undefined reference to ..... errors

Hi, I'm new developper with c++ under Linux with Eclipse, my program use FreeImagePlus library to read images. Although I write include "FreeImagePlus" , I still have many errors :

g++ -o exe lets_ocr.cpp /tmp/ccS3vADI.o: In function main': lets_ocr.cpp: (.text+0x484): undefined reference to fipImage::fipImage(FREE_IMAGE_TYPE, unsigned short, unsigned short, unsigned short)' lets_ocr.cpp: (.text+0x4a4): undefined reference to fipImage::load(char const*, int)' lets_ocr.cpp: (.text+0x4f8 ) : undefined reference to fipImage::getBitsPerPixel() const' lets_ocr.cpp: (.text+0x545): undefined reference to fipImage::getHeight() const' lets_ocr.cpp: (.text+0x55c): undefined reference to fipImage::getWidth() const' lets_ocr.cpp: (.text+0x5df): undefined reference to fipImage::getScanWidth() const' lets_ocr.cpp: (.text+0x62c): undefined reference to fipImage::getScanWidth() const' lets_ocr.cpp: (.text+0x643): undefined reference to fipImage::getHeight() const' lets_ocr.cpp: (.text+0x65a): undefined reference to fipImage::accessPixels() const' lets_ocr.cpp: (.text+0x9d9): undefined reference to fipImage::getBitsPerPixel() const' lets_ocr.cpp: (.text+0xa5d): undefined reference to fipImage::getBitsPerPixel() const' lets_ocr.cpp: (.text+0xcf9): undefined reference to fipImage::~fipImage()' lets_ocr.cpp: (.text+0xd15): undefined reference to fipImage::~fipImage()'

:confused: Can some one help me please. thank you in advance.

Those look like linking errors, you need to tell the compiler to link your program to the FreeImage library with something like;

-lfreeimage

Hi, Thank you for reply, this problem is solved, but I find other errors:

[COLOR=Blue]FreeImagePlus.h:72: warning: data definition has no type or storage class FreeImagePlus.h:72: error: expected ‘,’ or ‘;’ before ‘fipObject’ FreeImagePlus.h:81: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fipMemoryIO’ FreeImagePlus.h:82: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fipMultiPage’ FreeImagePlus.h:83: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fipTag’ FreeImagePlus.h:85: warning: data definition has no type or storage class FreeImagePlus.h:85: error: expected ‘,’ or ‘;’ before ‘fipImage’ FreeImagePlus.h:340: warning: data definition has no type or storage class FreeImagePlus.h:340: error: expected ‘,’ or ‘;’ before ‘fipMemoryIO’ FreeImagePlus.h:374: warning: data definition has no type or storage class FreeImagePlus.h:374: error: expected ‘,’ or ‘;’ before ‘fipMultiPage’ FreeImagePlus.h:412: warning: data definition has no type or storage class FreeImagePlus.h:412: error: expected ‘,’ or ‘;’ before ‘fipTag’ FreeImagePlus.h:453: warning: data definition has no type or storage class FreeImagePlus.h:453: error: expected ‘,’ or ‘;’ before ‘fipMetadataFind’[/COLOR]

I copy here this lines : [COLOR=Black] [/COLOR][COLOR=Blue][COLOR=Black]72 : [/COLOR][COLOR=Black]class FIP_API fipObject 81 class fipMemoryIO; 82 class fipMultiPage; 83 class fipTag; 85 [/COLOR][COLOR=Black]class FIP_API fipImage : public fipObject 340 class FIP_API fipMemoryIO : public fipObject 374 class FIP_API fipMultiPage : public fipObject 412 class FIP_API fipTag : public fipObject 453 class FIP_API fipMetadataFind : public fipObject

what do you think? Thank you again [/COLOR][/COLOR]

Hi, I try to understand those error I add the library "FreeImage.h" to the folder "c++"

g++ -o lets_ocr lets_ocr.cpp -l FreeImage.h

but I still have error :

/usr/bin/ld: cannot find -l-xc++-header collect2: ld returned 1 exit status

what do you think? thanks