在開發windows VSS應用程序時 我們應該先下載相關SDK，微軟描述如下
When developing your own VSS application, you should observe the following guidelines and restrictions. You may find it helpful to refer to the sample code for VSS requesters, providers, and writers that is provided in the Microsoft Windows Software Development Kit (SDK).
Windows Server 2003 R2, Windows Server 2003, and Windows XP: VSS is available in the Volume Shadow Copy Service 7.2 SDK, which you can download from http://www.microsoft.com/downloads/details.aspx?FamilyID=0b4f56e4-0ccc-4626-826a-ed2c4c95c871. Note that the 64-bit vssapi.lib files in the directories under the Win2003\Obj directory can be used for the 64-bit versions of Windows Server 2003 R2, Windows Server 2003, and Windows XP. This SDK also provides sample code for VSS requesters, providers, and writers.
Compiling VSS Applications
When developing a requester, such as a backup application:
- Include the following headers:
- Vss.h
- VsWriter.h
- VsBackup.h
- Link the following library:
- VssApi.Lib
When developing a writer:
- Include the following headers:
- Vss.h
- VsWriter.h
Link the following library:
- VssApi.lib
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- 還有一些注意事項（就是各種限制，部分內容翻譯一下）
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- All 32-bit VSS applications (requesters, providers, and writers) must run as native 32-bit or 64-bit applications. Running them under WOW64 is not supported.
Windows Server 2003 and Windows XP: Running 32-bit VSS requesters under WOW64 is supported, but not for system-state backups. Running 32-bit VSS providers and writers under WOW64 is not supported. Support for running 32- bit requesters under WOW64 was removed in Windows Vista and subsequent versions.
所有32位vss的應用程序（請求者，提供者，寫入者）必須作為原生的32位或64為程序運行。不支持WOW64位下運行。（關於WOW64，就是32bit程序運行在64bit下，是wow64模式）
Windows Server 2003 and Windows XP：可以再WOW64下運行32位vss請求者程序，但不能進行system-state備份。32位的提供者與寫入者不能再wow64下運行，並在vista及以后的系統中32位請求者也不能在wow64位下運行了。（總之就是不讓你用32位程序在64位下運行了。）
- A shadow copy that was created on Windows Server 2003 R2 or Windows Server 2003 cannot be used on a computer that is running Windows Server 2008 R2 or Windows Server 2008. A shadow copy that was created on Windows Server 2008 R2 or Windows Server 2008 cannot be used on a computer that is running Windows Server 2003. However, a shadow copy that was created on Windows Server 2008 can be used on a computer that is running Windows Server 2008 R2, and vice versa.
- 在windows2003或2003r2下創建的卷映射拷貝不能再windows2008或windows2008r2上運行，相反的情況也是如此（反之亦然）。然而，在windows2008下創建的卷映射拷貝可以再windows2008r2下運行，反之亦然。
- To support shadow copies, a system running VSS must have at least one NTFS file system. This file system will host the shadow copy's "diff area." For more information, see System Provider.
為了支持卷映射拷貝，系統運行vss至少必須運行在NTFS文件系統上。這個文件系統將負責（提供）卷映射拷貝的“差異區間”。了解更多請點擊上面的鏈接。
- Given the presence of one NTFS file system, and given the appropriate choice of context (see Shadow Copy Context Configurations), any supported local file system can be shadow copied.
- You can make shadow copies only for locally mounted file systems. Remote shares and other cross-mounted file systems cannot be shadow copied by the system that mounts them. These file systems can be shadow copied only by the systems that serve out the file systems.
- 你只能在本地文件系統上加載卷映射拷貝服務。遠程共享和其他交叉加載的文件系統不能加載卷映射拷貝，文件系統能運行卷映射拷貝僅能通過系統提供的文件系統。
- Writers and requesters should specify only local resources. Local resources are sets of files whose absolute path starts with a drive letter, and the drive letter cannot be associated with a mounted folder on a remote share.
- The maximum number is of software shadow copies for each volume is 512. However, by default you can only maintain 64 shadow copies that are used by the Shadow Copies of Shared Folders feature. To change the limit for the Shadow Copies of Shared Folders feature, use the MaxShadowCopies registry key.
- The Backup Components infrastructure does not support backing up cluster resources as writer components. To back up cluster resources, applications should assume that the path is local to a specified particular cluster node.
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Note Microsoft does not provide developer or IT professional technical support for implementing online system state restores on Windows (all releases).
When backing up and recovering system state, the recommended strategy is to back up and recover the system and boot volumes in addition to the files enumerated by the system state writers.
Note System state writers are writers that have the VSS_USAGE_TYPE attribute set to either VSS_UT_BOOTABLESYSTEMSTATE or VSS_UT_SYSTEMSERVICE.
下一篇將提供具體的使用方法。。。
- All 32-bit VSS applications (requesters, providers, and writers) must run as native 32-bit or 64-bit applications. Running them under WOW64 is not supported.