Using my application I've found a file path anywhere on my machine and store the full path in a CString variable. That is full path, like this,
G:\Work On\CPP\001_002_003.txt
What I want to do is, find the name of the file(without the extension), 001_002_003 according to my example. Then separate as 001 002 and 003, then write them to a file in three columns.
I'm stuck with how to get that three part, 001 002 and 003, from the full file path.
On my MFC application I read file and do some process on it. Here is the code I used to open and read only.
CFile srf_ReadFile;
char * srf_FilePath = "ReadFile_001.txt";
if(srf_ReadFile.Open(srf_FilePath, CFile::modeRead))
{
// Do the required process here on ReadFile_001.txt
}
So, the file should be always in the same folder which the project/solution contain. If I want to read another file, say ReadFile_002.txt, have to do it manually, go to the code and gives the new file name.
char * srf_FilePath = "ReadFile_002.txt";
It is too boring. So I want to make it more reliable to use. I want to add a browse button(I think that is the correct word, which is used to find the file in Windows) and set it as the file which I want to read.
Note that, I have put a semicolon just after the right parentheses. It’s not a syntax error, because at the compile time it not gives an error. So, it should be a logic error. I found that semicolon causes the body of the “if” statement to be empty, from a book. So, there can’t be a output like “5 == 5”, if my input are 5 and 5 on the following code.
Use system monitoring application. I recommand Everest Home Edition. Download it and run, no need to install either. It gives all the information about your system.
I want to use a dynamic buffer in one of my application. I'll explain it in this way. Depend on one of my calculation I found a number(int value), and I want to define a buffer size to that value. Then after doing all the required process need to clear that buffer size and define it to the next calculated size. Simply it is looping.
Not a reason to use CFile. Just because you have an MFC program is not a reason to use CFile either. You can mix CFile with fstreams in the same program -- I have done it hundreds of times.
Actually I haven't use it before. If I can use fstream in an MFC application what is the point to use CFile. Any special reason to do it.
Normally in such instances, first thing you have to do is check the devices individually with another working machine.
Normally most of the thermal past wont shortened any device. Reason is mainly in contains semi-conductors and avoid the current flow, not completely but up to a certain level. That small current wont damage devices.
even the fstream example you posted is not workable.
At the time I post my code it's not workable. But now it works. What I want to do is try the same application with CFile and SQL Server. And also I want to design a GUI for it later.
line 4 does not calculate the size of a file but the number of TCHARs in the file, which might or might not be the same as the size depending on the UNICODE setting.
Actually it works, I check the properties of the file(file which is used to read) and the number of bytes of the file is same as the value given by the above code.
As for CFile, the answer is NO -- and that's one reason why I hate that class. Unless the file contains serialized MFC objects you are better off using normal c++ fstreams, assuming your compiler supports it (some do not).
Most of the time I found that, people don't like MFC. Few reasons I have to use it. First thing is I want to design GUI. Second thing is I'm really new for C++ and MFC, and I'm searching the easiest way to do it.
You should stick to integers and work with them in terms of cents. So 1 = 1 cent rather than 1 dollar in your example. Calculations could also be unnoticably faster as well.
That is a good idea. Floating points normally behave like that, you have explanation on Ezzarals' last post.
Basically used in one format, either in cents or dolors.
I want to find the end of file in a CFile. What I've do up to now is, find the length of the file in bytes. Then do the required process with the number of bytes. Here is the code,
Yep, I'm sure that the DNS setup is correct. At the time I've tried the SQLOLEDB.1 connection. I think it can be easy to work on OLEDB, do you have any suggestion on that?
I create a database on SQL 2005 Express edition and link it to a C++/MFC application as follows. It wont gives any compile time errors. But at run time, it gives an error. Here are details.
I want to write some text(simply a string of characters) to the edit control on a click event. How can I do that. I know it is able to write something to the control using member function,
GetDlgItemText()
by passing two arguments, control ID and string variable. Is there a similar function which I can use.
Yep, but I want to disable it before click the Open button. That mean I want to use inside an event like form load. After all experiment I found that if I declare
I want to read a stream of bites/bytes as a String.
Here's what I have done up to now. Using a buffer I found that number of bytes, which include a text message from a binary file. Now what I want is to read those bytes stream as a String to get the message.
