C / C++ / MFC

How to get text response from a webpage?

3-Sep-04 9:45

Unfortunately, nothing like this is built in.

http://www.codeproject.com/buttonctrl/groupcheck123.asp

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

GDI+ Question

Rassul Yunussov3-Sep-04 7:37

Rassul Yunussov

3-Sep-04 7:37

I try to write programm with GDI+, put i noticed one problem - my screen is flicking even if i use the doublebuffer. What am i doing wrong??? When i used GDI and BitBlt function, everything was perfect.
I use GDI plus this way:

Graphics gr(dc.m_hdc);
Bitmap bm = new Bitmap(sizex,sizey);
Graphics gmem = Graphics::FromImage(bm);
gmem->DrawSomething();
gr.DrawImage(dc,0,0);

And another question - what about text drawn in any angle??? Is it necessery to uset rotatetransform function???

Kajal Shah3-Sep-04 7:09

Kajal Shah

3-Sep-04 7:09

There is webpage which returns a string.
https://www.helloworld.com/getkey.html?a=someparam
after supplying appropriate parameter "a" it issues a plain text response and displays page with something like this answer=abc bdg

I want to write vc++ proggy which will request this string and then get the text response. Which functions do I use to request key and collect the text data from this link? Blush | :O

keeping child dialog open

BlackDice3-Sep-04 7:03

3-Sep-04 7:03

I have a modeless dialog that i use for chatting in my application, and have an 'Always on top' checkbox for it. This works, but if I minimize the main application, both dialogs disappear. How can I also make the dialog stay visible even if the main app is minimized?

[insert witty comment here]

bdiamond Sleepy | :zzz:

PJ Arends3-Sep-04 7:06

PJ Arends

3-Sep-04 7:06

Make the dialog a child of the desktop, not your main window.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

BlackDice3-Sep-04 7:10

3-Sep-04 7:10

great answer, but how do I do that? (sorry if I sound like an idiot). I tried to use null as the argument for the CDialog superclass constructor, but that also doesn't work.

[insert witty comment here]

bdiamond Sleepy | :zzz:

David Crow3-Sep-04 7:15

3-Sep-04 7:15

How about GetDesktopWindow()?

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

BlackDice3-Sep-04 7:20

3-Sep-04 7:20

I just tried that in my dialog's constructor, but I guess I'm doing something wrong.

CChatDlg::CChatDlg(CString str,int nUserID,CWnd* pParent ) <br />
: CDialog(CChatDlg::IDD, GetDesktopWindow())

[insert witty comment here]

bdiamond Sleepy | :zzz:

David Crow3-Sep-04 7:36

3-Sep-04 7:36

It might be that you are being plagued by the fact that MFC does not have real modal dialogs. They are all modeless. It simulates a modal dialog by disabling the parent. See here and here.

Going back to your original problem, though, I'm curious why minimizing the main window causes either, let alone both, windows to disappear.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

BlackDice3-Sep-04 7:47

Any one help Memory Leak ?

3-Sep-04 7:47

Let me rephrase that. I don't mean 'disappear', I just mean they both are no longer viewable when I minimize the main app. The main app is then iconic and visible in the taskbar, but the modeless dialog is also no longer visible. I have my app set up where if the user clicks the close button, the app is minimized to the system tray. The modeless dialog then stays up. But if I click minimize, then it doesn't

[insert witty comment here]

bdiamond Sleepy | :zzz:

