Re: Load Bitmap with CreateCompatibleBitmap - C / C++ / MFC Discussion Boards

Re: Call a extern variable from Application class

Richard MacCutchan13-Mar-11 4:23

13-Mar-11 4:23

You do not need to apologise for your English; most of us have no other language.

However, do try and respond as clearly as you can when people ask for more information on your questions. Most of the time they are trying to help to solve your problem, and understanding your question is the first step.

I must get a clever new signature for 2011.

Re: Call a extern variable from Application class

Jokcy14-Mar-11 21:40

Jokcy

14-Mar-11 21:40

OK.I will.Once again thank you for your advice. Smile | :)

Load Bitmap with CreateCompatibleBitmap

leorex12-Mar-11 16:23

leorex

12-Mar-11 16:23

I was browsing through the web and trying to find the method of double buffering to load an bmp image. I get all the example, except I can't seems to find anyway to actually draw the bmp file into the memhdc. to be precise I will get an example code here.

hdc_mem = CreateCompatibleDC(hDC);

bmp_mem = CreateCompatibleBitmap(hDC, 80, 25);

hdc_mem = LoadBitmap(hInst, MAKEINTRESOURCE(ID_for_BMP)); // problematic line

SelectObject(hdc_mem, bmp_mem);

BitBlt(hDC, 100, 50, 180, 75, hdc_mem, 0, 0, SRCCOPY);

DeleteDC (hDC);

DeleteDC (hdc_mem);

DeleteObject (bmp_button);

In the part where I should write stuff into hdc_mem, and I did LoadBitmapbut nothing is drawn on the screen. If i take the LoadBitmap line away, it will draw me a black box.
what should I do? any links for any example?

Re: Load Bitmap with CreateCompatibleBitmap

bob1697212-Mar-11 18:07

bob16972

12-Mar-11 18:07

You code does not suggest you are attempting to double buffer but since that is the topic you stated you are trying to understand, I would suggest this article first. (Your question will be answered indirectly in there)

Flicker Free Drawing In MFC[^]

Re: Load Bitmap with CreateCompatibleBitmap

leorex12-Mar-11 18:11

leorex

12-Mar-11 18:11

ahh its MFC.. please gimme some winapi/C example tyvm Big Grin | :-D

Re: Load Bitmap with CreateCompatibleBitmap

bob1697212-Mar-11 19:55

bob16972

12-Mar-11 19:55

Are you seriously trying to tell me that you can't derive the WIN32 from the simple MFC wrappers? Most C/C++ programmers could easily convert between the two since all it really encapsulates (loosely) are the handles.

You're kidding right? Suspicious | :suss:

Re: Load Bitmap with CreateCompatibleBitmap

Richard MacCutchan12-Mar-11 22:49

Richard MacCutchan

12-Mar-11 22:49

LoadBitmap() returns a handle to a BitMap not a device cobntext, see here[^].

I must get a clever new signature for 2011.

Re: Load Bitmap with CreateCompatibleBitmap

Hans Dietrich13-Mar-11 0:15

Hans Dietrich

13-Mar-11 0:15

Try this:

BITMAP bm = { 0 };
HBITMAP hbm = LoadBitmap(hInst, MAKEINTRESOURCE(ID_for_BMP)); // problematic line
if (hbm && GetObject(hbm, sizeof(BITMAP), &bm))
{
    hdc_mem = CreateCompatibleDC(hDC);
    SelectObject(hdc_mem, hbm);
    BitBlt(hDC, 100, 50, bm.bmWidth, bm.bmHeight, hdc_mem, 0, 0, SRCCOPY);
}

Best wishes,
Hans

[Hans Dietrich Software]

Gdplus::Color to DWORD

csrss12-Mar-11 8:56

csrss

12-Mar-11 8:56

Hey guys. How to convert gdiplus::color to dword value?
Like this:

Gdiplus::Color(255, 0, 0, 0) -> 0xff000000
Gdiplus::Color(160, 48, 197, 253) -> ???

