Class # Xojo.Core.MutableMemoryBlock ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Warning
This item was deprecated in version 2020r2. Please use `MemoryBlock` as a replacement.
## Description A mutable class for managing and modifying blocks of memory. ## Properties
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| Name | Type | Read-Only | Shared | |-----------------------------------------------------------|-------------------------------------------------------|-----------|--------| | `Data` | `Ptr` | ✓ | | | `LittleEndian` | `Boolean` | | | | `Size` | `UInteger` | ✓ | | ## Methods
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| Name | Parameters | Returns | Shared | |-------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------|--------| | `BooleanValue` | offset As `UInteger`, `Assigns` value As `Boolean` | | | | `Clone` | | `MemoryBlock` | | | `Comparison` | | | | | `Constructor` | bytes() As `Byte` | | | | `Constructor` | p As `Ptr` | | | | `Constructor` | p As `Ptr`, size As `UInteger` | | | | `Constructor` | size As `UInteger` | | | | `Constructor` | bytes() As `Byte` | | | | `Constructor` | other As `MemoryBlock` | | | | `Constructor` | p As `Ptr` | | | | `Constructor` | p As `Ptr`, size As `UInteger` | | | | `Constructor` | size As `UInteger` | | | | `CStringValue` | offset As `UInteger`, `Assigns` value As `CString` | | | | `CurrencyValue` | offset As `UInteger`, `Assigns` value As `Currency` | | | | `DoubleValue` | offset As `UInteger`, `Assigns` value As `Double` | | | | `IndexOf` | offset As `UInteger`, other As `MemoryBlock` | `UInteger` | | | `Int16Value` | offset As `UInteger`, `Assigns` value As `Int16` | | | | `Int32Value` | offset As `UInteger`, `Assigns` value As `Int32` | | | | `Int64Value` | offset As `UInteger`, `Assigns` value As `Int64` | | | | `Int8Value` | offset As `UInteger` | `Int8` | | | `Left` | bytes As `UInteger` | `MemoryBlock` | | | `PtrValue` | offset As `UInteger`, `Assigns` value As `Ptr` | | | | `Remove` | offset As `UInteger`, length As `UInteger` | | | | `Right` | bytes As `UInteger` | `MemoryBlock` | | | `SingleValue` | offset As `UInteger`, `Assigns` value As `Single` | | | | `UInt16Value` | offset As `UInteger`, `Assigns` value As `UInt16` | | | | `UInt32Value` | offset As `UInteger`, `Assigns` value As `UInt32` | | | | `UInt64Value` | offset As `UInteger`, `Assigns` value As `UInt64` | | | | `UInt8Value` | offset As `UInteger`, `Assigns` value As `UInt8` | | | | `WStringValue` | offset As `UInteger`, `Assigns` value As `WString` | | | ## Property descriptions
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Xojo.Core.MutableMemoryBlock.Data **Data** As `Ptr` The memory data in the MemoryBlock. This property is read-only. This data pointer is invalidated when the MemoryBlock is changed.
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Xojo.Core.MutableMemoryBlock.LittleEndian **LittleEndian** As `Boolean` When True, indicates that the MemoryBlock data is in LittleEndian format. The default is True. Simple endian usage: ``` xojo Var mb1 As New Xojo.Core.MemoryBlock(2) ' defaults to Little Endian = True on all platforms mb1.Int8Value(0) = 1 mb1.Int8Value(1) = 2 Var firstUInt16 As Int16 firstUInt16 = mb1.UInt16Value(0) ' firstUInt16 = (256 * 2) + (1 * 1) = 513 mb1.LittleEndian = False Var secondUInt16 As Int16 secondUInt16 = mb1.UInt16Value(0) ' secondUInt16 = (256 * 1) + (1 * 2) = 258 ```
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Xojo.Core.MutableMemoryBlock.Size **Size** As `UInteger` The size (in bytes) of the MemoryBlock. This property is read-only. If the size is unknown, this returns &hFFFFFFFF (32-bit apps) or &hFFFFFFFFFFFFFFFF (64-bit app). ## Method descriptions
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Xojo.Core.MutableMemoryBlock.BooleanValue **BooleanValue**(offset As `UInteger`, `Assigns` value As `Boolean`) Sets a Boolean value in the MemoryBlock at the specified offset (in bytes). Any non-zero value is considered True. ``` xojo Var value As New Xojo.Core.MutableMemoryBlock(1) value.BooleanValue(0) = True ```
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Xojo.Core.MutableMemoryBlock.Clone **Clone** As `MemoryBlock` Makes a copy of the MemoryBlock. If its size is known, it copies the content. ``` xojo Var mb1 As New Xojo.Core.MemoryBlock(64) Var mb2 As Xojo.Core.MemoryBlock = mb1.Clone ```
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Xojo.Core.MutableMemoryBlock.Comparison **Comparison** MemoryBlocks can be compared with each other using the "=" operator. MemoryBlocks are considered equal for these conditions: \* The MemoryBlocks are the same object \* Both MemoryBlocks' data point to the same location \* Both MemoryBlocks' size and content are the same There is no concept of one MemoryBlock being greater than or less than another MemoryBlock.
