| 1 | \section{\class{wxExpr}}\label{wxexpr} |
| 2 | |
| 3 | The {\bf wxExpr} class is the building brick of expressions similar to Prolog |
| 4 | clauses, or objects. It can represent an expression of type long integer, float, string, word, |
| 5 | or list, and lists can be nested. |
| 6 | |
| 7 | \wxheading{Derived from} |
| 8 | |
| 9 | None |
| 10 | |
| 11 | \wxheading{Include files} |
| 12 | |
| 13 | <wx/wxexpr.h> |
| 14 | |
| 15 | \wxheading{See also} |
| 16 | |
| 17 | \helpref{wxExpr overview}{exproverview}, \helpref{wxExprDatabase}{wxexprdatabase} |
| 18 | |
| 19 | \latexignore{\rtfignore{\wxheading{Members}}} |
| 20 | |
| 21 | \membersection{wxExpr::wxExpr}\label{wxexprconstr} |
| 22 | |
| 23 | \func{}{wxExpr}{\param{const wxString\&}{functor}} |
| 24 | |
| 25 | Construct a new clause with this form, supplying the functor name. A clause is an object |
| 26 | that will appear in the data file, with a list of attribute/value pairs. |
| 27 | |
| 28 | \func{}{wxExpr}{\param{wxExprType}{ type}, \param{const wxString\&}{ wordOrString = ``"}} |
| 29 | |
| 30 | Construct a new empty list, or a word (will be output with no quotes), or a string, depending on the |
| 31 | value of {\it type}. |
| 32 | |
| 33 | {\it type} can be {\bf wxExprList}, {\bf wxExprWord}, or {\bf wxExprString}. If {\it type} is wxExprList, |
| 34 | the value of {\it wordOrString} will be ignored. |
| 35 | |
| 36 | \func{}{wxExpr}{\param{long}{ value}} |
| 37 | |
| 38 | Construct an integer expression. |
| 39 | |
| 40 | \func{}{wxExpr}{\param{float}{ value}} |
| 41 | |
| 42 | Construct a floating point expression. |
| 43 | |
| 44 | \func{}{wxExpr}{\param{wxList* }{value}} |
| 45 | |
| 46 | Construct a list expression. The list's nodes' data should |
| 47 | themselves be {\bf wxExpr}s. |
| 48 | |
| 49 | wxExpr no longer uses the {\bf wxList} internally, |
| 50 | so this constructor turns the list into its internal |
| 51 | format (assuming a non-nested list) and then deletes the supplied |
| 52 | list. |
| 53 | |
| 54 | \membersection{wxExpr::\destruct{wxExpr}} |
| 55 | |
| 56 | \func{}{\destruct{wxExpr}}{\void} |
| 57 | |
| 58 | Destructor. |
| 59 | |
| 60 | \membersection{wxExpr::AddAttributeValue}\label{wxexpraddattributevalue} |
| 61 | |
| 62 | Use these on clauses ONLY. Note that the functions for adding strings |
| 63 | and words must be differentiated by function name which is why |
| 64 | they are missing from this group (see \helpref{wxExpr::AddAttributeValueString}{wxexpraddattributevaluestring} and |
| 65 | \rtfsp\helpref{wxExpr::AddAttributeValueWord}{wxexpraddattributevalueword}). |
| 66 | |
| 67 | \func{void}{AddAttributeValue}{\param{const wxString\&}{ attribute}, \param{float }{value}} |
| 68 | |
| 69 | Adds an attribute and floating point value pair to the clause. |
| 70 | |
| 71 | \func{void}{AddAttributeValue}{\param{const wxString\&}{ attribute}, \param{long }{value}} |
| 72 | |
| 73 | Adds an attribute and long integer value pair to the clause. |
| 74 | |
| 75 | \func{void}{AddAttributeValue}{\param{const wxString\&}{ attribute}, \param{wxList* }{value}} |
| 76 | |
| 77 | Adds an attribute and list value pair to the clause, converting the list into |
| 78 | internal form and then deleting {\bf value}. Note that the list should not contain |
| 79 | nested lists (except if in internal {\bf wxExpr} form.) |
| 80 | |
| 81 | \func{void}{AddAttributeValue}{\param{const wxString\&}{ attribute}, \param{wxExpr* }{value}} |
| 82 | |
| 83 | Adds an attribute and wxExpr value pair to the clause. Do not delete\rtfsp |
| 84 | {\it value} once this function has been called. |
| 85 | |
