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News Overview Download Order F.A.Q. More info Support Links Welcome QuickStart ActiveX Control C++ Wrapper J2K_Image open easyDecode selectTiles getMetaData decode close J2K_Frames open getFrames getFrame operators close API Reference General getVersion getLastError getErrorStr getLastErrorStr Unlock Open / Close •Open Close Info GetInfo GetInfoEx GetResolutions GetResDimensions GetMetaData Decoding EasyDecode SelectTiles Decode Cancel Debug StartLogging StopLogging |
J2K_Open Use this function to create an internal object, associated with a file, memory buffer or custom data source.
void* J2K_OpenFile(const char *filename); Parameters src_buffer Pointer to a memory buffer, which contains a JPEG 2000 file. src_size Size of data in the memory buffer (in bytes). data_source Pointer to a data source identifier to be passed to callback routines unchanged. See "Custom Data Sources" section for more information. cbs Pointer to a special structure with callbacks. See "Custom Data Sources" section for more information.
Return value Returns pointer to an internal object, associated with a file, memory buffer, custom data source, or 0 if there was an error. Use J2K_getLastError() to obtain the error code. Notes 1. The internal object, created by this function is initially "blank". No significant memory is allocated. This allows to get information about a J2K image in relatively cheap way if that's the only thing you need. 2. Every image, opened with this function, must be closed with J2K_Close() to avoid memory leaks. 3. If you are programming in C++ you can use overloaded function J2K_Open(). Example
void *image = J2K_Open("test.j2k"); J2K_Close() Custom data sources |
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