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Xojo.Core.MutableMemoryBlock.Constructor **Constructor**(bytes() As `Byte`)
Note
`Constructors` are special methods called when you create an object with the `New` keyword and pass in the parameters above.
Creates a MemoryBlock from an existing Byte array.
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Xojo.Core.MutableMemoryBlock.Constructor **Constructor**(p As `Ptr`)
Note
`Constructors` are special methods called when you create an object with the `New` keyword and pass in the parameters above.
Creates a MemoryBlock from an existing chunk of memory.
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Xojo.Core.MutableMemoryBlock.Constructor **Constructor**(p As `Ptr`, size As `UInteger`)
Note
`Constructors` are special methods called when you create an object with the `New` keyword and pass in the parameters above.
Creates a MemoryBlock from an existing block of memory of a specific size.
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Xojo.Core.MutableMemoryBlock.Constructor **Constructor**(size As `UInteger`)
Note
`Constructors` are special methods called when you create an object with the `New` keyword and pass in the parameters above.
Creates a MemoryBlock with the desired size in bytes.
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Xojo.Core.MutableMemoryBlock.Constructor **Constructor**(bytes() As `Byte`)
Note
`Constructors` are special methods called when you create an object with the `New` keyword and pass in the parameters above.
Creates a MemoryBlock from an existing Byte array.
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Xojo.Core.MutableMemoryBlock.Constructor **Constructor**(other As `MemoryBlock`)
Note
`Constructors` are special methods called when you create an object with the `New` keyword and pass in the parameters above.
Creates a new MemoryBlock with the data from an existing MemoryBlock.
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Xojo.Core.MutableMemoryBlock.Constructor **Constructor**(p As `Ptr`)
Note
`Constructors` are special methods called when you create an object with the `New` keyword and pass in the parameters above.
Creates a MemoryBlock from an existing chunk of memory.
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Xojo.Core.MutableMemoryBlock.Constructor **Constructor**(p As `Ptr`, size As `UInteger`)
Note
`Constructors` are special methods called when you create an object with the `New` keyword and pass in the parameters above.
Creates a MemoryBlock from an existing block of memory of a specific size.
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Xojo.Core.MutableMemoryBlock.Constructor **Constructor**(size As `UInteger`)
Note
`Constructors` are special methods called when you create an object with the `New` keyword and pass in the parameters above.
Creates a MemoryBlock with the desired size in bytes. Reserve 1K: ``` xojo Var mb As New Xojo.Core.MemoryBlock(1024) ' Reserve 1K bytes ```
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Xojo.Core.MutableMemoryBlock.CStringValue **CStringValue**(offset As `UInteger`, `Assigns` value As `CString`) Sets a CString value in the MemoryBlock at the specified offset (in bytes).
