C / C++ / MFC

22-Feb-09 20:16

hi everyone

I want load a jpg and a png,then add png to jpg，at last it will output a jpg.
what can i do?

Thanks in advanced

Chandrasekharan P22-Feb-09 20:39

Chandrasekharan P

22-Feb-09 20:39

wenbingao22-Feb-09 20:46

22-Feb-09 20:46

it means a png insert to a jpg, 2 images will output 1 image

Stuart Dootson22-Feb-09 21:37

Stuart Dootson

22-Feb-09 21:37

wenbingao wrote:
add png to jpg

For what definition of 'add'?

Splitting the task into components:

Load jpg or png - CImage[^] will do that
Adding the two images? As I said, depends what you mean by add
Save the resulting bitmap as a jpg - again, CImage will do that

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

wenbingao22-Feb-09 22:14

22-Feb-09 22:14

the image I want is made up of a jpg and a png,so "add" means two images become one,jpg is background img,png is the foreground.

what can I do for synthesis two image?

Stuart Dootson22-Feb-09 22:17

Stuart Dootson

22-Feb-09 22:17

You probably want to AlphaBlend[^] the png onto the jpg. You'll need to work out how transparency is indicated in the png file.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

wenbingao22-Feb-09 22:25

22-Feb-09 22:25

thank you for your reply.I'll research it
thanks again Smile | :)

Linker error message....

vanishaa22-Feb-09 20:13

vanishaa

22-Feb-09 20:13

what's d meaning of these following error messages..
how do i overcome these error??

1>------ Build started: Project: SQLite, Configuration: Debug Win32 ------
1>Compiling...
1>SQLite.cpp
1>Linking...
1>SQLite.obj : error LNK2019: unresolved external symbol _sqlite3_free referenced in function _main
1>SQLite.obj : error LNK2019: unresolved external symbol _sqlite3_exec referenced in function _main
1>SQLite.obj : error LNK2019: unresolved external symbol _sqlite3_close referenced in function _main
1>SQLite.obj : error LNK2019: unresolved external symbol _sqlite3_errmsg referenced in function _main
1>SQLite.obj : error LNK2019: unresolved external symbol _sqlite3_open referenced in function _main
1>C:\Users\Vani\Documents\Visual Studio 2005\Projects\SQLite\Debug\SQLite.exe : fatal error LNK1120: 5 unresolved externals
1>Build log was saved at "file://c:\Users\Vani\Documents\Visual Studio 2005\Projects\SQLite\SQLite\Debug\BuildLog.htm"
1>SQLite - 6 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Cedric Moonen22-Feb-09 20:27

Cedric Moonen

22-Feb-09 20:27

You probably forgot to link to the correct library (the sqllite library). Have you done that in your project settings ?

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

vanishaa23-Feb-09 1:00

vanishaa

23-Feb-09 1:00

hi.. i've already added the required sqlite3.h header file yet the error messages are not resolved. Can you please help me on that. This is my coding:

// SQLITE1.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <stdio.h>
#include "sqlite3.h"

static int callback(void *NotUsed, int argc, char **argv, char **azColName){
int i;
for(i=0; i<argc; i++){
printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
}
printf("\n");
return 0;
}

int main(int argc, char **argv){
sqlite3 *db;
char *zErrMsg = 0;
int rc;

if( argc!=3 ){
fprintf(stderr, "Usage: %s DATABASE SQL-STATEMENT\n", argv[0]);

}
rc = sqlite3_open(argv[1], &db);
if( rc ){
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);

}
rc = sqlite3_exec(db, argv[2], callback, 0, &zErrMsg);
if( rc!=SQLITE_OK ){
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
}
sqlite3_close(db);
return 0;
}

Cedric Moonen23-Feb-09 1:05

Cedric Moonen

23-Feb-09 1:05

vanishaa wrote:
hi.. i've already added the required sqlite3.h header file yet the error messages are not resolved.