| 86 | \membersection{wxExpr::AddAttributeValueString}\label{wxexpraddattributevaluestring} |
| 87 | |
| 88 | \func{void}{AddAttributeValueString}{\param{const wxString\&}{ attribute}, \param{const wxString\&}{ value}} |
| 89 | |
| 90 | Adds an attribute and string value pair to the clause. |
| 91 | |
| 92 | \membersection{wxExpr::AddAttributeValueStringList}\label{wxexpraddattributevaluestringlist} |
| 93 | |
| 94 | \func{void}{AddAttributeValueStringList}{\param{const wxString\&}{ attribute}, \param{wxList* }{value}} |
| 95 | |
| 96 | Adds an attribute and string list value pair to the clause. |
| 97 | |
| 98 | Note that the list passed to this function is a list of strings, NOT a list |
| 99 | of {\bf wxExpr}s; it gets turned into a list of {\bf wxExpr}s |
| 100 | automatically. This is a convenience function, since lists of strings |
| 101 | are often manipulated in C++. |
| 102 | |
| 103 | \membersection{wxExpr::AddAttributeValueWord}\label{wxexpraddattributevalueword} |
| 104 | |
| 105 | \func{void}{AddAttributeValueWord}{\param{const wxString\&}{ attribute}, \param{const wxString\&}{ value}} |
| 106 | |
| 107 | Adds an attribute and word value pair to the clause. |
| 108 | |
| 109 | \membersection{wxExpr::Append}\label{wxexprappend} |
| 110 | |
| 111 | \func{void}{Append}{\param{wxExpr*}{ value}} |
| 112 | |
| 113 | Append the {\bf value} to the end of the list. `this' must be a list. |
| 114 | |
| 115 | \membersection{wxExpr::Arg}\label{wxexprarg} |
| 116 | |
| 117 | \constfunc{wxExpr* }{Arg}{\param{wxExprType}{ type}, \param{int}{ n}} |
| 118 | |
| 119 | Get nth arg of the given clause (starting from 1). NULL is returned if |
| 120 | the expression is not a clause, or {\it n} is invalid, or the given type |
| 121 | does not match the actual type. See also \helpref{wxExpr::Nth}{wxexprnth}. |
| 122 | |
| 123 | \membersection{wxExpr::Insert}\label{wxexprinsert} |
| 124 | |
| 125 | \func{void}{Insert}{\param{wxExpr* }{value}} |
| 126 | |
| 127 | Insert the {\bf value} at the start of the list. `this' must be a list. |
| 128 | |
| 129 | \membersection{wxExpr::GetAttributeValue}\label{wxexprgetattributevalue} |
| 130 | |
| 131 | These functions are the easiest way to retrieve attribute values, by |
| 132 | passing a pointer to variable. If the attribute is present, the |
| 133 | variable will be filled with the appropriate value. If not, the |
| 134 | existing value is left alone. This style of retrieving attributes |
| 135 | makes it easy to set variables to default values before calling these |
| 136 | functions; no code is necessary to check whether the attribute is |
| 137 | present or not. |
| 138 | |
| 139 | \constfunc{bool}{GetAttributeValue}{\param{const wxString\&}{ attribute}, \param{wxString\&}{ value}} |
| 140 | |
| 141 | Retrieve a string (or word) value. |
| 142 | |
| 143 | \constfunc{bool}{GetAttributeValue}{\param{const wxString\&}{ attribute}, \param{float\& }{value}} |
| 144 | |
| 145 | Retrieve a floating point value. |
| 146 | |
| 147 | \constfunc{bool}{GetAttributeValue}{\param{const wxString\&}{ attribute}, \param{int\& }{value}} |
| 148 | |
| 149 | Retrieve an integer value. |
| 150 | |
| 151 | \constfunc{bool}{GetAttributeValue}{\param{const wxString\&}{ attribute}, \param{long\& }{value}} |
| 152 | |
| 153 | Retrieve a long integer value. |
| 154 | |
| 155 | \constfunc{bool}{GetAttributeValue}{\param{const wxString\&}{ attribute}, \param{wxExpr**}{ value}} |
| 156 | |
| 157 | Retrieve a wxExpr pointer. |
| 158 | |
| 159 | \membersection{wxExpr::GetAttributeValueStringList}\label{wxexprgetattributestringlist} |
| 160 | |
| 161 | \constfunc{void}{GetAttributeValueStringList}{\param{const wxString\&}{attribute}, \param{wxList* }{value}} |