Thanks

011011010110000101100011011010000110100101101110
0110010101110011

Re: Gdplus::Color to DWORD

bob1697212-Mar-11 9:37

bob16972

12-Mar-11 9:37

The simplest way is to use Color::MakeARGB or Color::GetValue

Be careful if you try storing the ARGB in a COLORREF as it is possible to lose the alpha under certain circumstances and not all of your fellow programmers would approve. Also, be aware that when dealing with the bits, you sometimes need to switch the R and B around , depending on the context.

Re: Gdplus::Color to DWORD

Luc Pattyn12-Mar-11 10:05

Luc Pattyn

12-Mar-11 10:05

assuming all input values are in the [0,255] range, all it takes IMO is

(((((arg0<<8) | arg1) <<8) | arg2) <<8) | arg3

which is best implemented as an unsigned integer expression (otherwise it could give an overflow under some circumstances).

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

Re: Gdplus::Color to DWORD

bob1697212-Mar-11 11:06

bob16972

12-Mar-11 11:06

That is basically how MakeARGB is defined (and it provides for a common code base) so I'd still recommend it when they are already using GDI+...

typedef DWORD ARGB;

enum
{
AlphaShift = 24,
RedShift = 16,
GreenShift = 8,
BlueShift = 0
};

// Assemble A, R, G, B values into a 32-bit integer

static ARGB MakeARGB(IN BYTE a,
IN BYTE r,
IN BYTE g,
IN BYTE b)
{
return (((ARGB) (b) << BlueShift) |
((ARGB) (g) << GreenShift) |
((ARGB) (r) << RedShift) |
((ARGB) (a) << AlphaShift));
}

Re: Gdplus::Color to DWORD

csrss12-Mar-11 19:46

csrss

12-Mar-11 19:46

Luc, Bob, thanks very much Smile | :)

011011010110000101100011011010000110100101101110
0110010101110011

Debug Error While Running Program on Other Computer

AmbiguousName12-Mar-11 7:20

AmbiguousName

12-Mar-11 7:20

hello guys... I wrote an application (which uses COM and ADO) inwhich I use the user 'sa' to do some small transactions, in Sql Server. Now when I run same program on some other computer, this programs shows some debug error saying

Debug Error !
This application has requested the Runtime to terminate in its unusual way. Please contact the applications support team for more information.

Now since I have run this small EXE on my laptop, so I know nothing is wrong with my program. But at the same time, sql server is also not faulty, I mean we just need to enable 'Mixed Mode' and enable the 'sa' user. Thats it. So what can be the problem.

Re: Debug Error While Running Program on Other Computer

Code-o-mat12-Mar-11 8:53

Code-o-mat

12-Mar-11 8:53

I know this ain't helpful but seeing your program run on a particular machine means only that it runs on that particular machine, it does not mean it will run on any other machine aswell. Sadly. Maybe try Post-Mortem Debugging Your Application with Minidumps and Visual Studio .NET[^]. It is hard to guess on any reasons without seeing anything of the code, circumstances, environment and so on... you could also try adding some logging to your program to find out where it crashes.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> //TODO: Implement signature here<

USB devices list [modified]

fasked12-Mar-11 3:12

fasked

12-Mar-11 3:12

How can I get the list of USB mass storage devices of kind "C:\, D:\" and etc, using C and WINAPI? I tried to do it with SetupDi* functions and got the friendly name and full path to device, but it isn't that needed.

