C / C++ / MFC

2-Dec-09 2:40

I don't know of a DW but you might find that the LIB Command[^] will offer some information that may help.

using com

prithaa2-Dec-09 0:49

prithaa

2-Dec-09 0:49

Hello,

I have read about COM programming and now want to use it in VC++ . Which dlls or libraries will i need to use COM.I have done automation and used automation classes to open word excel . Is it very similar to that ? I am confused.

Thank you

Pritha

Richard MacCutchan2-Dec-09 1:35

2-Dec-09 1:35

prithaa wrote:
Which dlls or libraries will i need to use COM.

It depends what you are trying to do. What functions are you trying to use in your program?

Maximilien2-Dec-09 2:21

Maximilien

2-Dec-09 2:21

prithaa wrote:
I have read about COM programming and now want to use it in VC++

Why do you _need_ to use it ? Is there a particular problem that absolutly have to use COM that cannot be done otherwise ?

Office Automation classes are COM objects (AFAIRemember); so there's a link there.

This signature was proudly tested on animals.

David Crow2-Dec-09 2:56

David Crow

2-Dec-09 2:56

prithaa wrote:
I have done automation and used automation classes to open word excel . Is it very similar to that ?

Yes, that's exactly what COM is. Automation is an IPC mechanism that is based on COM.

"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

SetItemText in CListCtrl can't change the first column.

KarstenK2-Dec-09 2:57

KarstenK

2-Dec-09 2:57

But remember the best control you get with C++, so check BEFORE CODING whether all needed features are supported.

This looks like a great article for that stuff:

Accessing Excel Spreadsheets via C++[^]

Press F1 for help or google it.
Greetings from Germany

Code-o-mat1-Dec-09 23:13

Code-o-mat

1-Dec-09 23:13

Hey folks!

I have a CListCtrl which is filled with several calls to InsertItem and then later updated by using CListCtrl::SetItemText[^]. This works fine except for the first column, if i do this:

list.SetItemText(rowIndex, 0, "Hello World");

nothing happens, the method returns with nonzero indicating success, GetLastError is zero, but the text is not changed. It works for any other column, so e.g:

list.SetItemText(rowIndex, 1, "Hello World");

works fine. I would like to avoid having to insert new items and deleting old ones when there's an update just because the first column needs updating too. Any ideas why this is happening? I googled some and found similar things but nothing exactly the same or really helpfull.

Thanks for any help in advance.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Re: SetItemText in CListCtrl can't change the first column.

Adam Roderick J1-Dec-09 23:22

Re: SetItemText in CListCtrl can't change the first column.

1-Dec-09 23:22

I hope u called the InsertItem.

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Code-o-mat1-Dec-09 23:34

Code-o-mat

1-Dec-09 23:34

As said, yes. This is a stripped, simplified version what i do:

list.InsertColumn(0, "One");
list.InsertColumn(1, "Two");

list.InsertItem(0, "Hi");

list.SetItemText(0, 0, "Hello");
list.SetItemText(0, 1, "World");

After InsertItem the column "One" contains "Hi" and the column "Two" is empty.
After the first SetItemText the column "One" still contains "Hi" (this is what i don't understand) and the column "Two" is empty
After the second SetItemText column "One" contains "Hi" and column "Two" contains "World".

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Re: SetItemText in CListCtrl can't change the first column.

vasu_sri2-Dec-09 0:19

vasu_sri

2-Dec-09 0:19

if you want set the text of first item, you should call InsertItem().
and if you want set the first column, you call
SetColumn();

Regards,
Srinivas

Convert pointer to zlib stream to string?

o m n i1-Dec-09 23:03

o m n i

1-Dec-09 23:03

I have a z_streamp, which is a pointer to a z_stream_s. z_stream_s is defined as follows:

typedef struct z_stream_s {
    Bytef    *next_in;  /* next input byte */
    uInt     avail_in;  /* number of bytes available at next_in */
    uLong    total_in;  /* total nb of input bytes read so far */

