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`unknown
Grandmaster Cheater
 Reputation: 0
Joined: 20 Nov 2006
Posts: 658
Location: You lost the game.
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 Posted: Sun May 03, 2009 6:51 pm Post subject: [C++] Copying a file into memory |
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I'm trying to read a file, and copy it into memory that I allocated with VirtualAlloc, but every time I call the ReadFile API my program just crashes. After adding a SEH, the call to GetLastError() told me that I had a "Invalid Window Handle," although I don't think that is related to ReadFile. Code is as follows:
| Code: | BOOL bRead;
HANDLE hCEMFile;
LPVOID lpvCRCBase;
LPDWORD lpBytesRead = 0;
hCEMFile = CreateFile(
"kMS.CEM",
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL
);
if( hCEMFile == INVALID_HANDLE_VALUE )
{
MessageBox( NULL, "Error opening CEM File! CRC Bypass not enabled!", "Warning!", MB_ICONWARNING | MB_OK );
return;
}
lpvCRCBase = VirtualAlloc( NULL, 6291456, MEM_COMMIT, PAGE_EXECUTE_READWRITE );
if( lpvCRCBase == NULL )
{
MessageBox( NULL, "Error allocating memory! CRC Bypass not enabled!", "Warning!", MB_ICONWARNING | MB_OK );
return;
}
bRead = ReadFile( hCEMFile, lpvCRCBase, 6291456, lpBytesRead, NULL ); // crash here
if( !bRead || lpBytesRead != (LPDWORD)6291456 )
{
MessageBox( NULL, "Error reading CEM File! CRC Bypass not enabled!", "Warning!", MB_ICONWARNING | MB_OK );
return;
}
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lurc
Grandmaster Cheater Supreme
 Reputation: 2
Joined: 13 Nov 2006
Posts: 1900
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| Posted: Sun May 03, 2009 7:03 pm Post subject: |
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The pointer is not initialized.
Change:
| Code: | | LPDWORD lpBytesRead = 0; |
To either:
| Code: | | LPDWORD lpBytesRead = new DWORD; |
or
| Code: | DWORD lpBytesRead;
...
ReadFile(hCEMFile, lpvCRCBase, 6291456, &lpBytesRead, NULL); |
_________________
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`unknown
Grandmaster Cheater
Reputation: 0
Joined: 20 Nov 2006
Posts: 658
Location: You lost the game.
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| Posted: Sun May 03, 2009 7:08 pm Post subject: |
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Oh wow, that's what I get for using a data type I never messed around with before  .
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