C / C++ / MFC Discussion Boards

David Crow2-Jul-08 5:47

2-Jul-08 5:47

Have you tried using a different address for lpdwOutBufferSize? Having it use the same address as dwInBufferSize seems odd.

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: SaferGetLevelInformation Fails!!!

krmed2-Jul-08 6:59

krmed

2-Jul-08 6:59

As noted, don't have lpdwOutBufferSize point to your dwInBufferSize variable.

Also, since you have lpQueryBuffer defined as a TCHAR, you should use

TCHAR lpQueryBuffer[MAX_PATH * 10] = _T("");

Karl - WK5M
PP-ASEL-IA (N43CS)
PGP Key: 0xDB02E193
PGP Key Fingerprint: 8F06 5A2E 2735 892B 821C 871A 0411 94EA DB02 E193

Re: SaferGetLevelInformation Fails!!!

krmed2-Jul-08 5:22

krmed

2-Jul-08 5:22

It would help if you show how you declare, define, and initialize your lpQueryBuffer, dwInBufferSize, and lpdwOutBufferSize.

When you changed the size of the lpQueryBuffer, did you also note that change by changing the dwInBufferSize value?

Karl - WK5M
PP-ASEL-IA (N43CS)
PGP Key: 0xDB02E193
PGP Key Fingerprint: 8F06 5A2E 2735 892B 821C 871A 0411 94EA DB02 E193

Drawing a grayscale Icon

__DanC__2-Jul-08 3:13

__DanC__

2-Jul-08 3:13

I am trying to create a grayscale version of an icon. I have extracted the icon and have an HICON but how would I create a grayscale version? I have been trying to figure it out and it seems I need to create an HDC and draw the icon into that but I am new to graphics and am a bit lost...

Re: Drawing a grayscale Icon

KarstenK2-Jul-08 3:39

KarstenK

2-Jul-08 3:39

hIconGrey = ::CopyImage( hIcon, IMAGE_ICON, 32, 32, LR_MONOCHROME );

too easy too find it D'Oh! | :doh:

Greetings from Germany

Re: Drawing a grayscale Icon

__DanC__2-Jul-08 3:44

__DanC__

2-Jul-08 3:44

Thanks for the reply but I have tried that and the image comes out just black and white, I need grayscale so the image looks like the original but no colour. Is there a way I can do that using that function?

Re: Drawing a grayscale Icon

Mark Salsbery2-Jul-08 6:53

Mark Salsbery

2-Jul-08 6:53

You need to convert RGB values to grayscale values.

The typically formula used is

BYTE 8bitGrayscaleValue = (0.30 * RedByte) + (0.59 * GreenByte) + (0.11 * BlueByte)

or the integer (no floating point) version:

BYTE 8bitGrayscaleValue = (BYTE)((((int)RedByte * 30) + ((int)GreenByte * 59) + ((int)BlueByte * 11)) / 100);

You could create a 24bpp DIB section the dimensions of the icon, select it
into a memory DC, and draw the icon on the memory DC. Then using the pointer
to the DIBSection's pixel bits, iterate through the RGB pixel values, converting
each to grayscale.

That's the easiest way I can think of to access the pixel data of an icon.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Drawing a grayscale Icon

Mark Salsbery2-Jul-08 6:59

Mark Salsbery

2-Jul-08 6:59

Also, this may help:

CreateGrayscaleIcon[^]

The use of GetPixel() and SetPixel() are way slower than accessing pixel data directly as I proposed
in my previous post, if that's an issue.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

typedef enum & typecasting [modified]

testcrap2-Jul-08 2:49

testcrap

2-Jul-08 2:49

im trying to implement this example (http://www.codeproject.com/KB/openGL/GLBase.aspx) into my own little app.
cause i want to learn opengl,c++ & oop.

my german compiler (VC++ 2008 Express Edition) tells me there is in an error in the code.
basicly it sais 'int' cannot be converted to VSYNC, converting into an enumeration requires an explicit typecasting.

code:

in misc.h:

...
typedef enum tagVSYNC
{
VSync_Default = 0x0001,
VSync_On = 0x0002,
VSync_Off = 0x0003

} VSYNC, *PVSYNC;

typedef struct
{
VSYNC Status;
HWND hWnd;
HDC hDC;
BYTE nBPP;
BYTE nRefresh;
bool bFullscreen;
bool bZoomed;

