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ofstream f_ptr2;
string qq;
while (....)
{
f_ptr2.write(qq.c_str(),qq.length());
}
I found the above code continueously write in one big line. How to write a new line each
time when while repeat ?
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std::endl will give you a new line, write it between each line.
Christian Graus - Microsoft MVP - C++
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Why not do it like this:
f_ptr2 << qq << endl;
Using c_str and length is not needed.
Steve
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Hello, i'm in a desperate need to get a hold of the sdk for the PalmOS v3.5.
Does anyone know where i can find this, I’ve googl'd all i know about the subject and still haven’t found anything, but the sdk for it on Linux / Unix, but i need it for windows xp -> Visual c++.
If someone can please post for me a link to it I’ll be very grateful.
Thank you.
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GreenLantern wrote: windows xp -> Visual c++.
Visual C++ does not do cross-compiling.... (at least for Palm -- a competing environment) You can find the development suites for various cross-compilers and embedded development, but not for Visual C++.
http://www.palmos.com/dev/tools/c_cplusplus.html[^]
PRC-Tools is GCC based, but for windows also. Codewarrior is the standard for Palm development.
_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)
-- modified at 16:38 Wednesday 15th March, 2006
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Hi
When using GetFieldValue to get a CString value in UNICODE the CString size is twice the length of the string because the CRecordset uses SqlGetData odbc api that returns the number of bytes copied to buffer and not the number of WCHARs. So when CRecordset issue a CString::ReleaseBuffer(SqlGetDataLen); the CString becomes with twice the size of the real data. Making use of CString += results in bad strings ...
PS.: This problem exists in MFC 7.1 and 8.0
My way to resolve this is calling CString::ReleaseBuffer(-1); again after call GetFieldValue.
There is a Microsoft fix for that ?
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here I put some code to interrogate each word of the line, my intention is to print each word in the line, but I only get the first word of the line. I do not know what wroght with my code.
//
string line,word;
f_ptr1.getline(buffer_seed,58,' ');
line = string(buffer_seed);
istringstream stream (line);
while(stream >> word) {
cout << word.c_str(); }
For example, I should have pring every word of the line: "Eventyy Type : Full Waveform",
but I only print "Eventyy.
Thanks for the help
-- modified at 13:10 Wednesday 15th March, 2006
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mrby123 wrote: f_ptr1.getline(buffer_seed,58,' ');
Does buffer_seed contain the correct value?
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain
"There is no death, only a change of worlds." - Native American Proverb
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buffer_seed is char (char buffer_seed[60];)and contains the characters of the current line,
read by: f_ptr1.getline(buffer_seed,60,' ')
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mrby123 wrote:
buffer_seed is char (char buffer_seed[60]and contains the characters of the current line,
read by: f_ptr1.getline(buffer_seed,60,' ')
Are you sure? The getline() call specifies a space as the delimeter.
So have you verified that line also contains the correct value?
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain
"There is no death, only a change of worlds." - Native American Proverb
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Thanks.
My intention is to use getline to read one line. what is the delimeter should I use ?
I think this is the key. Maybe the getline only reads a word each time with curent code?
With the folowing code I read a file and write it into another file with the same format.
while (! f_ptr1.eof())
{
// f_ptr1.getline(buffer_seed,58,'"\n"');
f_ptr1.getline(buffer_seed,60,' ');
f_ptr2.write(qq.c_str(),f_ptr1.gcount());
}
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mrby123 wrote: Maybe the getline only reads a word each time with curent code?
Hence my question about buffer_seed containing the correct value? If it does not, there's no need in looking at the other code.
mrby123 wrote: With the folowing code I read a file and write it into another file with the same format.
Right, but it does so one "word" at a time. Is there a point to this exercise, or do you consider that to be a satisfactory way of copying a file?
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain
"There is no death, only a change of worlds." - Native American Proverb
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Thanks.
In fact, my purpose is to read the file line by line. The head of the file contains 33 lines of text. I like to interrogate this text to record some key information. Then the file contains three collumns of numerical data. I like to store these three columns into three different arrays.
Then the array is treated ac a time seriers and FFT will be performed and a transfer function will be multipled to the arrays.
My first task is to transfer the data to correct arrays.
This is the code (you helped) I read a file (f_ptr1)and write to another file (f_ptr2):
while (! f_ptr1.eof())
{
f_ptr1.getline(buffer_seed,58,' ');
qq = string(buffer_seed);
f_ptr2.write(qq.c_str(),f_ptr1.gcount());
}
-- modified at 14:25 Wednesday 15th March, 2006
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mrby123 wrote: f_ptr1.getline(buffer_seed,58,' ');
Why not read up to a newline character?
mrby123 wrote: qq = string(buffer_seed);
Why convert buffer_seed from a char[] to a string? Can't the write() method handle a char[] type?
mrby123 wrote: f_ptr2.write(qq.c_str(),f_ptr1.gcount());
For the second argument, why not use qq.length() instead?
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain
"There is no death, only a change of worlds." - Native American Proverb
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write() can not handle char and I tested and got messy output.
qq.length() will be equal 60 (declared space)
getline seems read a line of information, because I write out a file exact the same as input file. However, the following code can only pring the first word of the line, not every word in the line. I do not understand.
f_ptr1.getline(buffer_seed,58,' ');
qq = string(buffer_seed);
istringstream stream (qq);
while(stream >> word) {
cout << word.c_str()<
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mrby123 wrote: However, the following code can only pring the first word of the line, not every word in the line. I do not understand.
f_ptr1.getline(buffer_seed,58,' ');
Probably because only one word has been read from f_ptr1 into buffer_seed. You've instructed getline() to read up to the first space character.
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain
"There is no death, only a change of worlds." - Native American Proverb
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The problem has been fixed by:
char *tokenPtr;
f_ptr1.getline(buffer_seed,58,'\n');
qq = string(buffer_seed);
f_ptr2<
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mrby123 wrote: However, my roblem now is how to detect whether tokenPtr is a digital number or character ?
Are you referring to isdigit() and isalpha()?
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain
"There is no death, only a change of worlds." - Native American Proverb
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would you give me segments of code for these functions?
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I do not have space on my development machine, my project files are in 2000 server and VC++ 6.0 runs on the "client".
After adding new MFC class I deleted .clw file and tried to rebuild it.
I am getting an error that any of the project files cannot be accessed.
The error path looks like this “..\..\..server name\drive \.."
What’s with the "..\.." before the server name??
I can compile, debug and save the original project without any problems.
What am I missing?
Thanks for your help.
Vaclav
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What is the error number/text?
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain
"There is no death, only a change of worlds." - Native American Proverb
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Hi !
I have declare an array of characters like this :
char lStr[255];
But , i want to declare a bigger capacity of this array .
So i want to kow the maximum characters, i can declare in a array of characters ?
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It'll be governed by the size of the stack, which I think defaults to 1MB.
"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain
"There is no death, only a change of worlds." - Native American Proverb
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