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Hi
I badly need a chart within an application that i am building. It should accept values from the database and draw lines but however, i was faced with a major problem, LACK OF DOCUMENTATION. Can somebody, please, help me to implement a simple bar char in visual c++ 6.0.
Thank you for your precious help.
I really need this stuff quick.
Krugger
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hi,
im looking to get access to the data in the main parent window dialog from another dialog,
i need a pointer to the main window ?
can someone give me exact code,
as i asked this before and was given instructions and
not concencrate help
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You can try with
AfxGetMainWnd()
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that returns a pointer to desktop 
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you need to pass the "main parent window" pointer to the other dialogs.
if you are creating the other dialogs from the parent dialog do something like :
{
CAnotherDialog dlg;
dlg.pParentDialog = this;
dlg.DoModal();
}
Maximilien Lincourt
Your Head A Splode - Strong Bad
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I have a data file that has info as show below.
What is the best way to retrive info only the email addresses. In VC++ 6.0, How can I read a data file by lines?
------- Data file begin -----------
From: "test1 at yahoo" <test1@yahoo.com>
Subject: Follow Up Research
To: "Someone at yahoo" <someone@yahoo.com>, "Someone at Microsoft"
<someone@ms.com>, "Someone at Lycos" <someone@lycos.com>
Cc: "Someone2 at yahoo" <someone2@yahoo.com>, "Someone2 at Microsoft"
<someone2@ms.com>, "Someone2 at Lycos" <someone2@lycos.com>
Content-Type: multipart/mixed; boundary="=_NextPart_2rfkindysadvnqw3nerasdf"
--------------- End here
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sysmatrix wrote:
In VC++ 6.0, How can I read a data file by lines?
CStdioFile::ReadString()
/ravi
My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com
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I am using ODBC 3.0 to connect to Microsoft Access Database, using ODBC functions like SQLFetch() and likes....
The data enters the database successfully but while retrieving date for no reasons Month and Year are going hayways....
the code being
HSTMT hstmt;<br />
SQLRETURN sr;<br />
SQLCHAR SQL[] = "SELECT DONumber, RelDate, Validity FROM DODetails";<br />
char mess[500];<br />
strcpy(mess,"Fetch:\n");<br />
<br />
sr = SQLAllocHandle(SQL_HANDLE_STMT, hDbConn, &hstmt);<br />
if(sr != SQL_SUCCESS && sr != SQL_SUCCESS_WITH_INFO)<br />
displayError(sr, "Error in Allocating Handle to Statement");<br />
<br />
sr = SQLExecDirect(hstmt, SQL, SQL_NTS);<br />
if(sr != SQL_SUCCESS && sr != SQL_SUCCESS_WITH_INFO)<br />
displayError(sr, "Error in Executing the Statement");<br />
<br />
<br />
sr = SQLBindCol(hstmt,1,SQL_C_TCHAR,<br />
don.donum,sizeof(don.donum),&don.dolen);<br />
if(sr != SQL_SUCCESS && sr != SQL_SUCCESS_WITH_INFO)<br />
displayError(sr, "Error in Bind 1");<br />
<br />
sr = SQLBindCol(hstmt,2,SQL_TYPE_DATE,<br />
&don.reldate,sizeof(don.reldate),&don.relen);<br />
if(sr != SQL_SUCCESS && sr != SQL_SUCCESS_WITH_INFO)<br />
displayError(sr, "Error in Bind 2");<br />
<br />
sr = SQLBindCol(hstmt,3,SQL_INTEGER,<br />
&don.valid,sizeof(don.valid),&don.valen);<br />
if(sr != SQL_SUCCESS && sr != SQL_SUCCESS_WITH_INFO)<br />
displayError(sr, "Error in Bind 3");<br />
<br />
<br />
while(SQLFetch(hstmt) == SQL_SUCCESS)<br />
{<br />
sprintf(mess,"%s\tName : %s \tRel Date : %s \t Validity : %d\n",mess,don.donum,(LPCTSTR)don.reldate.Format("%d/%m/%Y"),don.valid);<br />
<br />
}<br />
<br />
MessageBox(mess);<br />
SQLFreeHandle(SQL_HANDLE_STMT,hstmt);<br />
Also got some trouble using the CMonthCalCtrl...again the problem being the date turns out to be wrong everytime...
