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POout parameter and "ShowMessage" function
 

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  1. POout parameter and "ShowMessage" function
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    <p>I have a function declare like this :</p> <p><code>function execProc(ProcName,InValues:PChar;out OutValues:PChar):integer; //The "OutValues" is a out parameter.</code></p> <p>And I call this function like this:</p> <pre><code>procedure TForm1.Button6Click(Sender: TObject); var v:integer; s:pchar; begin Memo1.Clear; v := execProc(pchar('PROC_TEST'),pchar('aaa'),s); showmessage(inttostr(v)); //mark line Memo1.Lines.Add(strpas(s)); end; </code></pre> <p>when i delete the mark line(showmessage(inttostr(v))),i will have a correct result display in the Memo1,but if i keep use the showmessage(), the memo1 will dispaly an error string : "Messag" ,Why? Thanks for any help!</p> <pre><code>function execProc(ProcName,InValues:PChar;out OutValues:PChar):integer; var str: TStrings; InValue,OutValue: string; i,j,scount: integer; begin Result := -100; i := 0; j := 0; str := TStringList.Create; try sCount := ExtractStrings(['|'], [], InValues, str); with kbmMWClientStoredProc1 do begin Close; Params.Clear; StoredProcName := StrPas(ProcName); FieldDefs.Updated := False; FieldDefs.Update; for i := 0 to Params.Count - 1 do begin if (Params[i].ParamType = ptUnknown) or (Params[i].ParamType = ptInput) or (Params[i].ParamType = ptInputOutput) then begin inc(j); InValue := str[j-1]; Params[i].Value := InValue; end; end; try ExecProc; for i := 0 to Params.Count - 1 do begin if (Params[i].ParamType = ptOutput) or (Params[i].ParamType = ptInputOutput) then OutValue := OutValue + '|' + Params[i].AsString; end; OutValues := PChar(Copy(OutValue,2,Length(OutValue)-1)); Result := 0; except on E:Exception do begin if E.Message = 'Connection lost.' then Result := -101;//服务器连接失败 if E.Message = 'Authorization failed.' then Result := -102;//身份验证失败 Writelog(E.Message); end; end; end; finally str.Free; end; end; </code></pre>
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    1. USPfeng.org
    1. USPfeng.org
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    1. COCan you show implementation of `execProc`. If it is a function in an external DLL, please show its declaration from the C header file.
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      1. USDavid Heffernan
    2. COThank you @DavidHeffernan, I have edited my problem description and added the implementation of `execProc` after the description.
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      1. POout parameter and "ShowMessage" function
      1. USPfeng.org
    3. COThank you. I have added an answer which explains what is wrong with your code.
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      1. POout parameter and "ShowMessage" function
      1. USDavid Heffernan
 

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