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Hi All,
I'm new to the Bitmap related works in the VC++. I've a buffer pointer (BYTE *p) pointing to the RGB values of a bitmap image (bottom-up). I can save the the bitmap image to 24-bits. Simultaneously I wish to save in 4-bit (16 colors) and 8-bit (256 colors) DIB bitmaps. Could you please help me how I can do it.
For 24-bit RGB image the code is :
--------------------------------
BITMAPFILEHEADER bfh;
memset( &bfh, 0, sizeof( bfh ) );
bfh.bfType = 'MB';
bfh.bfSize = sizeof( bfh ) + lBufferSize + sizeof( BITMAPINFOHEADER );
bfh.bfOffBits = sizeof( BITMAPINFOHEADER ) + sizeof( BITMAPFILEHEADER );
WriteFile( hf, &bfh, sizeof( bfh ), &dwWritten, NULL );
BITMAPINFOHEADER bih;
memset( &bih, 0, sizeof( bih ) );
bih.biSize = sizeof( bih );
bih.biWidth = lWidth;
bih.biHeight = lHeight;
bih.biPlanes = 1;
bih.biBitCount = 24;
bih.biCompression = BI_RGB;
WriteFile( hf, &bih, sizeof( bih ), &dwWritten, NULL );
WriteFile( hf, pBuffer, lBufferSize, &dwWritten, NULL );
CloseHandle( hf );
------------------
Thanks in advance.
-Ardhendu
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I've used a PostMessage cmd to window from inside a service. It works fine when a user is logged in. However, the same code does not work when no one is logged into the PC (Win 2000). Any ideas? I'm simply send ing VK_RETURN to simulate a user hitting the return key on a dialog window.
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A couple of things come to mind...
When there is no one logged in, there is no desktop, so who are you posting the message to ?
Where does this dialog window come from, if this is an app run by a user, then it won't exist when no one is logged on.
How do you know the dialog is visible when no one is logged on, so that it is able to receive the message ?
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Hi!
I'm using the great COptionTree (http://www.codeproject.com/treectrl/coptiontree.asp)
So far no problems, but then I tried to combine it with a "Sidebanner" (http://www.kinkycode.com/?section=cppdev&sub=kcsidebannerwnd)....in order to have a small image [b]on top[/b] of my dialog..
But now i have the problem, that the optiontree "moves under" the bannerimage...
Now here my question..how can i set that the y-position of the optiontree "moves" 40 pixels downwards..?
I think the OnSize function is responsable for my problem..so here the code which i have in my dialog..:
Perhaps somebody can tell me the code, i have to add 
void CPrefsDlg::OnSize(UINT nType, int cx, int cy) <br />
{<br />
if ((cx > 0) && (cy > 0))<br />
{<br />
if (::IsWindow(m_otTree.GetSafeHwnd()))<br />
{<br />
m_otTree.MoveWindow(0, 0, cx, cy);<br />
}<br />
}<br />
<br />
CPropertyPage::OnSize(nType, cx, cy); <br />
}code><br />
<br />
<br />
mfg<br />
Delphin
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I had this problem too. I solved it my keeping track of the size of the every time the frame was resized and then using this integer to calculate the new size of the other frame using subtraction.
The simpler solution is switch the order, but much less challenging.
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thanks for your reply...
as i'm not very advanced in c++, i would prefer a more easier method...
Isn't it possible to just make the optiontree "begin" 40 pixels downwards..?
isn't there a variable where i can set the (x;y) position of the tree like (0;40) ??
Perhaps you can post your code..or a short snippet which would help me a lot
thx
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Help!
this is really gettng me crazy...
Does no one know a method to move the coptiontree 40 pixels downwards from the top?
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How can I print out a image that I have in my program?
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I am trying to use source code called BOOST\TUPLE, and I get the following error.
Main.cpp
C:\IT 670\Mod 4\Example2b\boost/config.hpp(26) : fatal error C1083: Cannot open include file: 'boost/config/user.hpp': No such file or directory
Error executing cl.exe.
The files do exist and the paths are:
"C:\IT 670\Mod 4\Example2b"
"C:\IT 670\Mod 4\Example2b\BOOST"
"C:\IT 670\Mod 4\Example2b"\BOOST\TUPLE"
In my code below I use #include "boost\tuple\tuple.hpp", which the compiler is finding. But tuple.hpp uses 'boost/config/user.hpp' which the compiler does not know how to find.
I have used tools->options->directories to setup the directories so the project can find the desired files to no avail.
Any suggestion would be great. Thanks
The code is
#include <numeric>
#include <iostream.h>
#include <ostream.h>
#include <vector>
#include "boost\tuple\tuple.hpp"
//store count, sum, and sum of squares
typedef boost::tuple<std::size_t, double,="" double=""> Stats;
int main()
{
return 0;
}
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For those who care. I discovered the student version of VC 6++ does not support the path syntax of boost.
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Hi all,
I have a dialog application which on the main dialog I have associated a menu with it. I have then added appropriate Update methods to each of the menus, however when the user clicks on the menu I want the menu to then either have a tick or not depending on its previous state. Unfortunately I cant get this working, heres a code snippet:
void
MyDialog::
OnUpdateMyMenu1 ( CCmdUI* pCmdUI )
{
m_MyMenu1 = !m_MyMenu1 ;
pCmdUI->SetCheck ( m_MyMenu1 ) ;
}
the above code works on a doc/view applicationbut it doesnt on a dialog app, can anyone spot what I'm doing wrong and how to remedy it? (as an observation, I've noticed that if I set the menus default state to be checked and then click it during runtime then the check mark does go but I still cant get it to reappear)
cheers,
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cheers, I'll give that a try,
Andy,
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thank you, thats solved that problem!!
