`LPARAM` is a typedef for `LONG_PTR` which is a `long` (signed 32-bit) on win32 and `__int64` (signed 64-bit) on x86_64.

`WPARAM` is a typedef for `UINT_PTR` which is an `unsigned int` (unsigned 32-bit) on win32 and `unsigned __int64` (unsigned 64-bit) on x86_64.

[MSDN link][1]


  [1]: http://msdn.microsoft.com/en-us/library/aa383751%28VS.85%29.aspx

These typedefs go back to the 16-bit days.  Originally, `LPARAM` was a `long` (signed 32-bit) and `WPARAM` was a `WORD` (unsigned 16-bit), hence the [W and L][1].  Due to the common practice of passing casted pointers as message parameters, `WPARAM` was expanded to 32 bits on Win32, and both `LPARAM` and `WPARAM` were expanded to 64 bits on Win64.

In C#, you should use `IntPtr` for `LPARAM` and `UIntPtr` for WPARAM.

Note that despite the `LP` prefix, `LPARAM` is not a far pointer to an `ARAM`.


  [1]: http://blogs.msdn.com/b/oldnewthing/archive/2003/11/25/55850.aspx

LPARAM refers to a LONG_PTR and WPARAM refers to a UINT_PTR

On x86 they will be 4 bytes and on x64 they will be 8 bytes.

[Here:][1]

    typedef UINT_PTR WPARAM;
    typedef LONG_PTR LPARAM;

  [1]: http://msdn.microsoft.com/en-us/library/aa383751(VS.85).aspx


What you need my friend is http://www.pinvoke.net/

c++ in linux and windows 64bit tested, the most simple solution I found:

    #define WPARAM long long unsigned int
    #define LPARAM long long int

What is a &quot;delegate&quot; in Objective C&#39;s iPhone development?

Is there a way to detect locked tables in MySQL? I mean tables locked by the `LOCK TABLE table WRITE/READ` command.

&lt;sub&gt;(Note that readers interested in detecting *named* locks acquired with `GET_LOCK` should read https://stackoverflow.com/q/11034504/1709587 instead.)&lt;/sub&gt;

Detecting locked tables (locked by LOCK TABLE)

I know I&#39;m being lazy here and I should trawl the header files for myself, but what are the actual types for LPARAM and WPARAM parameters? Are they pointers, or four byte ints? I&#39;m doing some C# interop code and want to be sure I get it working on x64 systems.

What are the definitions for LPARAM and WPARAM?

<p>I know I'm being lazy here and I should trawl the header files for myself, but what are the actual types for LPARAM and WPARAM parameters? Are they pointers, or four byte ints? I'm doing some C# interop code and want to be sure I get it working on x64 systems.</p>


I am using an open source library to connect to my webserver. I was concerned that the webserver was going extremely slow and then I tried doing a simple test in Ruby and I got these results

&gt; Ruby program: 2.11seconds for 10 HTTP
&gt; GETs
&gt; 
&gt; Ruby program: 18.13seconds for 100 HTTP
&gt; GETs
&gt; 
&gt; C# library: 20.81seconds for 10 HTTP
&gt; GETs
&gt;
&gt; C# library: 36847.46seconds for 100 HTTP
&gt; GETs

I have profiled and found the problem to be this function:

    private HttpWebResponse GetRawResponse(HttpWebRequest request) {
      HttpWebResponse raw = null;
      try {
        raw = (HttpWebResponse)request.GetResponse(); //This line!
      }
      catch (WebException ex) {
        if (ex.Response is HttpWebResponse) {
          raw = ex.Response as HttpWebResponse;
        }
      }
      return raw;
    }

The marked line is takes over 1 second to complete by itself while the ruby program making 1 request takes .3 seconds. I am also doing all of these tests on 127.0.0.1, so network bandwidth is not an issue.  

**What could be causing this huge slow down?** 

**UPDATE**

Check out the changed benchmark results. I actually tested with 10 GETs and not 100, I updated the results. 

HttpWebRequest is extremely slow!