} RENDERARGS, *PRENDERARGS;
...

in WinMain.cpp:

...
RENDERARGS Args={0}; <-this is the line the compiler complains about
...

can someone please help me?

modified on Wednesday, July 2, 2008 11:55 AM

Re: typedef enum & typecasting

_AnsHUMAN_ 2-Jul-08 2:54

_AnsHUMAN_

2-Jul-08 2:54

testcrap wrote:
RENDERARGS Args={0};

This is used to initialize the elements of an array. RENDERARGS isn't an array

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: typedef enum & typecasting

David Crow2-Jul-08 4:53

David Crow

2-Jul-08 4:53

It is a legitimate statement. The problem is that Status is an enum.

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: typedef enum & typecasting

KarstenK2-Jul-08 3:09

KarstenK

2-Jul-08 3:09

there is no enum tagVSYNC for 0. Dead | X|

Greetings from Germany

Re: typedef enum & typecasting

testcrap2-Jul-08 3:17

testcrap

2-Jul-08 3:17

if i change typedef to

typedef enum tagVSYNC
{
VSync_Undefined = 0x0000,
VSync_Default = 0x0001,
VSync_On = 0x0002,
VSync_Off = 0x0003

} VSYNC, *PVSYNC;

the error stays the same.
if i remove "VSYNC Status;" from the struct RENDERARGS it gets initialized without a problem.
is there a quick way to initialize RENDERARGS with null?

Re: typedef enum & typecasting

KarstenK2-Jul-08 3:39

KarstenK

2-Jul-08 3:39

try a memset.

Greetings from Germany

Re: typedef enum & typecasting

testcrap2-Jul-08 3:41

testcrap

2-Jul-08 3:41

if i initialize Args with this line it works:
RENDERARGS Args={VSync_Undefined,0,0,0,0,0,0};

also a little test works:
tagVSYNC test=VSync_Undefined;
tagVSYNC test2=(tagVSYNC)0;

can i get this line to work with some trick?
tagVSYNC test=0;

thx 4 help so far !

Re: typedef enum & typecasting

David Crow2-Jul-08 4:59

David Crow

2-Jul-08 4:59

testcrap wrote:
can someone plaes help me?

Have you considered something like:

typedef struct tagRENDERARGS
{
    VSYNC Status;
    HWND hWnd;
    HDC hDC;
    BYTE nBPP;
    BYTE nRefresh;
    bool bFullscreen;
    bool bZoomed;
 
    tagRENDERARGS()
    {
        Status = VSync_Default;
        hWnd = 0;
        hDC = 0;
        nBPP = 0;
        nRefresh = 0;
        bFullscreen = 0;
        bZoomed = 0;
    }
 
} RENDERARGS, *PRENDERARGS;
...
RENDERARGS Args;

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: typedef enum & typecasting

testcrap2-Jul-08 5:55

testcrap

2-Jul-08 5:55

thats it!
thx

occupied port

George_George2-Jul-08 2:41

George_George

2-Jul-08 2:41

Hello everyone,

Any tool could be used to detect which process or module (e.g. DLL) is occupying a specific TCP port?

When I write code to bind to a specific port, there is always error says the port is occupied. I typed netstat but the port is never showed. Do I need some special parameter to netstat?

thanks in advance,
George

Re: occupied port

_AnsHUMAN_ 2-Jul-08 2:52

_AnsHUMAN_

2-Jul-08 2:52

telnet See here[^]

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: occupied port

George_George2-Jul-08 3:09

George_George

2-Jul-08 3:09

Hi AnShUmAn,

Using telnet, you can check whether a port is occupied, but you can never know which process occupied the port. Any comments?

regards,
George

Re: occupied port

Hamid_RT2-Jul-08 20:10

Hamid_RT

2-Jul-08 20:10

I think we have a counter for it(Im not sure).

Re: occupied port

George_George3-Jul-08 21:51

George_George

3-Jul-08 21:51

Hi Hamid,

I do not know how to use counter to monitor the port and which process is using the port. Could you more description about your idea please?

regards,
George

Re: occupied port

Hamid_RT4-Jul-08 0:21

Hamid_RT

4-Jul-08 0:21

You can use of PdhAddCounter for insert and monitor tcp/ip.

Re: occupied port

George_George4-Jul-08 1:00

George_George

4-Jul-08 1:00