C / C++ / MFC

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Re: how can i DRAW in CVIEW:OnInitialUpdate() function? Shog928-Dec-01 8:58 Shog9 28-Dec-01 8:58  You can draw, provided you can get a DC; // ... CClientDC dc(this); // draw stuff // ... However, there's a good chance that the window is not visible yet, so drawing into it will not be very useful. A better idea is to use the class as it was intended; initialize any data necessary for drawing in OnInitialUpdate(), updated it in OnUpdate(), and draw it in OnDraw(). OnDraw() will be called when the window is shown and first needs to be updated, so if you place your drawing code there, the view will act as desired. i ain't happy, i'm feeling glad; i got sunshine in a bag; i'm useless, but not for long; the future is coming on... gorillaz, clint eastwood Re: how can i DRAW in CVIEW:OnInitialUpdate() function? AnonymousBabe@usa.net28-Dec-01 14:23 AnonymousBabe@usa.net 28-Dec-01 14:23  i set a breakpoint in first line of the OnDraw but can not trace into the code one is the other who absorbs the thoughts of others Re: how can i DRAW in CVIEW:OnInitialUpdate() function? Shog929-Dec-01 13:14 Shog9 29-Dec-01 13:14  Not sure what you mean now... The break point isn't getting hit? i ain't happy, i'm feeling glad; i got sunshine in a bag; i'm useless, but not for long; the future is coming on... gorillaz, clint eastwood csv file Sonu Kapoor28-Dec-01 2:06 Sonu Kapoor 28-Dec-01 2:06  How to get the data of a csv file ?? regards Sonu error message 28-Dec-01 0:42 28-Dec-01 0:42  the target platform c:...xyz.dll does not match the current target platform i am getting a error when i am executing a dialog based program which uses a dll that was developed in BC45 environment what does this error mean can any one help me sudha sudha Re: error message Sergei Yevseyev28-Dec-01 4:24 Sergei Yevseyev 28-Dec-01 4:24  BC 4.5 uses BWCC.dll (16-bit one). Use Target to switch to 32-bit one OR rebuild Your broject by C++ Builder. error message 28-Dec-01 0:41 28-Dec-01 0:41  the target platform c:...xyz.dll does not match the current target platform i am getting a error when i am executing a dialog based program which uses a dll that was developed in BC45 environment what does this error mean can any one help me sudha sudha Isn't there native support for PNG in Windows? Nish Nishant27-Dec-01 21:56 Nish Nishant 27-Dec-01 21:56  Subject :- Isn't there native support for PNG in Windows? I've requoted my subject. Christian and other GDI gurus... This shocked me quite a bit. I checked out the bitmap section on CP. There are several classes available to display PNG files. But I thought I should start from scratch and try and show a PNG first before I try to manipulate it. Regards GDI newbie Nish Sonork ID 100.9786 voidmain www.busterboy.org If you don't find me on CP, I'll be at Bob's HungOut Re: Isn't there native support for PNG in Windows? Mike Nordell27-Dec-01 23:02 Mike Nordell 27-Dec-01 23:02  Isn't there native support for PNG in Windows? Using Win32 API? No. You can probably work around this by fiddling with COM objects the Internet Explorer pollutes your system with, or you can use e.g. libpng [libpng.org] /Mike Re: Isn't there native support for PNG in Windows? Nish Nishant27-Dec-01 23:14 Nish Nishant 27-Dec-01 23:14  What's so special about PNG anyway? What's wrong with JPG,BMP,GIF??? Why do people want PNG all of a sudden? Nish Sonork ID 100.9786 voidmain www.busterboy.org If you don't find me on CP, I'll be at Bob's HungOut Re: Isn't there native support for PNG in Windows? Mike Nordell27-Dec-01 23:22 Mike Nordell 27-Dec-01 23:22  What's wrong with JPG,BMP,GIF??? JPG is complex and lossy. BMP is basically a raw bit-dump, and as such the most bloated format you could use for off-line storage. GIF is limited by evil patents. PNG has no patent issues, has lossless compression and is just free. Why do people want PNG all of a sudden? All of a sudden? Well, one of the reasons could be that it has been a W3C standard (or was that "just" a recommendation?) for quite a few years now. /Mike Re: Isn't there native support for PNG in Windows? Nish Nishant27-Dec-01 23:41 Nish Nishant 27-Dec-01 23:41  Thanks for all that info. The fact is right now I am in