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XSharpLoadLibrary Function (RT)

Year Function (RT)

MemGrpCAlloc Function

Allocate static memory buffers of a specified size.

Namespace: XSharp.RT
Assembly: XSharp.RT (in XSharp.RT.dll) Version: 2.19

Syntax

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 FUNCTION MemGrpCAlloc(
	wGroup AS DWORD,
	wItems AS DWORD,
	wBytes AS DWORD
) AS IntPtr

public static IntPtr MemGrpCAlloc(
	uint wGroup,
	uint wItems,
	uint wBytes
)

Request Example View Source

Parameters

wGroup: Type: DWord
The group to which the newly allocated memory buffer will belong. This group should have already been opened by MemGrpOpen().
wItems: Type: DWord
The number of items to allocate memory for.
wBytes: Type: DWord
The number of bytes to allocate for each item.

Return Value

Type: IntPtr
A pointer to the allocated space if there is sufficient memory available; otherwise, a NULL_PTR. You should always check the return value from MemCAlloc() for a successful allocation.

Remarks

Tip
The Static Memory Functions (MemAlloc, MemSet etc) are included for compatibility only. In most cases the static memory blocks can (and should) be replaced with arrays of bytes. Many of the functions in the runtime that take memory blocks as parameter, such as the low level IO functions, now have overloads that take arrays of bytes as parameter. We recommend that you use these overloads, because their performance is somewhat better.

Tip

The Static Memory Functions (MemAlloc, MemSet etc) are included for compatibility only. In most cases the static memory blocks can (and should) be replaced with arrays of bytes.
Many of the functions in the runtime that take memory blocks as parameter, such as the low level IO functions, now have overloads that take arrays of bytes as parameter.
We recommend that you use these overloads, because their performance is somewhat better.

Examples

This example uses MemCAlloc() to allocate space for ten long integers:

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1LOCAL ptrLongs AS PTR
2ptrLongs := MemCAlloc(10, 4)

Instead of hard-coding 4 for the size of a long integer, we could have issued:

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1ptrLongs := MemCAlloc(10, _SizeOf(LONG))

This next example uses MemCAlloc() to allocate space for five instances of a defined structure:

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 1STRUCTURE StatInfo
 2    MEMBER wAverageHit AS DWORD
 3    MEMBER wMaxHit AS DWORD
 4    MEMBER wMinHit AS DWORD
 5FUNCTION MemCAlloc2() AS VOID
 6    LOCAL ptrStruct AS PTR
 7    ptrStruct := MemCAlloc(5, _SizeOf(StatInfo))
 8    IF ptrStruct = NULL_PTR
 9        ? "Allocation failed"
10    ELSE
11        MemFree(ptrStruct)
12    ENDIF

Reference

Functions, Globals and Defines

XSharp.RT Namespace

MemAlloc(DWord)

MemFree(IntPtr)

MemGrpAlloc(DWord, DWord)