Qt4 and TWAIN scanning

[d_stranz]

It is probably because the QTwain class requires an event loop to be running, and until you call app.exec(), there is no event loop.

Your code is fundamentally different from the example in the previous post in the thread. You need to move your twain code into a method that gets called after the event loop has started.

[high_flyer]

Good point.

[Kata]

It is probably because the QTwain class requires an event loop to be running, and until you call app.exec(), there is no event loop.

Your code is fundamentally different from the example in the previous post in the thread. You need to move your twain code into a method that gets called after the event loop has started.

Thank you very much,
I create a Widget QTwain and used according to your examples, but I have not found a way to save the image acquired only by the interface.
The only way, according to my investigations, would be to uncomment the lines 92 to 95 of qtwain.cpp, and yet I know not how to get the values to pass as an argument to CopyImage.

For your help,
By advance,
Thanks

[^NyAw^]

Hi,

As I said, I only modify code snippets to get to do what I needed. Improvements that you can get will be welcome.
I only tested on a Brother multifunction printer, so If anyone can test on othre devices and check if it works it will be great.

[Kata]

Hello,
thank you for your answers
I have cleaned the code and set more generical QtTwain and I have added a methode to save the scanned image.

Enjoy

[elegido03]

Hi

First thanks to kata for you help. Now the problem is that I can not see the image out.jpg. debido a esto:

QPixmap::fromWinHBITMAP(), failed to get bitmap info ()

I have windows 7, qt creator 2.01 based qt 4.7.0.

this is what I do

1)instal qt creator sdk
2) open qt creator, open project, I look for. pro and open it.
3) running

What am I doing wrong? or I'm missing.
-----------------------------------------------------
In the .pro :
TEMPLATE = app
TARGET =
DEPENDPATH += .
INCLUDEPATH += .
LIBS += -lgdi32

# Input
HEADERS += qtwain.h stdafx.h twain.h twaincpp.h
SOURCES += main.cpp qtwain.cpp twaincpp.cpp
-------------------------------------------------------
Qt displays the following messages:

Application Output:
Starting C:\Users\Elegido\Desktop\QtScanner5-build-desktop\debug\QtScanner5.exe...
QPixmap::fromWinHBITMAP(), failed to get bitmap info ()

Compile output:
Running build steps for project QtScanner5...
Configuration unchanged, skipping qmake step.
Starting: "C:/Qt/2010.05/mingw/bin/mingw32-make.exe" -w
mingw32-make: Entering directory `C:/Users/Elegido/Desktop/QtScanner5-build-desktop'

C:/Qt/2010.05/mingw/bin/mingw32-make -f Makefile.Debug

mingw32-make[1]: Entering directory `C:/Users/Elegido/Desktop/QtScanner5-build-desktop'

mingw32-make[1]: Nothing to be done for `first'.

mingw32-make[1]: Leaving directory `C:/Users/Elegido/Desktop/QtScanner5-build-desktop'

mingw32-make: Leaving directory `C:/Users/Elegido/Desktop/QtScanner5-build-desktop'

The process "C:/Qt/2010.05/mingw/bin/mingw32-make.exe" exited normally.

PLease Help!! tThanks

[^NyAw^]

Hi,

Someone is telling me that the file is not uncompressing right. Try this other one

[schweini]

Hi!
Can u help me to save an image from scanner and display it in a dialog
thanks and best regard ^^

[hassanbuzer]

Hello everyone I've tryed twain but all I can get is To select the scanner an nothing more.. NO SCANNING ACTION. Any one to tell how can use it in my application . thank u.