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No, it performs the same function as the command line command dir, and lists all files as specified by the selection mask. This is explained in detail in the MSDN documentation[^].
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That's part of the underlying file system, be it FAT32 or NTFS. See here for the latter.
"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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I have a MFC dialog application in which I have a gdiplus object that I use to draw images in real-time. Works fine if I don't want to do any changes to this object or its associated variables. But when I try to update them at runtime, it starts to increase my memory consumption.
So, my question is, how to safely update a gdiplus object at runtime.
Here is my code
LONG Width;
LONG Height;
LONG bpp;
LONG Stride;
BITMAPINFO* bmi;
BYTE* pDIBSectionBits;
HBITMAP hbm;
Graphics* imagedisp;
Bitmap* offscreenBitmap;
CWnd* Display;
CStatic m_ImageDisp;
OnInitDialog()
{
......
Width = 512;
Height = 512;
bpp = 8;
Stride = ((Width * bpp + 31L) & (~31L)) / 8L;
......
}
InitParams()
{
SetImageColor();
Display = GetDlgItem(IDH_IMAGE);
this->GetClientRect(&m_disp_rect);
Display->GetClientRect(&m_disp_rect);
m_ImageDisp.GetClientRect(&m_disp_rect);
imagedisp = new Graphics(m_ImageDisp.GetDC()->GetSafeHdc());
}
SetImageColor()
{
m_BUpdate = false;
if (bmi != NULL)
{
delete bmi;
bmi = NULL;
}
bmi = (BITMAPINFO *)new BYTE[sizeof(BITMAPINFO) + UCHAR_MAX * sizeof(RGBQUAD)];
bmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi->bmiHeader.biWidth = Width;
bmi->bmiHeader.biHeight = Height;
bmi->bmiHeader.biPlanes = 1;
bmi->bmiHeader.biBitCount = (WORD)bpp;
bmi->bmiHeader.biCompression = BI_RGB;
bmi->bmiHeader.biSizeImage = 0; bmi->bmiHeader.biXPelsPerMeter = 0;
bmi->bmiHeader.biYPelsPerMeter = 0;
bmi->bmiHeader.biClrUsed = 0;
bmi->bmiHeader.biClrImportant = 0;
memcpy(bmi->bmiColors, USECOLORMAP?summercmap:greyscale, 256*sizeof(RGBQUAD));
hbm = ::CreateDIBSection(NULL, bmi, DIB_RGB_COLORS, (void**)&pDIBSectionBits, NULL, 0);
if (offscreenBitmap != NULL)
{
delete offscreenBitmap;
offscreenBitmap = NULL;
}
offscreenBitmap = new Bitmap(bmi, pDIBSectionBits);
m_BUpdate = true;
}
OnPaint()
{
CPaintDC dc(this); if (m_BUpdate)
{
BYTE *pCurRowPixel = (BYTE *)(pDIBSectionBits);
memcpy(pCurRowPixel, ImgBuff, Width*Height);
imagedisp->DrawImage(offscreenBitmap, 0, 0, Width, Height);
}
}
So whenever the user clicks a button to change between grayscale and color pallette, SetImageColor() is called. When I monitor the memory usage while clicking that button, I see its changing the way I expect it to, but the memory usage keeps increasing at a rate of ~300KB per click.
Is there any safer way to achieve what I am trying to do without memory leaks?
thanks
PKNT
modified 26-Feb-16 14:31pm.
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do you ever call DeleteObject on the result from that CreadeDIBSection ? (you should)
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Thanks Chris, that solved my memory leak issue.
PKNT
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When I am trying run program, command line for ubuntu generation error that.
