issues with QImage on different computers

**musikit** · 16th November 2007, 18:18

hello,

i use QImage in the application im building and we have noticed that some JPG and GIF images work perfectly on some machines but don't work on others. we have no indication of why the image doesnt work however the OS and other programs display the image 100% correct however Qt will sometimes return isValid() as false for the image.

i was just wondering if anyone had seen this before and knew a possible work around or detection scheme other then to try and load and check isValid() to see if the image would work?

thank you very much

**jpn** · 16th November 2007, 19:12

Which platform? Most likely you forgot to deploy JPEG plugin.

**musikit** · 16th November 2007, 19:17

windows.

i ship QtCore4 QtGui4 QtSvg4 and QtXml4 (all .dll) with my application. some pcs have 0 problems others can get most jpg/gif images but have issues with others. i have found no correlation between machines or images.

**jpn** · 16th November 2007, 19:40

Take a look at <QTDIR>\plugins\imageformats. Take all the needed image format plugins and deploy them with your application in imageformats-subdir related to application executable. For example:

C:\app\app.exe
C:\app\imageformats\qjpeg.dll

**musikit** · 16th November 2007, 20:06

jpn,

thank you very much. i did not know i needed to include these dll files. since i dont link with them and the dependency finder did not find them.