Databases
StackOverflow2013
Postsdbo
PODelphi "array of const" to "varargs"
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PODelphi "array of const" to "varargs"
    primarykey
    data
    text
    <p>Please help! I need this conversion to write wrapper for some C headers for Delphi.</p> <p>As an example:</p> <pre><code>function pushfstring(fmt: PAnsiChar): PAnsiChar; cdecl; varargs; external; ... function PushString(fmt: AnsiString; const args: array of const): AnsiString; begin Result := AnsiString(pushfstring(PAnsiString(fmt), args)); // it's incorrect :/ end; </code></pre> <p>How can I convert "array of const" to "varargs"?</p> <p><strong>edit</strong>: function PushString is actually inside the record (I gave a simplified example), and I do not have direct access to pushfstring. Direct call is excluded.</p> <p><strong>edit 2</strong>:I write the units for LUA library for Delphi and the case is quite important for me.</p> <p>Specifying and providing all the details of the matter - I have this function in C:</p> <pre><code>LUA_API const char *(lua_pushfstring) (lua_State *L, const char *fmt, ...);</code></pre> <p>In Delphi I have something like this:</p> <p><em>LuaLibrary.pas</em></p> <pre><code>{...} interface {...} function lua_pushfstring(L: lua_State; fmt: PAnsiChar): PAnsiChar; cdecl; varargs; implementation {...} function lua_pushfstring; external 'lua.dll'; // or from OMF *.obj file by $L</code></pre> <p><em>dtxLua.pas</em></p> <pre><code>uses LuaLibrary; {...} type TLuaState = packed record private FLuaState: lua_State; public class operator Implicit(A: TLuaState): lua_State; inline; class operator Implicit(A: lua_State): TLuaState; inline; {...} // btw. PushFString can't be inline function function PushFString(fmt: PAnsiChar; const args: array of const ): PAnsiChar; //... and a lot of 'wrapper functions' for functions like a lua_pushfstring, // where L: lua_State; is the first parameter end; implementation {...} function TLuaState.PushFString(fmt: PAnsiChar; const args: array of const ) : PAnsiChar; begin Result := lua_pushfstring(FLuaState, fmt, args); // it's incorrect :/ end;</code></pre> <p>and in other units like Lua.pas i use only TLuaState from dtxLua.pas (because LuaLibrary is bulky, dtxLua is my wrapper), for many useful and cool things...</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USHNB
    1. USHNB
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PODelphi "array of const" to "varargs"
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PODelphi "array of const" to "varargs"
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PODelphi "array of const" to "varargs"
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThe `pushfstring` function you're trying to call is an external function. It's impossible to "not have direct access" to it because you can make a declaration for it anywhere you want. Although I appreciate your desire to call a varargs function with an unknown number of parameters, you don't actually need that in your case because you *can* directly call `pushfstring` from wherever you would have called `PushString`.
      singulars
      1. PODelphi "array of const" to "varargs"
      1. USRob Kennedy
    2. CO@Rob - I suspect he has a function pointer.
      singulars
      1. PODelphi "array of const" to "varargs"
      1. USBarry Kelly
    3. COWhat's the C prototype for `pushfstring`?
      singulars
      1. PODelphi "array of const" to "varargs"
      1. USBarry Kelly
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload