-
|
Does anyone know why subprocess fails with a concatenated string? It works just fine with a string literal. # Uses Imported mode for py5
import javafx
import subprocess
import os
str1 = ""
str2 = ""
strConcat = ""
def btn1Action(event):
global str1
print("btn1 was hit.")
str1 = "python3 "
def btn2Action(event):
global str2
print("btn2 was hit.")
str2 = "/Users/xxxxx/hworld.py"
def btn3Action(event):
global strConcat
print("btn3 was hit.")
strConcat = str1 + str2
print(strConcat)
s = subprocess.check_call(strConcat, shell=True)
def setup():
size(300, 200, FX2D)
window_title('JavaFX Concatenation Demo')
canvas = get_surface().get_native()
root = canvas.getParent()
hbox = javafx.scene.layout.HBox(20)
btn1 = javafx.scene.control.Button('Str1')
btn1.setOnAction(btn1Action)
btn2 = javafx.scene.control.Button('Str2')
btn2.setOnAction(btn2Action)
btn3 = javafx.scene.control.Button('Join')
btn3.setOnAction(btn3Action)
hbox.getChildren().addAll(btn1,btn2,btn3)
root.getChildren().add(hbox) |
Beta Was this translation helpful? Give feedback.
Answered by
vsquared
Jul 1, 2025
Replies: 1 comment 4 replies
-
|
Not sure. What error message are you getting? Does |
Beta Was this translation helpful? Give feedback.
4 replies
-
|
I used to get the same message that I got with the prototype editor, but something strange happened when I tried running the demo this morning: it worked! Now I have to go back and try to figure out why the prototype editor fails: Sorry to waste your time. |
Beta Was this translation helpful? Give feedback.
-
|
No worries. Glad you worked it out. |
Beta Was this translation helpful? Give feedback.
-
|
Here's the prototype editor which does fail. I put it in a default Processing window so it would be similar to the demo. To use it and see the problem first create a .py file with a single line of code: print("Hello Python World!!") then open that file into the editor and press the run button. Error message is shown below. It fails right as it is asked to concatenate pyStr and fileStr (which is generated when you select a file to open). The other buttons and menu items aren't hooked up yet so just ignore them for the time being. You're supposed to see the output of your file in the logArea at the bottom of the editor. import javafx
import java.io.FileReader
import java.io.BufferedReader
import subprocess
import os
_wndW = 700
_wndH = 700
fileStr = ""
pyStr = "python3"
runStr = ""
global logArea
def myBtnAction(event):
global stage
stage.close()
def openAction(event):
global selectedFile, txtArea, fileStr
fileChooser = javafx.stage.FileChooser()
fileChooser.getExtensionFilters().add(fileChooser.ExtensionFilter("Python Files","*.py"))
selectedFile = fileChooser.showOpenDialog(stage)
fileStr = selectedFile.getAbsolutePath()
if(fileStr != None):
reader = java.io.FileReader(selectedFile)
buffer = java.io.BufferedReader(reader)
s1 = ""
while ((s1 := buffer.readLine()) != None):
txtArea.appendText(s1 + "\n")
buffer.close()
def saveAction(evnt):
print("Save mItem hit.")
def saveAsAction(evnt):
print("SaveAs mItem hit.")
def runAction(event):
global logArea, runStr
runStr = ('%s %s') % (pyStr,fileStr)
print(runStr)
if(runStr != None):
s = subprocess.check_output(runStr, shell=True)
logArea.appendText(s)
def stopAction(evnt):
print("Stop btn hit.")
def setup():
global stage,txtArea,logArea
size(_wndW,_wndH,FX2D)
window_title('Python Editor Prototype')
canvas = get_surface().get_native()
root = canvas.getParent()
scene = root.getScene()
stage = scene.getWindow()
hbox = javafx.scene.layout.HBox(20)
vbox = javafx.scene.layout.VBox()
txtArea = javafx.scene.control.TextArea()
logArea = javafx.scene.control.TextArea()
# **** MenuBar ****
fileMenu = javafx.scene.control.Menu("File")
mItemOpen = javafx.scene.control.MenuItem("Open")
mItemSave = javafx.scene.control.MenuItem("Save")
mItemSaveAs = javafx.scene.control.MenuItem("SaveAs...")
