C++ h QueryChangesVirtualDisk()函数将RangeCount返回为0
我正在尝试获取两个虚拟磁盘或两个Resillent更改跟踪ID(RCT)之间的差异 但是C++ h QueryChangesVirtualDisk()函数将RangeCount返回为0,c++,hyper-v,windows-server-2016,change-tracking,virtual-disk,C++,Hyper V,Windows Server 2016,Change Tracking,Virtual Disk,我正在尝试获取两个虚拟磁盘或两个Resillent更改跟踪ID(RCT)之间的差异 但是RangeCount始终返回为0 我用两个枚举参数打开了虚拟磁盘文件(vhdx)virtual\u disk\u ACCESS\u GET\u INFO,OPEN\u virtual\u disk\u FLAG\u NONE opStatus = OpenVirtualDisk( &storageType, VirtualDiskPath, VIRTUA
RangeCount
始终返回为0
我用两个枚举参数打开了虚拟磁盘文件(vhdx)virtual\u disk\u ACCESS\u GET\u INFO
,OPEN\u virtual\u disk\u FLAG\u NONE
opStatus = OpenVirtualDisk(
&storageType,
VirtualDiskPath,
VIRTUAL_DISK_ACCESS_GET_INFO,
OPEN_VIRTUAL_DISK_FLAG_NONE,
NULL,
&vhdHandle ); // output handle
然后使用QueryChangesVirtualDisk()
OpenVirtualDisk()
QueryChangesVirtualDisk()
这两个函数都没有返回错误,但在任何情况下,RangeCount
的值始终为0
虚拟磁盘文件和RCT ID之间肯定有区别
请给我一些建议
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <initguid.h>
#include <strsafe.h>
#include <virtdisk.h>
#include "Storage.h"
DWORD QueryChangesVirtualDisk(_In_ LPCWSTR VirtualDiskPath, _In_ LPCWSTR ChangeTrackingId)
{
VIRTUAL_STORAGE_TYPE storageType;
PGET_VIRTUAL_DISK_INFO diskInfo;
ULONG diskInfoSize;
DWORD opStatus;
HANDLE vhdHandle;
QUERY_CHANGES_VIRTUAL_DISK_RANGE *pRctRanges;
ULONG rctRangeCnt;
ULONG64 processedLength;
UINT i;
vhdHandle = INVALID_HANDLE_VALUE;
diskInfo = NULL;
diskInfoSize = sizeof(GET_VIRTUAL_DISK_INFO);
rctRangeCnt = 0L;
processedLength = 0L;
pRctRanges = NULL;
i = 0;
diskInfo = (PGET_VIRTUAL_DISK_INFO)malloc(diskInfoSize);
if (diskInfo == NULL)
{
opStatus = ERROR_NOT_ENOUGH_MEMORY;
goto Cleanup;
}
storageType.DeviceId = VIRTUAL_STORAGE_TYPE_DEVICE_UNKNOWN;
storageType.VendorId = VIRTUAL_STORAGE_TYPE_VENDOR_UNKNOWN;
//////////////////////////////////////////////////////////////////
opStatus = OpenVirtualDisk(
&storageType,
VirtualDiskPath,
VIRTUAL_DISK_ACCESS_GET_INFO,
OPEN_VIRTUAL_DISK_FLAG_NONE,
NULL,
&vhdHandle);
if (opStatus != ERROR_SUCCESS)
{
wprintf(L"OpenVirtualDisk fail\n");
goto Cleanup;
}
opStatus = QueryChangesVirtualDisk(
vhdHandle,
ChangeTrackingId,
0,
32212254720,
QUERY_CHANGES_VIRTUAL_DISK_FLAG_NONE,
pRctRanges,
&rctRangeCnt,
&processedLength
);
wprintf(L"rctRangeCnt : %lu\n", rctRangeCnt);
wprintf(L"processedLength : %llu\n", processedLength);
for (i = 0; i < rctRangeCnt; i++)
{
wprintf(L"ByteOffset : %lld ByteLength : %lld\n", pRctRanges[i].ByteOffset, pRctRanges[i].ByteLength);
}
if (opStatus != ERROR_SUCCESS)
{
wprintf(L"QueryChangesVirtualDisk fail\n");
goto Cleanup;
}
Cleanup:
if (opStatus == ERROR_SUCCESS)
{
wprintf(L"success\n");
}
else
{
wprintf(L"error = %u\n", opStatus);
}
if (vhdHandle != INVALID_HANDLE_VALUE)
{
CloseHandle(vhdHandle);
}
if (diskInfo != NULL)
{
free(diskInfo);
}
if (pRctRanges != NULL)
{
for (i = 0; i < rctRangeCnt; i++)
{
free(&pRctRanges[i]);
}
}
return opStatus;
}
#包括
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#包括
#包括“Storage.h”
DWORD QueryChangesVirtualDisk(u在uuCwstr VirtualDiskPath中,u在uCwstr ChangeTrackingId中)
{
虚拟存储类型存储类型;
虚拟磁盘信息磁盘信息;
ULONG磁盘大小;
德沃德地位;
把手;
查询\更改\虚拟\磁盘\范围*pRctRanges;
ULONG rctRangeCnt;
ULONG64处理长度;
UINT i;
vhdHandle=无效的\u句柄\u值;
diskInfo=NULL;
diskInfoSize=sizeof(获取虚拟磁盘信息);
rctRangeCnt=0升;
处理长度=0L;
