How to get output of program to variable?

[doscode]

Hello,
I am using Windows XP and batch file where I have this command:

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convert map2.png -format "%%wx%%h" info:

after executing it I see this: 256x158 and I need to save it to variable and then to
paste content of the variable to next command:

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convert

result.png -resize ...here to put the content of the variable...

I have no idea how can I get the result to variable. Is it possible to do it in single batch file?

[elias]

Hi,

It is not clear exactly what you are asking but from what I understood, you want to:
1. run a command
2. capture and parse its output
3. the parsed output should be passed to another command?


For (1) and (2), you may want to use the FOR /F syntax with the backquote to capture the output and parse it. Perhaps combine that with FINDSTR, etc.

After you capture the output into variables you can pass them to (3).

Study this example. I think it does what you are asking for:

https://github.com/PassingTheKnowledge/ ... Reveal.bat

[elzooilogico]

Hello,
I am using Windows XP and batch file where I have this command:

Code: Select all

convert map2.png -format "%%wx%%h" info:

after executing it I see this: 256x158 and I need to save it to variable and then to
paste content of the variable to next command:

Code: Select all

convert

result.png -resize ...here to put the content of the variable...
I have no idea how can I get the result to variable. Is it possible to do it in single batch file?

Your idea is not clear for me.

Are %%w & %%h for parameters or are common variables?

The sintax %%var is used only with for parameters in batch context (they are %var in commandline context).

If they are common variables they should be %w%x%h%

But, if I understand and the first command works for you, this may help

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rem if w & h are for parameters use
for /f "usebackq tokens=*" %%i in (`convert map2.png -format "%%wx%%h" info:`) do (
  for /f "usebackq tokens=*" %%n in (`convert result.png -resize %%i`) do (
     echo Output is %%n
  )
)

rem if w & h are standard variables use
for /f "usebackq tokens=*" %%i in (`convert map2.png -format "%w%x%h%" info:`) do (
  for /f "usebackq tokens=*" %%n in (`convert result.png -resize %%i`) do (
     echo Output is %%n
  )
)

%%i holds output of the first for command, and can be used by the second.

Also, you may split 256x158,

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for /f "usebackq tokens=1,2 delims=x" %%i in (`convert map2.png -format "%%wx%%h" info:`) do (
  rem if output is 256x158, now %%i=256 and %%j=158 
  for /f "usebackq tokens=*" %%n in (`convert result.png -resize %%ix%%j`) do (
     echo output is %%n
  )
)

[doscode]

Thanks for you help. This is what I needed:

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for /f "usebackq tokens=1" %%a in (`convert map2.png -format "%%wx%%h" info:`) do ( echo %%a )

after I run the batch then this is the output:

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>for /F "usebac
kq tokens=1" %a in (`convert map2.png -format "%wx%h" info:`) do (echo %a  )

I:\PC Improve\ImageMagick a GhostScript\Locate sub-image in image>(echo 256x158
 )
256x158

Correct!

Yet I am trying to save the variable from loop to different variable and display the content of the variable outside of the loop. This fails:

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for /f "usebackq tokens=1" %%o in (`convert map2.png -format "%%wx%%h" info:`) do (
  original_size_1 = %%o )
echo %%original_size_1 

output:

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>echo %original
_size_1
%original_size_1

[elzooilogico]

Yet I am trying to save the variable from loop to different variable and display the content of the variable outside of the loop. This fails:

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for /f "usebackq tokens=1" %%o in (`convert map2.png -format "%%wx%%h" info:`) do (
  original_size_1 = %%o )
echo %%original_size_1 

Please, read carefully the previous post.

%%var syntax is only used with for parameters. Common variables are referenced using %var% syntax. Also take care of the spaces when assigning and referencing variables. Also again, you need to use set to declare a variable.

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for /f "usebackq tokens=1" %%o in (`convert map2.png -format "%%wx%%h" info:`) do (
  set original_size_1=%%o 
)
echo %original_size_1% 

More, you may enclose the declaration and its content in quotes to avoid odd assigments. But consider the following

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Set "myvar1=This is a string"
Set myvar2="This is a string" 
echo %myvar1%
echo %myvar2%

Output is

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This is a string
"This is a string"

As you can see, myvar2 holds exactly "This is a string" where myvar1 holds This is a string, the quotes surrounding both "var-name=var-content" avoid (for instance) trailing spaces.

[doscode]

Outside loop I tried to reference by %var% but because of the other errors it did not work. Now works. Thanks

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for /f "usebackq tokens=1" %%o in (`convert map2.png -format "%%wx%%h" info:`) do (
  set original_size_1=%%o )
echo %original_size_1%