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Most likely person to help you is the one who wrote the article and the code. Please post your question in the forum at the end of the article.
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Hello Folks,
Am new to MFC, actually am trying to use PageUp/PageDown keys to switch top/Bottom of the tree, but the problem is when trying am to click keys by default it selects an item & switches over from top-to-bottom/bottom-to-top. And I've also tried the solution
TreeItem = GetSelectedItem();
if (TreeItem)
{
SetItemState(TreeItem, 0, TVIS_SELECTED);
}
but it works when any one of the keys for the second time. so i request for a solution where i can directly switch over from top/button without any item being selected/focused
Thank You,
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Hello,
in a MFC program I've put a picture control (bitmap type) that display a bitmap image inserted into the resources.
I want to draw rectangles on the bitmap so I've put the OnDraw method like this for example:
void CDialog3::OnPaint()
{
CPaintDC dc(this); dc.Rectangle(0,0,300,300);
}
it's very simple and the rectangle has been drawn but it's overlapped by the bitmap when it is drawn in the region where the bitmap is located.
For every rectangle I draw there is the bitmap in front of it.
How can I put the bitmap rear my rectangles and rear any shape that I want to draw?
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You need to understand how controls draw themselves in response to WM_PAINT messages. You probably need to draw the bitmap in the OnPaint method first, and then draw the rectangle over it.
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Dear Richard,
many thanks for your help.
I followed your suggestion and it works.
In my previous code I put the IDB_BITMAP of the bitmap into the IMAGE property of the Picture Control in order to load the bitmap automatically. I hadn't used a control variable to load the bitmap.
Now I have add a control variable and I load the bitmap before drawing the rectangle. In this way the bitmap is under my rectangles.
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I understand that using Hungarian notation is nowadays pretty superfluous , however...
Should I name class variable "cClass" as a class or "oClass" as an object.
Just asking, do not flame me for splitting hair.
Cheers Vaclav
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Vaclav_Sal wrote: Should I name class variable "cClass" as a class or "oClass" as an object.
It's completely up to you. What notation helps you to remember what it is?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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(hmmmm religious topic, my favorite)
We do not use prefix or suffix (or hungarian notation) for our variable.
class MyClass {};
MyClass myClass;
MyClass* myOtherClass;
I'd rather be phishing!
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The IMPORTANT thing, mY Dear, is_choosing A conVention and USING it ConSiStenTly.
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In Windows, you'll see "CClass" a lot (capital C as a prefix)... in Linux and a lot of standard libraries, you won't see any indication at all, for them enclosing things properly within namespaces is more important.
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If you intend to follow the object-oriented paradigm, then prefixing a variable name with 'o' for 'object' makes about as much sense as prefixing it with 'v' for 'variable'. You might still consider this sensible, to visibly discern them from type names, constants, and functions though. YMMV.
As for 'c' (class) prefix, it's often used to distinguish type names from e. g. structs, integral types, enums, etc.. I used (and still use) this a lot, but the longer I think about it the less sense it appears to make: modern editors provide all the information you need by just hovering over the name in question, much more information in fact than you could ever sensibly pack into a prefix. The prefix therefore only carries valuable information if you tend to print out code and prefer analyzing code on paper. Again, not my preference, but YMMV.
GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)
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Ok, prefixes for generic objects (like 'o' for objects, or 'v' for variables) are bad notations, but prefixes for variables type make the code more readable, like a story e.g. 'str' for strings, 'n' for numbers, 'arr' for arrays, and so on ... and they are not so hard to type ...
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You're referring to the incorrect use of hungarian notation. Let me point you to this great article about why it is wrong and how to use it correctly: http://www.joelonsoftware.com/articles/Wrong.html[^]
GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)
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Interesting article ... so, the time has changed ?...
modified 2-Jul-15 7:39am.
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I don't use Hungarian these days but oClass seems to have been the more common style (especially in VB). In C++ it was also common not to use Hungarian with objects but just with simple types, integers, floats, etc.
In the .NET world Hungarian is discouraged but there is still a widely-used concession to Hungarian with the names of UI controls. btnCustomer, etc., although really we should prefer customerButton.
Kevin
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Hello as subject says i am trying to make some simple binary file compressor (for now). I started with basics.
This code opens file in binary mode reads byte by byte and input bytes writes to output "compressed" file. If byte == 0x00 counts number of 0x00's and writes 0x00 and number of 0x00's.