Amarelia3-Sep-04 7:02

Amarelia

3-Sep-04 7:02

Hi guys !
I have developed one application which continuously runs on server. But because of some memory leaks in my code it hangs out after certain time period. Can any one can help it out plz. Or any other function that can show the current memory or Total Commit memory or Memory Usage. Plz. My code is also pasted here. If you can show me some change in my code it will be worth while.
------------------------------------------------------------------
int __stdcall CompressEncode (char* sIn, char* sKey, char** sOut, long* lOutlen)
{
int iResult = 0;

if (strlen(sIn) > 400)
{
iResult = CompressData(sIn, sKey, sOut, lOutlen);
}
else
{
iResult = 1;
AES_EncodeForService(sIn, sKey, sOut, lOutlen);
if (!strstr(*sOut, "<AES_ENCODE>"))
iResult = -4;
}
return iResult;
}

int CompressData (char* sIn, char* sKey, char** sOut, long* lOutlen)
{
Byte *compr, *uncompr;
uLong comprLen = 16384*sizeof(int); /* don't overflow on MSDOS */
uLong uncomprLen = comprLen;
static const char* myVersion = ZLIB_VERSION;

if (zlibVersion()[0] != myVersion[0])
return -1;

compr = (Byte*)calloc((uInt)comprLen, 1);
uncompr = (Byte*)calloc((uInt)uncomprLen, 1);

if (compr == Z_NULL || uncompr == Z_NULL)
return -2;

uncomprLen = strlen (sIn);
int iResult = test_compress(compr, &comprLen, (Bytef*)sIn, uncomprLen);
if (iResult != 0)
return -3;

byte *buffer, key[32];
unsigned int bufLen;
unsigned int err;
ailaes demo;
char s2[33] = "";

int len = strlen(sKey);
if (len > 64)
len = 64;
for (int i = 0, j = 0; i < len; i ++, j ++)
{
char sTemp[2] = "";
sTemp[0] = sKey[i];
sTemp[1] = 0;

int c = 0;
if (!stricmp(sTemp, "0") || !stricmp(sTemp, "1") || !stricmp(sTemp, "2") || !stricmp(sTemp, "3") || !stricmp(sTemp, "4") || !stricmp(sTemp, "5") || !stricmp(sTemp, "6") || !stricmp(sTemp, "7") || !stricmp(sTemp, "8") || !stricmp(sTemp, "9"))
c = atol(sTemp) * 16;
else if (!stricmp(sTemp, "A") || !stricmp(sTemp, "a"))
c = 10 * 16;
else if (!stricmp(sTemp, "B") || !stricmp(sTemp, "b"))
c = 11 * 16;
else if (!stricmp(sTemp, "C") || !stricmp(sTemp, "c"))
c = 12 * 16;
else if (!stricmp(sTemp, "D") || !stricmp(sTemp, "d"))
c = 13 * 16;
else if (!stricmp(sTemp, "E") || !stricmp(sTemp, "e"))
c = 14 * 16;
else if (!stricmp(sTemp, "F") || !stricmp(sTemp, "f"))
c = 15 * 16;

sTemp[0] = sKey[i + 1];
sTemp[1] = 0;
i ++;
if (!stricmp(sTemp, "0") || !stricmp(sTemp, "1") || !stricmp(sTemp, "2") || !stricmp(sTemp, "3") || !stricmp(sTemp, "4") || !stricmp(sTemp, "5") || !stricmp(sTemp, "6") || !stricmp(sTemp, "7") || !stricmp(sTemp, "8") || !stricmp(sTemp, "9"))
c += atol(sTemp);
else if (!stricmp(sTemp, "A") || !stricmp(sTemp, "a"))
c += 10;
else if (!stricmp(sTemp, "B") || !stricmp(sTemp, "b"))
c += 11;
else if (!stricmp(sTemp, "C") || !stricmp(sTemp, "c"))
c += 12;
else if (!stricmp(sTemp, "D") || !stricmp(sTemp, "d"))
c += 13;
else if (!stricmp(sTemp, "E") || !stricmp(sTemp, "e"))
c += 14;
else if (!stricmp(sTemp, "F") || !stricmp(sTemp, "f"))
c += 15;

s2[j] = c;
}
s2[j] = 0;

// pad out the input string to be an even block size
err = demo.strToBlock((char*)compr, comprLen, &buffer, &bufLen);

memmove(key, s2, 32);
demo.init(CBC, key);

// encript the buffer
err = demo.encrypt(buffer, bufLen);
if (err != 0)
return -4;