| 162 | |
| 163 | Use this on clauses ONLY. See above for comments on this style of |
| 164 | attribute value retrieval. This function expects to receive a pointer to |
| 165 | a new list (created by the calling application); it will append strings |
| 166 | to the list if the attribute is present in the clause. |
| 167 | |
| 168 | \membersection{wxExpr::AttributeValue}\label{wxexprattributevalue} |
| 169 | |
| 170 | \constfunc{wxExpr*}{AttributeValue}{\param{const wxString\&}{ word}} |
| 171 | |
| 172 | Use this on clauses ONLY. Searches the clause for an attribute |
| 173 | matching {\it word}, and returns the value associated with it. |
| 174 | |
| 175 | \membersection{wxExpr::Copy}\label{wxexprcopy} |
| 176 | |
| 177 | \constfunc{wxExpr*}{Copy}{\void} |
| 178 | |
| 179 | Recursively copies the expression, allocating new storage space. |
| 180 | |
| 181 | \membersection{wxExpr::DeleteAttributeValue}\label{wxexprdeletattributevalue} |
| 182 | |
| 183 | \func{void}{DeleteAttributeValue}{\param{const wxString\&}{ attribute}} |
| 184 | |
| 185 | Use this on clauses only. Deletes the attribute and its value (if any) from the |
| 186 | clause. |
| 187 | |
| 188 | \membersection{wxExpr::Functor}\label{wxexprfunctor} |
| 189 | |
| 190 | \constfunc{wxString}{Functor}{\void} |
| 191 | |
| 192 | Use this on clauses only. Returns the clause's functor (object name). |
| 193 | |
| 194 | \membersection{wxExpr::GetClientData}\label{wxexprgetclientdata} |
| 195 | |
| 196 | \constfunc{wxObject*}{GetClientData}{\void} |
| 197 | |
| 198 | Retrieve arbitrary data stored with this clause. This can be useful when |
| 199 | reading in data for storing a pointer to the C++ object, so when another |
| 200 | clause makes a reference to this clause, its C++ object can be retrieved. |
| 201 | See \helpref{wxExpr::SetClientData}{wxexprsetclientdata}. |
| 202 | |
| 203 | \membersection{wxExpr::GetFirst}\label{wxexprgetfirst} |
| 204 | |
| 205 | \constfunc{wxExpr*}{GetFirst}{\void} |
| 206 | |
| 207 | If this is a list expression (or clause), gets the first element in the list. |
| 208 | |
| 209 | See also \helpref{wxExpr::GetLast}{wxexprgetlast}, \helpref{wxExpr::GetNext}{wxexprgetnext}, \helpref{wxExpr::Nth}{wxexprnth}. |
| 210 | |
| 211 | \membersection{wxExpr::GetLast}\label{wxexprgetlast} |
| 212 | |
| 213 | \constfunc{wxExpr*}{GetLast}{\void} |
| 214 | |
| 215 | If this is a list expression (or clause), gets the last element in the list. |
| 216 | |
| 217 | See also \helpref{wxExpr::GetFirst}{wxexprgetfirst}, \helpref{wxExpr::GetNext}{wxexprgetnext}, \helpref{wxExpr::Nth}{wxexprnth}. |
| 218 | |
| 219 | \membersection{wxExpr::GetNext}\label{wxexprgetnext} |
| 220 | |
| 221 | \constfunc{wxExpr*}{GetNext}{\void} |
| 222 | |
| 223 | If this is a node in a list (any wxExpr may be a node in a list), gets the |
| 224 | next element in the list. |
| 225 | |
| 226 | See also \helpref{wxExpr::GetFirst}{wxexprgetfirst}, \helpref{wxExpr::GetLast}{wxexprgetlast}, \helpref{wxExpr::Nth}{wxexprnth}. |
| 227 | |
| 228 | \membersection{wxExpr::IntegerValue}\label{wxexprintegervalue} |
| 229 | |
| 230 | \constfunc{long}{IntegerValue}{\void} |
| 231 | |
| 232 | Returns the integer value of the expression. |
| 233 | |
| 234 | \membersection{wxExpr::Nth}\label{wxexprnth} |
| 235 | |
| 236 | \constfunc{wxExpr*}{Nth}{\param{int}{ n}} |
| 237 | |
| 238 | Get nth arg of the given list expression (starting from 0). NULL is returned if |
| 239 | the expression is not a list expression, or {\it n} is invalid. See also \helpref{wxExpr::Arg}{wxexprarg}. |
| 240 | |
| 241 | Normally, you would use attribute-value pairs to add and retrieve data |
