I have a simple project created in Qt Creator (installed using Qt SDK 1.1.4). It runs just fine from within Qt Creator, but if I then browse to the output directory in Windows and double-click the EXE, I'll get an error like:
The program can't start because QtCored4.dll is missing from your computer.
Try reinstalling the program to fix this problem.
That's obviously because Qt isn't in my PATH (and I don't want it to be, in case I have multiple versions of Qt on my computer), and Qt Creator / qmake didn't copy the Qt DLLs to the project output.
What I would like to do is use qmake to copy the necessary Qt files to the project output directory - wherever it may be. How do I do this?
(I tried creating a custom target in qmake, but I'm not getting too far...)
UPDATE July 19, 2016: Just to clarify, the above post was concerning Qt4. On Qt5, you should instead look into calling windeployqt
. This Qt5 tool will read your binary, determine which Qt5 runtime files you need, and copy them to your binary directory. Also note that it will fix absolute paths in the Qt5::Core library that are specific to your PC - so use of this tool is basically mandatory unless you want to provide a qt.conf
file yourself.
OK, here's an ugly hack:
# Copy required DLLs to output directory
CONFIG(debug, debug|release) {
QtCored4.commands = copy /Y %QTDIR%\\bin\\QtCored4.dll debug
QtCored4.target = debug/QtCored4.dll
QtGuid4.commands = copy /Y %QTDIR%\\bin\\QtGuid4.dll debug
QtGuid4.target = debug/QtGuid4.dll
QMAKE_EXTRA_TARGETS += QtCored4 QtGuid4
PRE_TARGETDEPS += debug/QtCored4.dll debug/QtGuid4.dll
} else:CONFIG(release, debug|release) {
QtCore4.commands = copy /Y %QTDIR%\\bin\\QtCore4.dll release
QtCore4.target = release/QtCore4.dll
QtGui4.commands = copy /Y %QTDIR%\\bin\\QtGui4.dll release
QtGui4.target = release/QtGui4.dll
QMAKE_EXTRA_TARGETS += QtCore4 QtGui4
PRE_TARGETDEPS += release/QtCore4.dll release/QtGui4.dll
} else {
error(Unknown set of dependencies.)
}
Here's some of what I don't like about it:
I'll accept another answer if somebody can clean this up a good bit, for example by shortening it and/or addressing some of my concerns, or just finding a better way in general.