My issue is, use a buffer of size 5000. Some message use more than that. So I have to iteratively use the buffer cleaning after every read. But confusing, and worried about a simple way.
I have a console application, and I want to run it though a GUI. Its a simple GUI. Say there is a button called "Run", when I click the button need to execute the application do the task. Can you guys guide me to do it. I'm really new for C++ GUI developing.
Thanks,
Hi all,
I want to learn how to develop C++ GUI from the basis. So what are the resources(books, tutorials, etc). I use Microsoft Visual Studio .Net 2003.
I've try it and still checking the result with actual one.
By the time I've try to format the output in setbase() of <iomanip> for base 10(because typically it is integer value we use). But it not works. What can be issue there.
Now I want to write some values finding by using above variables, to a text file, of a function. Try it as follows.
1. void dataExtract(int length, char *buffer)
2. {
3. struct pac_cont* p = (struct pac_cont*)buffer;
4.
5. printf("dest %d member %d data %d ser %d act %d\n",p->des_list,p->mem_ID,p->dm_con,p->ser_ID,p->act) ;
6.
7. ofstream filedata ;
8. filedata.open( "RecordData.txt", ios::app ) ;
9.
10. if(filedata.is_open())
11. {
12. filedata << p->des_list << "\t" << p->mem_ID << "\t" << p->dm_con << "\t"<< p->ser_ID << "\t" << p->act << "\n";
13.
14. filedata.close() ;
15. }
16. else
17. {
18. filedata << "Wrong\n" ;
19. }
20. }
That printf gives the exact values I need on the command prompt. But the line filedata give some annoying output to the text file. I know that how format the output in printf, but no idea how to use in filedata
Someone can give a clue to me.
Thanks
If filedata is to be opened and closed in the dataExtract() function, it need not be a global, declare inside the function. As mentioned, use the appropriate file mode to set the writing action to occur at end of existing content (I'd use ios::app ).
Just go through my above post, I think it is not efficient at all.
Why are you passing the data in a char* buffer? Why not just use your struct as the data type of the parameter?
What's wrong there. Actually I've work with a binary file. Extract the streams of bytes, some of them are too short and some of them are too long. Using a buffer it is so easy, what I feel.
That appears to be only part of your program because main() looks incomplete.
Yes, it is a part of the code.
It will work if you use the correct flags. Add std::ate as the second argument to the open function. Read this for more information
Thanks for the link. Actually I've refer the same page to do this. When I used std::ate it wont work. I try to append the data using std::app. It works, but I think it is not efficient, because after writing each line close the file. Isn't it?
>>Only one time write values No idea because the code you posted does not write anything to the file in main() nor does main() ever call dataExtract().
I'm not clear you. You say that my code is nothing done. If you think that better to put full code here, I'll do it.
I want to use a function to write some values to a text file. That function is called from the main function. Every time when I can that function from main, the perviously written value is overwrite. That's true, it wont work.
So what I have done is open a file globally and use it inside the function. My question is at that time in main function the calling of it not looping. Only one time write values. What can be caused to this issue. Here is the basic view of it.
using namespace std ;
// Globale file to record exact data
ofstream filedata ;
struct pac_cont
{
unsigned int des_list ; // Destination list
unsigned int mem_ID ; // Member ID
unsigned char dm_con ; // Data/Message control
unsigned char ser_ID ; // Service ID
unsigned short act ; // Activity
};
void dataExtract(int length, char *buffer)
{
struct pac_cont* p = (struct pac_cont*)buffer;
// processing the buffer
filedata.open( "RecordData.txt" ) ;
if(filedata.is_open())
{
filedata << p->des_list << "\t" << p->mem_ID << "\t" << p->dm_con << "\t"
<< p->ser_ID << "\t" << p->act << "\n";
filedata.close() ;
}
else
{
filedata << "Wrong\n" ;
}
}
int main ()
{
while(!fileopen.eof())
{
fileopen.read(buffer, 4); // Dummy read of 4 bytes
fileopen.read(buffer, 4) ; // Read next 4 bytes
tmp_len = *(unsigned int*)buffer ; // int value of 4 bytes
if(tmp_len <= 5000)
{
fileopen.read(buffer, tmp_len) ;
filerecord << ID << "\t\t" << tmp_len …
