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Whole document tree             bbuf.c File Reference Functions wmf_error_t  wmf_bbuf_input (wmfAPI *API, wmfRead fp_read, wmfSeek fp_seek, wmfTell fp_tell, void *user_data) wmf_error_t  wmf_file_open (wmfAPI *API, const char *file) wmf_error_t  wmf_file_close (wmfAPI *API) int  wmf_file_read (void *user_data) int  wmf_file_seek (void *user_data, long pos) long  wmf_file_tell (void *user_data) wmf_error_t  wmf_mem_open (wmfAPI *API, unsigned char *mem, long length) wmf_error_t  wmf_mem_close (wmfAPI *API) int  wmf_mem_read (void *user_data) int  wmf_mem_seek (void *user_data, long pos) long  wmf_mem_tell (void *user_data) Function Documentation wmf_error_t wmf_bbuf_input (  wmfAPI * API, wmfRead fp_read, wmfSeek fp_seek, wmfTell fp_tell, void * user_data )    Set custom metafile input-stream handler functions. Parameters: API   the API handle fp_read   function to read a byte fp_seek   function to set position fp_tell   function to get position user_data   handle for user data libwmf has simple methods for reading either from file or from memory, but many applications will want to use customized variants of these. wmf_bbuf_input() enables this. typedef int (*wmfRead) (void* user_data); typedef int (*wmfSeek) (void* user_data,long position); typedef long (*wmfTell) (void* user_data); wmfRead returns unsigned char cast to int, or EOF (cf. fgetc()) wmfSeek returns (-1) on error, otherwise 0 (cf. fseek()) wmfTell returns (-1) on error, otherwise current position (cf. ftell()) Returns: Returns the library error state (wmf_E_None on success). Possible library error state of wmf_E_Glitch, if any of the three functions is zero. wmf_error_t wmf_file_close (  wmfAPI * API )    Close metafile input file stream. Parameters: API   the API handle Returns: Returns the library error state (wmf_E_None on success). Possible library error state of wmf_E_Glitch. wmf_error_t wmf_file_open (  wmfAPI * API, const char * file )    Open file as metafile. Parameters: API   the API handle file   file name Simple method for reading from file. Returns: Returns the library error state (wmf_E_None on success). Possible library error states of wmf_E_Glitch or wmf_E_BadFile. int wmf_file_read (  void * user_data )    For internal use only. int wmf_file_seek (  void * user_data, long pos )    For internal use only. long wmf_file_tell (  void * user_data )    For internal use only. wmf_error_t wmf_mem_close (  wmfAPI * API )    Close metafile input memory stream. Parameters: API   the API handle Returns: Returns the library error state (wmf_E_None on success). wmf_error_t wmf_mem_open (  wmfAPI * API, unsigned char * mem, long length )    Open metafile in memory. Parameters: API   the API handle mem   the metafile in memory length   the length in bytes of metafile data Simple method for reading from memory as array of unsigned char. Returns: Returns the library error state (wmf_E_None on success). Possible library error state of wmf_E_Glitch. int wmf_mem_read (  void * user_data )    For internal use only. int wmf_mem_seek (  void * user_data, long pos )    For internal use only. long wmf_mem_tell (  void * user_data )    For internal use only.