QImage : trouble with save() method

[krivenok]

Hello All!

Consider the following simple code example
//////////////////////////////////////////////////////////////////////
#include<QtGui>

int main(int argc, char** argv)
{
QImage img("1.png","png");
assert(img.save("1.jpg","jpg")); // BOOM
//assert(img.save("1.jpeg","jpeg")); // BOOM
//assert(img.save("2.png","png")); // Works fine
}
//////////////////////////////////////////////////////////////////////

Can I save my image as JPEG???

P.S.
QT-4.0.1
MinGW gcc-3.4

[zlatko]

JPEG is comercial format you havent support it in free windows version of qt library

[jacek]

Can I save my image as JPEG???

Make sure you have compiled Qt with JPEG support (configure -qt-libjpeg or configure -system-libjpeg). There should be qjpeg1.dll and libqjpeg1.a in %QTDIR%\plugins\imageformats.

JPEG is comercial format you havent support it in free windows version of qt library

What makes you think so?

[krivenok]

My %QTDIR%\plugins\imageformats
-rw-r--r-- 1 krivenok Administ 2150 Feb 21 22:05 libqjpeg1.a
-rw-r--r-- 1 krivenok Administ 2160 Feb 21 22:05 libqjpegd1.a
-rw-r--r-- 1 krivenok Administ 2146 Feb 21 22:06 libqmng1.a
-rw-r--r-- 1 krivenok Administ 2150 Feb 21 22:05 libqmngd1.a
-rwxr-xr-x 1 krivenok Administ 152576 Feb 21 22:05 qjpeg1.dll
-rwxr-xr-x 1 krivenok Administ 924773 Feb 21 22:05 qjpegd1.dll
-rwxr-xr-x 1 krivenok Administ 311808 Feb 21 22:06 qmng1.dll
-rwxr-xr-x 1 krivenok Administ 1385962 Feb 21 22:05 qmngd1.dll

[jacek]

What does QImageWriter::supportedImageFormats() return?

[krivenok]

It returns:
bmp
png
ppm
xbm
xpm

[krivenok]

Maybe JPEG plugin is unavailable?

[zlatko]

What makes you think so?

It was in interesing arhive for qt3 windows non comercial

http://lists.trolltech.com/qt-intere...ad00008-0.html

[krivenok]

Date of message : Sun, 1 Jul 2001

[zlatko]

Date of message : Sun, 1 Jul 2001

Yes but i dont think that licensed policy changed frequently

ps. it just IMHO...i actually never try use win free version

[jacek]

It returns:
bmp
png
ppm
xbm
xpm

Strange, I have Qt 4.1.2 and this list also includes "jpeg" and "jpg". Try to copy that qjpeg1.dll to a "imageformats" subdirectory in the directory where your executable is.

[krivenok]

Strange, I have Qt 4.1.2 and this list also includes "jpeg" and "jpg". Try to copy that qjpeg1.dll to a "imageformats" subdirectory in the directory where your executable is.

No effect

[jacek]

No effect

For some reason it doesn't like that plugin. How did you install Qt?