Download 6800 assembly language programming by Lance A Leventhal PDF

By Lance A Leventhal

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When a package is loaded in this way, the main application can no longer use its units as normal. Instead, you have two choices: either have the package explicitly say what types it exposes via exported functions, or have the main application poll the RTTI (runtime type information) system. In the first case, a package is treated like an ordinary DLL or dylib, only without its author needing to worry about Delphi-specific types, calling conventions, and inter-module memory management. Create(TSomeForm, TSomeOtherForm); end; exports GetExportedFormClasses {$IFDEF MACOS} name '_GetExportedFormClasses'{$ENDIF}; end.

Make(@EnumValue, TypeInfo(TMyEnum), Box); To unbox a value, you generally use the AsType method as previously shown. , as a floating point number function AsInteger: Integer; function AsInt64: Int64; function AsInterface: IInterface; function AsObject: TObject; function AsString: string; function AsVariant: Variant; Where AsInteger has the same effect as AsType, so AsObject has the same effect as AsType and so on. Similar to how Make is a lower level version of From, the AsType function has some lower-level peers too: property DataSize: Integer read GetDataSize; procedure ExtractRawData(ABuffer: Pointer); procedure ExtractRawDataNoCopy(ABuffer: Pointer); function GetReferenceToRawData: Pointer; In the case of a reference type, GetReferenceToRawData will still return a pointer to the instance, even though the instance itself will be an implicit pointer already.

GetReferenceToRawData)^; WriteLn(S); //output: I love pointers end. Converting between types As such, TValue is not designed for automatically converting between types. The general rule is that if a given conversion isn’t supported implicitly in normal Delphi code, it isn’t supported by TValue. g. an enumeration. ToString; //(class 'TStringBuilder' @ 004180D0) In the class and class reference cases, the figure after the @ sign is the memory address of the object and class reference respectively.

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