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Heap memory allocation

P: n/a
I used this class to dynamic memory allocation:
using System;
using System.Runtime.InteropServices;
public unsafe class Memory
{
// Handle for the process heap. This handle is used in all calls to the
// HeapXXX APIs in the methods below.
static int ph = GetProcessHeap();
// Private instance constructor to prevent instantiation.
private Memory() {}
// Allocates a memory block of the given size. The allocated memory is
// automatically initialized to zero.
public static void* Alloc(int size) {
void* result = HeapAlloc(ph, HEAP_ZERO_MEMORY, size);
if (result == null) throw new OutOfMemoryException();
return result;
}
// Copies count bytes from src to dst. The source and destination
// blocks are permitted to overlap.
public static void Copy(void* src, void* dst, int count) {
byte* ps = (byte*)src;
byte* pd = (byte*)dst;
if (ps pd) {
for (; count != 0; count--) *pd++ = *ps++;
}
else if (ps < pd) {
for (ps += count, pd += count; count != 0; count--) *--pd = *--ps;
}
}
// Frees a memory block.
public static void Free(void* block) {
if (!HeapFree(ph, 0, block)) throw new InvalidOperationException();
}
// Re-allocates a memory block. If the reallocation request is for a
// larger size, the additional region of memory is automatically
// initialized to zero.
public static void* ReAlloc(void* block, int size) {
void* result = HeapReAlloc(ph, HEAP_ZERO_MEMORY, block, size);
if (result == null) throw new OutOfMemoryException();
return result;
}
// Returns the size of a memory block.
public static int SizeOf(void* block) {
int result = HeapSize(ph, 0, block);
if (result == -1) throw new InvalidOperationException();
return result;
}
// Heap API flags
const int HEAP_ZERO_MEMORY = 0x00000008;
// Heap API functions
[DllImport("kernel32")]
static extern int GetProcessHeap();
[DllImport("kernel32")]
static extern void* HeapAlloc(int hHeap, int flags, int size);
[DllImport("kernel32")]
static extern bool HeapFree(int hHeap, int flags, void* block);
[DllImport("kernel32")]
static extern void* HeapReAlloc(int hHeap, int flags,
void* block, int size);
[DllImport("kernel32")]
static extern int HeapSize(int hHeap, int flags, void* block);
}. This class base on a MSDN article.But for my app, i used this class as
followwhile(quit){byte* block = (byte*)Memory.Alloc(bsize * bsize);// add
some value to this block// Do somethingMemory.Free(block);// finish,quit =
false;}but, this loop is done 4, 5 times, then it throw a exception:
StackOverflowExceptionCan you explaiin it for me, and show me a way to fix
itThanks
Oct 19 '06 #1
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