马春杰杰
编译光流图color_flow打开程序的时候，出现错误：
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$ make g++ -O3 -W -Wall -c -o Convert.o Convert.cpp g++ -O3 -W -Wall -c -o Convolve.o Convolve.cpp g++ -O3 -W -Wall -c -o Image.o Image.cpp g++ -O3 -W -Wall -c -o ImageIO.o ImageIO.cpp ImageIO.cpp: In function ‘void ReadFileTGA(CByteImage&, const char*)’: ImageIO.cpp:169:9: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if (h.cMapBits != 24) ^~ ImageIO.cpp:171:6: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ int l = fileBytes * cMapSize; ^~~ ImageIO.cpp: In function ‘void ReadFilePGM(CByteImage&, const char*)’: ImageIO.cpp:358:5: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if (stream == 0) ^~ ImageIO.cpp:361:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ int width, height, nBands; ^~~ ImageIO.cpp: In function ‘void read_header(FILE*, const char*, char, char, int*, int*, int*, int)’: ImageIO.cpp:334:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp, "%d", width); ^ ImageIO.cpp:336:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp, "%d", height); ^ ImageIO.cpp:339:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp, "%d", nbands); ^ g++ -O3 -W -Wall -c -o ImageIOpng.o ImageIOpng.cpp ImageIOpng.cpp:19:17: fatal error: png.h: No such file or directory #include "png.h" ^ compilation terminated. <builtin>: recipe for target 'ImageIOpng.o' failed make: *** [ImageIOpng.o] Error 1 |
问题出现在环境上，主要是依赖包没有安装，使用以下命令安装即可：
Centos：
sudo yum install libpng-devel
Ubuntu：
sudo apt install libpng-dev
本文最后更新于2021年8月15日，已超过 1 年没有更新，如果文章内容或图片资源失效，请留言反馈，我们会及时处理，谢谢！
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