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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