Simon Kröger
1/22/2006 9:00:00 PM
Jon Egil Strand wrote:
> [...]
> No need to elaborate, you all understand how 200 blinking DOS-windows does
> not look good. The number to aim for here is 0. How can this be done?
The windows are your complete problem?
look at this, you can uses it like
io = popen('ver')
puts io.read_all
or
io = popen('cmd')
io.write("ping localhost\nexit\n")
while !(buffer = io.read).empty?
print buffer.gsub("\r", '')
end
and there is no window poping up. (does work for windows only, but that
seems to be ok for you, right?)
Here is the complete code, i posted this 11.09.2005 on this list.
cheers
Simon
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require 'Win32API'
$stdout.sync = true
NORMAL_PRIORITY_CLASS = 0x00000020
STARTUP_INFO_SIZE = 68
PROCESS_INFO_SIZE = 16
SECURITY_ATTRIBUTES_SIZE = 12
ERROR_SUCCESS = 0x00
FORMAT_MESSAGE_FROM_SYSTEM = 0x1000
FORMAT_MESSAGE_ARGUMENT_ARRAY = 0x2000
HANDLE_FLAG_INHERIT = 1
HANDLE_FLAG_PROTECT_FROM_CLOSE =2
STARTF_USESHOWWINDOW = 0x00000001
STARTF_USESTDHANDLES = 0x00000100
def raise_last_win_32_error
errorCode = Win32API.new("kernel32", "GetLastError", [], 'L').call
if errorCode != ERROR_SUCCESS
params = [
'L', # IN DWORD dwFlags,
'P', # IN LPCVOID lpSource,
'L', # IN DWORD dwMessageId,
'L', # IN DWORD dwLanguageId,
'P', # OUT LPSTR lpBuffer,
'L', # IN DWORD nSize,
'P', # IN va_list *Arguments
]
formatMessage = Win32API.new("kernel32", "FormatMessage", params, 'L')
msg = ' ' * 255
msgLength = formatMessage.call(FORMAT_MESSAGE_FROM_SYSTEM +
FORMAT_MESSAGE_ARGUMENT_ARRAY, '', errorCode, 0, msg, 255, '')
msg.gsub!(/\000/, '')
msg.strip!
raise msg
else
raise 'GetLastError returned ERROR_SUCCESS'
end
end
def create_pipe # returns read and write handle
params = [
'P', # pointer to read handle
'P', # pointer to write handle
'P', # pointer to security attributes
'L'] # pipe size
createPipe = Win32API.new("kernel32", "CreatePipe", params, 'I')
read_handle, write_handle = [0].pack('I'), [0].pack('I')
sec_attrs = [SECURITY_ATTRIBUTES_SIZE, 0, 1].pack('III')
raise_last_win_32_error if createPipe.Call(read_handle,
write_handle, sec_attrs, 0).zero?
[read_handle.unpack('I')[0], write_handle.unpack('I')[0]]
end
def set_handle_information(handle, flags, value)
params = [
'L', # handle to an object
'L', # specifies flags to change
'L'] # specifies new values for flags
setHandleInformation = Win32API.new("kernel32",
"SetHandleInformation", params, 'I')
raise_last_win_32_error if setHandleInformation.Call(handle,
flags, value).zero?
nil
end
def close_handle(handle)
closeHandle = Win32API.new("kernel32", "CloseHandle", ['L'], 'I')
raise_last_win_32_error if closeHandle.call(handle).zero?
end
def create_process(command, stdin, stdout, stderror)
params = [
'L', # IN LPCSTR lpApplicationName
'P', # IN LPSTR lpCommandLine
'L', # IN LPSECURITY_ATTRIBUTES lpProcessAttributes
'L', # IN LPSECURITY_ATTRIBUTES lpThreadAttributes
'L', # IN BOOL bInheritHandles
'L', # IN DWORD dwCreationFlags
'L', # IN LPVOID lpEnvironment
'L', # IN LPCSTR lpCurrentDirectory
'P', # IN LPSTARTUPINFOA lpStartupInfo
'P'] # OUT LPPROCESS_INFORMATION lpProcessInformation
startupInfo = [STARTUP_INFO_SIZE, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW, 0,
0, 0, stdin, stdout, stderror].pack('IIIIIIIIIIIISSIIII')
processInfo = [0, 0, 0, 0].pack('IIII')
command << 0
createProcess = Win32API.new("kernel32", "CreateProcess", params, 'I')
raise_last_win_32_error if createProcess.call(0,
command, 0, 0, 1, 0, 0, 0, startupInfo, processInfo).zero?
hProcess, hThread, dwProcessId, dwThreadId = processInfo.unpack('LLLL')
close_handle(hProcess)
close_handle(hThread)
[dwProcessId, dwThreadId]
end
def write_file(hFile, buffer)
params = [
'L', # handle to file to write to
'P', # pointer to data to write to file
'L', # number of bytes to write
'P', # pointer to number of bytes written
'L'] # pointer to structure for overlapped I/O
written = [0].pack('I')
writeFile = Win32API.new("kernel32", "WriteFile", params, 'I')
raise_last_win_32_error if writeFile.call(hFile, buffer, buffer.size,
written, 0).zero?
written.unpack('I')[0]
end
def read_file(hFile)
params = [
'L', # handle of file to read
'P', # pointer to buffer that receives data
'L', # number of bytes to read
'P', # pointer to number of bytes read
'L'] #pointer to structure for data
number = [0].pack('I')
buffer = ' ' * 255
readFile = Win32API.new("kernel32", "ReadFile", params, 'I')
return '' if readFile.call(hFile, buffer, 255, number, 0).zero?
buffer[0...number.unpack('I')[0]]
end
def peek_named_pipe(hFile)
params = [
'L', # handle to pipe to copy from
'L', # pointer to data buffer
'L', # size, in bytes, of data buffer
'L', # pointer to number of bytes read
'P', # pointer to total number of bytes available
'L'] # pointer to unread bytes in this message
available = [0].pack('I')
peekNamedPipe = Win32API.new("kernel32", "PeekNamedPipe", params, 'I')
return -1 if peekNamedPipe.Call(hFile, 0, 0, 0, available, 0).zero?
available.unpack('I')[0]
end
class Win32popenIO
def initialize (hRead, hWrite)
@hRead = hRead
@hWrite = hWrite
end
def write data
write_file(@hWrite, data.to_s)
end
def read
sleep(0.01) while peek_named_pipe(@hRead).zero?
read_file(@hRead)
end
def read_all
all = ''
while !(buffer = read).empty?
all << buffer
end
all
end
end
def popen(command)
# create 3 pipes
child_in_r, child_in_w = create_pipe
child_out_r, child_out_w = create_pipe
child_error_r, child_error_w = create_pipe
# Ensure the write handle to the pipe for STDIN is not inherited.
set_handle_information(child_in_w, HANDLE_FLAG_INHERIT, 0)
set_handle_information(child_out_r, HANDLE_FLAG_INHERIT, 0)
set_handle_information(child_error_r, HANDLE_FLAG_INHERIT, 0)
processId, threadId = create_process(ENV['ComSpec'] + ' /C ' +
command, child_in_r, child_out_w, child_error_w)
# we have to close the handles, so the pipes terminate with the process
close_handle(child_in_r)
close_handle(child_out_w)
close_handle(child_error_w)
Win32popenIO.new(child_out_r, child_in_w)
end
if $0 == __FILE__
io = popen('ver')
puts io.read_all
io = popen('cmd')
io.write("ping localhost\nexit\n")
while !(buffer = io.read).empty?
print buffer.gsub("\r", '')
end
end
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