if(A_pRect != NULL && A_Hmf != NULL)
{
rcNormal.SetRect(A_pRect->left, A_pRect->top, A_pRect->right, A_pRect->bottom);
rcNormal.NormalizeRect();

if(GetDeviceCaps(A_hDC,TECHNOLOGY)!=DT_METAFILE)
{
fPixelXPermm = GetDeviceCaps(A_hDC,LOGPIXELSX)/MMPERINCH;
fPixelYPermm = GetDeviceCaps(A_hDC,LOGPIXELSY)/MMPERINCH;
}
else
{
HDC hScreenDC = GetDC(NULL);
fPixelXPermm = GetDeviceCaps(hScreenDC,LOGPIXELSX)/MMPERINCH;
fPixelYPermm = GetDeviceCaps(hScreenDC,LOGPIXELSY)/MMPERINCH;
ReleaseDC(NULL, hScreenDC);
}
ptRect[0].x = rcNormal.left;
ptRect[0].y = rcNormal.top;
ptRect[1].x = rcNormal.right;
ptRect[1].y = rcNormal.bottom;

bOK = LPtoDP(A_hDC, ptRect, 2);
sizeViewNew.cx = abs(ptRect[1].x - ptRect[0].x);
sizeViewNew.cy = abs(ptRect[1].y - ptRect[0].y);
ptSize[1].x = sizeViewNew.cx;
DPtoLP(A_hDC, ptSize, 2);
sizeViewNewLP.cx = abs(ptSize[1].x-ptSize[0].x);
ptSize[0].x = 0;
ptSize[0].y = 0;
ptSize[1].x = 0;
ptSize[1].y = sizeViewNew.cy;
DPtoLP(A_hDC, ptSize, 2);
sizeViewNewLP.cy = abs(ptSize[1].y-ptSize[0].y);

if(bOK && sizeViewNew.cx > 0 && sizeViewNew.cy > 0)
{
fScaleXY = float(sizeViewNew.cx)/sizeViewNew.cy;
fScaleYX = float(sizeViewNew.cy)/sizeViewNew.cx;
nSavedDC = SaveDC(A_hDC);
SetMapMode(A_hDC, MM_ANISOTROPIC);
SetViewportOrgEx(A_hDC, ptRect[0].x, ptRect[0].y, NULL);
SetViewportExtEx(A_hDC, sizeViewNew.cx, sizeViewNew.cy, NULL);

GetSizeWMF(A_hDC, A_Hmf, &dx, &dy);
float sYX = (float)dy/(float)dx;
float sXY = (float)dx/(float)dy;

if(A_bDrawRotated)
{
GetWorldTransform(A_hDC, &XFormSaved);
nGraphMode = GetGraphicsMode(A_hDC);
SetGraphicsMode(A_hDC, GM_ADVANCED);

switch(TGraphicFilesSettings::GetCurrentRotationAngle())
{
case 270:
{
SetViewportOrgEx(A_hDC, ptRect[1].x, ptRect[0].y, NULL);
XForm.eM11 = 0;
XForm.eM12 = sYX;
XForm.eM21 = -sXY;
XForm.eM22 = 0;
XForm.eDx = 0;
XForm.eDy = 0;
break;
}
case 180:
{
SetViewportOrgEx(A_hDC, ptRect[1].x, ptRect[1].y, NULL);
XForm.eM11 = - 1;
XForm.eM12 = 0;
XForm.eM21 = 0;
XForm.eM22 = - 1;
XForm.eDx = 0;
XForm.eDy = 0;
}
break;
case 90:
{
SetViewportOrgEx(A_hDC, ptRect[0].x, ptRect[1].y, NULL);
XForm.eM11 = 0;
XForm.eM12 = -sYX;
XForm.eM21 = sXY;
XForm.eM22 = 0;
XForm.eDx = 0;
XForm.eDy = 0;
}
break;
}
ModifyWorldTransform(A_hDC, NULL, MWT_IDENTITY);
SetWorldTransform(A_hDC, &XForm);
}
PlayMetaFile(A_hDC, A_Hmf);
RestoreDC(A_hDC, nSavedDC);

if(A_bDrawRotated)
{
SetWorldTransform(A_hDC, &XFormSaved);
ModifyWorldTransform(A_hDC, NULL, MWT_IDENTITY);
SetGraphicsMode(A_hDC, nGraphMode);
}
}
}
}

Confused | :confused:

I have a class call CFileDog, it is derivered from CNALABase which uses a template member to store data to a file.

But whenever i run the program it crashes, i worked out that it wirks when CFileDog is used as a global, but inside a class or function it crashes,

Con anyone help.

