标题:急！ｊｐｅｇ库的问题！
作者:youbug
日期:2008-05-12 16:15
内容:
我原先在pxa255上实现了摄像头显示的程序，也就是ｖ４ｌ应用程序的实现
编译了一个ｊｐｅｇ库，
比如我编译vidcat_OK_1.c（里面有put_image_jpeg（））可以象下面那样
# arm-linux-gccvidcat_OK_1.c -ljpeg
编译可以下到板子里面可以显示摄像头采集的视频。
现在我做了一个ｑｔ的界面主要显示采集的视频（.ｊｐｇ格式），
把ｖｉｄｃａｔ＿ＯＫ＿１．ｃ的函数做为ｓｌｏｔｓ的一部分，
但是编译的时候总是出错，
错误如下：
video.o(.text+0xe00): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_std_error(jpeg_error_mgr*)'
video.o(.text+0xe18): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_CreateCompress(jpeg_compress_struct*, int, unsigned int)'
video.o(.text+0xe44): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_set_defaults(jpeg_compress_struct*)'
video.o(.text+0xe54): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_set_quality(jpeg_compress_struct*, int, int)'
video.o(.text+0xe68): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_stdio_dest(jpeg_compress_struct*, _IO_FILE*)'
video.o(.text+0xe74): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_start_compress(jpeg_compress_struct*, int)'
video.o(.text+0xedc): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_write_scanlines(jpeg_compress_struct*, unsigned char**, unsigned int)'
video.o(.text+0xef0): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_finish_compress(jpeg_compress_struct*)'
video.o(.text+0xef8): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_destroy_compress(jpeg_compress_struct*)'
video.o(.text+0xf ..
#1 [shiroki 05-13 11:38]
错误信息贴的不全。 看看前面编译的命令行里有-ljpeg吗？ qte库编译的时候configure加-system-jpeg选项，qte库就会自动和jpeg库链接-- 前提是你的toolchain里有交叉编译好的jpeg库。 你编译好qte库之后用ldd libqte.so看一下是不是链接上了libjpeg
#2 [youbug 05-13 16:35]
好的谢谢，toolchain里已经有交叉编译好的jpeg库。
好像是ｑｔｅ编译的时候没有加－ｓｙｓtem-jpeg
#3 [youbug 05-13 16:36]
qtopia-core
默认安装都包含那些库啊
#4 [youbug 05-15 16:45]
我加了－ｓｙｓｔｅｍ－ｌｉｂｊｐｅｇ
然后在#qmake -project 生成的 .pro
文件里面加入LIBS += -ljpeg -L/usr/local/arm/3.4.1/lib
还是出错啊！！求各位在给我说说！！
出错如下：
arm-linux-g++ -Wl,-rpath,/usr/local/Trolltech/QtopiaCore-4.2.2-arm/lib -o capture capture.o main.o video.o moc_video.o -L/usr/local/Trolltech/QtopiaCore-4.2.2-arm/lib -ljpeg -L/usr/local/arm/3.4.1/lib -lQtGui -L/tmp/qtopia-core-opensource-src-4.2.2/lib -lQtNetwork -lQtCore -lm -ldl -lpthread
video.o(.text+0xe00): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_std_error(jpeg_error_mgr*)'
video.o(.text+0xe18): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_CreateCompress(jpeg_compress_struct*, int, unsigned int)'
video.o(.text+0xe44): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_set_defaults(jpeg_compress_struct*)'
video.o(.text+0xe54): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_set_quality(jpeg_compress_struct*, int, int)'
video.o(.text+0xe68): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_stdio_dest(jpeg_compress_struct*, _IO_FILE*)'
video.o(.text+0xe74): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_start_compress(jpeg_compress_struct*, int)'
video.o(.text+0xedc): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_write_scanlines(jpeg_compress_struct*, unsigned char**, unsigned int)'
video.o(.text+0xef0): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to `jpeg_finish_compress(jpeg_compress_struct*)'
video.o(.text+0xef8): In function `put_image_jpeg(_IO_FILE*, char*, int, int, int, int)':
: undefined reference to..