Hi Morgy,
Summary:
It compiles and links. It crashes the first time I try to access a
function from the dll, with no error message.
Details:
I have it working partly. I added your wrapper (cTessdll.cpp and
cTessdll.h), and then used your sample code below, from "TessDLL
*Tesseract = new TessDLL();" all the way to the end ("delete
Tesseract;")..
It compiles and links fine.
When I run it, the program crashes at the line:
Tesseract->TessDllBeginPageLangBPP(VirtualWidth, bmOCR->Height,bmOCR-
>ScanLine[bmOCR->Height-1], NULL,bpp);
The "try" doesn't catch it -- it just simply exits with no error
message. If I step through the program up to that point, I can see
that all the variables are initialized. My .bmp image is opened, and
the program comes up with valid VirtualWidth, etc. I even added a
separate "try" for this line only, with no changes.
I notice that this is the first line that actually makes any calls to
tessdll.dll, I think, so I assume it somehow isn't linked in
correctly, though the line "TessHandle = LoadLibrary("tessdll.dll");"
in cTessdll.cpp comes up with a valid TessHandle.
I tried it without adding a Tess library to the project, then also
both the original library, and then a new one by running IMPLIB on
tessdll.dll. It always immediately stopped at that point.
What am I doing wrong?
Thanks, I feel like I am getting very close. If I can get over this
hump I think I'm good to go.
Daryl
On Oct 8, 4:28 pm, Morgy <[EMAIL PROTECTED]> wrote:
> You have to use a dll wrapper.
>
> for example the one i made
>
> cTessdll.h
>
> #ifndef tess_dllH
> #define tess_dllH
> //---------------------------------------------------------------------------
> #include <Windows.hpp> // Pascal unit
> #include <SysInit.hpp> // Pascal unit
> #include <System.hpp> // Pascal unit
> //---------------------------------------------------------------------------
>
> typedef struct
> {
> Word char_code;
> short left;
> short right;
> short top;
> short bottom;
> short font_index;
> Byte confidence;
> Byte point_size;
> Shortint blanks;
> Byte formatting;} TEANYCODE_CHAR;
>
> //---------------------------------------------------------------------------
>
> typedef struct
> {
> short count;
> short progress;
> Shortint more_to_come;
> Shortint ocr_alive;
> Shortint err_code;
> void *cancel;
> void *cancel_this;
> int end_time;
> ::TEANYCODE_CHAR text[32000];
>
> } TETEXT_DESC;
>
> //---------------------------------------------------------------------------
> // TESSDLL Class
> //---------------------------------------------------------------------------
> class TessDLL
> {
> private:
> bool LoadDLL(void);
> public:
> TessDLL();
> ~TessDLL();
>
> AnsiString ConvertText(TETEXT_DESC *EText_Desc);
>
> int __cdecl (*TessDllBeginPage)(unsigned xsize, unsigned
> ysize, void * buf);
> int __cdecl (*TessDllBeginPageLang)(unsigned xsize, unsigned
> ysize, void * buf, const char * lang);
> int __cdecl (*TessDllBeginPageUpright)(unsigned xsize,
> unsigned ysize, void * buf, const char * lang);
> int __cdecl (*TessDllBeginPageBPP)(unsigned xsize, unsigned
> ysize, void * buf, Byte bpp);
> int __cdecl (*TessDllBeginPageLangBPP)(unsigned xsize,
> unsigned ysize, void * buf, const char * lang, Byte bpp);
> int __cdecl (*TessDllBeginPageUprightBPP)(unsigned xsize,
> unsigned ysize, void * buf, const char * lang, Byte bpp);
> int __cdecl (*TessDllEndPage)(void);
> ::TETEXT_DESC * __cdecl (*TessDllRecognize_a_Block)(unsigned
> left, unsigned right, unsigned top, unsigned bottom);
> ::TETEXT_DESC * __cdecl (*TessDllRecognize_all_Words)(void);
> int __cdecl (*TessDllRelease)(void);
>
> HANDLE TessHandle;
> bool TessDLLLoaded;};
>
> //---------------------------------------------------------------------------
> #endif
>
> cTessdll.cpp
>
> //---------------------------------------------------------------------------
>
> #include <vcl.h>
> #pragma hdrstop
>
> #include "cTessdll.h"
> //---------------------------------------------------------------------------
> TessDLL::TessDLL()
> {
> TessDLLLoaded = false;
> TessDLLLoaded = LoadDLL();}
>
> //---------------------------------------------------------------------------
> TessDLL::~TessDLL()
> {
> if (TessDLLLoaded){
> TessDllRelease();