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Ok...I solved my previous questions.
This question deals with a deleteItem function that is to delete an item from an array. And I am passing a sorted array, its size, and the target element...this is what I have so far...
#include
#include
using namespace std;
template
void sortArray(T arr[], int size);
template
void searchArray(T arr[], int size, T target);
template
void deleteItem(T arr[], int &size, T target);
template
void printArray(T arr[], int size);
int main()
{
int size;
int target;
int arr[10] = {9,8,7,6,5,1,2,3,0,4};
system ("pause");
}
template
void sortArray(T arr[], int size)
{
int smallest;
T temp;
for(int i=0; i {
smallest = i;
for(int j =i+1; j {
if(arr[j] < arr[j-1])
smallest = j;
}
temp = arr[j];
arr[j] = arr[j-1];
arr[j-1] = temp;
}
}
template
void searchArray(T arr[], int size, T target)
{
int size;
int low = 0;
int high = size -1;
int mid = (low + high)/2;
int target;
bool found = flase;
do
{
if(target == arr[mid])
found = true;
else if(target < arry[mid])
high = mid-1; //looks below mid
else
low = mid +1;
if(!found)
{
mid = (low + high)/2;
}
}while (high >= low && !found)
//WHAT DO I RETURN???
}
template
void deleteItem(T arr[], int &size, T target)//only function with pass by reference
{
//PROBLEM HERE!!!!!!?????????
}
template
void printArray(T arr[], int size)
{
for(int i=0; i {
cout << arr[i] << " ";
}
}
Can anybody help me with the delete item method...I'M SO LOST!!!!!
THANK YOU FOR YOUR TIME!
Jason
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on pressing the global hotkey for some time ... I get a lot of WM_HOTKEY messages. But how to notice the release of the hotkey button?
WM_KEYUP Notification (according to msdn) is posted to window with KEYBOARD FOCUS.
but since i have a global hotkey i won't necessarily have keyboard focus.
any suggestions?
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Maybe you can have some sort of variable saying that you are processing the hotkey currently, if you are then return from that message
eg.
ON_WM_HOTKEY()
{
static bool processing = false;
if (processing)
return;
processing = true;
// do some work;
processing = false;
}
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ty but doesnt work;
since on release i dont get a WM_HOTKEY message and
after releasing i wont get in the mentioned function (ON_WM_HOTKEY)
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Hi all,
1) If I drawn a line on SDI client by using MoveTo() and LineTo(). Is there any method to detect which pixel is drawn? I need to get the coordinates of these pixels.
2) Is there any function in MFC that can calculate the distance of a drawn line (or bezier curve) from the starting point to the endpoint?
3) There is a guide in codeproject.com to redraw the drawn lines when the client window is resized/maximized/minimized. I tried and it works however, there are some codes I wrote in OnDraw to draw out the coords/axis of the client. These drawing from OnDraw is covering my META redrawn line. Please advise.
THanks a million.
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1) There's the CDC::GetPixel(), which can give you the color of a pixel knowing its coordinates, But I'm not sure it's what you want. You can still use the good old geometric equations, knowing two points you know the equation of the line, so the coordinates of all the points of the line.
2) Not at my knowledge. The length of a segment is given by the formula length = sqr((endpoint.x - startpoint.x)*(endpoint.x - startpoint.x) + (endpoint.y - startpoint.y)*(endpoint.y - startpoint.y)). Calculating the length of a bezier curve is a little trickier, you may find a good approximation here[^].
3) Make all your drawings in your OnDraw method, and begin to draw items who are "behind" at first.
Fold With Us!
War is too serious a matter to entrust to military men - Georges Clémenceau (1841-1929)
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Thanks K(arl),
The program I need to write:
1st) User is required to draw a simple curve on the client.
2nd) The algorithm will scan the SDI client screen to find all the drawn coords on row/col basis. You have suggested to use CDC::GetPixel().
3rd) Once a drawn pixel is found it will perform a 3x3 matrix check to determine the "connectivity" of this pixel. http://img52.exs.cx/img52/2303/3x3matrix.gif[^]If there are other drawn pixels in this 3x3 matrix, the drawn pixel is not an island.
4th) The program will keep scanning in loop to get to the end point of the curve. From there, the program will mark down a point for each specific distance of pixels. http://img40.exs.cx/img40/513/curve.gif[^] That is why I asked is there any function to check distance between endpoint to endpoint of a curve.
My problem:
1) Is there a better way than my algorithm? Anyone has a better idea to scan pls reply here. My method is very tedious. THanks.
2) If there is an intersection such as the two curves intersection point. The program will be bugged (I foresee).
Thanks a million
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does the code
BYTE m_byte:5 ;
set the number of bits in m_byte to 5? if so, would this line:
BYTE ret:nCodeSize = *lpBufComp;
read nCodeSize number of bits from the buffer lpBufComp? the last question is this: after having done this, how would i move the pointer lpBufComp along to the next unread bit?
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More or less, look the exact syntax up in a book like I would.
As for your second question, what I've done is something like:
struct Data {
BYTE FirstFive:5;
BYTE LastThree:3;
}
Data In;
readByte(&In);
useFiveBits(In.FirstFive);
useThreeBits(In.LastThree);
or something like that.
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i want to call/make incoming connection dialog with mfc vis.c++
i can call connection wizard using ras api, but there's no choice
for make an incoming connection.
i use incoming connection for accept a call from ras client.
i want to set incoming connection programmatically like we set ras api.
so, can anybody help me?
by the way thanks for any help for this problem........
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hi all
how can i send a voice file(playing )to another computer over network with visual c++ ?
like voice chat . but this is a voice file . i want to play it and send it to another computer
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