My MFC C++ application is using the following code to fetch details from INI file.
GetPrivateProfileString("MyDefaults", "MyCompanyID", " ", szBuffer, 5000,csConfIniName);
When I provide a local path (Eg: C\Temp\Myfile.ini) to csConfIniName, it can fetch the MyCompanyID value. But when I give a network path eg. \\10.1.1.500\c$\Development\Myfile.ini, GetPrivateProfileString fills szBuffer with a blank value.
Any suggestion?
Related
The following code snippet sends PostScript content (saved in pBuf buffer) to a CutePDF printer:
if (OpenPrinter(printerName, &hPrinter, NULL))
{
DOC_INFO_1 di1;
di1.pDatatype = L"RAW";
di1.pDocName = L"Raw print document";
di1.pOutputFile = NULL;
StartDocPrinter(hPrinter, 1, (LPBYTE)&di1);
StartPagePrinter(hPrinter);
DWORD dwWritten = 0;
WritePrinter(hPrinter, pBuf, dwBufSize, &dwWritten);
EndPagePrinter(hPrinter);
EndDocPrinter(hPrinter);
}
During the execution of this code, a dialog appears where I specify the name of the output file (e.g. D:/out.pdf), after that the pdf file is generated. So far so good. The problems begin when I'm trying to avoid the filename specifying step by changing Line 4 of the snippet:
di1.pOutputFile = L"D:/out.pdf";
Such code doesn't show the dialog during its execution (as expected), but the result D:/out.pdf isn't a pdf file, it's a copy of the PostScript file sent to the printer (copy of the contents of pBuf buffer). PDF Writer behaves in the same way. Why do PDF printers behave in this way and how can I achieve the needed behaviour (generate PDF file without specifying its name in UI)?
The Windows print system behaves this way, because, to be blunt, that's how its supposed to behave. If you specify a filename at that point then the print system sends the output to that file. If you don't specify a filename then it proceeds to normal processing.
Normally you would send the printer driver output to a port, and in the case of PDF printers a custom port monitor would pick up the output (PostScript in this case) and process it further. For PDF printers they send the PostScript on to a process which converts the PostScript to PDF (almost always using Ghostscript, though the Adobe print to PDF tools work the same way).
If you want to alter the output of the PDF process (ie write it to a different file), then you need to alter the way the port monitor works, not the way the print subsystem works, which is what your code is currently doing. By setting a filename where you are, you are simply short-circuiting the process, never invoking the port monitor, which is why the 'save file' dialog does not appear, and why the output is PostScript.
There may be a way of specifying the output file documented for the specific PDF printer you are using. If not, then for open source products (and if GS is built in they should be GPL licensed) you can request a copy of the source code for the product and alter it to suit yourself.
Alternatively, you can pick up a copy of Ghostscript and RedMon (open source Port Monitor) and create your own tool for doing the same job.
I am trying to get the content of a file using WinHTTP in C++. The file is a XML File and is generated by a executable on a server.
The code for init, connect and even read a file on the specified server address is working.
// Connect to internet.
m_hInternet = InternetOpen(L"HTTPRIP",INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,0);
// Check if worked.
if( !m_hInternet )
return;
// Connect to selected URL.
m_hUrl = InternetOpenUrlA(m_hInternet, strUrl.c_str(), NULL, 0, INTERNET_FLAG_PRAGMA_NOCACHE | INTERNET_FLAG_RESYNCHRONIZE, 0);
// Check if worked.
if( !m_hUrl )
return;
if( InternetReadFile(m_hUrl, buf, BUFFER_SIZE, &bytesread) && bytesread != 0 )
{
// Put into std::string.
strData = std::string(buf,buf+bytesread);
}
Now I want to update the file (same address). The server update the file at 50Hz and I want my code to be able to ReadFile only if it has been updated by the server. Can InternetReadFile do that kind of thing? Maybe with a FLAG but I didn't find a thing on MSDN.
Thanks for your help.
There is no way in the HTTP protocol for you directly do that, hence there is no such function in WinHTTP. The easiest solution might be to download the file and see if it's changed, if the file is relatively small, or if the file is large, let the server which writes the file, also write a timestamp, checksum or counter increment file next to it.
Then your code would download the checksum file, see if it's changed, and in that case download the original file.
Or another solution would be to put a timestamp or similar data in the beginning of the XML file, and stop downloading the file if the timestamp (or checksum) is not updated. (This comes with its own drawbacks of course, you may have to write your own parser.)
