Defined environment variables in .bat aren't assigned if we launch an administator-required application

The following problem appears only on Windows 10 and not on Windows 7.

I have an app (C++, Visual studio 2017), that requires administrator rights (flag /level='requireAdministrator' on the Linker). Here, I try to get environment variable RESOURCES:

Sample

  int main() {

  const char* buf;

  buf = getenv("RESOURCES");

  if (buf)

      cout << buf << endl;

  else

      cout << 0 << endl;



  system("pause");



  return 0;

}

On Windows 7, I used the following batch file without running it as administrator:

@echo off



set WORKING_DIR=%~dp0

set APP=%WORKING_DIR%ConsoleApplicationTest.exe

set RESOURCES=%WORKING_DIR%resources



start "" "%APP%"

As a result - on Windows 10 RESOURCES variable in the c++ code is empty, on the Windows 7 - correct path to the resources. Is the only solution on Windows 10 to launch the batch file as admin always?

edited Nov 21 '18 at 9:09

asked Nov 21 '18 at 8:00

N. Zolotavin

266

Here we go again. Everyday. DON'T USE START. What is wrong with set resources=%~dp0resources then %~dp0consoleapplicationtest.exe If they contain spaces enclose with quotes.

– CatCat
Nov 21 '18 at 8:07

@CatCat, Thanks for addition, but can you explain, why don't use start? I can't google it. Related to the topic - it doesn't solve a problem.

– N. Zolotavin
Nov 21 '18 at 9:03

Well, you specify very specifically that you require Administrator rights to run it, then you ask if you require administrator rights. Are you not answering your own question??

– Gerhard Barnard
Nov 21 '18 at 9:22

@CatCat Not good are %~dp0resources and %~dp0consoleapplicationtest.exe because of drive and path string referenced with %~dp0 always ends with a backlash. So concatenating this dynamic path string with an additional and a file or folder name results in having finally two backslashes in series in full qualified file/folder name. The Windows kernel functions for file/folder accesses automatically correct this small error, but it is nevertheless better using %~dp0resources and %~dp0consoleapplicationtest.exe although not so good readable, but being in real 100% right.

– Mofi
Nov 21 '18 at 9:36

1

@N.Zolotavin Please take a look on What is the reason for '...' is not recognized as an internal or external command, operable program or batch file? It explains in detail and with an example how Windows manages environment variables. Why does your application depend on environment variables set before by another application. Why do you not pass the resources path as command line argument to your application? Of course that would require changing int main() to int main(int argc, *argv) and making use of argument count and argument values.

– Mofi
Nov 21 '18 at 9:54

|
show 6 more comments

The following problem appears only on Windows 10 and not on Windows 7.

I have an app (C++, Visual studio 2017), that requires administrator rights (flag /level='requireAdministrator' on the Linker). Here, I try to get environment variable RESOURCES:

Sample

  int main() {

  const char* buf;

  buf = getenv("RESOURCES");

  if (buf)

      cout << buf << endl;

  else

      cout << 0 << endl;



  system("pause");



  return 0;

}

On Windows 7, I used the following batch file without running it as administrator:

@echo off



set WORKING_DIR=%~dp0

set APP=%WORKING_DIR%ConsoleApplicationTest.exe

set RESOURCES=%WORKING_DIR%resources



start "" "%APP%"

edited Nov 21 '18 at 9:09

asked Nov 21 '18 at 8:00

N. Zolotavin

266

Here we go again. Everyday. DON'T USE START. What is wrong with set resources=%~dp0resources then %~dp0consoleapplicationtest.exe If they contain spaces enclose with quotes.

– CatCat
Nov 21 '18 at 8:07

@CatCat, Thanks for addition, but can you explain, why don't use start? I can't google it. Related to the topic - it doesn't solve a problem.

– N. Zolotavin
Nov 21 '18 at 9:03

Well, you specify very specifically that you require Administrator rights to run it, then you ask if you require administrator rights. Are you not answering your own question??

– Gerhard Barnard
Nov 21 '18 at 9:22

@CatCat Not good are %~dp0resources and %~dp0consoleapplicationtest.exe because of drive and path string referenced with %~dp0 always ends with a backlash. So concatenating this dynamic path string with an additional and a file or folder name results in having finally two backslashes in series in full qualified file/folder name. The Windows kernel functions for file/folder accesses automatically correct this small error, but it is nevertheless better using %~dp0resources and %~dp0consoleapplicationtest.exe although not so good readable, but being in real 100% right.

