关于LoadImage

要写一个位图播放软件demo，用定时器每隔100ms从硬盘中读取一副位图然后显示，所以用API LoadImage从硬盘中读取位图，函数调用如下

HBITMAP bmp = (HBITMAP)LoadImage(NULL, strFileName.GetBuffer(), IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_LOADFROMFILE)

结果定时器计数到50~60次时，动画便停止。

本来以为是定时器被堵死，无法响应中断，然后尝试将文件放到内存中直接显示，结果问题还是存在。

然后单步调试跟踪发现是LoadImage在执行了50~60次以后载入位图出错，bmp地址为0x00000000，参阅MSDN

LoadImage
  <script src="langref.js"></script> 
The LoadImage function loads an icon, cursor, animated cursor, or bitmap.
 
HANDLE LoadImage(
  HINSTANCEhinst,


   // handle to instance
  LPCTSTRlpszName,  


// image to load
  UINTuType,        


// image type
  intcxDesired,     


// desired width
  intcyDesired,     


// desired height
  UINTfuLoad


// load options
);

Parameters

hinst

[in] Handle to an instance of the module that contains the image to be loaded. To load an OEM image, set this parameter to zero. lpszName

[in] Specifies the image to load. If the hinst parameter is non-NULL and the

fuLoad parameter omits LR_LOADFROMFILE,

lpszName specifies the image resource in the

hinst module. If the image resource is to be loaded by name, the

lpszName parameter is a pointer to a null-terminated string that contains the name of the image resource. If the image resource is to be loaded by ordinal, use the

MAKEINTRESOURCE macro to convert the image ordinal into a form that can be passed to the

LoadImage function.

If the hinst parameter is NULL and the fuLoad parameter omits the LR_LOADFROMFILE value, the lpszName specifies the OEM image to load. The OEM image identifiers are defined in Winuser.h and have the following prefixes.

To pass these constants to the LoadImage function, use the MAKEINTRESOURCE macro. For example, to load the OCR_NORMAL cursor, pass MAKEINTRESOURCE (OCR_NORMAL) as the lpszName parameter and NULL as the hinst parameter.

If the fuLoad parameter includes the LR_LOADFROMFILE value, lpszName is the name of the file that contains the image.

uType

cxDesired

[in] Specifies the width, in pixels, of the icon or cursor. If this parameter is zero and the fuLoad parameter is LR_DEFAULTSIZE, the function uses the SM_CXICON or SM_CXCURSOR system metric value to set the width. If this parameter is zero and LR_DEFAULTSIZE is not used, the function uses the actual resource width.

cyDesired

[in] Specifies the height, in pixels, of the icon or cursor. If this parameter is zero and the fuLoad parameter is LR_DEFAULTSIZE, the function uses the SM_CYICON or SM_CYCURSOR system metric value to set the height. If this parameter is zero and LR_DEFAULTSIZE is not used, the function uses the actual resource height.

fuLoad

当加载OEM位图，并且fuLoad为LR_LOADFROMFILE，hinst可以等于NULL，所以将函数调用修改为

HBITMAP bmp = (HBITMAP)LoadImage(AfxGetInstanceHandle(), strFileName.GetBuffer(), IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_LOADFROMFILE);

一切OK。但是问题是能够正常运行一段时间，然后动画终止？