a sort of anti-PNG attitude for some personal-job-related reasons Nish Sonork ID 100.9786 voidmain www.busterboy.org If you don't find me on CP, I'll be at Bob's HungOut Re: Isn't there native support for PNG in Windows? markkuk27-Dec-01 23:24 markkuk 27-Dec-01 23:24  You should read the Introduction to PNG Features and the Rationale appendix of the PNG spec Re: Isn't there native support for PNG in Windows? Nish Nishant27-Dec-01 23:42 Nish Nishant 27-Dec-01 23:42  Thanks MarkKuk Nish Sonork ID 100.9786 voidmain www.busterboy.org If you don't find me on CP, I'll be at Bob's HungOut Re: Isn't there native support for PNG in Windows? Christian Graus28-Dec-01 0:33 Christian Graus 28-Dec-01 0:33  Nish [BusterBoy] wrote: What's wrong with JPG,BMP,GIF??? Why do people want PNG all of a sudden? I dunno about png ( although a lot of people put it forward as a replacement for gif ), but Unisys own the patent to the compression used in gif, so any code that uses gif requires payment of royalties. That is what killed gif online. Christian After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001 Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now Re: Isn't there native support for PNG in Windows? James R. Twine28-Dec-01 7:15 James R. Twine 28-Dec-01 7:15  > Isn't there native support for PNG in Windows?    No (not directly in the Win32 SDK, GDI, or MFC), but there is in GDI+...    Peace! -=- James. Re: Isn't there native support for PNG in Windows? Chris Losinger28-Dec-01 9:16 Chris Losinger 28-Dec-01 9:16  not entirely true... the latest BITMAPINFOHEADER specs include the option of a PNG or JPG encoded data in addition to the old formats. -c Smaller Animals Software, Inc. Re: Isn't there native support for PNG in Windows? James R. Twine28-Dec-01 16:04 James R. Twine 28-Dec-01 16:04  > not entirely true... the latest BITMAPINFOHEADER specs include the option of a > PNG or JPG encoded data in addition to the old formats.    You are correct... For the in-memory representation of the images, but for loading and saving of PNG (or JPEG for that matter) files?  My guess is that is what the OP meant by "native support": the ability to easily load and save a PNG file just as easily as calling "::LoadImage( <pathtobmpfile> ):.    I know that ImportImage(...) does, but that requires an add-on (DirectX/DirectAnimation) to Windows.    Peace! -=- James. Displays a Transparent Image Using Memory DC clemence27-Dec-01 21:51 clemence 27-Dec-01 21:51  Hi I would like to know if anybody can help me out here. I want to create a transparent Image By Performing all operation on a Memory dc. This Is what I have done so far and it works ..The only problem is that I do not know how to initialise the Bitmap which is selected into the memory DC My current code is as folllows.. DrawTrans(CDC* pDC, COLORREF crColor) { COLORREF m_crWhite = RGB(255,255,255); COLORREF m_crBlack = 0; COLORREF crOldBack = pDC->SetBkColor(m_crWhite); COLORREF crOldText = pDC->SetTextColor(m_crBlack); COLORREF crOldBkMode = pDC->SetBkMode(TRANSPARENT); // Create two memory dcs for the image and the mask CDC dcTrans, dcImage; CDC dcFinal; CBitmap bmpFinal; bmpFinal.CreateCompatibleBitmap(pDC,ImageWidth, nImageHeight); dcFinal.CreateCompatibleDC(pDC); dcImage.CreateCompatibleDC(pDC); dcTrans.CreateCompatibleDC(pDC); //m_PImageInfoData is structure contaiing BITMAPINFO bmpInfo; /*char* */ BYTE* pszData; int nImageWidth = m_pImageInfoData->bmpInfo.bmiHeader.biWidth; int nImageHeight = m_pImageInfoData->bmpInfo.bmiHeader.biHeight; int nUsage = DIB_RGB_COLORS; // Create the mask bitmap CBitmap bitmapTrans, bitmapImage; bitmapImage.CreateCompatibleBitmap(pDC, ImageWidth, nImageHeight); bitmapTrans.CreateBitmap(nImageWidth, nImageHeight, 1, 1, NULL); CBitmap* pOldBitmapImage = dcImage.SelectObject(&bitmapImage); // Select the mask bitmap into the appropriate dc CBitmap* pOldBitmapTrans = dcTrans.SelectObject(&bitmapTrans); CBitmap *pOldBmp = dcFinal.SelectObject(&bmpFinal); StretchDIBits(dcImage.GetSafeHdc(), 0, 0, nImageWidth, nImageHeight, 0, 0, nImageWidth, nImageHeight, m_pImageInfoData->pszData, &(m_pImageInfoData->bmpInfo), DIB_RGB_COLORS, SRCCOPY); dcImage.SetBkColor(crColor); // Build mask based on transparent colour dcTrans.BitBlt(0, 