#include<stdio.h>
#include<stdlib.h>
int main()
{
int i, duzina, stanje=0, brojac=0;
unsigned char chr;
FILE* ulaz = fopen("../testapp/testapp", "rb");
FILE* izlaz = fopen("../testapp/testapp.zip", "wb");
if(ulaz == NULL)
{
printf("Problem with file!\n");
exit(1);
}
if(izlaz == NULL)
{
printf("Problem with output file!\n");
exit(1);
}
fseek(ulaz, 0, SEEK_END);
duzina = ftell(ulaz);
fseek(ulaz, 0, SEEK_SET);
for(i=0; i<duzina; i++)
{
chr = fgetc(ulaz);
if(chr == 0x00)
{
if(stanje == 0)
{
stanje=1;
brojac=1;
}
else
brojac++;
}
else
{
if(stanje == 0)
fputc(chr, izlaz);
else
{
fputc(0x00, izlaz);
fwrite(&brojac, sizeof(int),1,izlaz);
fputc(chr, izlaz);
printf("%d ", brojac);
stanje=0;
brojac=0;
}
}
}
fclose(izlaz);
fclose(ulaz);
}
To "decompress" file i use this code which as input have "compressed" file and read byte by byte if byte == 0x00 reads integer and write N times 0x00 (N value = readed integer)
#include<stdio.h>
#include<stdlib.h>
int main()
{
int i,j, duzina, brojac=0;
unsigned char chr;
FILE* ulaz = fopen("../testapp/testapp.zip", "rb");
FILE* izlaz = fopen("../testapp/testapp1", "wb");
if(ulaz == NULL)
{
printf("Problem with file!\n");
exit(1);
}
if(izlaz == NULL)
{
printf("Problem with output file!\n");
exit(1);
}
fseek(ulaz, 0, SEEK_END);
duzina = ftell(ulaz);
fseek(ulaz, 0, SEEK_SET);
for(i=0; i<duzina; i++)
{
chr = fgetc(ulaz);
if(chr == 0x00)
{
fread(&brojac, sizeof(int), 1, ulaz);
printf("%d ", brojac);
for(j=0; j<brojac; j++)
fputc(0x00, izlaz);
i+=4;
}
else
fputc(chr, izlaz);
}
fclose(izlaz);
fclose(ulaz);
}
So my problem is that when "decompressing" is finshed some bytes are missing (program works correct).
Byte comparing:
[stone@hero testapp]$ diff testapp1.hex testapp.hex
443,444c443,444
< 0001c00 0001
< 0001c01
---
> 0001c00 0001 0000 0000 0000 0000 0000 0000 0000
> 0001c10
[stone@hero testapp]$
I'm on: Linux hero 3.18.15-1-MANJARO #1 SMP PREEMPT Sun Jun 14 10:09:07 UTC 2015 x86_64 GNU/Linux if it matters.
Source code for test app:
#include<stdio.h>
#include<time.h>
main()
{
srand(time(NULL));
printf("\nHello, stone... ");
printf("Your random number is: %d\n\n", rand() % 100 + 1);
}
What can be a problem with missing bytes?
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The compressor has a problem with a possibly pending 0-sequence at the end of the file, because your program outputs the 0-sequences only on changes, that is when meets a non-zero character.
You have to check for a pending 0-sequence immediately after execution of the for loop:
if(stanje != 0)
{
fputc(0x00, izlaz);
fwrite(&brojac, sizeof(int),1,izlaz);
}
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Is anyone aware of a library to create a standalone executable with a Visual Studio 2013 native unit test DLL?
(I need to do some dynamic analysis on part of my code, but the tool needs to instrument the loading executable. I can't use my main executable since it runs on an embedded system with very specific and locked down hardware.)
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Aren't the libs included for the unit test library?
If so, you should be able to just build your test code into a stand alone, statically-linked executable.
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Tried that, but the result doesn't do anything. The VC++ Native Unit Tests have a test runner and that's the secret sauce, so to speak. (It enumerates all the exports from the test dll and runs them. I could figure this out, but was hoping someone else already has.)
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Hi
Can the "CStatic" CWnd object be used (in the create of course) with the CTEXT resource definition statement
Thanks
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Thanks with the SS_NOTIFY
I can process the ::onCtlColor use the CWnd::GetDlgitem (for proper control) and
SetbkColor
SetTextColor
and SetWindowText of the controls before the Dialog which is the parent to the control is displayed.
Thanks
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I have been using Windows Event Log in order to catch events with a C++ Project on VS2008 for a couple of years.
However, recently(means a couple of days), i cannot catch them on Windows 8.1. I have no problem with Windows 7 or Vista.
Subscribe function "EvtSubscribeFn" returns success but callback does not work.
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