fileMenu.getItems().addAll(mItemOpen, mItemSave,mItemSaveAs)
mBar = javafx.scene.control.MenuBar()
mBar.getMenus().addAll(fileMenu)
# **** MenuItem Actions ****
mItemOpen.setOnAction(openAction)
mItemSave.setOnAction(saveAction)
mItemSaveAs.setOnAction(saveAsAction)
# **** Run Btn ****
arrw = javafx.scene.shape.Polygon()
arrw.getPoints().addAll(
90.0, 52.0,
90.0, 68.0,
100.0, 60.0
)
arrw.setStroke(javafx.scene.paint.Color.WHITE)
arrw.setFill(javafx.scene.paint.Color.BLUE)
runBtn = javafx.scene.control.Button()
runBtn.setStyle("-fx-background-radius:5em;"+
"-fx-min-width:24px;"+
"-fx-min-height:24px;"+
"-fx-max-width:30px;"+
"-fx-max-height:30px;"
)
runBtn.setGraphic(arrw)
runBtn.setOnAction(runAction)
# **** Stop Btn ****
stop = javafx.scene.shape.Polygon()
stop.getPoints().addAll(
90.0, 60.0,
90.0, 72.0,
102.0, 72.0,
102.0, 60.0
)
stop.setStroke(javafx.scene.paint.Color.WHITE)
stop.setFill(javafx.scene.paint.Color.RED)
stopBtn = javafx.scene.control.Button()
stopBtn.setStyle("-fx-background-radius:5em;"+
"-fx-min-width:24px;"+
"-fx-min-height:24px;"+
"-fx-max-width:30px;"+
"-fx-max-height:30px;"
)
stopBtn.setGraphic(stop)
stopBtn.setOnAction(stopAction)
# **** Quit Btn ****
quitBtn = javafx.scene.control.Button("Q")
quitBtn.setStyle("-fx-background-radius:5em;"+"-fx-min-width:24px;"+"-fx-min-height:24px;"+"-fx-max-width:30px;"+"-fx-max-height:30px;")
quitBtn.setOnAction(myBtnAction)
margin = javafx.geometry.Insets(10,0,0,20)
hbox.setMargin(mBar, margin)
hbox.setMargin(runBtn,margin)
hbox.setMargin(stopBtn,margin)
hbox.setMargin(quitBtn,margin)
hbox.getChildren().addAll(mBar, runBtn, stopBtn, quitBtn)
splitPane = javafx.scene.control.SplitPane()
splitPane.setOrientation(javafx.geometry.Orientation.VERTICAL)
sp1 = javafx.scene.layout.StackPane()
sp1.getChildren().add(txtArea)
sp2 = javafx.scene.layout.StackPane()
sp2.getChildren().add(logArea)
splitPane.getItems().addAll(sp1, sp2)
splitPane.setDividerPositions(0.8, 0.2)
margin = javafx.geometry.Insets(10)
vbox.getChildren().addAll(hbox,splitPane)
vbox.setVgrow(splitPane, javafx.scene.layout.Priority.ALWAYS)
vbox.setMargin(splitPane,margin)
root.getChildren().add(vbox)Error message: |
Beta Was this translation helpful? Give feedback.
-
|
This works better but the output goes to Thonny console instead of logArea of editor. |
Beta Was this translation helpful? Give feedback.
Answer selected by
vsquared
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
This works better but the output goes to Thonny console instead of logArea of editor.
runStr = ('%s %s') % (pyStr,fileStr)Need to use the following to direct output to logArea:
s = subprocess.check_output(runStr, shell=True)Original post was edited and should work as expected after changes.