虚拟内存示例代码 WinApi C++ [英] Virtual Memory Sample code WinApi C++
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问题描述
关于内存分配的教程代码有一些问题.下面有一个代码可以做到:1) 打印虚拟内存数据2)内存分配3) 打印虚拟内存数据4)内存释放5) 打印虚拟内存数据
I have some problems with tutorial code about Memory allocation. Below there is a code which do: 1) print virtal memory data 2) memory allocation 3) print virtal memory data 4) memory releasing 5) print virtal memory data
我才刚开始学习 WinApi 的 C++.有人可以帮我写代码吗?我无法编译它.我遇到了一些错误(如下所示).据我所知，此代码在 MS Visual Studio 的早期版本中正常工作.目前我正在使用 2010 版本.提前致谢.
I am only starting learning C++ for WinApi. Can somebody help me with code? I cannot compile it.I am getting some errors(are shown below). As I know this code worked correctly in earlier versions of MS Visual Studio. Currently I am working with 2010 version. Thanks in advance.
#include "stdafx.h"
LPVOID myblock[5];
BOOL alloc = FALSE;
PCTSTR GetProtectText(MEMORY_BASIC_INFORMATION mbi)
{
PCTSTR p = "Unknown";
if(mbi.State == MEM_FREE) mbi.Protect = PAGE_NOACCESS;
if(mbi.State == MEM_RESERVE) mbi.Protect = mbi.AllocationProtect;
switch (mbi.Protect & ~(PAGE_GUARD | PAGE_NOCACHE | PAGE_WRITECOMBINE))
{
case PAGE_READONLY: p = "-R--"; break;
case PAGE_READWRITE: p = "-RW-"; break;
case PAGE_WRITECOPY: p = "-RWC"; break;
case PAGE_EXECUTE: p = "E---"; break;
case PAGE_EXECUTE_READ: p = "ER--"; break;
case PAGE_EXECUTE_READWRITE: p = "ERW-"; break;
case PAGE_EXECUTE_WRITECOPY: p = "ERWC"; break;
case PAGE_NOACCESS: p = "----"; break;
}
return(p);
}
PCTSTR GetMemStorageText(MEMORY_BASIC_INFORMATION mbi)
{
PCTSTR p = TEXT("Unknown");
switch (mbi.State)
{
case MEM_FREE: p = "Free"; break;
case MEM_RESERVE: p = "Reserve"; break;
case MEM_COMMIT:
switch (mbi.Type)
{
case MEM_FREE: p = "Free"; break;
case MEM_RESERVE: p = "Reserve"; break;
case MEM_IMAGE: p = "Image"; break;
case MEM_MAPPED: p = "Mapped"; break;
case MEM_PRIVATE: p = "Private"; break;
}
break;
}
return(p);
}
VOID MemoryMap()
{
DWORD dwProcessId = GetCurrentProcessId(),
dwNeeded = 0;
HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwProcessId);
HMODULE lpModule[40]; //handle to a module
LPVOID lpModuleAddress[40];
MODULEINFO ModuleInfo; //structure contains the module load address, size, and entry point.
EnumProcessModules(hProcess, lpModule, sizeof(HMODULE)*40, &dwNeeded);
dwNeeded /= sizeof(HMODULE);
for(UINT i = 0;i < dwNeeded;i++)
{
GetModuleInformation(hProcess, lpModule[i], &ModuleInfo, sizeof(ModuleInfo));
lpModuleAddress[i] = ModuleInfo.lpBaseOfDll;
}
MEMORY_BASIC_INFORMATION mbi; //structure contains information about a range of //pages in the virtual address space of a process
PVOID lpAddress = NULL;
printf(" Address\tBlok Size\tStorage\t\tProtect\n");
CHAR str[255];
while(VirtualQueryEx(hProcess, lpAddress, &mbi, sizeof(mbi)))
{
if(!(((UINT)lpAddress) % 0x10000))
{
printf("0x%p\t\t\t%s", lpAddress, GetMemStorageText(mbi));
for(int i = 0;i < 5;i++)
if(myblock[i] == lpAddress && alloc) printf("\n(My Al-location Block)");
for(int i = 0;i < dwNeeded;i++)
if(lpAddress == lpModuleAddress[i])
{
GetModuleFileName(lpModule[i], str, 255);
printf("\n(Image: %s)", str);
}
printf("\n");
}
printf(" 0x%p\t0x%p\t%s\t\t%s\n", lpAddress, (DWORD)mbi.RegionSize,
GetMemStorageText(mbi), GetProtectText(mbi));
lpAddress = ((PBYTE)lpAddress + mbi.RegionSize);
};
}
VOID Allocation()
{
alloc = TRUE;
myblock[0] = VirtualAlloc(NULL, 1024, MEM_RESERVE, PAGE_READONLY);
myblock[1] = VirtualAlloc(NULL, 1024*2, MEM_RESERVE, PAGE_READWRITE);
myblock[2] = VirtualAlloc(NULL, 1024*8, MEM_RESERVE, PAGE_EXECUTE);
myblock[3] = VirtualAlloc(NULL, 1024*16, MEM_RESERVE|MEM_COMMIT, PAGE_EXECUTE_READ);
myblock[4] = VirtualAlloc(NULL, 1024*16, MEM_RESERVE|MEM_COMMIT, PAGE_EXECUTE_READWRITE);
}
VOID Release()
{
for(int i = 0;i < 5;i++)
VirtualFree(myblock[i], 0, MEM_RELEASE);
alloc = FALSE;
}
INT _tmain(INT argc, _TCHAR* argv[])
{
printf("\nProcess Virtual Memory Before Allocation Memory:\n");
MemoryMap();
printf("\nProcess Virtual Memory After Allocation Memory:\n");
Allocation();
MemoryMap();
printf("\nProcess Virtual Memory After Release Memory:\n");
Release();
MemoryMap();
getch();
return 0;
}
1>------ Build started: Project: VirtMemory, Configuration: Debug Win32 ------
1>Build started 06.10.2011 23:51:01.
1>InitializeBuildStatus:
1> Touching ".\Debug\VirtMemory.unsuccessfulbuild".
1>ClCompile:
1> VirtMemory.cpp
1>e:\виртуальная память\kod1\virtmemory.cpp(80): warning C4018: '<' : signed/unsigned mismatch
1>e:\виртуальная память\kod1\virtmemory.cpp(123): warning C4996: 'getch': The POSIX name for this item is deprecated. Instead, use the ISO C++ conformant name: _getch. See online help for details.
1> d:\program files\microsoft visual studio 10.0\vc\include\conio.h(128) : see declaration of 'getch'
1>ManifestResourceCompile:
1> All outputs are up-to-date.
1>VirtMemory.obj : error LNK2019: unresolved external symbol _GetModuleInformation@16 referenced in function "void __cdecl MemoryMap(void)" (?MemoryMap@@YAXXZ)
1>VirtMemory.obj : error LNK2019: unresolved external symbol _EnumProcessModules@16 referenced in function "void __cdecl MemoryMap(void)" (?MemoryMap@@YAXXZ)
1>.\Debug\VirtMemory.exe : fatal error LNK1120: 2 unresolved externals
1>
1>Build FAILED.
1>
1>Time Elapsed 00:00:01.43
enter code here
推荐答案
GetModuleInformation &EnumProcessModules 将要求您正确包含并链接 psapi.lib
GetModuleInformation & EnumProcessModules will require that you properly include and link with psapi.lib
您可以在项目顶部轻松添加:
You can do so easily at the top of your project add:
#include <Psapi.h>
#pragma comment(lib, "psapi.lib")
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