{"record":{"id":"d14d4c213428a713","repo":"Yalantis/uCrop","slug":"load-rgba-specified-filename-is-null","errorCode":null,"errorMessage":"load_rgba(): Specified filename is (null).","messagePattern":"load_rgba\\(\\): Specified filename is \\(null\\)\\.","errorType":"exception","errorClass":"CImgArgumentException","httpStatus":null,"severity":"error","filePath":"ucrop/src/main/jni/CImg.h","lineNumber":57925,"sourceCode":"    //! Load image from a RGBA file \\newinstance.\n    static CImg<T> get_load_rgba(const char *const filename, const unsigned int dimw, const unsigned int dimh=1) {\n      return CImg<T>().load_rgba(filename,dimw,dimh);\n    }\n\n    //! Load image from a RGBA file \\overloading.\n    CImg<T>& load_rgba(std::FILE *const file, const unsigned int dimw, const unsigned int dimh=1) {\n      return _load_rgba(file,0,dimw,dimh);\n    }\n\n    //! Load image from a RGBA file \\newinstance.\n    static CImg<T> get_load_rgba(std::FILE *const file, const unsigned int dimw, const unsigned int dimh=1) {\n      return CImg<T>().load_rgba(file,dimw,dimh);\n    }\n\n    CImg<T>& _load_rgba(std::FILE *const file, const char *const filename,\n                        const unsigned int dimw, const unsigned int dimh) {\n      if (!file && !filename)\n        throw CImgArgumentException(_cimg_instance\n                                    \"load_rgba(): Specified filename is (null).\",\n                                    cimg_instance);\n\n      if (!dimw || !dimh) return assign();\n      const longT cimg_iobuffer = (longT)24*1024*1024;\n      std::FILE *const nfile = file?file:cimg::fopen(filename,\"rb\");\n      CImg<ucharT> raw;\n      assign(dimw,dimh,1,4);\n      T\n        *ptr_r = data(0,0,0,0),\n        *ptr_g = data(0,0,0,1),\n        *ptr_b = data(0,0,0,2),\n        *ptr_a = data(0,0,0,3);\n      for (longT to_read = (longT)size(); to_read>0; ) {\n        raw.assign(std::min(to_read,cimg_iobuffer));\n        cimg::fread(raw._data,raw._width,nfile);\n        to_read-=raw._width;\n        const unsigned char *ptrs = raw._data;","sourceCodeStart":57907,"sourceCodeEnd":57943,"githubUrl":"https://github.com/Yalantis/uCrop/blob/f788b534b48c144edf786c8cddbf0e029e637804/ucrop/src/main/jni/CImg.h#L57907-L57943","documentation":"CImg<T>::_load_rgba() reads raw interleaved RGBA bytes and, like load_rgb, requires either an open FILE* or a non-null filename. When both are null it throws CImgArgumentException before any I/O, since there is no source to read from.","triggerScenarios":"Calling load_rgba(nullptr, w, h); passing a NULL filename from a failed config/env lookup; using the FILE*-overload with an unopened or already-closed FILE* set to NULL.","commonSituations":"Texture-loading pipelines where the asset path is optional and unset; uninitialized filename pointers; refactor changed the call from filename-overload to FILE*-overload without opening the file.","solutions":["Provide a valid filename: img.load_rgba(\"sprite.rgba\", w, h).","Open the file and pass the FILE*: fopen + load_rgba(f, w, h) + fclose.","Guard against a null path before calling and log a meaningful error.","Verify the configuration actually provides the RGBA asset path.","Catch CImgArgumentException when the asset is optional and fall back to a default texture."],"exampleFix":"// before\nconst char* tex = cfg.get(\"texture\"); // NULL when key missing\nimg.load_rgba(tex, 256, 256);\n// after\nconst char* tex = cfg.get(\"texture\");\nif (tex) img.load_rgba(tex, 256, 256);\nelse img.load_rgba(\"default.rgba\", 256, 256);","handlingStrategy":"type-guard","validationCode":"if (path == nullptr || path[0] == '\\0') {\n  throw std::invalid_argument(\"RGBA path must be set before load_rgba\");\n}","typeGuard":"bool hasSource(std::FILE* f, const char* name) { return f != nullptr || name != nullptr; }","tryCatchPattern":"try {\n  img.load_rgba(path, dimw, dimh);\n} catch (cimg_library::CImgArgumentException& e) {\n  std::cerr << \"No RGBA source given: \" << e.what() << \"\\n\";\n  img.assign(); // fall back to empty/default image\n}","preventionTips":["Guard optional asset paths before calling load_rgba","Open FILE* handles before FILE*-overload calls","Set a default texture path when config lookup fails","Use std::string and .c_str() instead of possibly-NULL char*"],"tags":["cimg","raw-rgba","null-argument","image-loading"],"backgroundTag":"null-argument","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"}