mirror of
https://github.com/QB64-Phoenix-Edition/QB64pe.git
synced 2024-06-29 10:30:36 +00:00
64 lines
2.5 KiB
Plaintext
64 lines
2.5 KiB
Plaintext
The [[CHDIR]] statement changes the program's location from one working directory to another by specifying a literal or variable [[STRING]] path.
|
|
|
|
|
|
{{PageSyntax}}
|
|
:[[CHDIR]] {{Parameter|path$}}
|
|
|
|
|
|
{{PageDescription}}
|
|
* {{Parameter|path$}} is the new directory path the program will work in.
|
|
* {{Parameter|path$}} can be an absolute path (starting from the root folder) or relative path (starting from the current program location).
|
|
* If {{Parameter|path$}} specifies a non-existing path, a [[ERROR Codes|"Path not found"]] error will occur.
|
|
* '''A QB64 [[SHELL]] statement cannot use "CD " or "CHDIR " + path$ to change directories.'''
|
|
|
|
|
|
{{PageExamples}}
|
|
''Example 1:'' The following code is Windows-specific:
|
|
{{CodeStart}} '' ''
|
|
{{Cl|CHDIR}} "C:\" 'change to the root drive C (absolute path)
|
|
{{Cl|CHDIR}} "DOCUME~1" 'change to "C:\Documents and Settings" from root drive (relative path)
|
|
{{Cl|CHDIR}} "..\" 'change back to previous folder one up '' ''
|
|
{{CodeEnd}}
|
|
:''Details:'' '''QB64''' can use long or short (8.3 notation) file and path names.
|
|
|
|
|
|
''Example 2:'' Using the Windows API to find the current program's name and root path. The PATH$ is a shared function value.
|
|
{{CodeStart}} '' ''
|
|
{{Cl|_TITLE}} "My program"
|
|
{{Cl|PRINT}} TITLE$
|
|
{{Cl|PRINT}} PATH$
|
|
|
|
{{Cl|FUNCTION}} TITLE$ ''=== SHOW CURRENT PROGRAM
|
|
{{Cl|SHARED}} PATH$ 'optional path information shared with main module only
|
|
{{Cl|DECLARE LIBRARY}} 'Directory Information using KERNEL32 provided by Dav
|
|
{{Cl|FUNCTION}} GetModuleFileNameA ({{Cl|BYVAL}} Module {{Cl|AS}} {{Cl|LONG}}, FileName {{Cl|AS}} {{Cl|STRING}}, {{Cl|BYVAL}} nSize {{Cl|AS}} {{Cl|LONG}})
|
|
{{Cl|DECLARE LIBRARY|END DECLARE}}
|
|
|
|
FileName$ = {{Cl|SPACE$}}(256)
|
|
Result = GetModuleFileNameA(0, FileName$, {{Cl|LEN}}(FileName$)) '0 designates the current program
|
|
{{Cl|IF...THEN|IF}} Result {{Cl|THEN}} 'Result returns the length or bytes of the string information
|
|
PATH$ = {{Cl|LEFT$}}(FileName$, Result)
|
|
start = 1
|
|
DO
|
|
posit = {{Cl|INSTR}}(start, PATH$, "\")
|
|
{{Cl|IF...THEN|IF}} posit {{Cl|THEN}} last = posit
|
|
start = posit + 1
|
|
{{Cl|LOOP}} {{Cl|UNTIL}} posit = 0
|
|
TITLE$ = {{Cl|MID$}}(PATH$, last + 1)
|
|
PATH$ = {{Cl|LEFT$}}(PATH$, last)
|
|
{{Cl|ELSE}} TITLE$ = "": PATH$ = ""
|
|
{{Cl|END IF}}
|
|
{{Cl|END FUNCTION}} '' ''
|
|
{{CodeEnd}}
|
|
: '''Note:''' The program's [[_TITLE]] name may be different from the actual program module's file name returned by Windows.
|
|
|
|
|
|
{{PageSeeAlso}}
|
|
* [[SHELL]], [[FILES]]
|
|
* [[MKDIR]], [[RMDIR]]
|
|
* [[$CONSOLE]]
|
|
|
|
|
|
{{PageNavigation}}
|
|
<
|