– Mofi
Nov 21 '18 at 9:36

1

@N.Zolotavin Please take a look on What is the reason for '...' is not recognized as an internal or external command, operable program or batch file? It explains in detail and with an example how Windows manages environment variables. Why does your application depend on environment variables set before by another application. Why do you not pass the resources path as command line argument to your application? Of course that would require changing int main() to int main(int argc, *argv) and making use of argument count and argument values.

– Mofi
Nov 21 '18 at 9:54

|
show 6 more comments

The following problem appears only on Windows 10 and not on Windows 7.

I have an app (C++, Visual studio 2017), that requires administrator rights (flag /level='requireAdministrator' on the Linker). Here, I try to get environment variable RESOURCES:

Sample

  int main() {

  const char* buf;

  buf = getenv("RESOURCES");

  if (buf)

      cout << buf << endl;

  else

      cout << 0 << endl;



  system("pause");



  return 0;

}

On Windows 7, I used the following batch file without running it as administrator:

@echo off



set WORKING_DIR=%~dp0

set APP=%WORKING_DIR%ConsoleApplicationTest.exe

set RESOURCES=%WORKING_DIR%resources



start "" "%APP%"

edited Nov 21 '18 at 9:09

asked Nov 21 '18 at 8:00

N. Zolotavin

266

The following problem appears only on Windows 10 and not on Windows 7.

I have an app (C++, Visual studio 2017), that requires administrator rights (flag /level='requireAdministrator' on the Linker). Here, I try to get environment variable RESOURCES:

Sample

  int main() {

  const char* buf;

  buf = getenv("RESOURCES");

  if (buf)

      cout << buf << endl;

  else

      cout << 0 << endl;



  system("pause");



  return 0;

}

On Windows 7, I used the following batch file without running it as administrator:

@echo off



set WORKING_DIR=%~dp0

set APP=%WORKING_DIR%ConsoleApplicationTest.exe

set RESOURCES=%WORKING_DIR%resources



start "" "%APP%"

c++ batch-file windows-10 environment-variables

edited Nov 21 '18 at 9:09

asked Nov 21 '18 at 8:00

N. Zolotavin

266

edited Nov 21 '18 at 9:09

asked Nov 21 '18 at 8:00

N. Zolotavin

266

edited Nov 21 '18 at 9:09

asked Nov 21 '18 at 8:00

N. Zolotavin

266

asked Nov 21 '18 at 8:00

N. Zolotavin

266

asked Nov 21 '18 at 8:00

N. Zolotavin

266

Here we go again. Everyday. DON'T USE START. What is wrong with set resources=%~dp0resources then %~dp0consoleapplicationtest.exe If they contain spaces enclose with quotes.

– CatCat
Nov 21 '18 at 8:07

@CatCat, Thanks for addition, but can you explain, why don't use start? I can't google it. Related to the topic - it doesn't solve a problem.

– N. Zolotavin
Nov 21 '18 at 9:03

Well, you specify very specifically that you require Administrator rights to run it, then you ask if you require administrator rights. Are you not answering your own question??

– Gerhard Barnard
Nov 21 '18 at 9:22

@CatCat Not good are %~dp0resources and %~dp0consoleapplicationtest.exe because of drive and path string referenced with %~dp0 always ends with a backlash. So concatenating this dynamic path string with an additional and a file or folder name results in having finally two backslashes in series in full qualified file/folder name. The Windows kernel functions for file/folder accesses automatically correct this small error, but it is nevertheless better using %~dp0resources and %~dp0consoleapplicationtest.exe although not so good readable, but being in real 100% right.

– Mofi
Nov 21 '18 at 9:36

1

@N.Zolotavin Please take a look on What is the reason for '...' is not recognized as an internal or external command, operable program or batch file? It explains in detail and with an example how Windows manages environment variables. Why does your application depend on environment variables set before by another application. Why do you not pass the resources path as command line argument to your application? Of course that would require changing int main() to int main(int argc, *argv) and making use of argument count and argument values.

– Mofi
Nov 21 '18 at 9:54

|
show 6 more comments

Here we go again. Everyday. DON'T USE START. What is wrong with set resources=%~dp0resources then %~dp0consoleapplicationtest.exe If they contain spaces enclose with quotes.

