QT Error with Twain Data Source

[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.

[mrjj]

HI
The UNUSED ARG ?