All help will be appreciated;)
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hello,
i am developing an addin for outlook to insert an image to outlook email body but my problem when i insert image on top of a text (using DOM) the text splits into two sides and image got placed between the text but this is not allowed i have to place image on top of the text without the splitting. Is there any way in VC++,COM,DHTML.
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I find that Graphics::DrawImage performs better when its first parameter is an instance of Image than that of Bitmap. This makes me confused:
this code fragment:
Image image(L"C:\a.jpg");
Rect rect(0,0,100,100);
g.DrawImage(&image,rect);
and this one:
Bitmap bmp(L"C:\a.jpg");
Rect rect(0,0,100,100);
g.DrawImage(&bmp,rect);
and the result is that the first one performs much better when i deflate the "rect" object.
Can any one explain this?
In my application, I read image data from an HBITMAP handle not a file,so Bitmap is preferred, but as you can see above,i need an Image object to display the image.So how can i convert a Bitmap instance to an Image instance. The type cast won't help and I have also tried Bitmap::GetThumbnailImage. And another way is to use IStream, but i am really not good at using it.
Thanks.
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ok, i need another way to test if caps lock is on or off, i tried doing
GetKeyState(VK_CAPITAL) but it doesnt work out too well. is there another method or function i can use to test if caps lock is on or off?
Compiler: VC++ 6 Enterprise
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Hello,
I have a few questions regarding Memory Management in Visual C++. I am using Visual Studio .NET 2002 and as a sidenote I am creating a Win32 application that uses the DirectX API. I am compiling in Debug mode (not Release). If I create a Class, I generally make a constructor and destructor for each class. I know the constructor is called when the user creates (instantiates) a class object. When is the destructor called?
Do I need to do something to my class object to call the destructor? Or is this automated somehow?
Also, I want to be sure I don't have any memory leaks (releasing all COM objects and freeing all pointers). How do I specifically check to see that I have successfully done so in Visual Studio .NET?
Thank You,
CBerg
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the destructor will be called when an object leaves its living scope,for example function returning. You should not try to call it directly,or the comiler may complains about that because it knows when to call the destructor. You should read some C++ textbooks to gain more about C++.
the second one: the return type of all COM interfaces is HRESULT,which is a 32bit integer. The first bit of it indicates whether an operation succeeded or failed: 0 for success and 1 for fail,so if the returing value is less than 0, you can know that the operation failed,otherwise success. Usually you can use the following macro which is defined in the Winerror.h:
#define SUCCEEDED(Status) ((HRESULT)(Status) >= 0)
#define FAILED(Status) ((HRESULT)(Status)<0)
but for the IUnknown::Release,you should always get S_OK result.
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Hi,
Just to add to what exRange said. If you allocate objects on the heap (through the keywork 'new'), then you are responsible for freeing the memory by calling delete. Generally, it is a good idea to allocate resources in the constructor and make sure they are freed in the destructor.
Keith
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Essentially, there are three ways to create an object:
class Object {
public:
Object();
~Object();
};
Object GlobalObject;
void Function()
{
Object StackObject;
Object *HeapObject = new Object;
delete HeapObject;
}First, we have a class Object, with a constructor and a destructor. There are three instances of the class in the code: GlobalObject, StackObject, and HeapObject (which is a pointer).
Since GlobalObject is at file scope, the constructor for GlobalObject is called by the C++ runtime when the program starts, and its destructor when the program exits.
StackObject is created on the stack, inside the function Function. It's destructor is called when Function() exits. More precisely, the destructor is called when execution leaves the enclosing scope (the outermost braces "{" "}" of the function).
HeapObject is a pointer to an Object allocated on the heap using the new operator. In this case, the user (you the programmer) must explicitly destroy the object using the delete operator. The delete operator calls the destructor.
