新手问题

[wiw]

全局名字空间明明有PRINTER_INFO_2和EnumPrinters，为什么总提示
error C2039: 'PRINTER_INFO_2' : is not a member of '`global namespace''
error C2039: 'EnumPrinters' : is not a member of '`global namespace''

[rcswhuang]

PRINTER_INFO_2和EnumPrinters定义在那个文件里面？
不是同一个文件，要用extern来引进来

[wiw]

真是奇怪啊，PRINTER_INFO_2明明在windows.h中定义了，我也include "windows.h" 了,为什么还提示PRINTER_INFO_2末定义呢？？？？

[wiw]

不是Windows.h，是Winspool.h中定义的

[wiw]

原来include winspool.h可以,include windows.h报错，但是在Windows.h中已经include winspool.h了啊，奇怪，难道是因为宏的问题？

[wiw]

#ifdef UNICODE
#define GETDEFAULTPRINTER "GetDefaultPrinterW"
#else
#define GETDEFAULTPRINTER "GetDefaultPrinterA"
#endif

BOOL PrinterDevice::DPGetDefaultPrinter(LPTSTR pPrinterName,LPDWORD pdwBufferSize)
{
BOOL bFlag;
OSVERSIONINFO osv;
TCHAR cBuffer[MAXBUFFERSIZE];
::PRINTER_INFO_2 *ppi2 = NULL;
DWORD dwNeeded = 0;
DWORD dwReturned = 0;
HMODULE hWinSpool = NULL;
PROC fnGetDefaultPrinter = NULL;

osv.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
GetVersionEx(&osv);
if (osv.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
{
SetLastError(0);
bFlag = ::EnumPrinters(PRINTER_ENUM_DEFAULT,NULL,2,NULL,0,&dwNeeded,&dwReturned);
{
if ((GetLastError() != ERROR_INSUFFICIENT_BUFFER) || (dwNeeded == 0))
return FALSE;
}
ppi2 = (PRINTER_INFO_2 *)GlobalAlloc(GPTR, dwNeeded);
if(!ppi2)
return FALSE;
bFlag = ::EnumPrinters(PRINTER_ENUM_DEFAULT, NULL, 2, (LPBYTE)ppi2, dwNeeded, &dwNeeded, &dwReturned);
if (!bFlag)
{
GlobalFree(ppi2);
return FALSE;
}
if ((DWORD)lstrlen(ppi2->pPrinterName) >= *pdwBufferSize)
{
*pdwBufferSize = (DWORD)lstrlen(ppi2->pPrinterName) + 1;
GlobalFree(ppi2);
return FALSE;
}
lstrcpy(pPrinterName, ppi2->pPrinterName);
*pdwBufferSize = (DWORD)lstrlen(ppi2->pPrinterName) + 1;
}
else if (osv.dwPlatformId == VER_PLATFORM_WIN32_NT)
{
if (osv.dwMajorVersion >= 5) // Windows 2000 以上版本
{
hWinSpool = LoadLibrary("winspool.drv");
if (!hWinSpool)
return FALSE;
fnGetDefaultPrinter = GetProcAddress(hWinSpool, GETDEFAULTPRINTER);
if (!fnGetDefaultPrinter)
{
FreeLibrary(hWinSpool);
return FALSE;
}

bFlag = fnGetDefaultPrinter(pPrinterName, pdwBufferSize);
FreeLibrary(hWinSpool);
if (!bFlag)
return FALSE;
}
if (ppi2)
GlobalFree(ppi2);

return TRUE;
}

#undef MAXBUFFERSIZE
#undef GETDEFAULTPRINTER
看一看这段代码

[ouyh12345]

using全局命名空间了吗？
全局命名控件::EnumPrinters可以吗？

[ouyh12345]

没看见::PRINTER_INFO_2在哪声明了

[lixiaosan]

Requirements

Windows NT/2000/XP/Vista: Included in Windows NT 3.1 and later.
Windows 95/98/Me: Included in Windows 95 and later.
Header: Declared in Winspool.h; include Windows.h.
Unicode: Declared as Unicode and ANSI structures.

////////////////////////
or install platform SDK

[wiw]

还是不行啊，高手帮帮忙啊