| 242 | from objects (clauses) in a data file. However, if the data gets complex, |
| 243 | you may need to store attribute values as lists, and pick them apart |
| 244 | yourself. |
| 245 | |
| 246 | \membersection{wxExpr::RealValue}\label{wxexprrealvalue} |
| 247 | |
| 248 | \constfunc{float}{RealValue}{\void} |
| 249 | |
| 250 | Returns the floating point value of the expression. |
| 251 | |
| 252 | \membersection{wxExpr::SetClientData}\label{wxexprsetclientdata} |
| 253 | |
| 254 | \func{void}{SetClientData}{\param{wxObject *}{data}} |
| 255 | |
| 256 | Associate arbitrary data with this clause. This can be useful when |
| 257 | reading in data for storing a pointer to the C++ object, so when another |
| 258 | clause makes a reference to this clause, its C++ object can be retrieved. |
| 259 | See \helpref{wxExpr::GetClientData}{wxexprgetclientdata}. |
| 260 | |
| 261 | \membersection{wxExpr::StringValue}\label{wxexprstringvalue} |
| 262 | |
| 263 | \constfunc{wxString}{StringValue}{\void} |
| 264 | |
| 265 | Returns the string value of the expression. |
| 266 | |
| 267 | \membersection{wxExpr::Type}\label{wxexprtype} |
| 268 | |
| 269 | \constfunc{wxExprType}{Type}{\void} |
| 270 | |
| 271 | Returns the type of the expression. {\bf wxExprType} is defined as follows: |
| 272 | |
| 273 | \begin{verbatim} |
| 274 | typedef enum { |
| 275 | wxExprNull, |
| 276 | wxExprInteger, |
| 277 | wxExprReal, |
| 278 | wxExprWord, |
| 279 | wxExprString, |
| 280 | wxExprList |
| 281 | } wxExprType; |
| 282 | \end{verbatim} |
| 283 | |
| 284 | \membersection{wxExpr::WordValue}\label{wxexprwordvalue} |
| 285 | |
| 286 | \constfunc{wxString}{WordValue}{\void} |
| 287 | |
| 288 | Returns the word value of the expression. |
| 289 | |
| 290 | \membersection{wxExpr::WriteClause}\label{wxexprwriteprologclause} |
| 291 | |
| 292 | \func{void}{WriteClause}{\param{FILE *}{ stream}} |
| 293 | |
| 294 | Writes the clause to the given stream in Prolog format. Not normally needed, since |
| 295 | the whole {\bf wxExprDatabase} will usually be written at once. The format is: |
| 296 | functor, open parenthesis, list of comma-separated expressions, close parenthesis, |
| 297 | full stop. |
| 298 | |
| 299 | \membersection{wxExpr::WriteExpr}\label{wxexprwriteexpr} |
| 300 | |
| 301 | \func{void}{WriteExpr}{\param{FILE *}{ stream}} |
| 302 | |
| 303 | Writes the expression (not clause) to the given stream in Prolog |
| 304 | format. Not normally needed, since the whole {\bf wxExprDatabase} will |
| 305 | usually be written at once. Lists are written in square bracketed, |
| 306 | comma-delimited format. |
| 307 | |
| 308 | \membersection{Functions and macros} |
| 309 | |
| 310 | Below are miscellaneous functions and macros associated with wxExpr objects. |
| 311 | |
| 312 | \func{bool}{wxExprIsFunctor}{\param{wxExpr *}{expr}, \param{const wxString\&}{ functor}} |
| 313 | |
| 314 | Checks that the functor of {\it expr} is {\it functor}. |
| 315 | |
| 316 | \func{void}{wxExprCleanUp}{\void} |
| 317 | |
| 318 | Cleans up the wxExpr system (YACC/LEX buffers) to avoid memory-checking warnings as the program exits. |
| 319 | |
| 320 | \begin{verbatim} |
| 321 | #define wxMakeInteger(x) (new wxExpr((long)x)) |
| 322 | #define wxMakeReal(x) (new wxExpr((float)x)) |
| 323 | #define wxMakeString(x) (new wxExpr(PrologString, x)) |
| 324 | #define wxMakeWord(x) (new wxExpr(PrologWord, x)) |
| 325 | #define wxMake(x) (new wxExpr(x)) |
| 326 | \end{verbatim} |
| 327 | |
| 328 | Macros to help make wxExpr objects. |
| 329 | |
| 330 | \section{\class{wxExprDatabase}}\label{wxexprdatabase} |
| 331 | |
