WIN API当中的堆管理，虚拟内存及常规复制，移动，填充代码-白红宇

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 
     
       2 #include 
      
        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 
     
       2 #include 
      
        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_READWRITE13         );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.Type30         );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.Type47         );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 
     
       2 #include 
      
        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 }

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