C / C++ / MFC Discussion Boards

Member 801032519-Dec-11 16:29

19-Dec-11 16:29

Hello all. I'm trying to synthesize alt + space to bring up the output window's menu using SendInput(). For some reason it works on other windows that I click on after compiling, but CMD windows just take it as a space key press. Here's what I have:

    Sleep(2500);

INPUT in1 = {INPUT_KEYBOARD};
INPUT in2 = {INPUT_KEYBOARD};
INPUT in3 = {INPUT_KEYBOARD};
INPUT in4 = {INPUT_KEYBOARD};
KEYBDINPUT k1 = {VK_MENU,0,0,0,0};
KEYBDINPUT k2 = {VK_SPACE,0,0,0,0};
KEYBDINPUT k3 = {VK_SPACE,0,KEYEVENTF_KEYUP,0,0};
KEYBDINPUT k4 = {VK_MENU,0,KEYEVENTF_KEYUP,0,0};
in1.ki = k1;
in2.ki = k2;
in3.ki = k3;
in4.ki = k4;
SendInput(1, &in1, sizeof(INPUT));
SendInput(1, &in2, sizeof(INPUT));
SendInput(1, &in3, sizeof(INPUT));
SendInput(1, &in4, sizeof(INPUT));

system("pause");

So this works in other windows and ignores the alt press in CMD windows. Snarl. The alt + space hot key works in CMD windows when I press the keys manually.

Re: SendInput()

Code-o-mat20-Dec-11 8:17

Code-o-mat

20-Dec-11 8:17

Just a guess but it could be that the key handler for those windows you want to target use GetKeyState[^] or GetAsynchKeyState[^] to check if the ALT key is down or not and SendInput does not change what these will return. I guess you could test for this by manually pressing the ALT key and sending the space with SendInput as you do.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<

Optimization

columbos1492719-Dec-11 3:41

columbos14927

19-Dec-11 3:41

I try to compile my project with "Maximize speed /o2"

But when i compile i get:

Command line error D8016 : /o2 and /RTC1 command line options are incompatible

Any one know what can i do about it?

Thanks

Re: Optimization

C^hris L^osinger19-Dec-11 4:12

C^hris L^osinger

19-Dec-11 4:12

you'll need to disable the "run time error checks" compiler option.

image processing toolkits | batch image processing

Re: Optimization

Code-o-mat19-Dec-11 4:13

Code-o-mat

19-Dec-11 4:13

Either turn off 'Optimize for speed' or 'Run Time Error Checks[^]' as they are apparently not compatible.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<

Adding a int array inside CStringArray

VCProgrammer19-Dec-11 1:07

VCProgrammer

19-Dec-11 1:07

Hi all,

i have made a CStringArray, and inside that array i have put 5 items of CString type, but i want to add one more item which is int array inside that item.

How can i do this?

Thanks in advance

Re: Adding a int array inside CStringArray

CPallini19-Dec-11 1:26

CPallini

19-Dec-11 1:26

What do you really need to do? Do you have to store the integers or their string representation?

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: Adding a int array inside CStringArray

Richard MacCutchan19-Dec-11 2:12

Richard MacCutchan

19-Dec-11 2:12

You need to rethink your design; don't mix different types in this way, it will likely lead to problems in the future.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Re: Adding a int array inside CStringArray

Albert Holguin19-Dec-11 3:12

Albert Holguin

19-Dec-11 3:12

+5, don't store an int array in a CStringArray

Re: Adding a int array inside CStringArray

Richard MacCutchan19-Dec-11 6:00

Richard MacCutchan

19-Dec-11 6:00

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Adapter Classes for using C++ library through JNI

pandit8419-Dec-11 0:26

pandit84

19-Dec-11 0:26

Hi ,
I have created C++ library(3 dlls) and I am using these library in my Java UI through JNI. In my JNI I am modifiying jobjectArray i.e. adding data inside my jobjectArray and returning it from JNI. Now my problem is if in future my C++ library changes I will have to change my JNI code. What should I do to 'tune' my JNI so that it will change with minimum impact. Does it require Adapter classes or wrapper clases. Any information on this will help me. Thanks

Re: Adapter Classes for using C++ library through JNI

CPallini19-Dec-11 3:12

CPallini

19-Dec-11 3:12

[Byrne voice]
Well we can't predict the future
But we're trying to do the best that we can
[/Byrne voice]

I suppose 'the best you can' here is: "follow the KISS principle, keep it simple".

