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Heartless
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HomerSexual
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 Posted: Tue Jan 22, 2008 4:48 pm Post subject: |
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| Wiccaan wrote: | | blankrider wrote: | LPTSTR cOutputFolder = NULL;
if(GetCurrentDirectory(sizeof(cOutputFolder), cOutputFolder) = 0)
//error
else{
//the cOutputFolder has the string of the folder
} |
Couple of errors with your code, you are trying to set GetCurrentDirectory to 0 instead of comparing it. You forgot the first set of braces { } for the if statement as well. Along with that you are using sizeof() on an undefined size array. The sizeof() in this case will return 4 because LPTSTR is a pointer to a string. Instead, you should write it like:
| Code: | TCHAR tszCurrentDirectory[MAX_PATH] = {0};
if( GetCurrentDirectory( sizeof(tszCurrentDirectory), tszCurrentDirectory ) == 0 ){
// Success
}else{
// Error
} |
|
Just thought i'd point out that 0 is the error value. so switch success and error
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Heartless
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| Posted: Tue Jan 22, 2008 5:23 pm Post subject: |
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Nevermind I found it.
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atom0s
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| Posted: Tue Jan 22, 2008 8:16 pm Post subject: |
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Actually, I wrote the cases wrong, if the return is 0 from GetCurrentDirectory, that means it failed. So the first part of the if should be the fail code, 2nd being the success. As for the fail, no reason to switch the error, just use GetLastError() to obtain the number and then FormatMessage it for the detailed info. (Reason why I suggested { } around the error to allow more then one line. I do know you can do a single line without the bracets.)
I rewrote my code with a small bit of error handling in its own function:
| Code: | BOOL CurrentDirectory( TCHAR* tszBuffer )
{
TCHAR tszCurrentDirectory[MAX_PATH] = {0};
if( GetCurrentDirectory( _ARRAYSIZE(tszCurrentDirectory), tszCurrentDirectory ) == 0 )
{
//
// Error Occured, Obtain And Display
//
LPVOID lpMsgBuf;
DWORD dwLastError = GetLastError();
FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwLastError,
MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT),
(LPTSTR)&lpMsgBuf,
0,
NULL );
MessageBox( NULL, (LPTSTR)lpMsgBuf, TEXT("ERROR -- CurrentDirectory"), MB_OK|MB_ICONERROR );
return FALSE;
}
//
// No Error Occured, Copy Path Into Buffer
//
_tcscpy_s( tszBuffer, MAX_PATH, tszCurrentDirectory );
return TRUE;
} |
Example of using it:
| Code: | #include <windows.h>
#include <tchar.h>
#include <iostream>
using namespace std;
BOOL CurrentDirectory( TCHAR* tszBuffer )
{
TCHAR tszCurrentDirectory[MAX_PATH] = {0};
if( GetCurrentDirectory( _ARRAYSIZE(tszCurrentDirectory), tszCurrentDirectory ) == 0 )
{
//
// Error Occured, Obtain And Display
//
LPVOID lpMsgBuf;
DWORD dwLastError = GetLastError();
FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwLastError,
MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT),
(LPTSTR)&lpMsgBuf,
0,
NULL );
MessageBox( NULL, (LPTSTR)lpMsgBuf, TEXT("ERROR -- CurrentDirectory"), MB_OK|MB_ICONERROR );
return FALSE;
}
//
// No Error Occured, Copy Path Into Buffer
//
_tcscpy_s( tszBuffer, MAX_PATH, tszCurrentDirectory );
return TRUE;
}
int main()
{
TCHAR tszPath[MAX_PATH] = {0};
if( CurrentDirectory( tszPath ) )
std::cout << tszPath << std::endl;
std::cin.ignore();
std::cin.sync();
return 0;
} |
The _tcscpy_s will fail if the buffer is not 255 characters or more, I didn't bother adding a try/catch or other error handling methods to it though. Just be sure to define your array sizes correctly via MAX_PATH for paths.
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Heartless
I post too much
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| Posted: Tue Jan 22, 2008 9:55 pm Post subject: |
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Some thing is not right, all I get are random numbers and 00000000.
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atom0s
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| Posted: Tue Jan 22, 2008 10:47 pm Post subject: |
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| HornyAZNBoy wrote: | | Some thing is not right, all I get are random numbers and 00000000. |
Ok a few questions then:
- What OS are you using? (Service packs too.)
- What compiler are you using?
The code I posted above returns the following for me:
c:\Documents and Settings\Owner\Desktop\[ C++ ]\New Folder\asdf\asdf
Which is the path to the solution which the file is being ran from. For you to get random numbers, it makes it seem like you are using the wrong part of the return and not the string. GetCurrentDirectory returns the number of characters in the string thats being returned. So do not use the return value from it.
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NINTENDO
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| Posted: Wed Jan 23, 2008 2:25 am Post subject: |
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This might be offtopic but how do you do the same in vb?
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atom0s
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| Posted: Wed Jan 23, 2008 2:53 am Post subject: |
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| Naablet wrote: | | This might be offtopic but how do you do the same in vb? |
Well if you want the current folder your application is in, you can just use:
But if you want a function like above that uses the API you can do:
| Code: | Option Explicit
Private Const FORMAT_MESSAGE_ALLOCATE_BUFFER = &H100
Private Const FORMAT_MESSAGE_FROM_SYSTEM = &H1000
Private Const LANG_NEUTRAL = &H0
Private Const SUBLANG_DEFAULT = &H1
Private Declare Function FormatMessage Lib "kernel32" Alias "FormatMessageA" (ByVal dwFlags As Long, lpSource As Any, ByVal dwMessageId As Long, ByVal dwLanguageId As Long, ByVal lpBuffer As String, ByVal nSize As Long, Arguments As Long) As Long
Private Declare Function GetCurrentDirectory Lib "kernel32" Alias "GetCurrentDirectoryA" (ByVal nBufferLength As Long, ByVal lpBuffer As String) As Long
Private Declare Function GetLastError Lib "kernel32" () As Long
Public Function CurrentDirectory() As String
Dim strTempPath As String
strTempPath = String$(255, Chr$(0))
If GetCurrentDirectory(255, strTempPath) = 0 Then
Dim strErrorBuffer As String
strErrorBuffer = Space(255)
FormatMessage FORMAT_MESSAGE_FROM_SYSTEM, ByVal 0&, GetLastError, LANG_NEUTRAL, strErrorBuffer, 255, ByVal 0&
MsgBox strErrorBuffer, vbCritical, "ERROR - CurrentDirectory"
Exit Function
End If
CurrentDirectory = strTempPath
End Function |
Then to use it, you can do:
| Code: | Private Sub Form_Load()
Text1.Text = CurrentDirectory
End Sub |
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NINTENDO
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Pseudo Xero
I post too much
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| Posted: Wed Jan 23, 2008 5:42 am Post subject: |
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| Naablet wrote: | I meant how to read variable values from a ini file, in vb  |
Google is your friend.
_________________
| haxory' wrote: | can't VB do anything??
windows is programmed using VB right? correct me if im wrong.
so all things in windows you have like the start menu is a windows form too. |
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NINTENDO
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atom0s
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