C / C++ / MFC

FirstPrevNext

How can i create a numeric constant from a numeric variable ? s.n.arruda15-Sep-12 0:57 s.n.arruda 15-Sep-12 0:57  Hi, I need to create an array using a int variable who cant be a numeric const, because it represent a variable length of something. So i need to use the code: const int iLength = iVariable; int x[iLength]; this code doesn´t work because the c++ allows me just: (suppouse length 10) #define 10 or int x[10]; I do not to use resize array because would be slower someone can help me ? Thanks for your attention Re: How can i create a numeric constant from a numeric variable ? pasztorpisti15-Sep-12 1:08 pasztorpisti 15-Sep-12 1:08  A C array has always fixed length so its length must be a compile time constant. If you want a dynamic array then use stl, more specifically std::vector to do the job. Thats a resizable array. std::vector documentation here Re: How can i create a numeric constant from a numeric variable ? Richard MacCutchan15-Sep-12 2:31 Richard MacCutchan 15-Sep-12 2:31  C++ int* px = new int[iVariable]; One of these days I'm going to think of a really clever signature. Conversion of image Handle hDib to Char* array in C++ AhmdAxf14-Sep-12 2:08 AhmdAxf 14-Sep-12 2:08  Hi All, I have a an image handle provided to me by a device in form of C++ Handle hDib; It is not C++ HDC hDC; I want to convert this hDIB to Char* array for further use in my application. Please let me know if any of you know about a good c++ library for this. Thanks in advance. Re: Conversion of image Handle hDib to Char* array in C++ CPallini14-Sep-12 2:25 CPallini 14-Sep-12 2:25  Could GetDIBits[^] function help you? Veni, vidi, vici. Re: Conversion of image Handle hDib to Char* array in C++ AhmdAxf14-Sep-12 2:46 AhmdAxf 14-Sep-12 2:46  Dear As I mentioned in my question that it is not HDC rather it is C++ HANDLE hDib; The function you mentioned need HDC as a parameter which i donot have Re: Conversion of image Handle hDib to Char* array in C++ CPallini14-Sep-12 2:58 CPallini 14-Sep-12 2:58  What kind of device are you dealing with? Veni, vidi, vici. Re: Conversion of image Handle hDib to Char* array in C++ AhmdAxf14-Sep-12 3:13 AhmdAxf 14-Sep-12 3:13  It is a digital camera Re: Conversion of image Handle hDib to Char* array in C++ CPallini14-Sep-12 3:16 CPallini 14-Sep-12 3:16  How can a digital camera provide a HANDLE to a DIB? Veni, vidi, vici. Re: Conversion of image Handle hDib to Char* array in C++ AhmdAxf14-Sep-12 3:23 AhmdAxf 14-Sep-12 3:23  It is a method provided in its SDK which I'm using It also saves it on the disk but I want to convert it into Char* array and later to jbyteArray. Well the question is Is it possible to convert this Handle (which is obviously a pointer to that specific DIB) to char* array modified 14-Sep-12 9:31am. Re: Conversion of image Handle hDib to Char* array in C++ Chris Losinger14-Sep-12 5:56 Chris Losinger 14-Sep-12 5:56  if that handle is really a pointer to a DIB, then it's a pointer to an BITMAPINFOHEADER, with the pixel bytes immediately following. image processing toolkits | batch image processing Re: Conversion of image Handle hDib to Char* array in C++ Richard MacCutchan14-Sep-12 7:37 Richard MacCutchan 14-Sep-12 7:37  It's most unlikely that you would want to convert it to a char* array. If it is really a pointer to some form of bitmap then there should be a function that will return the actual bitmap structure or byte array for you, but without knowing anything about the SDK you are using it's impossible to know what. One of these days I'm going to think of a really clever signature. Re: Conversion of image Handle hDib to Char* array in C++ AhmdAxf27-Sep-12 21:23 AhmdAxf 27-Sep-12 21:23  Thank you all for your response i have been able to create a C++ HBITMAP from my DIB C++ HANDLE DIB