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[C]Help converting VCL Delphi to pure Win32 API

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DeletedUser14087
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Joined: 21 Jun 2006
Posts: 3069

Posted: Mon Mar 24, 2008 6:16 am Post subject: [C]Help converting VCL Delphi to pure Win32 API

i'm not sure of MSVC++ supports packed record but:

1)How would this look in C ?

Code:

LongRec = packed record
case Integer of
0: (Lo, Hi: Word);
1: (Words: array [0..1] of Word);
2: (Bytes: array [0..3] of Byte);
end;

i tried declaring an LPWORD and -> the var but nothing comes out, or at all nothing happens.

2)how do i declare public/private declerations in C ?

thanks !!

Dark Byte
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Posts: 25913
Location: The netherlands

Posted: Mon Mar 24, 2008 6:26 am Post subject:

1:
This comes closest to it:

Code:

union LongRec
{
struct
{
unsigned short lo;
unsigned short hi;
} lohi;
unsigned short words[2];
unsigned char bytes[4];
} number;

2:
in C (not c++) put your function declarations (and global vars if you dare to use them) in the header file to make them public, and in the C file to keep them private
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DeletedUser14087
I post too much

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Posts: 3069

Posted: Mon Mar 24, 2008 12:35 pm Post subject:

db, i wanted to try something new, so i did this:

Code:

BOOL FileExists(const char *FileName)
{
LPWIN32_FIND_DATAA FindData = NULL;
HANDLE THandle;

THandle = FindFirstFileA(FileName,FindData);
return THandle != INVALID_HANDLE_VALUE;
}

and when i finds the file i get an error "Debug" or "Close", why?

HomerSexual
Grandmaster Cheater Supreme

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Joined: 03 Feb 2007
Posts: 1657

Posted: Mon Mar 24, 2008 5:13 pm Post subject:

DeletedUser14087 return THandle != INVALID_HANDLE_VALUE; That returns THandles value but not the function i would do if(THandle != INVALID_HANDLE_VALUE){ return TRUE; }else{ return FALSE; _________________

atom0s
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Posts: 8585
Location: 127.0.0.1

Posted: Tue Mar 25, 2008 12:55 am Post subject:

blankrider wrote:

DeletedUser14087

return THandle != INVALID_HANDLE_VALUE;

That returns THandles value but not the function i would do

if(THandle != INVALID_HANDLE_VALUE){
return TRUE;
}else{
return FALSE;

Actually, you can obtain a boolean return using that method. Example to test with:

Code:

#include <windows.h>
#include <iostream>

bool GetExampleBoolean()
{
HANDLE hHandle = (HANDLE)1;
return (hHandle != INVALID_HANDLE_VALUE);
}

int main()
{
bool bReturn = false;
bReturn = GetExampleBoolean();

std::cout << "Value: " << bReturn;
std::cin.ignore();
std::cin.sync();
return 0;
}

The current output would be:

Value: 1 meaning true.

hHandle does not equal INVALID_HANDLE_VALUE which is -1. Then to test the counter part, just change
HANDLE hHandle = (HANDLE)1; to:
HANDLE hHandle = INVALID_HANDLE_VALUE;

And retest, you will get Value: 0 which failed the compare since it is the same.
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DeletedUser14087
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Posts: 3069

Posted: Tue Mar 25, 2008 7:16 am Post subject:

now i'm getting a new error, "Abort" :: "Retry" :: "Ignor"

Code:

int FileAge(const char *FileName)
{
LPWIN32_FIND_DATAA FindData;
HANDLE THandle;
LPFILETIME LFT;

THandle = FindFirstFileA(PCHAR(FileName),FindData);
if(THandle != INVALID_HANDLE_VALUE)
{
   FindClose(THandle);
   if(FindData->dwFileAttributes && FILE_ATTRIBUTE_DIRECTORY == 0)
   {
      FileTimeToLocalFileTime(&FindData->ftLastWriteTime, LFT);
   }
}
return -1;
}

bool FileExists(const char *FileName)
{
return FileAge(FileName) != -1;
}

HANDLE = LongWORD

EDIT!!!

nvm i got it to work !!

