C ++编译错误:“从'WCHAR *'到'WORD'的广播丢失精度" [英] C++ compilation error: "cast from 'WCHAR*' to 'WORD' loses precision"

问题描述

MyGUI库.

其来源中有一行:

mHandle = (size_t)::LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW));

mHandle 是size_t

LoadCursor 返回HCURSOR.

错误:

D:\Dev\MyGUI_3.2.0_RC1\Common\Input\Win32\ResourceW32Pointer.cpp:48: error: cast
from 'WCHAR*' to 'WORD' loses precision

这是完整资料来源:
www.pastebin.com/gzqLBFh9

Here's the full source:
www.pastebin.com/gzqLBFh9

MinGW编译器.

出现错误cast from 'CHAR*' to 'WORD' loses precision，并且 selbie 提供了在此处添加宏的建议:

There was error cast from 'CHAR*' to 'WORD' loses precision and selbie gave an advice to add macro here: Create window with WNDCLASSEX? [Cpp] . Thanks to him - it disappeared.

推荐答案

问题实际上出在MAKEINTRESOURCE(IDC_ARROW)上，与mHandle的类型无关. [此外:我同意mHandle不应为size_t，但我认为这不是您当前的问题.]

The problem is actually at MAKEINTRESOURCE(IDC_ARROW) and isn't related to the type of mHandle. [Aside: I agree that mHandle should not be size_t but I think that is not your current problem.]

由于IDC_ARROW被定义为MAKEINTRESOURCE(32512)，因此该代码实际上应读为

Since IDC_ARROW is defined to be MAKEINTRESOURCE(32512), the code should in fact read

LoadCursor(NULL, IDC_ARROW)

而不是

LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW))

后面的代码失败，因为IDC_ARROW为LPTSTR，但MAKEINTRESOURCE()期望为WORD.这就解释了您看到的错误消息.实际上，IDC_ARROW已经是一种资源类型，不需要进一步处理.

The latter code fails because IDC_ARROW is LPTSTR but MAKEINTRESOURCE() expects WORD. That explains the error message you see. In fact IDC_ARROW is already a resource type and needs no further processing.

同样，对LoadCursor()的所有其他调用都出错.

Likewise, all the other calls to LoadCursor() are in error.

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