wix：从自定义dll获取安装位置

Question

我遇到了WiX和C ++自定义操作DLL的问题：我想从自定义操作dll获取.wxs文件中指定的安装位置，我使用的是WcaGetTargetPath，但此API不起作用。任何人都知道如何做到这一点？

WiX文件：

 <Directory Id="TARGETDIR" Name="SourceDir">
      <Directory Id="$(var.PlatformProgramFilesFolder)" Name="PFiles">
        <Directory Id="CompanyDir" Name="ABC">
          <Directory Id="PCMINSTALLDIR" Name="ClientMonitor">
            <Directory Id="STDSCIPTSDIR" Name="standard_scripts">
            </Directory>

            <Directory Id="CSTMSCIPTSDIR" Name="custom_scripts">
            </Directory>
          </Directory>
        </Directory>
      </Directory>
    </Directory>
.....
 <CustomAction Id="ChangeConfig"
                  BinaryKey="PcmConfig"
                  DllEntry="ModifyConfigFile"
                  Execute="deferred"
                  Return="check"
                  Impersonate="no"
                  HideTarget="no" />

<InstallExecuteSequence>
  <Custom Action="ChangeConfig" Before="InstallFinalize" />
</InstallExecuteSequence>

Custom Action method:

    LPWSTR pwzTargetPath = NULL;
    hr = WcaGetTargetPath(L"PCMINSTALLDIR", &pwzTargetPath);
    ExitOnFailure(hr, "Failed to get the PCM installation path.");