For winforms applications I&#39;m wondering what setup code should go in:

* MainForm() 

as opposed to 

* MainForm_Load(object sender, EventArgs e) 

Are there any best practice guidelines here?



What setup code should go in Form Constructors versus Form Load event?

What is the default access modifier for classes, methods, members, constructors, delegates and interfaces?



What are the default access modifiers in C#?

What are the key differences between `IEnumerable` `Count()` and `Length`?

Difference between IEnumerable Count() and Length

I&#39;ve recently had to look for a C# porting of the Protocol Buffers library originally developped by Google. And guess what, I found two projects owned both by two very well known persons here: [protobuf-csharp-port][1], written by [Jon Skeet][2] and [protobuf-net][3], written by [Marc Gravell][4]. My question is simple: which one do I have to choose ?   

I quite like Marc&#39;s solution as it seems to me closer to C# philisophy (for instance, you can just add attributes to the properties of existing class) and it looks like it can support .NET built-in types such as System.Guid. 

I am sure both of them are really great projects but what&#39;s your oppinion?


  [1]: http://code.google.com/p/protobuf-csharp-port/
  [2]: https://stackoverflow.com/users/22656/jon-skeet
  [3]: http://code.google.com/p/protobuf-net/
  [4]: https://stackoverflow.com/users/23354/marc-gravell

How to choose between protobuf-csharp-port and protobuf-net

Is there any way a program can crash before main()?

Is there any way a C/C++ program can crash before main()?

&gt; **Possible Duplicate:**  
&gt; [catch exception by pointer in C++](https://stackoverflow.com/questions/2023032/catch-exception-by-pointer-in-c)  

&lt;!-- End of automatically inserted text --&gt;

I always catch exceptions by value. e.g

    try{
    ...
    }
    catch(CustomException e){
    ...
    }

But I came across some code that instead had `catch(CustomException &amp;e)` instead. Is this a)fine b)wrong c)a grey area?


C++ catch blocks - catch exception by value or reference?

Why doesn&#39;t C++ support unsigned double syntax?

Unsigned double in C++?

I have the following code inside the .h file and I&#39;m not sure what does the assignment statement do and how is it called properly?

    virtual void yield() = 0;

I thought that the function returns a value of 0 by default but since this function returns void I am a little bit confused. Can anyone comment on this and maybe say how can I refer to this assignment, I mean how is it called in C++ jargon?

Thanks.

C++ header file and function declaration ending in &quot;= 0&quot;

I was trying to convert a QString to char* type by the following methods, but they don&#39;t seem to work.

    //QLineEdit *line=new QLineEdit();{just to describe what is line here}

    QString temp=line-&gt;text();
    char *str=(char *)malloc(10);
    QByteArray ba=temp.toLatin1();
    strcpy(str,ba.data());

Can you elaborate the possible flaw with this method, or give an alternative method?

QString to char* conversion

I am a complete Noob when it comes to GIT.  I have been just taking my first steps over the last few days.  I setup a repo on my laptop, pulled down the Trunk from an SVN project (had some issues with branches, not got them working), but all seems ok there.

I now want to be able to pull or push from the laptop to my main desktop.  The reason being the laptop is handy on the train as I spend 2 hours a day travelling and can get some good work done.  But my main machine at home is great for development.  So I want to be able to push / pull from the laptop to the main computer when I get home.  I thought the most simple way of doing this would be to just have the code folder shared out across the LAN and do:

    git clone file://192.168.10.51/code

unfortunately this doesn&#39;t seem to be working for me:

so I open a git bash cmd and type the above command, I am in C:\code (the shared folder for both machines) this is what I get back:

    Initialized empty Git repository in C:/code/code/.git/
    fatal: &#39;C:/Program Files (x86)/Git/code&#39; does not appear to be a git repository
    fatal: The remote end hung up unexpectedly

How can I share the repository between the two machines in the most simple of ways.

There will be other locations that will be official storage points and places where the other devs and CI server etc will pull from, this is just so that I can work on the same repo across two machines.