A .h file is not a library file, it's a header file. You need to have a *.lib file to be added in your project settings: in the linker category, you need to add the name of the lib file in "Additional Dependencies" or something like that (I don't have VS installed on my PC here so I can't give you the exact location, but search a bit and you'll find it).

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

vanishaa23-Feb-09 2:22

vanishaa

23-Feb-09 2:22

I'm using visual c++ for the project and already added the sqlite3.dll file. The same error occurs again. I have no idea where it went wrong..

Cedric Moonen23-Feb-09 2:53

Cedric Moonen

23-Feb-09 2:53

I'm talking about a .LIB file, not a dll file. Did you add this lib file in your project settings (3rd time I'm asking) ?

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Julian date

Vijjuuu.22-Feb-09 19:44

22-Feb-09 19:44

Hi all ,

is there any function that converts this string str = "23/02/09 14:44:13" to julian date format in C or C++ .

thanks in advance .

CPallini22-Feb-09 21:27

CPallini

22-Feb-09 21:27

Vijjuuuuuuuuu........... wrote:
is there any function that converts this string str = "23/02/09 14:44:13" to julian date format in C or C++ .

Yes (and it possibly returns 09034 for your input).
Roll eyes | :rolleyes:

Vijjuuu.22-Feb-09 21:47

Re: Julian date [modified]

22-Feb-09 21:47

Thanks for the reply , but is there any function to do that ?

CPallini22-Feb-09 21:55

CPallini

22-Feb-09 21:55

You can roll your own one. What are your doubts while doing that?

I recall for you the needed steps (if you aren't using MFC or ATL). You have to:

Parse the string to obtain day-of-month, month and year from the string.
Convert day-of-month and month to day-of-year.
Align properly year and day-of-year values in the resulting number.

In the above task, only point(2) is a bit tricky because of leap years.

Using MFC or ATL would make your life easier.

modified on Monday, February 23, 2009 4:11 AM

ky_rerun23-Feb-09 9:46

ky_rerun

23-Feb-09 9:46

just use scansf grab the constituent parts and throw it into a SYSTEMTIME struct.

Just rember that scanf assumes int * and the systemtime struct is all word size objects.

a programmer traped in a thugs body

ky_rerun23-Feb-09 9:50

ky_rerun

23-Feb-09 9:50

DWORD Month,Day,Year,Hour,Minute,Second;

//Initalize the values and the structure to zero
Month = Day = Year = Hour = Minute = Second = 0;
memset(&ST,0,sizeof(ST));
//Fix This use the stram reader so I can read the write size
//Parse out the date with sscanf
sscanf_s(Val.c_str(),"%d/%d/%d %d:%d:%d ",&Day,&Month,&Year,&Hour,&Minute,
&Second);

//reassign the values into the structure
ST.wDay = (WORD) Day ;
ST.wMonth = (WORD) Month ;
ST.wYear = (WORD) Year ;
ST.wHour = (WORD) Hour ;
ST.wSecond = (WORD) Second;
ST.wMinute = (WORD) Minute;

a programmer traped in a thugs body

Garth J Lancaster22-Feb-09 22:28

Garth J Lancaster

22-Feb-09 22:28

it depends on what you mean by julian date - since the term is most often miss-used these days.

If you mean 'the day number as a number starting counting from the 1st of Jan in the Current year', then you need to follow the advice of our trusted and esteemed colleague CPallini

If you mean since an arbitrary point in time - such as is used by astronomers etc, ie 4713BC, then, part one of CPallini's response still applies, then you feed the results of the parse into something like :-

http://www.silverglass.org/code/Date.html[^]

'g'

Vijjuuu.24-Feb-09 20:21

24-Feb-09 20:21

Thanks for replying me Smile | :)

Stephen Hewitt23-Feb-09 2:29

Stephen Hewitt

23-Feb-09 2:29

One possible solution is to use Boost[^]'s Date_Time[^] library.

Steve

Vijjuuu.24-Feb-09 20:23