If HTTP server has a page with info (e.g. timestamp) on this file (no matters that a file is generated; the page may be generated too), you may examine this page.
As you know that server updates the file with (nearly) constant speed, your app may just use the timer.
P.S. I doubt if there's really a sense in reading some file 50 times every second.
I am trying to extract information from "about:plugins" website when you use Firefox web browser. I want to be able to use the contents of the website in my C++ program. Only way I know how to use content from another location is reading from a file.
What I am trying to do is read the file name and file path for each plugin from about:plugin'
Not sure if I could send this information to a file and then read it from there, but that seems like double work since if it output to file, I could just read it from there.
Needed to know how to extract information from the Firefox website in order to be used in a C++ program.
Just parse the pluginreg.dat file, you can find it in:
C:\Users\xxxxxxx\AppData\Roaming\Mozilla\Firefox\Profiles\xxxxxx.default
To obtain the AppData
char cAppData[MAX_PATH];
if(SHGetSpecialFolderPathA(NULL, cAppData, CSIDL_APPDATA, false))
{
// To obtain the profile name, parse the profiles.ini file in the folder
// ...AppData\Roaming\Mozilla\Firefox
// ...
}
Is there a way ( or an API ) to know when a text file is edited ( by a program or by a person ) and do a specific action ?
For example: I want to show a MessageBox when the file c:\Users\john\free.txt is edited.
Depends on when you exactly want to know it.
is your application running continuously and do you want to see any change as soon as possible?
is your application a simple command-line application that needs to check for changes once?
In the second case, you could check the modification dates of the file (as suggested by PoweRoy and Michal) or use a hash (as suggested by PoweRoy).
If your application is running continuously, you should use the FindFirstChangeNotification and ReadDirectoryChanges functions. You can read more about it on the following pages:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa364417(v=vs.85).aspx
http://msdn.microsoft.com/en-us/library/windows/desktop/aa365465(v=vs.85).aspx.
Simplest: compare modification dates. But this can be manipulated.
Or make a hash of the original file and compare it with the current file.
GetFileTime should help you.
http://msdn.microsoft.com/en-us/library/ms724320%28v=vs.85%29.aspx
and there is GetFileAttributesEx as well.
check the file's last modify datetime.
This method retrieves status information related to a given CFile object instance or a given file path.
BOOL GetStatus(
CFileStatus& rStatus
) const;
static BOOL PASCAL GetStatus(
LPCTSTR lpszFileName,
CFileStatus& rStatus
);
Parameters
rStatus
A reference to a user-supplied CFileStatus structure that will receive the status information. The CFileStatus structure has the following fields:
CTime m_ctime The date and time the file was created.
CTime m_mtime The date and time the file was last modified.
CTime m_atime The date and time the file was last accessed for reading.
ULONGLONG m_size The logical size of the file in bytes, as reported by the DIR command.
BYTE m_attribute The attribute byte of the file.
char m_szFullName[_MAX_PATH] The absolute filename in the Windows character set.
lpszFileName
A string in the Windows character set that is the path to the desired file. The path can be relative or absolute, or it can contain a network path name.
Return Value
TRUE if the status information for the specified file is successfully obtained; otherwise, FALSE.
PS:information from MSDN
So I was able to get the AppData folder via SHGetKnownFolderPath and converted the memory address it printed to a readable string via
SHGetKnownFolderPath(FOLDERID_RoamingAppData, NULL, NULL, &wszPath);
_bstr_t bstrPath(wszPath);
std::string strPath((char*)bstrPath);
newstring.append(strPath);
newstring.append(secondvar);
So you probably noticed the newstring.append. What I do is append the folder name I want and file to the end of the AppData location which is C:\Users\*Username*\AppData\Roaming(and append here my folder and file).
Then I use cURL to send the file from newstring to my cURL function called sendfile, however because of the hacks I tried to convert the memory address to a readable string and then append the other information, I then got a heap corrupted message.
I then tried manually putting the path to the directory and file to cURL function curl_formadd and it still wouldn't work. However, if there is a file where the application is, and use it for sending through HTTP, it works. If I add a full path, i.e C:\Users\*Username*\AppData\Roaming\myfolder\myfile.txt to the curl_formadd function, nothing happens.
So how do I go about fetching that file from the directory I want and sending it with cURL?