#include <stdio.h>
#include <tchar.h>

#include <windows.h>
#include <setupapi.h>
#include <winioctl.h>

#pragma comment(lib, "setupapi")

int _tmain()
{
    DWORD i = 0;
    DWORD required_size = 0;

    PSP_INTERFACE_DEVICE_DETAIL_DATA interface_details;
    SP_INTERFACE_DEVICE_DATA interface_info;
    HDEVINFO dev_info;

    dev_info = SetupDiGetClassDevs (&GUID_DEVINTERFACE_DISK, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
    if (dev_info == INVALID_HANDLE_VALUE) 
    {
        // ERROR
        return EXIT_FAILURE;
    }

    ZeroMemory (&interface_info, sizeof (interface_info));
    interface_info.cbSize = sizeof (interface_info);

    for (i = 0; SetupDiEnumDeviceInterfaces (dev_info, NULL, &GUID_DEVINTERFACE_DISK, i, &interface_info); ++i)
    {
        SetupDiGetInterfaceDeviceDetail (dev_info, &interface_info, NULL, 0, &required_size, NULL);
        interface_details = (PSP_INTERFACE_DEVICE_DETAIL_DATA) LocalAlloc (0, required_size);
        interface_details->cbSize = sizeof (*interface_details);

        SetupDiGetInterfaceDeviceDetail (dev_info, &interface_info, interface_details, required_size, NULL, NULL);

        // 
        // interface_details->DevicePath include full path to device
        //
        
        LocalFree (interface_details);
        interface_details = NULL;
    }

    SetupDiDestroyDeviceInfoList (dev_info);
    return EXIT_SUCCESS;
}

Can you help me with this question?

Best Regards,
Alexander S.

modified on Saturday, March 12, 2011 11:20 AM

Re: USB devices list

Hans Dietrich12-Mar-11 4:53

Hans Dietrich

12-Mar-11 4:53

What problem are you having? If interface_details->DevicePath has the full path, then all you have to do is extract the drive using something like _splitpath().

Best wishes,
Hans

[Hans Dietrich Software]

Re: USB devices list

fasked12-Mar-11 5:23

fasked

12-Mar-11 5:23

interface_details->DevicePath looks like

\\?\ide#diskhitachi_hts545032b9a300_________________pb3oc64g#4&110e2cc5&0&0.0.0#
{53f56307-b6bf-11d0-94f2-00a0c91efb8b}

and there are no drive letters.

Re: USB devices list

Luc Pattyn12-Mar-11 6:05

Luc Pattyn

12-Mar-11 6:05

Hi,

I don't know the functions you are using. Here is what I have used so far:

1.
GetDriveType(string rootPathName) which is a kernel32 function. It returns one of:

/// 0 (DRIVE_UNKNOWN) The drive type cannot be determined.
/// 1 (DRIVE_NO_ROOT_DIR) The root path is invalid. (no volume is mounted at the path).
/// 2 (DRIVE_REMOVABLE) The disk can be removed from the drive.
/// 3 (DRIVE_FIXED) The disk cannot be removed from the drive.
/// 4 (DRIVE_REMOTE) The drive is a remote (network) drive.
/// 5 (DRIVE_CDROM) The drive is a CD-ROM drive.
/// 6 (DRIVE_RAMDISK) The drive is a RAM disk.

Maybe that is sufficient for your needs.

2.
If not, I would have to recommend WMI; warning: it is a bit of a puzzle. The relevant WMI classes would be Win32_DiskDrive, Win32_LogicalDiskToPartition, Win32_PhysicalMedia. And IIRC the drives come in the same order when querying Win32_PhysicalMedia and Win32_DiskDrive.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

How to create a process with a different, really restricted user account?

Member 774798412-Mar-11 1:56

Member 7747984

12-Mar-11 1:56

Let's say I have a command-line C++ program running under an Administrator account on the system and I want to start another program but I want it to run under a different user account. I want this new user account to only have write permissions to a specific subdirectory tree on the system and restricted access to the Registry (if possible). And this account should only be able to run specific programs. I also want my C++ program to manage the list of allowed programs for the target user account.

How do I create such an account? (Windows XP Professional SP3)

Then, how do I start the target program using the desired user account?

Also, using C++ (or command-line applications I can execute from my C++ program), how do I go about managing the list of allowed programs for the target user account?

Re: How to create a process with a different, really restricted user account?

Hans Dietrich12-Mar-11 4:57

Hans Dietrich

12-Mar-11 4:57