{"record":{"id":"7bdf92d100200f75","repo":"Yalantis/uCrop","slug":"load-failed-to-open-file-s","errorCode":null,"errorMessage":"load(): Failed to open file '%s'.","messagePattern":"load\\(\\): Failed to open file '(.+?)'\\.","errorType":"exception","errorClass":"CImgIOException","httpStatus":null,"severity":"error","filePath":"ucrop/src/main/jni/CImg.h","lineNumber":56582,"sourceCode":"                 !cimg::strcasecmp(ext,\"ogm\") ||\n                 !cimg::strcasecmp(ext,\"ogg\") ||\n                 !cimg::strcasecmp(ext,\"ogv\") ||\n                 !cimg::strcasecmp(ext,\"qt\") ||\n                 !cimg::strcasecmp(ext,\"rm\") ||\n                 !cimg::strcasecmp(ext,\"vob\") ||\n                 !cimg::strcasecmp(ext,\"webm\") ||\n                 !cimg::strcasecmp(ext,\"wmv\") ||\n                 !cimg::strcasecmp(ext,\"xvid\") ||\n                 !cimg::strcasecmp(ext,\"mpeg\")) load_video(filename);\n        else is_loaded = false;\n      } catch (CImgIOException&) { is_loaded = false; }\n\n      // If nothing loaded, try to guess file format from magic number in file.\n      if (!is_loaded) {\n        std::FILE *file = cimg::std_fopen(filename,\"rb\");\n        if (!file) {\n          cimg::exception_mode(omode);\n          throw CImgIOException(_cimg_instance\n                                \"load(): Failed to open file '%s'.\",\n                                cimg_instance,\n                                filename);\n        }\n\n        const char *const f_type = cimg::ftype(file,filename);\n        cimg::fclose(file);\n        is_loaded = true;\n        try {\n          if (!cimg::strcasecmp(f_type,\"pnm\")) load_pnm(filename);\n          else if (!cimg::strcasecmp(f_type,\"pfm\")) load_pfm(filename);\n          else if (!cimg::strcasecmp(f_type,\"bmp\")) load_bmp(filename);\n          else if (!cimg::strcasecmp(f_type,\"inr\")) load_inr(filename);\n          else if (!cimg::strcasecmp(f_type,\"jpg\")) load_jpeg(filename);\n          else if (!cimg::strcasecmp(f_type,\"pan\")) load_pandore(filename);\n          else if (!cimg::strcasecmp(f_type,\"png\")) load_png(filename);\n          else if (!cimg::strcasecmp(f_type,\"tif\")) load_tiff(filename);\n          else if (!cimg::strcasecmp(f_type,\"gif\")) load_gif_external(filename);","sourceCodeStart":56564,"sourceCodeEnd":56600,"githubUrl":"https://github.com/Yalantis/uCrop/blob/f788b534b48c144edf786c8cddbf0e029e637804/ucrop/src/main/jni/CImg.h#L56564-L56600","documentation":"CImg<T>::load() failed to open the given file via std_fopen because it does not exist, is unreadable, or the path is wrong. This is a generic entry-point loader in the vendored CImg.h (bundled with uCrop's JNI build) that tries multiple format-specific loaders; the very first step is opening the file, and failure is reported with CImgIOException.","triggerScenarios":"Calling img.load(filename) (or load_cimg/load_other paths) where std_fopen(filename,\"rb\") returns NULL: file missing, wrong working directory, no read permission, or filename is an empty/garbage string.","commonSituations":"Passing an Android content:// or relative path instead of an absolute filesystem path in JNI code; file deleted between check and load; typo in extension/path; storage permission missing so the file simply cannot be opened.","solutions":["Verify the file exists and is readable at the exact absolute path passed (std::FILE *f=std::fopen(path,\"rb\"); f?fclose(f):log error).","Convert Android URIs to a real file path (or copy to app cache) before handing the char* to CImg.","Check POSIX permissions and SELinux/storage permissions for the process.","Load from an in-memory buffer or std::FILE* you already opened instead of a filename."],"exampleFix":"// before\nimg.load(\"photo.png\");\n// after\nstd::FILE *f = std::fopen(\"/sdcard/photo.png\", \"rb\");\nif (!f) { /* handle missing file */ }\nelse { fclose(f); img.load(\"/sdcard/photo.png\"); }","handlingStrategy":"try-catch","validationCode":"bool fileReadable(const char* p){ if(!p||!*p) return false; std::FILE* f=std::fopen(p,\"rb\"); if(!f) return false; std::fclose(f); return true; }","typeGuard":null,"tryCatchPattern":"try { img.load(path); } catch (cimg_library::CImgIOException& e) { // file could not be opened: check path/permissions\n  log(\"CImg load failed: %s\", e.what()); }","preventionTips":["Always use absolute paths in JNI/Android code","Check file existence and readability with fopen before load","Handle Android content:// URIs by copying to a real file first","Verify storage permissions at runtime"],"tags":["cimg","file-io","jni","image-loading"],"backgroundTag":"file-not-found","analyzedSha":"f788b534b48c144edf786c8cddbf0e029e637804","analyzedAt":"2026-09-08T08:36:04.887Z","contentChangedAt":"2026-09-08T08:36:04.887Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}