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 -
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