I also tried this (inside the thread method):
ETEXT_DESC monitor;
monitor.cancel = &CMyDocEx::cancel;
monitor.cancel_this = this;
api->Recognize(&monitor);
std::shared_ptr<tesseract::TessPDFRenderer> renderer =
std::make_shared<tesseract::TessPDFRenderer>(
CStringA(sSrcFile), api->GetDatapath(), false);
if (! api->ProcessPages(CStringA(sSrcFile), nullptr, 0,
renderer.get()))
{
break;
}
and
// CMyDocEx header:
class CMyDocEx : public CDocument
{
.....
static bool cancel(void* cancel_this, int words)
{
return true;
}
Stopping *api->ProcessPages* it is a mission impossible ?
On Tuesday, June 21, 2022 at 6:03:04 PM UTC+3 [email protected] wrote:
> Win10, VS2017, MFC C++ application, Tesseract 4.1.1
>
> I started *TessBaseAPI::ProcessPage* call, and I realized I couldn't stop
> it. I noticed the prototype of *TessBaseAPI::ProcessPages*, if the int
> timeout_millisec parameter is greater than 0, the library uses internally a
> *ETEXT_DESC* monitor:
>
> // *from TessBaseAPI source code:*
>
> bool TessBaseAPI::ProcessPage(Pix* pix, int page_index, const char*
> filename,
> const char* retry_config, int
> timeout_millisec,
> TessResultRenderer* renderer) {
> ....
> PageIterator* it = AnalyseLayout();
>
> if (it == nullptr) {
> failed = true;
> } else {
> delete it;
> }
> } else if (tesseract_->tessedit_pageseg_mode == PSM_OSD_ONLY) {
> failed = FindLines() != 0;
> } else if (timeout_millisec > 0) {
> // Running with a timeout.
> ETEXT_DESC monitor;
> monitor.cancel = nullptr;
> monitor.cancel_this = nullptr;
> monitor.set_deadline_msecs(timeout_millisec);
>
> as you see, if *timeout_millisec* is greater than 0, some monitor is set
> up, however, not to stopping the process on demand, but for timout.
>
> My question is: can be stopped *TessBaseAPI::ProcessPages* in a way,
> maybe using *ETEXT_DESC* ?
>
> I have tried this (*ReadImageThread* is used as multi-thread, not as
> single thread):
>
> void CMyDocEx::ReadImageThread(const CString& sSrcFile)
> {
> do
> {
> std::shared_ptr<tesseract::TessBaseAPI> api =
> std::make_shared<tesseract::TessBaseAPI>();
> if (api->Init(CStringA(GetAppPathTemp()), "eng"))
> {
> break;
> }
>
> api->Recognize(&m_monitor);
>
> std::shared_ptr<tesseract::TessPDFRenderer> renderer =
> std::make_shared<tesseract::TessPDFRenderer>(
> CStringA(GetFileName(sSrcFile)), api->GetDatapath(),
> false);
>
> if (! api->ProcessPages(CStringA(sSrcFile), nullptr, 0,
> renderer.get()))
> {
> break;
> }
> api->End();
> } while (FALSE);
> }
>
> where *m_monitor* is defined in my *CMyDocEx* header:
>
> class CMyDocEx : public CDocument
> {
> ....
> protected:
> static bool cancel(void* cancel_this, int words)
> {
> return m_bCancelFlag;
> }
> ....
> protected:
> ETEXT_DESC m_monitor;
> static bool m_bCancelFlag;
> ....
> }
>
> and implementation file (*cpp*):
>
> bool CMyDocEx::m_bCancelFlag = false;
>
> CMyDocEx::CMyDocEx()
> {
> // TODO: add one-time construction code here
>
> m_monitor.cancel = &CMyDocEx::cancel;
> m_monitor.cancel_this =
> reinterpret_cast<void*>(CMyDocEx::m_bCancelFlag);
> }
>
> and when I put *m_bCancelFlag* to true, seems to happen nothing ...
>
>
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