COM objects are slightly different. You 'allocate' COM objects using CoCreateInstance or one of the related functions, which return an interface pointer. All COM interfaces derive from the IUnknown interface, which has three methods: AddRef, Release, and QueryInterface. When you are done using a COM object, you release it by calling the Release method through its interface pointer.
Software Zen: delete this;
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That was a beautiful answer! Thank You.
Do heap objects need to be called within functions, or can they be global as well?
When should I use a heap object rather than using a global or stackobject? As a sidenote, I am using C++ with DirectX to create different objects in my world space. I have implemented both the global object and heap objects, but I couldn't really tell a difference. Both versions of the object worked fine.
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Iceberg76 wrote:
Thank You
You're welcome.
Iceberg76 wrote:
Do heap objects need to be called within functions, or can they be global as well?
Pointers to heap objects can be global, or can be passed from routine to routine as needed. The objects themselves reside on the heap, which in a sense is a global data structure.
Iceberg76 wrote:
When should I use a heap object rather than using a global or stackobject?
Using the heap is a good idea when you don't know how many objects you'll need. One time, you may only allocate one object. The next time, maybe you'll need ten. The heap lets you adapt to that kind of situation.
Global objects have their good and bad points. They are good, in that a global object is easy to access from a lot of points in your software. Unfortunately, that's also their weak point. Since they can be accessed from everywhere, your software can get pretty tangled up. You'll find out that you can't change this feature of the object, because that part of the application depends on it. It can make maintenance and debugging a nightmare.
Stack objects are useful when you know you only need the object for the duration of a given routine.
Software Zen: delete this;
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Hey everyone,
I'm trying to learn C++ so take it easy one me, k?
I have a class called wrdrSE, and a dialog called IDD_WORDRAIDER_DIALOG. I want to use an instance of wrdrSE and call several functions within it. When the user click a button on IDD_WORDRAIDER_DIALOG, the button click events will create the instance, and call several functions within the instance. But, I am getting linking errors when I compile my project. Here are the errors:
Word RaiderDlg.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall wrdrSE::~wrdrSE(void)" (??1wrdrSE@@UAE@XZ)
Word RaiderDlg.obj : error LNK2001: unresolved external symbol "public: void __thiscall wrdrSE::Find(void)" (?Find@wrdrSE@@QAEXXZ)
Word RaiderDlg.obj : error LNK2001: unresolved external symbol "public: void __thiscall wrdrSE::CreateKeywords(class CString)" (?CreateKeywords@wrdrSE@@QAEXVCString@@@Z)
Word RaiderDlg.obj : error LNK2001: unresolved external symbol "public: __thiscall wrdrSE::wrdrSE(void)" (??0wrdrSE@@QAE@XZ)
-------------------------------
Some of the header for wrdrSE:
-------------------------------
// wrdrSE.h: interface for the wrdrSE class.
#include "wrdrSearchResults.h"
#include "wrdrSearchSettings.h"
class wrdrSE
{
public:
wrdrSE();
virtual ~wrdrSE();
public:
void CreateKeywords(CString Query);
void Find();
};
-------------------------------
here are parts of wrdrSE.cpp:
-------------------------------
// wrdrSE.cpp: implementation of the wrdrSE class.
#include "stdafx.h"
#include "Word Raider.h"
#include "wrdrSE.h"
#include "wrdrSearchResults.h"
#include "wrdrSearchSettings.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
void CreateKeywords(CString Query){
}
void Find(){
}
-------------------------------
Why am I getting these linking errors???
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you must add the classname
void wrdrSE::CreateKeywords(CString sQ) {
}
and
void wrdrSE::Find(){
}
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Try adding this to all your class function definitions in .cpp file:
void wrdrSE::CreateKeywords(CString Query){
}
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Are these statements equivalent?
char *TextString
char TextString[]
Both declarations work with my program, but I'm not sure which is correct. Basically, I want to pass a string as a parameter, but when I define the function I don't really know the size of the string.
Thank You.
CBerg
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