Code:

int FileExists(const char *FileName)
{
DWORD lol;
lol = GetFileAttributesA(PCHAR(FileName));
return lol != -1;
}

i didn't knew about GetFileAttributesA API until Renko toled me, then i didn't listen to him then x0r toled so i got insist and used it

Renkokuken
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Posts: 3249

Posted: Tue Mar 25, 2008 8:26 am Post subject:

DeletedUser14087 wrote:

now i'm getting a new error, "Abort" :: "Retry" :: "Ignor"

Code:

HANDLE = LongWORD

EDIT!!!

nvm i got it to work !!

Code:

int FileExists(const char *FileName)
{
DWORD lol;
lol = GetFileAttributesA(PCHAR(FileName));
return lol != -1;
}

i didn't knew about GetFileAttributesA API until Renko toled me, then i didn't listen to him then x0r toled so i got insist and used it

Well, that's nice to know you always ask me for help but don't listen...

Anyway, this is neater:

Code:

BOOL FileExists(__in LPTSTR lpszFileName)
{
return ( GetFileAttributes(lpszFileName) != 0xFFFFFFFF );
}

DeletedUser14087
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Posts: 3069

Posted: Tue Mar 25, 2008 8:28 am Post subject:

you're late, x0r toled me about the tchar.h library

Code:

int FileExists(LPCTSTR lpszFileName)
{
DWORD lol;
lol = GetFileAttributes(lpszFileName);
return lol != -1;
}

_T();

anyways, check what i've done so far with my header (i'm bored):

Code:

#include "windows.h"
#include "stdio.h"
#include "tchar.h"

int FileExists(LPCTSTR lpszFileName)
{
DWORD lol;
lol = GetFileAttributes(lpszFileName);
return lol != -1;
}

BOOL WriteMemory(LPSTR lpClassName, LPVOID lpBaseAddress, LPCVOID lpBuffer, SIZE_T nSize, SIZE_T *lpNumOfBytesWritten)
{
HANDLE hProc;
HWND FW;
DWORD pID,GWTID;

FW = FindWindowA(lpClassName,NULL);
GWTID = GetWindowThreadProcessId(FW,&pID);
hProc = OpenProcess(PROCESS_ALL_ACCESS,FALSE,pID);

return WriteProcessMemory(hProc,lpBaseAddress,lpBuffer,nSize, lpNumOfBytesWritten);

CloseHandle(hProc);
}

Renkokuken
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Posted: Tue Mar 25, 2008 8:37 am Post subject:

DeletedUser14087 wrote:

you're late, x0r toled me about the tchar.h library

Code:

int FileExists(LPCTSTR lpszFileName)
{
DWORD lol;
lol = GetFileAttributes(lpszFileName);
return lol != -1;
}

_T();

anyways, check what i've done so far with my header (i'm bored):

Code:

My version is still neater and more efficient. Also, your CloseHandle() is never reached since you're returning beforehand.

DeletedUser14087
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Posts: 3069

Posted: Tue Mar 25, 2008 8:51 am Post subject:

nice find, didn't saw that.

samuri25404
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Posted: Tue Mar 25, 2008 8:57 am Post subject:

I might not be that much of a C/++ guy, but aren't there only supposed to be decl's in your header, and not actual methods?

What if Microsoft actually put all the code for the methods in Windows.h... >_>
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DeletedUser14087
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Posted: Tue Mar 25, 2008 9:02 am Post subject:

samuri25404 wrote:

come again ? (i didn't understand what you mean)

samuri25404
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Posted: Tue Mar 25, 2008 9:08 am Post subject:

DeletedUser14087 wrote:

samuri25404 wrote:

come again ? (i didn't understand what you mean)

Uhh...

Ok, like you've got your method (function/procedure in Delphi), and you've got what it does.

I thought you were only supposed to declare the methods in your header, rather than actually writing everything out, then coding the whole method in your actual .cpp file.
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