    Bytef    *next_out; /* next output byte should be put there */
    uInt     avail_out; /* remaining free space at next_out */
    uLong    total_out; /* total nb of bytes output so far */

    char     *msg;      /* last error message, NULL if no error */
    struct internal_state FAR *state; /* not visible by applications */

    alloc_func zalloc;  /* used to allocate the internal state */
    free_func  zfree;   /* used to free the internal state */
    voidpf     opaque;  /* private data object passed to zalloc and zfree */

    int     data_type;  /* best guess about the data type: binary or text */
    uLong   adler;      /* adler32 value of the uncompressed data */
    uLong   reserved;   /* reserved for future use */
} z_stream;

I am trying to convery the next_in Byte to a string but I get a c2059 error that doesn't make any sense (it complains about a parenthesis: error C2059: syntax error : ')')

Here is my code:

z_stream_s zs;
zs = *z_stream_in;
  
char dest(StackSizeOf(char));
strcpy(dest,zs.next_in*);

(the *z_stream_in it uses is passed to it by the caller)

I think I may be defining the char wrong but I don't think that's whats causing the error.

Can anyone help please?

Adam Roderick J1-Dec-09 23:10

1-Dec-09 23:10

I have few doubts

1. What is the type of z_stream_in?
2. Whether StackSizeOf class is defined by you?
3. In
strcpy(dest,zs.next_in*);,
Here what zs.next_in* means?

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o m n i1-Dec-09 23:14

o m n i

1-Dec-09 23:14

1. z_streamp, which is means it is a pointer to a z_stream_s
2. StackSizeOf is defined as #define StackSizeOf(Type) ((sizeof(Type)<sizeof(PBYTE))?sizeof(PBYTE):(sizeof(Type)))
3. zs is a z_stream_s (see the definition of z_stream_s in my previous post)

Adam Roderick J2-Dec-09 0:52

2-Dec-09 0:52

strcpy takes parameter char* as first parameter and const char* as second parameter [^]

so i hope Bytef is typedef of char.
if so then explicit casting is not needed else needed
and
i think no need of zs.next_in* instead just zs.next_in is needed.

Величие не Бога может быть недооценена.

Richard MacCutchan2-Dec-09 1:46

The Value is not updated when Passing a char array by reference

2-Dec-09 1:46

Omnicoder wrote:
z_stream_s zs;
zs = *z_stream_in;

char dest(StackSizeOf(char));
strcpy(dest,zs.next_in*);

This code does not appear to make sense. I don't think you can set a z_stream_s to a reference as you are trying to do. Also strcpy() needs a pointer to an array for its source and destination fields. You have set the destination to a single character, and the source to an incomplete expresion.

manoharbalu1-Dec-09 22:53

manoharbalu

1-Dec-09 22:53

I am using VC6 win32 console application.
I have a function as follows:
void GetModelInfo(char *pModelName, char *pIC1, char *pIC2)
{

pModelName = "test";
pIC1 = "abc";
pIC2 = "abc123";

}

Code where the function is called:

{
char ModelName[30], IC1[30], IC2[30];
memset(ModelName,0,30);
memset(IC1,0,30);
memset(IC2,0,30);
GetModelInfo(ModelName, IC1, IC2);
}

After the function GetModelInfo is getting called the variables pModelName, pIC1, pIC2 are not getting updated with the values assigned inside the GetModelInfo function.

Please help me to find whats the problem

Re: The Value is not updated when Passing a char array by reference

Adam Roderick J1-Dec-09 23:13

Re: The Value is not updated when Passing a char array by reference

1-Dec-09 23:13

To get it updated either you have to use the the variables stored in heap
and allocate outside the function.
or
change the parameter as reference
void GetModelInfo(char *&pModelName, char *&pIC1, char *&pIC2)

Величие не Бога может быть недооценена.

KingsGambit1-Dec-09 23:16

KingsGambit

1-Dec-09 23:16

You can use strcpy() function instead of assignment.

strcpy(pModelName, "test");

Re: The Value is not updated when Passing a char array by reference

Richard MacCutchan2-Dec-09 1:49