QT Error with Twain Data Source

[mrjj]

@bhim
Np.
I noticed there are some FreeImage lib files.
Not sure it uses it but make sure they are compatible with vs 2008 if it does.

Its pretty old project. there are no newer twain samples?

[bhim]

This is the latest sample they have. With this i m getting below error , would you be able to help with this one as well?

I know how to take care of these in VS but not in QT.

[mrjj]

@bhim
Well Qt is just a normal c++ LIB
and those are normal windows API calls so fix them like you normal would.
seems to be unicode related.
Didnt it later become common to put _TCHAR or something in front ?
or use wchar_t* and not char * ?
maybe you can just use the A version of the API and not W version

[mrjj]

Hi
I wondered if
https://github.com/twain/twain-samples
is something else than the twain you try ?

[bhim]

I tried the exact same exact same Twain.

[mrjj]

@bhim
Ok but it didnt work or was not what you wanted?

[bhim]

It did not work. However i am able to resolve most of the error for data type conversion. I am now stuck at below, i am not able to go to definition\declaration of this method to make any change. I know how to do it in Visual Studio but not in QT. Can you please help

[bhim]

Hi,

I have resolved all string related error. Now my project is showing this :-1: error: LNK1104: cannot open file 'freeimage.lib' . If i could find the Visual Studio equivalent or Project property in QT, that would be very helpful to very file the linker paths.

[mrjj]

@bhim
you mean to link the LIB file to the project ?
http://doc.qt.io/qt-5/third-party-libraries.html
http://doc.qt.io/qtcreator/creator-project-qmake-libraries.html

Basically you need a
LIBS += -L"3rdparty/CatWhisperer/lib" -lCatWhisperer
(with correct names of course)

[bhim]

Thanks , this resolve the lib issue. Now below 2 error

14:31:45: Running steps for project src...
14:31:45: Configuration unchanged, skipping qmake step.
14:31:45: Starting: "C:\Qt\qtcreator-4.5.0\bin\jom.exe"
c:\Qt\4.8.7\bin\qmake.exe -spec c:\Qt\4.8.7\mkspecs\win32-msvc2008 CONFIG+=release -o Makefile ..\src\src.pro
C:\Qt\qtcreator-4.5.0\bin\jom.exe -f Makefile.Debug
link /LIBPATH:"c:\Qt\4.8.7\lib" /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /DLL /MANIFEST /MANIFESTFILE:"debug\TWAINDS_FreeImage.intermediate.manifest" /OUT:debug\TWAINDS_FreeImage.dll @C:\Users\rathorb\AppData\Local\Temp\TWAINDS_FreeImage.dll.13524.62.jom
TWAIN_UI.obj : error LNK2019: unresolved external symbol __imp__SHGetSpecialFolderPathA@16 referenced in function "public: __thiscall CTWAIN_UI::CTWAIN_UI(class CTWAINDS_FreeImage *)" (??0CTWAIN_UI@@QAE@PAVCTWAINDS_FreeImage@@@Z)
debug\TWAINDS_FreeImage.dll : fatal error LNK1120: 1 unresolved externals
jom: C:\ODIImages\Source\Twain\twain-samples-master\twain-samples-master\TWAIN-Samples\Twain_DS_sample01\build-src-Unnamed-Release\Makefile.Debug [debug\TWAINDS_FreeImage.dll] Error 1120
jom: C:\ODIImages\Source\Twain\twain-samples-master\twain-samples-master\TWAIN-Samples\Twain_DS_sample01\build-src-Unnamed-Release\Makefile [debug] Error 2
14:31:51: The process "C:\Qt\qtcreator-4.5.0\bin\jom.exe" exited with code 2.
Error while building/deploying project src (kit: Unnamed)
The kit Unnamed has configuration issues which might be the root cause for this problem.
When executing step "Make"
14:31:51: Elapsed time: 00:06.

debug\TWAINDS_FreeImage.dll:-1: error: LNK1120: 1 unresolved externals

[mrjj]

Hi
seems you need to link to
Shell32.lib also
https://msdn.microsoft.com/en-us/library/windows/desktop/bb762204(v=vs.85).aspx

[bhim]

Thanks. I m able to build and run it now. But not able to find the output file, a .ds file anywhere? Can you please help me find where project is generating this file.

