为什么SetupDiCallClassInstaller功能仅限于64位程序？ [英] Why is the SetupDiCallClassInstaller function restricted to 64 bit programs?

问题描述

试图从在32位模式编译的程序调用SetupDiCallClassInstaller无法在64位Windows。

Attempting to call SetupDiCallClassInstaller from a program compiled in 32 bit mode fails on 64 bit Windows.

显然，这是由设计，但我想知道原因。

Apparently this is by design, but I'd like to know the reason.

推荐答案

根据MSDN：

设备安装的：

32位版本的应用程序必须检查由UpdateDriverForPlugAndPlayDevices返回的值。如果返回值是ERROR_IN_WOW64，32位应用程序执行在64位平台上，并不能更新内置驱动程序。相反，它必须调用CreateProcess的（在Windows SDK文档中所述），启动64位版本的应用程序。然后，64位版本可以调用UpdateDriverForPlugAndPlayDevices，指定标识的64位版本的所有文件的位置FullInfPath参数。

The 32-bit version of the application must check the value returned by UpdateDriverForPlugAndPlayDevices. If the return value is ERROR_IN_WOW64, the 32-bit application is executing on a 64-bit platform and cannot update inbox drivers. Instead, it must call CreateProcess (described in the Windows SDK documentation) to start the 64-bit version of the application. The 64-bit version can then call UpdateDriverForPlugAndPlayDevices, specifying a FullInfPath parameter that identifies the location of the 64-bit versions of all files.

因此​​，它看起来就像是被设计来报告 ERROR_IN_WOW64 特别希望不要在WOW64工作的任何API，一个32位进程调用64位程序调用API

So it looks like any API that is designed to report ERROR_IN_WOW64 is specifically intended NOT to work in WOW64, a 32bit process has to invoke a 64bit process to call the API.

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