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Xojo.Core.MutableMemoryBlock.CurrencyValue **CurrencyValue**(offset As `UInteger`, `Assigns` value As `Currency`) Sets an 8-byte Currency value in the MemoryBlock at the specified offset (in bytes). ``` xojo Var c As Currency = 12.34 Var value As New Xojo.Core.MutableMemoryBlock(8) value.CurrencyValue(0) = c ```
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Xojo.Core.MutableMemoryBlock.DoubleValue **DoubleValue**(offset As `UInteger`, `Assigns` value As `Double`) Sets a Double value in the MemoryBlock at the specified offset (in bytes). ``` xojo Var d As Double = 12.34 Var value As New Xojo.Core.MutableMemoryBlock(8) value.DoubleValue(0) = d ```
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Xojo.Core.MutableMemoryBlock.IndexOf **IndexOf**(offset As `UInteger`, other As `MemoryBlock`) As `UInteger` Returns the position of the other MemoryBlock starting at the offset. Returns -1 if other was not found.
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Xojo.Core.MutableMemoryBlock.Int16Value **Int16Value**(offset As `UInteger`, `Assigns` value As `Int16`) Sets an Int16 value in the MemoryBlock at the specified offset (in bytes).
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Xojo.Core.MutableMemoryBlock.Int32Value **Int32Value**(offset As `UInteger`, `Assigns` value As `Int32`) Sets an Int32 value in the MemoryBlock at the specified offset (in bytes).
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Xojo.Core.MutableMemoryBlock.Int64Value **Int64Value**(offset As `UInteger`, `Assigns` value As `Int64`) Sets an Int64 value in the MemoryBlock at the specified offset (in bytes).
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Xojo.Core.MutableMemoryBlock.Int8Value **Int8Value**(offset As `UInteger`) As `Int8` Gets or sets an Int8 value in the MemoryBlock at the specified offset (in bytes).
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Xojo.Core.MutableMemoryBlock.Left **Left**(bytes As `UInteger`) As `MemoryBlock` Gets the specified number of bytes at the beginning of the MemoryBlock.
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Xojo.Core.MutableMemoryBlock.PtrValue **PtrValue**(offset As `UInteger`, `Assigns` value As `Ptr`) Sets A Ptr value in the MemoryBlock at the specified offset (in bytes).
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Xojo.Core.MutableMemoryBlock.Remove **Remove**(offset As `UInteger`, length As `UInteger`) Removes length bytes from the MemoryBlock starting at offset, adjusting its size. This potentially invalidates the Data property.
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Xojo.Core.MutableMemoryBlock.Right **Right**(bytes As `UInteger`) As `MemoryBlock` Gets the bytes from the end of the MemoryBlock. Get the last two bytes of a MemoryBlock: ``` xojo Var bytes() As Byte bytes.Append(&h0a) bytes.Append(&h0b) bytes.Append(&h0c) Var data As New Xojo.Core.MemoryBlock(bytes) Var mb As Xojo.Core.MemoryBlock = data.Right(2) ```
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Xojo.Core.MutableMemoryBlock.SingleValue **SingleValue**(offset As `UInteger`, `Assigns` value As `Single`) Sets a Single value in the MemoryBlock at the specified offset (in bytes).
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Xojo.Core.MutableMemoryBlock.UInt16Value **UInt16Value**(offset As `UInteger`, `Assigns` value As `UInt16`) Sets an UInt16 value in the MemoryBlock at the specified offset (in bytes).
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Xojo.Core.MutableMemoryBlock.UInt32Value **UInt32Value**(offset As `UInteger`, `Assigns` value As `UInt32`) Sets an UInt32 value in the MemoryBlock at the specified offset (in bytes).
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Xojo.Core.MutableMemoryBlock.UInt64Value **UInt64Value**(offset As `UInteger`, `Assigns` value As `UInt64`) Sets an UInt64 value in the MemoryBlock at the specified offset (in bytes).
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Xojo.Core.MutableMemoryBlock.UInt8Value **UInt8Value**(offset As `UInteger`, `Assigns` value As `UInt8`) Sets an UInt8 value in the MemoryBlock at the specified offset (in bytes).
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Xojo.Core.MutableMemoryBlock.WStringValue **WStringValue**(offset As `UInteger`, `Assigns` value As `WString`) Sets a WString value in the MemoryBlock at the specified offset (in bytes). ## Compatibility All project types on all supported operating systems. ## See also `MemoryBlock` parent class; `MemoryBlock`, `MemoryBlock` classes