DockPanel Suite Installation Tutorial

DockPanel Suite add the docking functionlity to C# application. The effect is similiar to the
docking effect in Visual Studio 2008.


Installation steps:
1. Download the dll at SourceForge.
2. Open Visual Studio, add reference to the dll
Step1

Step2

3. Add DockPanel to ToolBox

Step1

Step2

Step3

Step4

4. Drag DockPanel to Form 1

Step1

5. Change IsMdiContainer to true. Beware!!! This is crucial step, or your program will crash!!!

Step1

6. Add an new form (Form2)

Step1

boost asio for windows pipe bug -- ERROR_MORE_DATA

I encountered another asio bug today.
I created a pipe server and used a pipe client to send data to the server.
The server read 128 bytes for each read, but the client sends 65536 bytes for each write. When the server read the data, ::ReadFile returns ERROR_MORE_DATA.
Then it just crashed.

The root cause is at function "async_read_some_at" in the file "win_iocp_handle_service.hpp".

    DWORD bytes_transferred = 0;
    ptr.get()->Offset = offset & 0xFFFFFFFF;
    ptr.get()->OffsetHigh = (offset >> 32) & 0xFFFFFFFF;
    BOOL ok = ::ReadFile(impl.handle_,
        boost::asio::buffer_cast(buffer),
        static_cast(boost::asio::buffer_size(buffer)),
        &bytes_transferred, ptr.get());
    DWORD last_error = ::GetLastError();
    if (!ok && last_error != ERROR_IO_PENDING)
    {
      boost::asio::io_service::work work(this->get_io_service());
      ptr.reset();
      boost::system::error_code ec(last_error,
          boost::asio::error::get_system_category());
      iocp_service_.post(bind_handler(handler, ec, bytes_transferred));
    }
    else
    {
      ptr.release();
    }
  }

In the above code,

    if (!ok && last_error != ERROR_IO_PENDING)
    {
      boost::asio::io_service::work work(this->get_io_service());
      ptr.reset();
      boost::system::error_code ec(last_error,
          boost::asio::error::get_system_category());
      iocp_service_.post(bind_handler(handler, ec, bytes_transferred));
    }

Checks for any error. When last_error != ERROR_IO_PENDING, the function assumes that the call to ::ReadFile is failed, so it release ptr immediately. But when last_error is ERROR_MORE_DATA, the call is successful and the ReadComplete event will still be put in the complete queue. Since the ptr has been released, the LPOVERLAPPED returned by ::GetQueuedCompletionStatus points to invalid location and is causes crash.

The fix is simple, just change the code to

    if (!ok && (last_error != ERROR_IO_PENDING && last_error != ERROR_MORE_DATA) )
    {
      boost::asio::io_service::work work(this->get_io_service());
      ptr.reset();
      boost::system::error_code ec(last_error,
          boost::asio::error::get_system_category());
      iocp_service_.post(bind_handler(handler, ec, bytes_transferred));
    }

Great website

>http://www.gorillatraining.com
contains a lot of information about Windows programming reference

>http://thesource.ofallevil.com
contains a lot of information about Microsoft Corporation info

ruby-serial port on windows

mark this
#require "../serialport.so"

add this
Kernel::require "serialport"

swig & opencv & ruby

1.swig commands to link ruby & c++
swig -c++ -ruby Wrapper.i
ruby mkmf.rb Wrapper
make
ruby hello.rb

2.modify the makefile
2.1add the following lines below definition of CFLAGS & DLDFLAGS
CFLAGS += `pkg-config opencv --cflags`
DLDFLAGS += `pkg-config opencv --libs`

2.2 remove -arch ppc at following lines
DLDFLAGS = -L. -arch ppc -arch i386
LDSHARED = cc -arch ppc -arch i386 -pipe -bundle

3.If you don't want to mess your makefile

require 'mkmf'
$libs = append_library($libs, "stdc++")
$CFLAGS << " `pkg-config opencv --cflags`"
$LDFLAGS << " `pkg-config opencv --libs`"
create_makefile(ARGV[0])

from
http://developer.apple.com/releasenotes/OpenSource/PerlExtensionsRelNotes/index.html
% env ARCHFLAGS='-arch ppc' ruby extconf.rb
% make
% make install

OpenCV on Mac

New Setting:
1.
PKG_CONFIG_PATH=/opt/local/var/macports/software/opencv/1.0.0_0/opt/local/lib/pkgconfig: ${PKG_CONFIG_PATH}

2.
export PKG_CONFIG_PATH

3.
g++ `pkg-config --cflags opencv` `pkg-config --libs opencv` -o water watershed.cpp


g++ -c Wrapper.cxx `pkg-config opencv --cflags`
g++ -o hello Wrapper.o `pkg-config opencv --libs`
./hello



export PKG_CONFIG_PATH=/opt/local/lib/pkgconfig


Makefile:
#by lono kao, 970325
CXX = g++
CFLAGS += `pkg-config opencv --cflags`
LDFLAGS += `pkg-config opencv --libs`
#LTool/LImage
TARGET = deleteme
SRC = LTool/LImage.cpp deleteme.cpp
#SRC = a.c b.c
#OBJ = $(SRC:.c=.o)
all : $(TARGET)

$(TARGET) : $(TARGET).cpp
$(CXX) $(SRC) $(CFLAGS) $(LDFLAGS) -o $(TARGET)

.cpp.o : $*.cpp
$(CXX) $*.cpp $(CFLAGS) $(LDFLAGS) -o $*

clean :
rm -f $(OBJS) $(TARGET)