I'm trying run compline program with command /build/LSB/LSB$ ./thanhtmLSBext Girl.emb.bmp
This is code of my:
File c: thanhtmLSBext.c
include <stdio.h>
include <cv.h>
include <cxcore.h>
include <cvaux.h>
include <highgui.h>
int *alloc_int_1D(int rows);
void free_int_1D(int *array);
int main(int argc, char** argv)
{
int i, j, n = 0;
IplImage* img;
FILE *fp;
int fp_size;
int wm;
char filename = argc >= 2 ? argv[1] : (char*)"Girl.emb.jpg";
if( (img = cvLoadImage( filename, 1)) == 0 )
return -1;
fp = fopen( "extract.gray", "wb" );
if( fp == NULL )
{
puts( "extract.grayが開けません" );
return -1;
}
wm = (int *)alloc_int_1D(64*64*10);
for(i = 0; i < 64*64*10; i++){
wm[i] = 0;
}
CvScalar s;
int h=img->height;
int w=img->width;
for(i=0; i<w;> for(j=0; j<h;> s=cvGet2D(img,i,j);
wm[n] = (int)(s.val[0])%2;
fputc(wm[n]255,fp);
n++;
}
}
cvReleaseImage(&img);
free_int_1D(wm);
fclose(fp);
return 1;
}
/
IplImage* embed(IplImage *img, int wm, int N){
IplImage img1;
int i, j, n = 0;
img1 = cvCreateImage( cvGetSize(img), IPL_DEPTH_8U, 3);
CvScalar s,s1;
int h=img->height;
int w=img->width;
for(i=0; i<w;> for(j=0; j<h;> s=cvGet2D(img,i,j);
s1.val[0]=s.val[0] + (double)wm[n%N]/255 - (double)((int)(s.val[0])%2);
s1.val[1]=s.val[1];
s1.val[2]=s.val[2];
cvSet2D(img1,i,j,s1);
n++;
}
}
}
*/
int *alloc_int_1D(int rows) {
int *p;
p = (int *)malloc(rows * sizeof(int));
if (!p) {
ifdef DEBUG
fprintf(stderr, "alloc_int(): malloc() failed\n");
exit(1);
else
return NULL;
endif
}
return p;
}
void free_int_1D(int *array) {
free(array);
}
I hope everybody will help me. Thanks you.
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char filename = argc >= 2 ? argv[1] : (char)"Girl.emb.jpg";
I stopped reading the unformatted code after this point but it is very probable that this is the reason for the segmentation fault.
It should be:
const char * filename = argc >= 2 ? argv[1] : "Girl.emb.jpg";
I strongly recommend to use the -Wall GCC option when compiling and don't start the program while there are any warnings.
Then you should have a got a lot of warnings with your code; at least in the next line
if( (img = cvLoadImage( filename, 1)) == 0 )
where you are passing the char variable filename where a char * is expected.
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Hello,
Mine is a project in Visual C++, in which I am using STL, and trying to use the "find" algorithm with vectors. But it's giving me the error, error C2678: binary '==' : no operator found which takes a left-hand operand of type 'xyz' (or there is no acceptable conversion), because I have an app class in MFC which has a structure 'xyz' whose only member is a BYTE array. I am trying to get the iterator position by finding a value in a vector of a user-defined type and in return I am getting the above error. Hence a problem. Please help.
OR
someone can also suggest, which algorithm should I use to get the iterator position of the value I am searching for,from a vector of a user-defined data type (you can suggest that algorithm from the boost library also)?
Please help.
Thanks in advance. This is urgent.
Here is the relevant code snippet to understand the problem:
In the header,
typedef struct xyz
{
BYTE byHex[16];
}XYZ;
class CMyApp : public CWinApp
{
-----
------
public:
vector<XYZ> m_vec;
-------
--------
DECLARE_MESSAGE_MAP()
};
And in the implementation, in .cpp,
BYTE byBuff[16] = {0};
vector<XYZ> ::iterator viter;
viter = find(theApp.m_vec.begin(), theApp.m_vec.end(), byBuff);
And, here this "find" algorithm is giving me problems.
-- modified 26-Feb-16 7:29am.
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Implement the equal (==) operator for your xyz class and the type on the right side.
To get more help you should show us the relevant code (the operation, the structure, and the right side type). To do this edit your initial question to add this information.
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As already suggested implement the equal operator. This requires changing the typedef struct to a struct (in fact a class):
struct xyz
{
BYTE byHex[16];
bool operator==(const xyz& other)
{
return 0 == memcmp(other.byHex, this->byHex, sizeof(this->byHex));
}
bool operator==(const BYTE buf[16])
{
return 0 == memcmp(buf, this->byHex, sizeof(this->byHex));
}
};
Then use it as before:
BYTE byBuff[16] = {0};
vector<xyz> m_vec;
vector<xyz> ::iterator viter;
viter = std::find(m_vec.begin(), m_vec.end(), byBuff);
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Many thanks for this solution, I fully appreciate it. Coincidentally, I had already implemented this, but since this was taking time in checking a database which is huge in size, I was looking for some other algorithm which will give a quicker result. Could you please suggest a better algorithm which will save me from using memcmp?
-- modified 26-Feb-16 8:46am.
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Quote: Could you please suggest a better algorithm which will save me from using memcmp?
Here it is:
struct xyz
{
BYTE byHex[16];
bool operator==(const xyz& other) const { return other.byHex == this->byHex; }
bool operator==(const BYTE buf[16]) const { return buf == this->byHex; }
};
But this won't be faster because the compiler will usually generate code that calls memcmp internally (or in most cases uses an inline version of memcmp).
NOTE:
In my initial answer I forgot to make the functions const.