// encode the crypto buffer so it can pass as a null terminated string
*sOut = ESCencode( (char*)buffer, bufLen);
*lOutlen = strlen(*sOut);

free (buffer);
free (compr);
free (uncompr);
buffer = NULL;
compr = NULL;
uncompr = NULL;
return 1;
}
int test_compress(Byte *compr, uLong *comprLen, Byte *uncompr, uLong uncomprLen)
{
int err;

err = compress(compr, comprLen, (const Bytef*)uncompr, uncomprLen);
// CHECK_ERR(err, "compress");

return err;
}

int ZEXPORT compress (dest, destLen, source, sourceLen)
Bytef *dest;
uLongf *destLen;
const Bytef *source;
uLong sourceLen;
{
return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
}

int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
Bytef *dest;
uLongf *destLen;
const Bytef *source;
uLong sourceLen;
int level;
{
z_stream stream;
int err;
stream.next_in = (Bytef*)source;
stream.avail_in = (uInt)sourceLen;
#ifdef MAXSEG_64K
/* Check for source > 64K on 16-bit machine: */
if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
#endif
stream.next_out = dest;
stream.avail_out = (uInt)*destLen;
if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;

stream.zalloc = (alloc_func)0;
stream.zfree = (free_func)0;
stream.opaque = (voidpf)0;

err = deflateInit(&stream, level);
if (err != Z_OK) return err;

err = deflate(&stream, Z_FINISH);
if (err != Z_STREAM_END) {
deflateEnd(&stream);

return err == Z_OK ? Z_BUF_ERROR : err;
}
*destLen = stream.total_out;

err = deflateEnd(&stream);
return err;
}

Re: Any one help Memory Leak ?

David Crow3-Sep-04 7:10

Re: Any one help Memory Leak ?

3-Sep-04 7:10

For every call to calloc(), regardless of the execution path, there needs to be a corresponding call to free(). You do not have that here. For example:

compr = (Byte*)calloc((uInt)comprLen, 1);
uncompr = (Byte*)calloc((uInt)uncomprLen, 1);
 
if (compr == Z_NULL || uncompr == Z_NULL)
    return -2;
 
// what if compr is NULL but uncompr is not?  you are returning without
// freeing uncomrp
 
uncomprLen = strlen (sIn);
int iResult = test_compress(compr, &comprLen, (Bytef*)sIn, uncomprLen);
if (iResult != 0)
    return -3;
 
// at this point, compr and uncompr are non-NULL but have been freed.

Until you can get these type of problems addressed, the symptoms you describe are not surprising.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Rick York3-Sep-04 13:09

Rick York

3-Sep-04 13:09

Why are you doing so many string compares on strings of one byte ? A simple character comparison would be quite a bit faster.

Also - stricmp is a case-insensitive string compare so there is no need to evaluate with both the upper and lower case versions of strings.

Your code could be optimized considerably.

__________________________________________
a two cent stamp short of going postal.

Database work in Visual C++

Iftikhar Baig3-Sep-04 6:36

Iftikhar Baig

3-Sep-04 6:36

Friends,
I am doing some database work using Visual C++. For the first time i am using 'DataGrid Control'. Problem is that, i am unable to "edit" datagrid text if the query i execuated consists of "joins". Can anyone tell me that how can i overcome this problem. Can you tell me whether "Hierarichal Flex grid is the solution ??

Re: Database work in Visual C++

David Crow3-Sep-04 7:01

Re: Database work in Visual C++

3-Sep-04 7:01

Last time I checked, JOINs weren't editable.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Imtiaz Baig3-Sep-04 7:08

Imtiaz Baig

3-Sep-04 7:08

Friend,
I am doing database work for first time in VC++. There is lots of hardwork involved as compared to Visual Basic. But i feel that i am not following right path. Are "data controls" i am using are good solution, or there is some better solution. Can i insert combo box in the cells of datagrid control or other such controls. If not then how can i make my life easy for doing database programming in Visual C++. Please suggest me the right way to follow ??

Re: Database work in Visual C++

David Crow3-Sep-04 7:14