0, nImageWidth, nImageHeight, &dcImage, 0, 0, SRCCOPY); dcFinal.StretchBlt(0, 0, nImageWidth, nImageHeight, &dcImage, 0, 0, nImageWidth, nImageHeight, SRCINVERT); dcFinal.StretchBlt(0, 0, nImageWidth, nImageHeight, &dcTrans, 0, 0, nImageWidth, nImageHeight, SRCAND); dcFinal.StretchBlt(0, 0, nImageWidth, nImageHeight, &dcImage, 0, 0, nImageWidth, nImageHeight, SRCINVERT); pDC->StretchBlt(0, 0, nImageWidth, nImageHeight, &dcImage, 0, 0, nImageWidth, nImageHeight, SRCCOPY); // Restore settings dcTrans.SelectObject(pOldBitmapTrans); dcImage.SelectObject(pOldBitmapImage); dcFinal.SelectObject(pOldBmp); bitmapTrans.DeleteObject(); bitmapImage.DeleteObject(); bmpFinal.DeleteObject(); pDC->SetBkMode(crOldBkMode); pDC->SetTextColor(crOldText); pDC->SetBkColor(crOldBack); dcFinal.DeleteDC(); dcTrans.DeleteDC(); dcImage.DeleteDC(); This code works perfectly fine except for the garbage values that are displayed bcoz the Bitmap is not initialized...I would like to know what i can do to initialse the bitmap to NULL ... Thanks ... Clemence Re: Displays a Transparent Image Using Memory DC Mike Nordell27-Dec-01 22:58 Mike Nordell 27-Dec-01 22:58  I would like to know what i can do to initialse the bitmap to NULL BitBlt and BLACKNESS. /Mike Re: Displays a Transparent Image Using Memory DC Rickard Andersson2028-Dec-01 0:36 Rickard Andersson20 28-Dec-01 0:36  BOOL TransparentBlt( HDC hdcDest, // handle to destination DC int nXOriginDest, // x-coord of destination upper-left corner int nYOriginDest, // y-coord of destination upper-left corner int nWidthDest, // width of destination rectangle int hHeightDest, // height of destination rectangle HDC hdcSrc, // handle to source DC int nXOriginSrc, // x-coord of source upper-left corner int nYOriginSrc, // y-coord of source upper-left corner int nWidthSrc, // width of source rectangle int nHeightSrc, // height of source rectangle UINT crTransparent // color to make transparent ); ------------------------------ ©0d3 ©®4©k3® - That's me! ------------------------------ Re: Displays a Transparent Image Using Memory DC Christian Graus28-Dec-01 0:50 Christian Graus 28-Dec-01 0:50  Doesn't work under Windows 95. Christian After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001 Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now inline asm problem in visual C++ HAM27-Dec-01 20:53 HAM 27-Dec-01 20:53  hello, Im not sure why but VS keeps locking up on me. The following code Compiles,links and executes if it is a Win32 Console App: DWORD dwHigh,dwLow; __asm { rdtsc mov dwLow, eax mov dwHigh, edx } However if this is a windowed app, MFC app it will lock up at various times, while running cl.exe or while linking. rdtsc moves the Time Stamp counter into the above registers why does this lock VS up while compiling??? Re: inline asm problem in visual C++ Mike Nordell27-Dec-01 23:17 Mike Nordell 27-Dec-01 23:17  Please elaborate. Is it VC that is "locking up" on you, or is it the app that "will lock up at various times"? You state both alternatives, and somehow I find this hard to believe. What does "lock up" mean? Attach the debugger to your hung exe and see where it's hung. Are you using a single or multi-CPU system? Remember that the TSC is CPU bound. Also keep in mind that you should serialize the CPU if doing any FP operations in proximity of this call (e.g. CPUID with EAX = 0). /Mike Re: inline asm problem in visual C++ HAM28-Dec-01 8:41 HAM 28-Dec-01 8:41  VS locks up on me as a stated. Visual Studio itself "locks up" during compiling. If i go to the task manager it states Visual sutdio is not responding . however it is using about 99% of the processor. I guesse the compiler is in a loop but i dont understand how those three lines of code could put it in a loop. As well as i stated. It will work perfect in a console only app. Any type of windowed app.. MFC or just old win32 API will lock the COMPILER up. Im not doing any floating point ops. Basicly if i use the app wiard and make a generic MFC dialog app and i insert this code anywhere in the premade code. . InitDialog(), OnButton() where ever i put this code will lock VS up. Im running an AMD 500 on XP home editition.. VS Enterprise. .with service packs.

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