昨天有朋友說按照我的另一篇文章《[原創]在VC++6.0中如何使用GDI+》的方法使用GDI++，但是會出現錯誤，我看了看他發來的程式，報的錯誤是這樣的：

e:\codebox\monitor\gdi\gdiplusinit.h(39) : error C2065: 'ULONG_PTR' : undeclared identifier
e:\codebox\monitor\gdi\gdiplusinit.h(39) : error C2065: 'token' : undeclared identifier
e:\codebox\monitor\gdi\gdiplusinit.h(39) : error C2165: 'left-side modifier' : cannot modify pointers to data
e:\codebox\monitor\gdi\gdiplusinit.h(39) : error C2071: 'NotificationHookProc' : illegal storage class
e:\codebox\monitor\gdi\gdiplusinit.h(40) : error C2146: syntax error : missing ')' before identifier 'token'
e:\codebox\monitor\gdi\gdiplusinit.h(40) : error C2165: 'left-side modifier' : cannot modify pointers to data
e:\codebox\monitor\gdi\gdiplusinit.h(40) : error C2071: 'NotificationUnhookProc' : illegal storage class
e:\codebox\monitor\gdi\gdiplusinit.h(40) : error C2059: syntax error : ')'
e:\codebox\monitor\gdi\gdiplusinit.h(91) : error C2059: syntax error : 'const'
e:\codebox\monitor\gdi\gdiplusinit.h(97) : error C2146: syntax error : missing ')' before identifier 'token'
e:\codebox\monitor\gdi\gdiplusinit.h(97) : warning C4229: anachronism used : modifiers on data are ignored
e:\codebox\monitor\gdi\gdiplusinit.h(97) : error C2182: 'GdiplusShutdown' : illegal use of type 'void'
e:\codebox\monitor\gdi\gdiplusinit.h(97) : error C2059: syntax error : ')'
e:\codebox\monitor\monitornetwork.h(23) : error C2146: syntax error : missing ';' before identifier 'm_pGdiToken'
e:\codebox\monitor\monitornetwork.h(23) : error C2501: 'ULONG_PTR' : missing storage-class or type specifiers
e:\codebox\monitor\monitornetwork.h(23) : error C2501: 'm_pGdiToken' : missing storage-class or type specifiers
E:\codebox\monitor\MonitorNetWork.cpp(133) : warning C4244: '=' : conversion from 'double' to 'int', possible loss of data
E:\codebox\monitor\MonitorNetWork.cpp(171) : error C2065: 'm_pGdiToken' : undeclared identifier

問題原因：GDI++是WIndows Platform SDK不是MFC的一部分，而ULONG_PTR在SDK中的定義與MFC中的定義相沖突，所以，會出現此問題。

解決辦法：新增#define ULONG_PTR ULONG ，具體如下：

#pragma comment(lib, "gdi//gdiplus.lib")
#define ULONG_PTR ULONG

#include "gdi/GdiPlus.h"
using namespace Gdiplus;

由於疏忽，忘記在那篇文章中寫清，抱歉，如以往的所有文章出現問題，請將問題發到我的郵箱：[email protected]