Since you cannot predict the future changes, make your overall design simple and well documented.

CWinThread

columbos1492718-Dec-11 22:45

columbos14927

18-Dec-11 22:45

In the main thread of my app i do some work and once in a while i create another helper thread to do some job using: AfxBeginThread function which returns me a CWinThread object reference.

But before i will create once again the helper thread i have to be sure that the previous is done.

Now im using the CEvent object to signal from the helper thread that he is done but my app crashes sometimes.

Can i use the CWinThread object to find out whether the previous thread is done?

Thanks.

Re: CWinThread

CPallini18-Dec-11 23:12

CPallini

18-Dec-11 23:12

Have a look at MSDN documentation: "Multithreading: Terminating Threads"[^].
The "Retrieving the Exit Code of a Thread" section gives all info you need (read carefully the steps needed in order to retrieve the exit status of a CWinThread).

Re: CWinThread

Albert Holguin19-Dec-11 3:15

Albert Holguin

19-Dec-11 3:15

Think you probably need to figure out the cause of the crash (that's your main issue), but you can also use the main thread handle in the CWinThread to "wait on" (WaitForSingleObject).

Save As Image

john563218-Dec-11 22:08

john5632

18-Dec-11 22:08

Can I save drawn rectangle into an bmp image?

Re: Save As Image

CPallini18-Dec-11 22:18

CPallini

18-Dec-11 22:18

Yes, you may do, see here for a recipe[^], also have a look at this useful sample code[^].

Re: Save As Image

john563218-Dec-11 23:44

john5632

18-Dec-11 23:44

But how to save drawn rectagle into an image?

Re: Save As Image

CPallini18-Dec-11 23:51

CPallini

18-Dec-11 23:51

Drawn rectangle (drawn everything) is in 'the content' of current paint HDC (or CDC if you are using MFC), hence, for instance, inside the WM_PAINT message handler you may copy current paint HDC content into image HDC, using BitBlt function).

Re: Save As Image

john563219-Dec-11 0:24

john5632

19-Dec-11 0:24

Thanks for reply, but the link you suggested doing the same thing, I am confused to save image on specific path?????

Re: Save As Image

CPallini19-Dec-11 0:33

CPallini

19-Dec-11 0:33

Well, once you have the bits copied to the bitmap then you may save the bitmap itself. You may use, for instance CImage class (see, for instance "Save CBitmap to File"[^] or, if you want to go to the metal, see "Storing an Image"[^]

copying from large buffer to smaller

VCProgrammer18-Dec-11 21:21

VCProgrammer

18-Dec-11 21:21

Hi all,

i have two char buffers char a[1000],char a1[100].

i want to copy 100 value from a to a1, but everytime the index where we should start copying is different i.e. sometime it should start copying from a[100], other time from a[268].

For Copying from one buffer to another we can use function memcpy_s but it starts copying from zero.

Is there any alternate for this.

Thanks in advance

Re: copying from large buffer to smaller

CPallini18-Dec-11 21:52

CPallini

18-Dec-11 21:52

Just continue using memcpy_s starting from the right address, e.g.:

C++

errno_t result;
result = memcpy_s(a1, sizeof(a1), &a[268], sizeof(a1));

Re: copying from large buffer to smaller

VCProgrammer19-Dec-11 1:04

VCProgrammer

19-Dec-11 1:04

thanks its done

Re: copying from large buffer to smaller

CPallini19-Dec-11 1:24

CPallini

19-Dec-11 1:24

You are welcome.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.