> FreeLibrary(TessHandle);
> }}
>
> //---------------------------------------------------------------------------
>
> bool TessDLL::LoadDLL(void)
> {
> if (TessDLLLoaded)
> return(true);
>
> TessHandle = LoadLibrary("TESSDLL.DLL");
> if(TessHandle != NULL) {
> TessDllBeginPage = (int (*)(unsigned int,unsigned
> int,void *))
>
> GetProcAddress((HINSTANCE)TessHandle,"TessDllBeginPage");
> TessDllBeginPageLang = (int (*)(unsigned int,unsigned
> int,void *,const char *))
>
> GetProcAddress((HINSTANCE)TessHandle,"TessDllBeginPageLang");
> TessDllBeginPageUpright = (int (*)(unsigned
> int,unsigned int,void *,const char *))
>
> GetProcAddress((HINSTANCE)TessHandle,"TessDllBeginPageUpright");
> TessDllBeginPageBPP = (int (*)(unsigned int,unsigned
> int,void *,unsigned char))
>
> GetProcAddress((HINSTANCE)TessHandle,"TessDllBeginPageBPP");
> TessDllBeginPageLangBPP = (int (*)(unsigned
> int,unsigned int,void *,const char *,unsigned char))
>
> GetProcAddress((HINSTANCE)TessHandle,"TessDllBeginPageLangBPP");
> TessDllBeginPageUprightBPP = (int (*)(unsigned
> int,unsigned int,void *,const char *,unsigned char))
>
> GetProcAddress((HINSTANCE)TessHandle,"TessDllBeginPageUprightBPP");
> TessDllEndPage = (int (*)())
>
> GetProcAddress((HINSTANCE)TessHandle,"TessDllEndPage");
> TessDllRecognize_a_Block = (TETEXT_DESC * (*)(unsigned
> int,unsigned int,unsigned int,unsigned int))
>
> GetProcAddress((HINSTANCE)TessHandle,"TessDllRecognize_a_Block");
> TessDllRecognize_all_Words = (TETEXT_DESC * (*)())
>
> GetProcAddress((HINSTANCE)TessHandle,"TessDllRecognize_all_Words");
> TessDllRelease = (int (*)())
>
> GetProcAddress((HINSTANCE)TessHandle,"TessDllRelease");
>
> if(TessDllBeginPage && TessDllBeginPageLang &&
> TessDllBeginPageUpright && TessDllBeginPageBPP
> &&
> TessDllBeginPageLangBPP &&
> TessDllBeginPageUprightBPP &&
> TessDllEndPage && TessDllRecognize_a_Block &&
> TessDllRecognize_all_Words && TessDllRelease){
> return(true); //Succeeded
> } else {
> FreeLibrary(TessHandle);
> return(false);
> }
> } else {
> return(false);
> }}
>
> //---------------------------------------------------------------------------
>
> AnsiString TessDLL::ConvertText(::TETEXT_DESC *EText_Desc)
> {
> TEANYCODE_CHAR ch;
> AnsiString Result = "";
>
> for (int i = 0; i < EText_Desc->count; i++){
> ch = EText_Desc->text[i];
> for (int b = 0; b < ch.blanks; ++b)
> Result = Result + " ";
> Result = Result + char(ch.char_code);
> if (ch.formatting & 64)
> Result = Result + "\r\n";
> if (ch.formatting & 128)
> Result = Result + "\r\n";
> }
>
> return Result;}
>
> //---------------------------------------------------------------------------
>
> then you can use it in a program like
>
> TessDLL *Tesseract = new TessDLL();
>
> AnsiString result;
>
> if (Tesseract->TessDLLLoaded){
> Graphics::TBitmap *bmOCR = new Graphics::TBitmap();
> bmOCR->LoadFromFile("test.bmp");
>
> int BytesPerLine = int(bmOCR->ScanLine[0])-
> int(bmOCR->ScanLine[1]);
> int bpp, VirtualWidth;
> bmOCR->HandleType = bmDIB;
> switch (bmOCR->PixelFormat) {
> case pfDevice :
> bmOCR->PixelFormat = pf24bit;
> bpp = 24;
> break;
> case pf1bit :
> bpp = 1;
> break;
> case pf4bit :
> bmOCR->PixelFormat = pf8bit;
> bpp = 8;
> break;
> case pf8bit :
> bpp = 8;
> break;
> case pf15bit :
> bmOCR->PixelFormat = pf24bit;
> bpp = 24;
> break;
> case pf16bit :
> bmOCR->PixelFormat = pf24bit;
> bpp = 24;
> break;
> case pf24bit :
> bpp = 24;
> break;
> case pf32bit :
> bmOCR->PixelFormat = pf24bit;
> bpp = 24;
> break;
> }
>
> switch (bpp) {
> case 1 :
> VirtualWidth = BytesPerLine * 8;
> break;
> case 8 :
> VirtualWidth = BytesPerLine;
> break;
> case 24 :
> bmOCR->Width = 4*((bmOCR->Width+3) /
> 4);
> VirtualWidth = bmOCR->Width;
> break;
> }
>
> try {
> try {
>
> Tesseract->TessDllBeginPageLangBPP(VirtualWidth,
>
> bmOCR->Height,
> bmOCR->ScanLine[bmOCR->Height-1],
>
> NULL,
> bpp);
>
> TETEXT_DESC *RecognizedText;
>
> RecognizedText =
> Tesseract->TessDllRecognize_all_Words();
>
> result =
> Tesseract->ConvertText(RecognizedText);
>
> }
> __finally {
> Tesseract->TessDllEndPage();
> }
> }
> __except (true) {
> result = ".ERROR.";
> }
>
> delete bmOCR;
>
> }
>
> delete Tesseract;
>
> etc.....
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