Hi, James and Jessica, the question you are asking here are beginner dev question, not tesseract specific. If you want to read BMP, TIFF, JPG, PNG images under Windows (native C+ + or .NET) use GdiPlus. It's free, well documented and you have a working example with Tesseract. In Google "GdiPlus Library" gives you http://msdn.microsoft.com/en-us/library/ms533798(VS.85).aspx Always in Google "GdiPlus tutorial" gives you http://www.codeproject.com/KB/GDI-plus/startinggdiplus.aspx to read image file (one line of code) http://www.codeproject.com/KB/GDI-plus/cgdiplusbitmap.aspx and to use it in C++ tesseract download http://www.pixel-technology.com/freeware/tessnet2/src.zip open tessnet2.cpp and look for tessnet2::Tesseract::PutImage line 272
Rémi On Feb 4, 6:25 pm, JamesBaker <[email protected]> wrote: > Jessicia: I am working towards the same objective, but I have come > into problems with linking, this code works, but when I call tessdll > functions I am getting errors with both linking and access violations: > > Also, if anyone can help me here as there is very little > documentation, is this the right method? I have no idea wether or not > I am grabbing the correct BMP data or not. Do I need the whole MS DIB > bitmap format: data + header, or just the data? > > unsigned char* ScreenCap(int x, int y, int w, int h) //PORT (w,h) ??? > { > //int nScreenWidth = GetSystemMetrics(SM_CXSCREEN); > //int nScreenHeight = GetSystemMetrics(SM_CYSCREEN); > > int portedX = x * resolution.first.first / resolution.second.first; > int portedY = y * resolution.first.second / resolution.second.second; > > HWND hDesktopWnd = GetDesktopWindow(); > HDC hDesktopDC = GetDC(mtgowin); > HDC hCaptureDC = CreateCompatibleDC(hDesktopDC); > HBITMAP hCaptureBitmap =CreateCompatibleBitmap(hDesktopDC, w, h); > SelectObject(hCaptureDC,hCaptureBitmap); > BitBlt(hCaptureDC,0,0,w,h,hDesktopDC, portedX,portedY,SRCCOPY); > > //convert to unsigned char[] > > BITMAPINFO bmpInfo; > > HDC hdc=GetDC(NULL); > ZeroMemory(&bmpInfo,sizeof(BITMAPINFO)); > bmpInfo.bmiHeader.biSize=sizeof(BITMAPINFOHEADER); > > GetDIBits(hdc,hCaptureBitmap,0,0,NULL, &bmpInfo,DIB_RGB_COLORS); > //unsigned char* retArray = new unsigned char > [bmpInfo.bmiHeader.biSizeImage]; > LPVOID retArray = malloc(bmpInfo.bmiHeader.biSizeImage); > > bmpInfo.bmiHeader.biCompression=BI_RGB; > GetDIBits(hdc,hCaptureBitmap,0,bmpInfo.bmiHeader.biHeight, retArray, > &bmpInfo, DIB_RGB_COLORS); > > ReleaseDC(hDesktopWnd,hDesktopDC); > DeleteDC(hCaptureDC); > DeleteObject(hCaptureBitmap); > if(hdc) ReleaseDC(NULL,hdc); > > return (unsigned char*)retArray; > > } > > On Feb 4, 8:39 am, Jessica <[email protected]> wrote: > > > At first I was using tessdll. > > I need to convert a bitmap that I have in memory to an unsigned char > > *. > > I used LockBit, then Scan0 on the BitmapData, and I have my unsigned > > char *. > > > Unfortunately this does not work when passed to TessDLL api. > > > Do you know how to format the unsigned char * the way tess dll wants > > it? > > > On 4 fév, 14:36, rthomas <[email protected]> wrote: > > > > Yes this is a .NET project but the C++ code source is the same for > > > GdiPlus API. > > > You can understand how to use LockBit. > > > > Remi > > > > On Feb 4, 12:58 pm, Jessica <[email protected]> wrote: > > > > > Thank you very much for your answer rthomas. > > > > > I don't know at all .NET in fact. > > > > My project is a traditionnal c++ project (windows application). I'd > > > > like to use the .net assembly in this project. > > > > Is it possible? > > > > > In the link you gave me , apparently you need to use the tessnet2 in > > > > a .net project. Is it possible to easily switch from a c++ project to > > > > a .net project? What are the differences? > > > > > Thanks! > > > > > On 4 fév, 12:07, rthomas <[email protected]> wrote: > > > > > > Hi, > > > > > > Look tessnet2 source code, It's done with > > > > > Gdi+.http://www.pixel-technology.com/freeware/tessnet2/src.zip > > > > > > Rémi > > > > > > On Feb 4, 10:22 am, Jessica <[email protected]> wrote: > > > > > > > Hi, > > > > > > > I have a big problem. > > > > > > I want to ocr screenshots. > > > > > > > I am under windows vista, using c++, gdi+ > > > > > > > I have a Gdiplus::Bitmap, I need to convert it to an unsigned char * > > > > > > to put it in TessDLLAPI (I'm using tessdll.dll) > > > > > > > I used the function LockBits to get a BitmapData and then scan0 to > > > > > > get > > > > > > an unsigned char * > > > > > > But this does not work! > > > > > > > I don't know how to format it. > > > > > > Could someone help me please? > > > > > > > Thank you!- Hide quoted text - > > > > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "tesseract-ocr" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/tesseract-ocr?hl=en -~----------~----~----~----~------~----~------~--~---
