WIN API当中的堆管理，虚拟内存及常规复制，移动，填充代码

代码一个一个的输入，有点累，但也充实。

感觉收获较多。

特别是书中将C标准库的malloc最终调用的是HeapAlloc函数。

而相对于堆内存管理负责的HeapAlloc(GlobalAlloc,LocalAlloc),属于虚拟内存管理范围的VirtualAlloc更底层。

这对理解操作系统实现及以后的软件性能及内存泄漏调度，更有帮助。

Heap.c

 1 #include <Windows.h>
 2 #include <stdio.h>
 3
 4 #define MEM_BLOCK_SIZE 32
 5
 6 BOOL ShowMemContent(LPVOID, SIZE_T);
 7 int main(void)
 8 {
 9     HANDLE hHeap = GetProcessHeap();
10     LPVOID lpSrc;
11     LPVOID lpDis;
12
13     lpSrc = HeapAlloc(hHeap, 0, MEM_BLOCK_SIZE);
14     lpDis = HeapAlloc(hHeap, 0, MEM_BLOCK_SIZE);
15
16     printf("HeapAlloc distribut but not make zero: \n");
17     ShowMemContent(lpDis, MEM_BLOCK_SIZE);
18
19     ZeroMemory(lpDis, MEM_BLOCK_SIZE);
20     printf("ZeroMemory make zero: \n");
21     ShowMemContent(lpDis,MEM_BLOCK_SIZE);
22
23     FillMemory(lpSrc, MEM_BLOCK_SIZE, 0xBB);
24     FillMemory(lpSrc, MEM_BLOCK_SIZE/2, 0xAA);
25     CopyMemory(lpDis, lpSrc, MEM_BLOCK_SIZE);
26
27     printf("FillMemory fill Memory: \n");
28     ShowMemContent(lpDis,MEM_BLOCK_SIZE);
29
30     HeapFree(hHeap, 0, lpSrc);
31     HeapFree(hHeap, 0, lpDis);
32     return 0;
33 }
34
35 BOOL ShowMemContent(LPVOID lpMem, SIZE_T dwSize)
36 {
37     BYTE lpShow[MEM_BLOCK_SIZE];
38     INT i;
39
40     if(dwSize > MEM_BLOCK_SIZE)
41     {
42         printf("over-flow!");
43         return FALSE;
44     }
45
46     CopyMemory((LPVOID)lpShow, lpMem, dwSize);
47     for(i = 0; i < dwSize; i++)
48     {
49         printf("%.2x",lpShow[i]);
50         if(!((i+1)%16))
51         {
52             printf("\n");
53         }
54     }
55     printf("\n");
56     return TRUE;
57 }

Virtual.c

 1 #include <Windows.h>
 2 #include <stdio.h>
 3
 4 int main(void)
 5 {
 6     SIZE_T sizeVirtual = 4000;
 7     LPVOID lpRound = (LPVOID)0x100000FF;
 8     MEMORY_BASIC_INFORMATION mbi;
 9
10     LPVOID lpAddress = VirtualAlloc(
11         lpRound, sizeVirtual,
12         MEM_COMMIT|MEM_RESERVE, PAGE_READWRITE

13         );
14     if(lpAddress == NULL)
15     {
16         printf("VirtualAlloc error: %d\n",GetLastError());
17         return 1;
18     }
19     printf("Alloc:MEM_COMMIT|MEM_RESERVE\n");
20     CopyMemory(lpAddress, "Hello", lstrlen("Hello"));
21     printf("Alloction,Copy sucess.address: 0x%.8x, content: %s\n",lpAddress, lpAddress);
22     VirtualQuery(lpAddress, &mbi, sizeof(mbi));
23     printf("Information from VirtualQuery: \n"
24         "BaseAddress:0x%.8x\tAllocationBase:0x%.8x\t"
25         "AllocationProtect:0x%.8x\tRegionSize:%u\t"
26         "State:0x%.8x\tProtect:0x%.8x\tType:0x%.8x\n",
27         mbi.BaseAddress,mbi.AllocationBase,
28         mbi.AllocationProtect,mbi.RegionSize,
29         mbi.State,mbi.Protect,mbi.Type
30         );
31
32     printf("Free: DECOMMIT\n");
33     if(!VirtualFree(lpRound, sizeVirtual, MEM_DECOMMIT))
34     {
35         printf("VirtualFree error: %d",GetLastError());
36         return 1;
37     }
38
39     VirtualQuery(lpAddress, &mbi, sizeof(mbi));
40     printf("Information from VirtualQuery: \n"
41         "BaseAddress:0x%.8x\tAllocationBase:0x%.8x\t"
42         "AllocationProtect:0x%.8x\tRegionSize:%u\t"
43         "State:0x%.8x\tProtect:0x%.8x\tType:0x%.8x\n",
44         mbi.BaseAddress,mbi.AllocationBase,
45         mbi.AllocationProtect,mbi.RegionSize,
46         mbi.State,mbi.Protect,mbi.Type
47         );
48
49     printf("Free:RELEASE\n");
50     if(!VirtualFree(lpAddress, 0, MEM_RELEASE))
51     {
52         printf("VirtualFree error: %d",GetLastError());
53         return 1;
54     }
55     return 0;
56 }

MemOp.c

 1 #include <Windows.h>
 2 #include <stdio.h>
 3
 4 #define MEM_BLOCK_SIZE 32
 5
 6 BOOL ShowMemContent(LPVOID, SIZE_T);
 7 int main(void)
 8 {
 9     HANDLE hHeap = GetProcessHeap();
10     LPVOID lpSrc;
11     LPVOID lpDis;
12
13     lpSrc = HeapAlloc(hHeap, 0, MEM_BLOCK_SIZE);
14     lpDis = HeapAlloc(hHeap, 0, MEM_BLOCK_SIZE);
15
16     printf("HeapAlloc distribut but not make zero: \n");
17     ShowMemContent(lpDis, MEM_BLOCK_SIZE);
18
19     ZeroMemory(lpDis, MEM_BLOCK_SIZE);
20     printf("ZeroMemory make zero: \n");
21     ShowMemContent(lpDis,MEM_BLOCK_SIZE);
22
23     FillMemory(lpSrc, MEM_BLOCK_SIZE, 0xBB);
24     FillMemory(lpSrc, MEM_BLOCK_SIZE/2, 0xAA);
25     CopyMemory(lpDis, lpSrc, MEM_BLOCK_SIZE);
26
27     printf("FillMemory fill Memory: \n");
28     ShowMemContent(lpDis,MEM_BLOCK_SIZE);
29
30     HeapFree(hHeap, 0, lpSrc);
31     HeapFree(hHeap, 0, lpDis);
32     return 0;
33 }
34
35 BOOL ShowMemContent(LPVOID lpMem, SIZE_T dwSize)
36 {
37     BYTE lpShow[MEM_BLOCK_SIZE];
38     INT i;
39
40     if(dwSize > MEM_BLOCK_SIZE)
41     {
42         printf("over-flow!");
43         return FALSE;
44     }
45
46     CopyMemory((LPVOID)lpShow, lpMem, dwSize);
47     for(i = 0; i < dwSize; i++)
48     {
49         printf("%.2x",lpShow[i]);
50         if(!((i+1)%16))
51         {
52             printf("\n");
53         }
54     }
55     printf("\n");
56     return TRUE;
57 }

运行图：