| 332 | The {\bf wxExprDatabase} class represents a database, or list, |
| 333 | of Prolog-like expressions. Instances of this class are used for reading, |
| 334 | writing and creating data files. |
| 335 | |
| 336 | \wxheading{Derived from} |
| 337 | |
| 338 | \helpref{wxList}{wxlist}\\ |
| 339 | \helpref{wxObject}{wxobject} |
| 340 | |
| 341 | \wxheading{See also} |
| 342 | |
| 343 | \helpref{wxExpr overview}{exproverview}, \helpref{wxExpr}{wxexpr} |
| 344 | |
| 345 | \latexignore{\rtfignore{\wxheading{Members}}} |
| 346 | |
| 347 | \membersection{wxExprDatabase::wxExprDatabase}\label{wxexprdatabaseconstr} |
| 348 | |
| 349 | \func{void}{wxExprDatabase}{\param{proioErrorHandler}{ handler = 0}} |
| 350 | |
| 351 | Construct a new, unhashed database, with an optional error handler. The |
| 352 | error handler must be a function returning a bool and taking an integer and a string |
| 353 | argument. When an error occurs when reading or writing a database, this function is |
| 354 | called. The error is given as the first argument (currently one of WXEXPR\_ERROR\_GENERAL, |
| 355 | WXEXPR\_ERROR\_SYNTAX) and an error message is given as the second argument. If false |
| 356 | is returned by the error handler, processing of the wxExpr operation stops. |
| 357 | |
| 358 | Another way of handling errors is simply to call \helpref{wxExprDatabase::GetErrorCount}{wxexprdatabasegeterrorcount} after |
| 359 | the operation, to check whether errors have occurred, instead of installing an error handler. |
| 360 | If the error count is more than zero, \helpref{wxExprDatabase::Write}{wxexprdatabasewrite} and |
| 361 | \rtfsp\helpref{wxExprDatabase::Read}{wxexprdatabaseread} will return false to |
| 362 | the application. |
| 363 | |
| 364 | For example: |
| 365 | |
| 366 | \begin{verbatim} |
| 367 | bool myErrorHandler(int err, chat *msg) |
| 368 | { |
| 369 | if (err == WXEXPR_ERROR_SYNTAX) |
| 370 | { |
| 371 | wxMessageBox(msg, "Syntax error"); |
| 372 | } |
| 373 | return false; |
| 374 | } |
| 375 | |
| 376 | wxExprDatabase database(myErrorHandler); |
| 377 | \end{verbatim} |
| 378 | |
| 379 | \func{}{wxExprDatabase}{\param{wxExprType}{ type}, \param{const wxString\&}{attribute}, |
| 380 | \rtfsp\param{int}{ size = 500}, \param{proioErrorHandler}{ handler = 0}} |
| 381 | |
| 382 | Construct a new database hashed on a combination of the clause functor and |
| 383 | a named attribute (often an integer identification). |
| 384 | |
| 385 | See above for an explanation of the error handler. |
| 386 | |
| 387 | \membersection{wxExprDatabase::\destruct{wxExprDatabase}} |
| 388 | |
| 389 | \func{}{\destruct{wxExprDatabase}}{\void} |
| 390 | |
| 391 | Delete the database and contents. |
| 392 | |
| 393 | \membersection{wxExprDatabase::Append}\label{wxexprdatabaseappend} |
| 394 | |
| 395 | \func{void}{Append}{\param{wxExpr* }{clause}} |
| 396 | |
| 397 | Append a clause to the end of the database. If the database is hashing, |
| 398 | the functor and a user-specified attribute will be hashed upon, giving the |
| 399 | option of random access in addition to linear traversal of the database. |
| 400 | |
| 401 | \membersection{wxExprDatabase::BeginFind}\label{wxexprdatabasebeginfind} |
| 402 | |
| 403 | \func{void}{BeginFind}{\void} |
| 404 | |
| 405 | Reset the current position to the start of the database. Subsequent |
| 406 | \rtfsp\helpref{wxExprDatabase::FindClause}{wxexprdatabasefindclause} calls will move the pointer. |
| 407 | |
| 408 | \membersection{wxExprDatabase::ClearDatabase}\label{wxexprdatabasecleardatabase} |
| 409 | |
| 410 | \func{void}{ClearDatabase}{\void} |
| 411 | |
| 412 | Clears the contents of the database. |
