How do you send a windows message?

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bern11 - 02 Jun 2006 04:20 GMT

How do you send a windows message in the .net framework? Creating
messages is easy, so is intercepting messages, but I cannot find a .net
equivalent to the windows api sendmessage() function.

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Greg Young - 02 Jun 2006 04:22 GMT

[DllImport("user32.dll")]
public static extern int SendMessage(
int hWnd, // handle to destination window
uint Msg, // message
int wParam, // first message parameter
int lParam // second message parameter
);

Cheers,

Greg Young
MVP - C#
http://geekswithblogs.net/gyoung

> How do you send a windows message in the .net framework? Creating
> messages is easy, so is intercepting messages, but I cannot find a .net
> equivalent to the windows api sendmessage() function.

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bern11 - 03 Jun 2006 01:53 GMT

Well, yeah. I meant how do you do it within the .Net framework? What
is the point of having a Message class if you can't Send them?

I'm going to try one last gimmick I thought of, then I'm off to
#include <Windows.h> world....

> [DllImport("user32.dll")]
> public static extern int SendMessage(
[quoted text clipped - 13 lines]
>>messages is easy, so is intercepting messages, but I cannot find a .net
>>equivalent to the windows api sendmessage() function.

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bern11 - 03 Jun 2006 03:55 GMT

    I isolated the code that opened a second form out of the header and
into the .cpp file. That way the main form header didn't have to
include the 2nd form header, so I could then include the main form
header in the 2nd form header and declare a pointer as a member, which I
then set the 'this' pointer to, and then accessed the main form callback
through the pointer.

    It's not 1/2 a confusing as it sounds:

in MainForm.cpp:
    #include NewForm.h

    NewForm^ form2 = gcnew NewForm;
    form2->mainFormPtr = this;
    form2->ShowDialog();

in NewForm.h
    #include MainForm.h;
    ...
    Proj::MainForm^ mainFormPtr;

    mainFormPtr->ExecMemberFunction();

It was HeaderA including HeaderB which included HeaderA causing the
problem....

> Well, yeah. I meant how do you do it within the .Net framework?
> What is the point of having a Message class if you can't Send them?
[quoted text clipped - 19 lines]
>>> messages is easy, so is intercepting messages, but I cannot find a
>>> .net equivalent to the windows api sendmessage() function.

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William Sullivan - 02 Jun 2006 13:53 GMT

Check out pinvoke.net; they have several different versions and some good
info on the sendmessage function.

> How do you send a windows message in the .net framework? Creating
> messages is easy, so is intercepting messages, but I cannot find a .net
> equivalent to the windows api sendmessage() function.

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How do you send a windows message?

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