Below is pro file code

unix {
TEMPLATE = lib
VERSION = 1.0
DEFINES += UNIX
}
PROJECT_FILE_NAME = TWAINDS_FreeImage
TARGET = $$PROJECT_FILE_NAME
LIBS += -lfreeimage

TWAIN datasources end with a .ds instead of .so

QMAKE_POST_LINK = cp
$(TARGET)
$${PROJECT_FILE_NAME}.ds
ds.path = /usr/local/lib/twain/FreeImage
ds.files = $${PROJECT_FILE_NAME}.ds
TWAIN_logo.png
INSTALLS += ds
QMAKE_CLEAN = $${PROJECT_FILE_NAME}.ds
INCLUDEPATH = /usr/local/include
../../pub/external/include
../../pub/include
../../visual_studio/Debug32
../../common
LIBS += -L"../../pub/external/lib" -lFreeImage
SOURCES += ../../common/CTiffWriter.cpp
../../common/CommonTWAIN.cpp
CommonDS.cpp
CScanner_FreeImage.cpp
CTWAINDS_Base.cpp
CTWAINDS_FreeImage.cpp
DSMInterface.cpp
TWAINContainer.cpp
TWAINContainerFix32.cpp
TWAINContainerFrame.cpp
TWAINContainerInt.cpp
CTWAINDS_Sample1.cpp
TWAIN_UI.cpp
TWAINContainerString.cpp
TWAINContainerFix32Range.cpp
TWAINContainerBool.cpp
QT_UI.cpp
Qt_MainForm.cpp
Qt_About.cpp
Qt_ProfileName.cpp
HEADERS += ../../common/Common.h
../../common/CommonTWAIN.h
../../common/CTiffWriter.h
CScanner_FreeImage.h
CTWAINDS_Base.h
CTWAINDS_FreeImage.h
CommonDS.h
DSMInterface.h
TWAINContainerFix32.h
TWAINContainerFrame.h
TWAINContainer.h
TWAINContainerInt.h
CTWAINDS_Sample1.h
TWAIN_UI.h
TWAINContainerString.h
TWAINContainerFix32Range.h
TWAINContainerBool.h
QT_UI.h
Qt_MainForm.h
Qt_About.h
Qt_ProfileName.h
ui_About.h
ui_MainForm.h
ui_About.h
TEMPLATE = lib
CONFIG += warn_on
debug
x86 ppc

QMAKE_BUNDLE_EXTENSION = ds

this project doesn't need any QT libs.

QMAKE_LIBS_QT =
QMAKE_LIBS_QT_THREAD =
FORMS += MainForm.ui
About.ui
ProfileName.ui
RESOURCES += qtresources.qrc

unix|win32: LIBS += -lshell32

[mrjj]

@bhim
Its not in build folder?

[bhim]

Its there, but its in dll extension, its supposed to be .ds extension.

[mrjj]

@bhim
What is a .ds file ?

[bhim]

ds is Twain data source, OR Twain Driver. See below from my pro file, based on this it should have generated

TWAIN datasources end with a .ds instead of .so

QMAKE_POST_LINK = cp
$(TARGET)
$${PROJECT_FILE_NAME}.ds
ds.path = /usr/local/lib/twain/FreeImage
ds.files = $${PROJECT_FILE_NAME}.ds
TWAIN_logo.png
INSTALLS += ds
QMAKE_CLEAN = $${PROJECT_FILE_NAME}.ds

[mrjj]

@bhim
Ok but a SO file is a DLL.
so being on windows, i wonder if the DS is just a DLL.

Is that to load into the sample project ?

[bhim]

I change the DLL extension to ds and replaced with original DS file. It dd not work, it was not even detected. I think if somehow i could emit a .ds file , it will work. Below is the project property of visual studio project which generated original ds file

[mrjj]

Sorry i have no idea what / how a ds file should be produced.
Site says
copy TWAINDS_Sample[32|64].ds to /Windows/twain_[32|64]/sample2
so it looks like a DLL. but sadly i cant find out more.

[bhim]

Coding wise everything looks fine, I am trying to debug ds file using a sample connection application. But connection application itself is giving below error. Can you please help.