| 413 | |
| 414 | \membersection{wxExprDatabase::FindClause}\label{wxexprdatabasefindclause} |
| 415 | |
| 416 | Various ways of retrieving clauses from the database. A return |
| 417 | value of NULL indicates no (more) clauses matching the given criteria. |
| 418 | Calling the functions repeatedly retrieves more matching clauses, if any. |
| 419 | |
| 420 | \func{wxExpr* }{FindClause}{\param{long}{ id}} |
| 421 | |
| 422 | Find a clause based on the special ``id'' attribute. |
| 423 | |
| 424 | \func{wxExpr* }{FindClause}{\param{const wxString\&}{ attribute}, \param{const wxString\&}{ value}} |
| 425 | |
| 426 | Find a clause which has the given attribute set to the given string or word value. |
| 427 | |
| 428 | \func{wxExpr*}{FindClause}{\param{const wxString\&}{ attribute}, \param{long}{ value}} |
| 429 | |
| 430 | Find a clause which has the given attribute set to the given integer value. |
| 431 | |
| 432 | \func{wxExpr*}{FindClause}{\param{const wxString\&}{ attribute}, \param{float}{ value}} |
| 433 | |
| 434 | Find a clause which has the given attribute set to the given floating point value. |
| 435 | |
| 436 | \membersection{wxExprDatabase::FindClauseByFunctor}\label{wxexprdatabasefindclausebyfunctor} |
| 437 | |
| 438 | \func{wxExpr*}{FindClauseByFunctor}{\param{const wxString\&}{ functor}} |
| 439 | |
| 440 | Find the next clause with the specified functor. |
| 441 | |
| 442 | \membersection{wxExprDatabase::GetErrorCount}\label{wxexprdatabasegeterrorcount} |
| 443 | |
| 444 | \constfunc{int}{GetErrorCount}{\void} |
| 445 | |
| 446 | Returns the number of errors encountered during the last read or write operation. |
| 447 | |
| 448 | \membersection{wxExprDatabase::HashFind}\label{wxexprdatabasehashfind} |
| 449 | |
| 450 | \constfunc{wxExpr*}{HashFind}{\param{const wxString\&}{ functor}, \param{long}{ value}} |
| 451 | |
| 452 | Finds the clause with the given functor and with the attribute specified |
| 453 | in the database constructor having the given integer value. |
| 454 | |
| 455 | For example, |
| 456 | |
| 457 | \begin{verbatim} |
| 458 | // Hash on a combination of functor and integer "id" attribute when reading in |
| 459 | wxExprDatabase db(wxExprInteger, "id"); |
| 460 | |
| 461 | // Read it in |
| 462 | db.ReadProlog("data"); |
| 463 | |
| 464 | // Retrieve a clause with specified functor and id |
| 465 | wxExpr *clause = db.HashFind("node", 24); |
| 466 | \end{verbatim} |
| 467 | |
| 468 | This would retrieve a clause which is written: {\tt node(id = 24, ..., )}. |
| 469 | |
| 470 | \func{wxExpr*}{HashFind}{\param{const wxString\&}{ functor}, \param{const wxString\&}{ value}} |
| 471 | |
| 472 | Finds the clause with the given functor and with the attribute specified |
| 473 | in the database constructor having the given string value. |
| 474 | |
| 475 | \membersection{wxExprDatabase::Read}\label{wxexprdatabaseread} |
| 476 | |
| 477 | \func{bool}{Read}{\param{const wxString\&}{ filename}} |
| 478 | |
| 479 | Reads in the given file, returning true if successful. |
| 480 | |
| 481 | \membersection{wxExprDatabase::ReadFromString}\label{wxexprdatabasereadfromstring} |
| 482 | |
| 483 | \func{bool}{ReadFromString}{\param{const wxString\&}{ buffer}} |
| 484 | |
| 485 | Reads a Prolog database from the given string buffer, returning true if |
| 486 | successful. |
| 487 | |
| 488 | \membersection{wxExprDatabase::Write}\label{wxexprdatabasewrite} |
| 489 | |
| 490 | \func{bool}{Write}{\param{FILE *}{stream}} |
| 491 | |
| 492 | \func{bool}{Write}{\param{const wxString\&}{ filename}} |
| 493 | |
| 494 | Writes the database as a Prolog-format file. |
| 495 | |
| 496 | |