pRctRanges=NULL;
i=0;
diskInfo=(PGET\u VIRTUAL\u DISK\u INFO)malloc(diskInfoSize);
如果(diskInfo==NULL)
{
opStatus=错误\u内存不足\u;
去清理;
}
storageType.DeviceId=虚拟存储设备未知;
storageType.VendorId=虚拟存储类型供应商未知;
//////////////////////////////////////////////////////////////////
opStatus=OpenVirtualDisk(
&存储类型,
VirtualDiskPath,
虚拟磁盘访问获取信息,
打开虚拟磁盘标志无,
无效的
&vhd手柄);
if(opStatus!=错误\u成功)
{
wprintf(L“OpenVirtualDisk失败\n”);
去清理;
}
opStatus=QueryChangesVirtualDisk(
拉手,
ChangeTrackingId,
0,
32212254720,
查询\u更改\u虚拟磁盘\u标志\u无,
pRctRanges,
&rctRangeCnt,
&加工长度
);
wprintf(L“rctRangeCnt:%lu\n”,rctRangeCnt);
wprintf(L“processedLength:%llu\n”,processedLength);
对于(i=0;i
问题在于,为范围
参数传递空指针,为范围计数
传递零指针
对于Ranges
您应该传递一个指向第一个元素或QUERY\u CHANGES\u VIRTUAL\u DISK\u RANGE
元素数组的指针,并且RangeCount
应该初始化为该数组中的元素数
当QueryChangesVirtualDisk
函数返回时,它将RangeCount
修改为范围
数组中的初始化元素数
从链接到的文档中,关于RangeCount
参数:
输入时,该值表示范围
参数指向的数组可以容纳的查询\u更改\u虚拟磁盘\u范围
结构的数量。在输出时,该值包含方法放置在数组中的QUERY\u CHANGES\u VIRTUAL\u DISK\u RANGE
结构的数量
简而言之:函数不会为您创建此数组,您必须在调用函数之前创建它。下次我应该更仔细地阅读文档。。。谢谢你的帮助me@TK_WooDong这在快照和正在运行的VM的基础磁盘上有效吗?还是在脱机VM上查询已更改的块?使用正在运行的VM,我的访问被拒绝。。有什么建议吗?
opStatus = QueryChangesVirtualDisk(
vhdHandle,
ChangeTrackingId,
0,
32212254720,
QUERY_CHANGES_VIRTUAL_DISK_FLAG_NONE,
pRctRanges,
&rctRangeCnt,
&processedLength
);
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <initguid.h>
#include <strsafe.h>
#include <virtdisk.h>
#include "Storage.h"
DWORD QueryChangesVirtualDisk(_In_ LPCWSTR VirtualDiskPath, _In_ LPCWSTR ChangeTrackingId)
{
VIRTUAL_STORAGE_TYPE storageType;
PGET_VIRTUAL_DISK_INFO diskInfo;
ULONG diskInfoSize;
DWORD opStatus;
HANDLE vhdHandle;
QUERY_CHANGES_VIRTUAL_DISK_RANGE *pRctRanges;
ULONG rctRangeCnt;
ULONG64 processedLength;
UINT i;
vhdHandle = INVALID_HANDLE_VALUE;
diskInfo = NULL;
diskInfoSize = sizeof(GET_VIRTUAL_DISK_INFO);
rctRangeCnt = 0L;
processedLength = 0L;
pRctRanges = NULL;
i = 0;
diskInfo = (PGET_VIRTUAL_DISK_INFO)malloc(diskInfoSize);
if (diskInfo == NULL)
{
opStatus = ERROR_NOT_ENOUGH_MEMORY;
goto Cleanup;
}
storageType.DeviceId = VIRTUAL_STORAGE_TYPE_DEVICE_UNKNOWN;
storageType.VendorId = VIRTUAL_STORAGE_TYPE_VENDOR_UNKNOWN;
//////////////////////////////////////////////////////////////////
opStatus = OpenVirtualDisk(
&storageType,
VirtualDiskPath,
VIRTUAL_DISK_ACCESS_GET_INFO,
OPEN_VIRTUAL_DISK_FLAG_NONE,
NULL,
&vhdHandle);
if (opStatus != ERROR_SUCCESS)
{
wprintf(L"OpenVirtualDisk fail\n");
goto Cleanup;
}
opStatus = QueryChangesVirtualDisk(
vhdHandle,
ChangeTrackingId,
0,
32212254720,
QUERY_CHANGES_VIRTUAL_DISK_FLAG_NONE,
pRctRanges,
&rctRangeCnt,
&processedLength
);
wprintf(L"rctRangeCnt : %lu\n", rctRangeCnt);
wprintf(L"processedLength : %llu\n", processedLength);
for (i = 0; i < rctRangeCnt; i++)
{
wprintf(L"ByteOffset : %lld ByteLength : %lld\n", pRctRanges[i].ByteOffset, pRctRanges[i].ByteLength);
}
if (opStatus != ERROR_SUCCESS)
{
wprintf(L"QueryChangesVirtualDisk fail\n");
goto Cleanup;
}
Cleanup:
if (opStatus == ERROR_SUCCESS)
{
wprintf(L"success\n");
}
else
{
wprintf(L"error = %u\n", opStatus);
}
if (vhdHandle != INVALID_HANDLE_VALUE)
{
CloseHandle(vhdHandle);
}
if (diskInfo != NULL)
{
free(diskInfo);
}
if (pRctRanges != NULL)
{
for (i = 0; i < rctRangeCnt; i++)
{
free(&pRctRanges[i]);
}
}
return opStatus;
}