– CatCat
Nov 21 '18 at 8:07

@CatCat, Thanks for addition, but can you explain, why don't use start? I can't google it. Related to the topic - it doesn't solve a problem.

– N. Zolotavin
Nov 21 '18 at 9:03

Well, you specify very specifically that you require Administrator rights to run it, then you ask if you require administrator rights. Are you not answering your own question??

– Gerhard Barnard
Nov 21 '18 at 9:22

@CatCat Not good are %~dp0resources and %~dp0consoleapplicationtest.exe because of drive and path string referenced with %~dp0 always ends with a backlash. So concatenating this dynamic path string with an additional and a file or folder name results in having finally two backslashes in series in full qualified file/folder name. The Windows kernel functions for file/folder accesses automatically correct this small error, but it is nevertheless better using %~dp0resources and %~dp0consoleapplicationtest.exe although not so good readable, but being in real 100% right.

– Mofi
Nov 21 '18 at 9:36

1

@N.Zolotavin Please take a look on What is the reason for '...' is not recognized as an internal or external command, operable program or batch file? It explains in detail and with an example how Windows manages environment variables. Why does your application depend on environment variables set before by another application. Why do you not pass the resources path as command line argument to your application? Of course that would require changing int main() to int main(int argc, *argv) and making use of argument count and argument values.

– Mofi
Nov 21 '18 at 9:54

Here we go again. Everyday. DON'T USE START. What is wrong with set resources=%~dp0resources then %~dp0consoleapplicationtest.exe If they contain spaces enclose with quotes.

– CatCat
Nov 21 '18 at 8:07

@CatCat, Thanks for addition, but can you explain, why don't use start? I can't google it. Related to the topic - it doesn't solve a problem.

– N. Zolotavin
Nov 21 '18 at 9:03

Well, you specify very specifically that you require Administrator rights to run it, then you ask if you require administrator rights. Are you not answering your own question??

– Gerhard Barnard
Nov 21 '18 at 9:22

@CatCat Not good are %~dp0resources and %~dp0consoleapplicationtest.exe because of drive and path string referenced with %~dp0 always ends with a backlash. So concatenating this dynamic path string with an additional and a file or folder name results in having finally two backslashes in series in full qualified file/folder name. The Windows kernel functions for file/folder accesses automatically correct this small error, but it is nevertheless better using %~dp0resources and %~dp0consoleapplicationtest.exe although not so good readable, but being in real 100% right.

– Mofi
Nov 21 '18 at 9:36

@N.Zolotavin Please take a look on What is the reason for '...' is not recognized as an internal or external command, operable program or batch file? It explains in detail and with an example how Windows manages environment variables. Why does your application depend on environment variables set before by another application. Why do you not pass the resources path as command line argument to your application? Of course that would require changing int main() to int main(int argc, *argv) and making use of argument count and argument values.

– Mofi
Nov 21 '18 at 9:54

|
show 6 more comments

1 Answer
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Your problem is that if the cmd instance running the batch file is not elevated, but your executable file requires elevation then the Application Information Service/UAC processes will handle the new process creation and will not transfer the cmd environment block (more here and here).

So, without changing the program code you only have two options: execute the cmd instance as administrator or set the variable as a system environment variable (yes, that requires an elevated process)

answered Nov 21 '18 at 11:35

MC ND

58.7k54882

The links are very helpful. Thank you.

– N. Zolotavin
Nov 21 '18 at 11:47

add a comment |

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answered Nov 21 '18 at 11:35

MC ND

58.7k54882

The links are very helpful. Thank you.

– N. Zolotavin
Nov 21 '18 at 11:47

add a comment |

answered Nov 21 '18 at 11:35

MC ND

58.7k54882

The links are very helpful. Thank you.

– N. Zolotavin
Nov 21 '18 at 11:47

add a comment |

answered Nov 21 '18 at 11:35

MC ND

58.7k54882

answered Nov 21 '18 at 11:35

MC ND

58.7k54882

answered Nov 21 '18 at 11:35

MC ND

58.7k54882

answered Nov 21 '18 at 11:35

MC ND

58.7k54882

answered Nov 21 '18 at 11:35

MC ND

58.7k54882

The links are very helpful. Thank you.

– N. Zolotavin
Nov 21 '18 at 11:47

add a comment |

The links are very helpful. Thank you.

– N. Zolotavin
Nov 21 '18 at 11:47

The links are very helpful. Thank you.

– N. Zolotavin
Nov 21 '18 at 11:47

add a comment |

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