RelGotoPage 函数转到下一页而不是返回

如何解决RelGotoPage 函数转到下一页而不是返回

我当前在安装程序中定义的页面顺序是：

!insertmacro MUI_PAGE_WELCOME                             ; Welcome page
!insertmacro MUI_PAGE_DIRECTORY                           ; Select a directory
!define MUI_PAGE_CUSTOMFUNCTION_PRE CheckInstallDirectory ; Check selected directory
!insertmacro MUI_PAGE_COMPONENTS                          ; Choose install components
!define MUI_PAGE_CUSTOMFUNCTION_PRE SkipLicense           ; Component1's check before license page
!insertmacro MUI_PAGE_LICENSE "license.txt"               ; Component1's license
!define MUI_PAGE_CUSTOMFUNCTION_PRE SkipLicenseForComp2   ; Component2's check before license page
!insertmacro MUI_PAGE_LICENSE "License2.txt"              ; Component2's license
!insertmacro CUSTOM_PAGES                                 ; Custom install pages
!insertmacro MUI_PAGE_INSTFILES                           ; Install components' files
!insertmacro MUI_PAGE_FINISH                              ; Finish page

在下面定义的 CheckInstallDirectory 函数中，它检查最终用户是否选择了一个已经包含 .exe 的目录，否则安装程序会安装该目录。

如果目录存在，用户会看到一个带有“OK”和“CANCEL”按钮的弹出消息框。 “OK”选择应该简单地跳过接下来的几页并转到 MUI_PAGE_INSTFILES 页。 “取消”选项应将用户返回到 MUI_PAGE_DIRECTORY 页面。

Function CheckInstallDirectory

  IfFileExists "$INSTDIR\Component1.exe" file_found end_of_check
  file_found:
  Var /GLOBAL ver_
  ${GetFileVersion} "$INSTDIR\Component1.exe" $ver_
  StrCpy $0 $ver_ 1 ; Determine the major version of the installed exe (1st char of the returned string)
  StrCpy $1 $ver_1 1 ; Determine the major version of the exe we are installing (1st char of the returned string)
  ${If} $0 == $1
    ; The major version between .exe's is the same
    MessageBox MB_OKCANCEL|MB_ICONEXCLAMATION "A copy of this software is already installed in the selected directory.$\nSelect $\"OK$\" if you would like to update the software to the latest version.$\nOtherwise select $\"Cancel$\" to go back and select a different installation directory." IDOK OK IDCANCEL CANCEL
    OK:
      ; User selected to update this software - continue with the installation like normal
      StrCpy $R9 "7" ; Skip to the installation page
      Call RelGotoPage
      goto end_of_check
    CANCEL:
      StrCpy $R9 "-1" ; Go back to directory selection page
      Call RelGotoPage
      goto end_of_check
  ${Else}
    ; The major version between the .exe's is NOT the same - cannot update
    MessageBox MB_OK "A copy of this software is already installed in the selected directory.$\nIt is not part of the latest major-version group and cannot be updated. To update this installation,uninstall and use the installer to install the latest version.$\nOtherwise,select$\"OK$\" to go back and select a different installation directory."
    StrCpy $R9 "-1" ; Go back to directory selection page
    Call RelGotoPage
    goto end_of_check
  ${EndIf}
  end_of_check:

FunctionEnd

我找到了 NSIS 关于如何在安装程序页面 here 之间移动的说明。

Function RelGotoPage
  IntCmp $R9 0 0 Move Move
    StrCmp $R9 "X" 0 Move
      StrCpy $R9 "120"

  Move:
  SendMessage $HWNDPARENT "0x408" "$R9" ""
FunctionEnd

发生的问题是 StrCpy $R9 "7" 确实成功跳转到 MUI_PAGE_INSTFILES 页面。然而，StrCpy $R9 "-1" 不会返回到上一页（应该是 MUI_PAGE_DIRECTORY）。相反，如果在该弹出消息中选择了“取消”，则安装程序会转到下一页 MUI_PAGE_COMPONENTS。

这里有什么不正确？ 有没有更好的方法来达到预期的结果？

真诚感谢任何帮助！谢谢！

解决方法

在页面预回调中，页面未完全加载，我认为这就是 -1 无法正常工作的原因。 -1 如果您使用 MUI_PAGE_CUSTOMFUNCTION_SHOW 确实有效，但正确的方法是阻止页面更改：

!include MUI2.nsh
!insertmacro MUI_PAGE_WELCOME                             ; Welcome page
!define MUI_PAGE_CUSTOMFUNCTION_LEAVE CheckInstallDirectory
!insertmacro MUI_PAGE_DIRECTORY
...

Function CheckInstallDirectory
;Snipped
    MessageBox MB_OKCANCEL|MB_ICONEXCLAMATION "A copy of this software is already installed in the selected directory.$\nSelect $\"OK$\" if you would like to update the software to the latest version.$\nOtherwise select $\"Cancel$\" to go back and select a different installation directory." IDOK OK IDCANCEL CANCEL
    OK:
      ; User selected to update this software - continue with the installation like normal
      StrCpy $R9 "7" ; Skip to the installation page
      Call RelGotoPage
      goto end_of_check
    CANCEL:
      Abort
;Snipped
  end_of_check:
FunctionEnd