As per Sebastian&#39;s suggestion I get the following:

    C:\code&gt;git clone --no-hardlinks file://192.168.10.51/code
    Initialized empty Git repository in C:/code/code/.git/
    fatal: &#39;C:/Program Files (x86)/Git/code&#39; does not appear to be a git repository
    fatal: The remote end hung up unexpectedly


**EDIT - ANSWER **

Thanks to all that helped.  I tried the mapping a drive and that worked so thought I would go back and retry without mapping.  The final result was:

    git clone file://\\\\192.168.0.51\code

This worked great.

Thanks

GIT clone repo across local file system in windows

I have some demos that I downloaded and they come with a Makefile.win and a Makefile.sgi. How can I run these in Windows to compile the demos?

How to run a makefile in Windows?

I need to test if a variable is set or not.  I&#39;ve tried several techniques but they seem to fail whenever `%1` is surrounded by quotes such as the case when `%1` is `&quot;c:\some path with spaces&quot;`.

    IF NOT %1 GOTO MyLabel // This is invalid syntax
    IF &quot;%1&quot; == &quot;&quot; GOTO MyLabel // Works unless %1 has double quotes which fatally kills bat execution
    IF %1 == GOTO MyLabel // Gives an unexpected GOTO error.

According to [this site][1], these are the supported `IF` syntax types. So, I don&#39;t see a way to do it.

    IF [NOT] ERRORLEVEL number command
    IF [NOT] string1==string2 command
    IF [NOT] EXIST filename command

UPDATE: on 2020-10-25, I updated the accepted answer from using brackets to using a tilde.  Everyone says the tilde is better as it&#39;s more secure.  I&#39;m a little torn cause the tilde looks more complicated and is less clear as to what it&#39;s purpose is but nevertheless, I changed it.

  [1]: http://www.computerhope.com/if.htm

What is the proper way to test if a parameter is empty in a batch file?

I need to execute a command 100-200 times, and so far my research indicates that I would either have to copy/paste 100 copies of this command, OR use a `for` loop, but the `for` loop expects a list of items, hence I would need 200 files to operate on, or a list of 200 items, defeating the point.

I would rather not have to write a C program and go through the length of documenting why I had to write another program to execute my program for test purposes. Modification of my program itself is also not an option.

**So, given a command, `a`, how would I execute it `N` times via a batch script?**

*Note: I don&#39;t want an infinite loop*

For example, here is what it would look like in Javascript:

```js
var i;
for (i = 0; i &lt; 100; i++) {
  console.log( i );
} 
```

**What would it look like in a batch script running on Windows?**

Batch script loop

A windows batch file (`called.bat` or `called.cmd`) can be called from another batch file (`caller.bat` or `caller.cmd`) or interactive cmd.exe prompt in several ways:

 1. direct call: `called.bat`
 2. using call command: `call called.bat`
 3. using cmd command: `cmd /c called.bat`
 4. using start command: `start called.bat`

I&#39;m quite in trouble to differentiate their intended usage based on their help text: when to use which one? e.g. why I might use &#39;call&#39; command instead of direct call. What&#39;s different?

I&#39;m interested on some summary report that analyze all 4 possibilities (and others if any missing) from various point of views: recommended use cases for which they are designed to fit, process spawning, execution context, environment, return code processing.

Note: I&#39;m using Windows XP SP3.

Content Type	Original Author	Original Content on Stackoverflow
Question	Mark Heath	View Question on Stackoverflow
Solution 1 - C#	CB Bailey	View Answer on Stackoverflow
Solution 2 - C#	dan04	View Answer on Stackoverflow
Solution 3 - C#	Brian R. Bondy	View Answer on Stackoverflow
Solution 4 - C#	jpalecek	View Answer on Stackoverflow
Solution 5 - C#	SerialSeb	View Answer on Stackoverflow
Solution 6 - C#	superbem	View Answer on Stackoverflow

What are the definitions for LPARAM and WPARAM?

C# Problem Overview

C# Solutions

Solution 1 - C#

Solution 2 - C#

Solution 3 - C#

Solution 4 - C#

Solution 5 - C#

Solution 6 - C#

Detecting locked tables (locked by LOCK TABLE)

What is a "delegate" in Objective C's iPhone development?

Attributions