by using info header and filling it using GDI . I also have been able to save it to my disk and to draw it on screen by using C++ StretchDIBits method of the same library.Conversion of DIB to char* was not a good option.Now i want to know that is there any other good API or C++ library which can be used to draw DIB directly on C++ tagRect in an MFC application. Re: Conversion of image Handle hDib to Char* array in C++ Richard MacCutchan27-Sep-12 22:54 Richard MacCutchan 27-Sep-12 22:54  StretchDIBits() already performs that function; what do you mean by tagRect? One of these days I'm going to think of a really clever signature. Re: Conversion of image Handle hDib to Char* array in C++ AhmdAxf28-Sep-12 0:25 AhmdAxf 28-Sep-12 0:25  It is a structure which draws a rectangle in windows applications. The problem with that method is that when i minimize my application and again restore it. The image disappears. I have also used the function C++ FillRect() but the problem still persists. Kindly help me in this regard Re: Conversion of image Handle hDib to Char* array in C++ Richard MacCutchan28-Sep-12 1:58 Richard MacCutchan 28-Sep-12 1:58  AhmdAxf wrote: when i minimize my application and again restore it. The image disappears. So, you are probably doing something wrong, quite possibly drawing in the wrong place. You must put all your drawing code inside the function that handles the WM_PAINT message. One of these days I'm going to think of a really clever signature. Re: Conversion of image Handle hDib to Char* array in C++ AhmdAxf3-Oct-12 1:28 AhmdAxf 3-Oct-12 1:28  Actually it is not a MFC application which does have a method which contains WM_PAINT message. Rather it is a java applet and I'm drawing through AWT native Interface. Re: Conversion of image Handle hDib to Char* array in C++ Richard MacCutchan3-Oct-12 1:32 Richard MacCutchan 3-Oct-12 1:32  So why was this posted in the C/C++/MFC forum and titled "Conversion of image Handle hDib to Char* array in C++"? One of these days I'm going to think of a really clever signature. Re: Conversion of image Handle hDib to Char* array in C++ AhmdAxf3-Oct-12 2:44 AhmdAxf 3-Oct-12 2:44  There is no separate forum for c++ or AWT native interface or JNI. So I have to post it here Re: Conversion of image Handle hDib to Char* array in C++ AhmdAxf3-Oct-12 2:48 AhmdAxf 3-Oct-12 2:48  Please Let me know if there is any useful forum for this particular technology Re: Conversion of image Handle hDib to Char* array in C++ Richard MacCutchan3-Oct-12 4:33 Richard MacCutchan 3-Oct-12 4:33  There are clearly marked forums here for Java and for C++; choose the one that is most appropriate to your problem and describe the problem in detail. One of these days I'm going to think of a really clever signature. I want to use R-Tree in my GIS project,how R-Tree is work? mengfei35813-Sep-12 14:59 mengfei358 13-Sep-12 14:59  how to creat a R-Tree based on GIS.spatial object,if I know the MBR of each spatial object.how I can Know when to merge some MBR together? Re: I want to use R-Tree in my GIS project,how R-Tree is work? CPallini13-Sep-12 23:18 CPallini 13-Sep-12 23:18  Google and Wikipedia are fantastic tools, you know. For instance, the R-Tree page[^] at Wikipedia looks promising. Veni, vidi, vici. Re: I want to use R-Tree in my GIS project,how R-Tree is work? mengfei35823-Sep-12 15:04 mengfei358 23-Sep-12 15:04  Thank you Re: I want to use R-Tree in my GIS project,how R-Tree is work? CPallini23-Sep-12 21:25 CPallini 23-Sep-12 21:25  You are welcome. Veni, vidi, vici.

Last Visit: 31-Dec-99 18:00     Last Update: 29-Apr-24 19:37 Refresh ᐊ Prev1...881882883884885886887888889890 Next ᐅ

General    News    Suggestion    Question    Bug    Answer    Joke    Praise    Rant    Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.