dll通用操作单元

dll通用操作单元

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/// <author>cxg 2019-3-4</author> /// 装载（释放）DLL /// 适用于Delphi所有版本   unit ynDLL;   interface   uses   Classes, Windows, SysUtils;   type   TDll = record     dllName: string;     dllHandle: Cardinal;   end;   var   dllList: array of TDll;   type   TynFun = function(params: string): string; stdcall; /// <summary> /// 执行指名DLL里面的指名函数 /// </summary> /// <param name="dllName">DLL文件名</param> /// <param name="procName">函数名</param> /// <param name="inParams">函数入参</param> /// <returns>结果</returns>   function ExecDllProc(const dllName, procName, inParams: string): string; /// <summary> /// 释放所有加载的DLL /// </summary>   procedure FreeDllList; /// <summary> /// 获取指定文件夹里面的所有文件名，不包括其子文件夹 /// </summary> /// <param name="path">文件夹</param> /// <param name="ext">文件扩展名，默认是所有类型</param> /// <returns></returns>   function SearchFiles(path: string; ext: string = '*.*'): TStringList; /// <summary> /// 加载指名文件夹里面的所有DLL /// </summary> /// <param name="path">文件夹</param>   procedure LoadAllDll(path: string);   implementation   function SearchFiles(path: string; ext: string = '*.*'): TStringList; var   SearchRec: TSearchRec;   found: integer; begin   Result := TStringList.Create;   found := FindFirst(path + '\' + ext, faAnyFile, SearchRec);   while found = 0 do   begin     if (SearchRec.Name <> '.') and (SearchRec.Name <> '..') and (SearchRec.Attr <> faDirectory) then       Result.Add(SearchRec.Name);     found := FindNext(SearchRec);   end;   FindClose(SearchRec); end;   procedure FreeDllList; var   i: integer; begin   for i := Low(dllList) to High(dllList) do   begin     FreeLibrary(dllList[i].dllHandle);   end; end;   procedure LoadAllDll(path: string); var   list: TStringList;   fullName: string;   i: integer;   handle: Cardinal;   dll: TDll; begin   list := SearchFiles(path, '*.dll');   SetLength(dllList, list.Count);   for i := 0 to list.Count - 1 do   begin     fullName := path + '\' + list[i];     handle := LoadLibrary(PChar(fullName));     if handle <> 0 then     begin       dll.dllName := list[i];       dll.dllHandle := handle;       dllList[i] := dll;     end;      end;    if Assigned(list) then     list.Free; end;   function ExecDllProc(const dllName, procName, inParams: string): string; var   LHandle: Cardinal;   LPointer: Pointer;   LDll: TDll;   LSize: Integer;     function ExistDll(const dll: string): Cardinal;   var     i: Integer;     s: string;   begin     result := 0;     s := ExtractFileName(dll);     for i := 0 to High(dllList) do     begin       if SameText(s, dllList[i].dllName) then       begin         result := dllList[i].dllHandle;         Exit;       end;     end;   end;   begin   Result := '';   if (dllName = '') or (procName = '') then     Exit;   LHandle := ExistDll(dllName);   if LHandle = 0 then   begin     if LHandle = 0 then                         // dll not loaded     try       LHandle := LoadLibrary(PChar(dllName));     // load dll       LDll.dllName := ExtractFileName(dllName);       LDll.dllHandle := LHandle;       LSize := High(dllList);       if LSize = -1 then             // dllList not init       begin         SetLength(dllList, 1);         dllList[0] := LDll;       end       else       begin         SetLength(dllList, LSize + 2);         dllList[LSize] := LDll;       end;       LPointer := GetProcAddress(LHandle, PChar(procName)); // load function       if LPointer <> nil then       begin         Result := TynFun(LPointer)(inParams)            // execute function and get result       end;     except       FreeLibrary(LHandle);     end;   end   else   begin                                                   // dll is loaded     LPointer := GetProcAddress(LHandle, PChar(procName)); // load function     if LPointer <> nil then     begin       Result := TynFun(LPointer)(inParams)                // execute function and get result     end;   end; end;   end.