Thanks

Without more info, it is hard to say what your problem is. A little code'd help a lot (definitions of the classes involved, crashing code, tc.)

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Is the class going out of scope whilst you are still trying to call its functions or access its data.

Michael Smile | :)

hi all,

i want to clarify my mind that the memory addressing for diff. process and thread.
as i know the pointer in diff. process is not the same. each process has its own local memory addressing. so, it need shared memory to communicate.
how about diff. thread in same process? do they share the same local memory address?
i feel it is true as i can access static array inside a thread. but, all thread can only access static memory of a object, why?

pls try to keep me some idea!

thanks,
chaze

zecodela wrote:
how about diff. thread in same process? do they share the same local memory address?

Yes, all threads in a process have access to the data in the process space.

--Mike--
Just released - RightClick-Encrypt - Adds fast & easy file encryption to Explorer
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Sonork - 100.10414 AcidHelm

You are getting the picture.

Processes have differnet address space, meaning a pointer cannot go out current process space. Even if you obtain an address of an object from a diffrent process, trying to access it will give you an access violation.

Threads share the same address space, but have different "stack space". This means that a global object can be accessed/modified by two threads at the same time so you must protect it with semaphores, critical sections etc. However if two threads are executing the same function at the same time the local variables declared in that function will be "different".

Best regards,
Alexandru Savescu

hello 2 of you!!!
i want to learn more.
what is the meaning of 'stack space'? what will it affect?
and, how about 'static'? why all thread function can only access static member of its own class? (but, if i used PostMessage() posting a pointer of a local variable inside the thread function, outside can still access these local variable)
what is the use of 'static' in this case?

thanks thanks...!!!
chaze

zecodela wrote:
what is the meaning of 'stack space'? what will it affect?

Suppose you have a function like this

int f (int y)
{
 int x = y;
 return x;
}

And then you create two threads that call function f at the same time but with different values: (i.e the first one calls f(1) and the second calls f (2)). In this case the local x will have different values accross the different threads. This is what I meant with 'stack space'.

zecodela wrote:
why all thread function can only access static member of its own class?
I am not sure what you mean. Do you refere to thread created by AfxBeginThread or with threads derived from CWinThread?
Also you can use PostMessage to send pointers to different objects across threds.

Best regards,
Alexandru Savescu

yes, i refer to AfxBeginThread. why does the thread create by it can only access static member of the class create it? any special reason? i feel it make multi-thread not so elegant in MFC.

pls give some idea!
thanks,
chaze

Hi everyone. In a program I am writing, I need to check which version of some system dlls are installed, for example. mfc42.dll, comctrl.dll, and a few others. I know there is a few ways of doing this, but what would be the "best" way to do this so that it will be compatible with future versions of Windows, and requires the least amount of overhead? Thanks in advance for any help!

See April 98 C++ Q&A in MSDN
Q How can I tell which version of a particular module (DLL) is installed on my system? I am trying to figure out which version of comctl32.dll is installed. I have seen code that calls GetProcAddress to try getting various functions like InitCommonControlsEx to determine the version based on which functions are present. This seems kludgy to me. What is the right way to get the version?
A Well, there are two ways: the easy way and the hard way. The easy way is to call a special new entry DllGetVersion. The only problem is, while comctl32.dll supports this function, not all DLLs have it. If there's no DllGetVersion, you have to use the hard way—namely, the FileVersion API, which is perhaps one of the most confusing APIs you will ever come across.............. (see MSDN)

this is my dilemma I have never done C++ before and I have a class assignment due in one week, can you help me with the code. If you email me I will give you my problem. Please help me
Confused | :confused:

What do you need to know ? Do you know how to use cin/cout ? Do you expect people to email you instead of answering through the site ? Why did you remove the problem ?

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

And you don't spend much time with the opposite sex working day and night, unless the pizza delivery person happens to be young, cute, single and female. I can assure you, I've consumed more than a programmer's allotment of pizza, and these conditions have never aligned. - Christopher Duncan - 18/04/2002

No cin or cin out... problem was so long... if you email me i can give you problem...

C++ Virgin

You don't know how to use cin and cout ?

You know, if we discuss it here, other people might offer advice also. It will all be in the form 'look this up/try this', but I'm sure we're all happy to help you to help yourself.

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

And you don't spend much time with the opposite sex working day and night, unless the pizza delivery person happens to be young, cute, single and female. I can assure you, I've consumed more than a programmer's allotment of pizza, and these conditions have never aligned. - Christopher Duncan - 18/04/2002

Christian,
not sure how to get started. I know a wee bit of UNIX from a 3 week class and no C++. The assignment seems so hard for a first assignment.

C++ Virgin