发信人: tjam()
整理人: wenbobo(2002-12-06 22:25:29), 站内信件
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【 在 love1974 (<marquee>令狐冲</) 的大作中提到:
重新定义FARPROC因为在MFC里的定义是无参数的..
#define (MYFARPROC*) xxxx....
返回MYFARPROC的指针...
MYFARPROC *m_addr = (MYFARPROC*)GetProcAddress(xxxx);
(*m_addr)(xx,xx);
然后调用可跟参数 are you clear?
for instance:
BOOL GetDiscFreeSpace(LPCTSTR lpszPath, DWORDLONG* pnFree)
{
BOOL bRet = FALSE;
// We need to determine whether GetDiskFreeSpaceEx is available by
calling LoadLibrary
// or LoadLibraryEx, to load Kernel32.DLL, and then calling the Get
ProcAddress to
// obtain an address for GetDiskFreeSpaceEx. If GetProcAddress fai
ls, or if
// GetDiskFreeSpaceEx fails with the ERROR_CALL_NOT_IMPLEMENTED cod
e, we use the
// GetDiskFreeSpace function instead.
HINSTANCE hInstance = LoadLibrary("KERNEL32.DLL");
if(hInstance) // If we got the library
{
typedef BOOL (FAR WINAPI *MYFARPROC)(LPCSTR,ULARGE_INTEGER*,ULARG
E_INTEGER*,ULARGE_INTEGER*);
MYFARPROC lpfnDLLProc=NULL;
//(LPCSTR,ULARGE_INTEGER*,ULARGE_INTEGER*,ULARGE_INTEGER*);
//= NULL;
lpfnDLLProc = (MYFARPROC)GetProcAddress(hInstance, "GetDiskFreeSp
aceExA");
if(lpfnDLLProc) // If we got an address to the function
{
ULARGE_INTEGER nTotalBytes, nTotalFreeBytes, nTotalAvailable;
if((*lpfnDLLProc)(lpszPath, &nTotalAvailable, &nTotalBytes, &nTotalFr
eeBytes))
// if(GetDiskFreeSpaceEx(lpszPath, &nTotalAvailable, &nTotalBytes, &
nTotalFreeBytes))
{
*pnFree = nTotalAvailable.QuadPart;
bRet = TRUE;
}
}
FreeLibrary(hInstance);
}
if(!bRet) // We have to try and use GetDiskFreeSpace()
{
ULONG secpercluster, bytespersec, nooffreeclusters, totaln
oofclusters;
if(GetDiskFreeSpace(lpszPath, &secpercluster, &bytespersec,
&nooffreeclusters, &totalnoofclusters))
{
*pnFree = (nooffreeclusters * secpercluster * bytespersec);
bRet = TRUE;
}
}
return bRet;
}
--
春风再美也比不上你的笑,
没见过你的人不会明了!
--
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
^v^ Name:James Tan ^o^
^v^ E-mail:[email protected] ^o^
※ 修改:．tjam 于 Oct 6 15:51:21 修改本文．[FROM: 202.101.14.205]
※ 来源:．月光软件站 http://www.moon-soft.com．[FROM: 202.101.14.205]
=================================================
发信人: lightsabre (cheers), 信区: CLanguage
标 题: Re: 容姐,用GETPROCADDRESS返回一个DLL函数指针,然后怎么调用,如何处理函数参数?(举例)
发信站: 网易虚拟社区 (Thu Oct 7 02:24:10 1999), 站内信件
Say, you have a function
double MyMulti(double x, double y);
exported from the DLL, do the following in your code:
typedef double ( * lpFunc)(double, double);
HINSTANCE hLibrary;
lpFunc func1;
hLibrary = ::LoadLibrary("yourdllname.dll"); //Load DLL
if (hLibrary != NULL)
{
func1 = =(lpFunc) ::GetProcAddress(hLibrary, "MyMulti");
if (func1 != NULL)
{
double dblResult = ((func1)(1.0,2.0));
}
}
::FreeLibrary(hLibrary);
--
※ 来源:．月光软件站 http://www.moon-soft.com．[FROM: 4.54.50.182]
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