C / C++ / MFC

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.

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

Richard MacCutchan2-Dec-09 1:46

Richard MacCutchan

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

Richard MacCutchan

2-Dec-09 1:49

You cannot set method parameters in this way, all this does is set the temporary parameters within GetModelInfo(). In order to return the information you will need to use some copy method into the destination arrays. Read your C reference guide on the use of pointers and parameter passing.

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

loyal ginger2-Dec-09 3:30

loyal ginger

2-Dec-09 3:30

They are not updated because inside GetModelInfo local copies of the variables (which represent the addresses of the character arrays) are assigned new values. Because they are simply copies the original contents of the variables are not changed.

To change the contents of the original arrays, you have to copy the text to the memory addresses like this:

void GetModelInfo(char *pModelName, char *pIC1, char *pIC2)
{
	memcpy(pModelName, "test", 30);
	memcpy(pIC1, "abc", 30);
	memcpy(pIC2, "abc123", 30);
}

That way they will be updated.

CListCtrl

Paulraj G1-Dec-09 21:55

Paulraj G

1-Dec-09 21:55

Hi...

Hi have two clasess. Class_A, Class_B.

Now i am having all the values in Class_B. But my listcontrol is in Class_A.

I have to set all the values from Class_B.

What is the procedure?

Thanks...

G.Paulraj

wangningyu1-Dec-09 22:02

wangningyu

1-Dec-09 22:02

I suppose that you want to access the other class's member variables , isn't it ?

you can use the new operation.

Cedric Moonen1-Dec-09 22:07

Cedric Moonen

1-Dec-09 22:07

What do you mean ? D'Oh! | :doh:

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Cedric Moonen1-Dec-09 22:07

Cedric Moonen

1-Dec-09 22:07

This really depends on how the different classes are used in your program. One approach would be to pass Class_B to Class_A and provide getters in Class_B, so that Class_A can retrieve the values and populate the list.

What kind of architecure are you using ? Are you using MFC ? If yes are you using a doc/view architecture ? Is the list part of your view ? You need to give a lot more details about your architecture in order for us to help.

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Paulraj G1-Dec-09 22:16

Paulraj G

1-Dec-09 22:16

Hi...

I am using MFC only.
Its based on ObjectARX. I am retrieving all the values in Class_B.
But my list control is class_A.

How to insert class_B values in Class_A control?

G.Paulraj