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Hi Jochen,
First of all, many thanks for your solution. Although it has solved my operator == overloading question, but I have one more difficulty, may be a strange experience. The find algorithm of STL is not giving the iterator position, even if the item to be searched is located in the BYTE array. Does it have anything to do with the size of the arrays as well? because one BYTE array is of 16 bytes, and the one it is to be compared with is of 33 bytes? In such a case, how can I make the find algorithm give me the correct answer? Please help.
Thanks in advance.
- Sanjay
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std::find is a function to search for an identical value of a specific type. If you have different types it won't work. This includes arrays of same type but different length.
What you are probably looking for is some kind of 'contains' (like strstr) or 'begins with' (like memcmp and strncmp with length of searching value) function which you have to implement yourself.
Example:
for (int i = 0; i < m_vec.size(); i++)
{
if (MySearch(m_vec.at(i), searchValue))
{
break;
}
}
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Visual Studio 2012, C++
I have several utilities to be put in a DLL.
If the utilities put in a DLL are built without MFC and without ATL, can they be used by those types of projects?
Can the products of multiple projects, within a single solution, be put into a single DLL? So far, my limited experience indicates this is not the case.
Can Visual Studio show the contents of a DLL? I don’t want a reverse compiler/assembler, I just want to see the signatures of the functions contained by the DLL.
My apologies for the double post. The first one disappeared and I thought I had messed up so posted again.
Thank you for your time
If you work with telemetry, please check this bulletin board: www.irigbb.com
modified 25-Feb-16 19:12pm.
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You can put any code into a DLL. It is even simpler and better when the DLL code did not use MFC or ATL (it can then be used by any application).
I'm not sure if I understand your second question. Do you mean to create a DLL with functions used by multiple applications where each application uses only a subset of exported functions?
If so, the answer is yes.
To list the symbols exported by a DLL you can use the DUMPBIN[^] command line tool (located in the VC\bin directory) with the /EXPORTS option.
You can also use the GUI tool Dependency Walker (depends.exe)[^].
Both will list the names of exported functions and variables. The Dependency Walker can also show the parameters when present in the DLL (has been build with C++ decoration).
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Already answered in the ATL forum.
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hi
i want to control parts of my code with #ifdef directive,so I need to control a #define directive before!
something like this:
if (condition)
#define active
and in other files I will check whether "active" is defined or not!
ok,I can put :
#define active
in header file then use it in others cpp files
but I cant use if statement in header!
how can i do that?
cheers,
peiman
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Please explain your problem using an example. It is (at least for me) unclear.
Common practice is to define a value somewhere (inside a header file or even passing it to the compiler via command line; optionally by project settings).
So assuming you use ACTIVE as boolean condition (defined or not defined):
#define ACTIVE
#ifdef ACTION
#endif
#ifndef ACTION
#endif
But this won't work if there is a code condition like
if (condition)
Then you have to use similar code conditions in all other places.
Note also that I have used all upper case for the defined value because this is common practice.
To know about conditional inclusions using the preprocessor see Preprocessor directives - C++ Tutorials[^].
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p3im4n wrote: but I cant use if statement in header!
Why not? A header is just a text file that gets included into, and compiled as part of, some source code. It is quite common to do something like:
#if defined(foo)
#endif
#define foo
#include <header file>
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I am doing Interprocess communication between a C console app and C++ Windows app
The C console app is the parent process
I have the Window handle (main window MainFrame) of the C++ child app I use SendNotifymessage
to tell the child app that console app has data for it in shared storage
The First time I do this all is well
The Second time around I have created a modless dialog box with a Crichedit control
it is at this time where I get a asseration from the SendNotifyMessage in the console C app
The assetration is dlgcore.cpp
at the parent GetSafeHWnd
lpDialogTemplate = (DLGTEMPLATE*)GlobalLock(hTemplate);
m_nModalResult = -1;
m_nFlags |= WF_CONTINUEMODAL;
AfxHookWindowCreate(this);
hWnd = ::CreateDialogIndirect(hInst, lpDialogTemplate,
pParentWnd->GetSafeHwnd(), AfxDlgProc);
#ifdef _DEBUG
dwError = ::GetLastError();
#endif
}
CATCH_ALL(e)
{
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pParentWnd is NULL or the window has not yet been created (it's HWND member is NULL).
I can give no more help because you did not show the relevant code parts (the posted code seems to be MFC source).
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The Hwnd is a main Window it is set to a value
i'll go into assembly mode and double check
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Why are you using pParentWnd->GetSafeHwnd() to get your HWND? You should just use GetSafeHwnd() on its own.
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thing is I don't know how the code got to dlgcore.cpp The Hwnd is a MainWindow
Okay thanks
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