四、认识结构并手动解析

发表于 2024-04-21 分类于 UnrealEngine

一、认识结构

UObject

class UObject
{
/** virtual function table */
void* vtf; 
/** Flags used to track and report various object states. This needs to be 8 byte aligned on 32-bit
  platforms to reduce memory waste */
  EObjectFlags                    ObjectFlags;
  
    /** Index into GObjectArray...very private. */
  int32                            InternalIndex;                //表明该对象在GObjectArray中的第几个
  
    /** Class the object belongs to. */
  UClass*                            ClassPrivate;        //对象所属的基类
  
    /** Name of this object */
  FName                            NamePrivate;           //类名
  
    /** Object this object resides in. */   
  UObject*                        OuterPrivate;      //这个对象是从哪个对象来的
}

UField

class UField : public UObject
{
public:
  /** Next Field in the linked list */
    UField* Next;
};

UEnum

class UEnum : public UField
{
public:
/** How this enum is declared in C++, affects the internal naming of enum values */
enum class ECppForm
{
    Regular, //0
    Namespaced, //1
    EnumClass ///2
};
  
  <br/>
  
  /** 枚举类型的字符串, e.g. "ENamespacedEnum::InnerType" or "ERegularEnum" or "EEnumClass" */
FString CppType;
  
  <br/>
  
  /**枚举成员. */
TArray<TPair<FName, int64>> Names;
  
  <br/>
  
  /** 枚举的最初定义类型. */
ECppForm CppForm;
  
  <br/>
  
  /** pointer to function used to look up the enum's display name. Currently only assigned for UEnums generated for nativized blueprints */
FEnumDisplayNameFn EnumDisplayNameFn;
  
  <br/>
  
  /** global list of all value names used by all enums in memory, used for property text import */
static TMap<FName, UEnum*> AllEnumNames;
}

UStruct

class UStruct : public UField
{
  /** 继承自的结构体，可以为空 */
    UStruct* SuperStruct;
  /** 指向下一个子对象的指针 */
    UField* Children;
    
    /** 该结构体的总大小 */
    int32 PropertiesSize;
    /** 结构体的对齐大小 */
    int32 MinAlignment;
    
    /** Script bytecode associated with this object */
    TArray<uint8> Script;
    /** In memory only: Linked list of properties from most-derived to base */
    UProperty* PropertyLink;
    /** In memory only: Linked list of object reference properties from most-derived to base */
    UProperty* RefLink;
    /** In memory only: Linked list of properties requiring destruction. Note this does not include things that will be destroyed byt he native destructor */
    UProperty* DestructorLink;
    /** In memory only: Linked list of properties requiring post constructor initialization */
    UProperty* PostConstructLink;
    /** Array of object references embedded in script code. Mirrored for easy access by realtime garbage collection code */
    TArray<UObject*> ScriptObjectReferences;
}

UFunction

class UFunction : public UStruct
{
public:
  // Persistent variables.
  
    /** EFunctionFlags set defined for this function */
  EFunctionFlags FunctionFlags;
  
    // Variables in memory only.
  /** 参数数量 */
  uint8 NumParms;
  /** 所有参数的总大小 */
  uint16 ParmsSize;
  /** 返回值的偏移 */
  uint16 ReturnValueOffset;
  /** Id of this RPC function call (must be FUNC_Net & (FUNC_NetService|FUNC_NetResponse)) */
  uint16 RPCId;
  /** Id of the corresponding response call (must be FUNC_Net & FUNC_NetService) */
  uint16 RPCResponseId;
  /** pointer to first local struct property in this UFunction that contains defaults */
  UProperty* FirstPropertyToInit;
  
    /** The event graph this function calls in to (persistent) */
  UFunction* EventGraphFunction;
  
    /** The state offset inside of the event graph (persistent) */
  int32 EventGraphCallOffset;
  
    /** 所指向的函数地址 */
  FNativeFuncPtr Func;
}

UProperty

class UProperty : public UField
{
  /** 成员上限 **/
    int32            ArrayDim;   
    /** 成员大小  **/
    int32            ElementSize;
    /** 成员标志  **/
    EPropertyFlags    PropertyFlags;
    uint16            RepIndex;
    /** 成员偏移  **/
    int32        Offset_Internal;
    FName        RepNotifyFunc;
    /** 下一个成员 **/
    UProperty*    PropertyLinkNext;
    /** In memory only: Linked list of object reference properties from most-derived to base **/
    UProperty*  NextRef;
    /** In memory only: Linked list of properties requiring destruction. Note this does not include things that will be destroyed byt he native destructor **/
    UProperty*    DestructorLinkNext;
    /** In memory only: Linked list of properties requiring post constructor initialization.**/
    UProperty*    PostConstructLinkNext;
}