通过 Windows 窗体元素使用 Win32 库

发布于 2024-09-18 19:56:31 字数 1015 浏览 6 评论 0原文

我在 Visual C++ 2008 中使用 Windows 窗体创建了一个简单的 GUI。GUI 中有一个按钮。当按下按钮时，我希望鼠标光标指向坐标（0,900）。我创建了单独的标头和 C++ 源文件，将光标位置设置为指定位置 (x,y)。为此，我使用了 Win32 的 SetCursorPos() 函数。我在单独的文件中编写了用于设置光标位置的代码，因为我只想使用 .NET 构建 GUI。对于其他功能，我想使用本机 C++ 和 Win32 库。

在构建代码时，我在链接时收到以下错误消息：

1>SimpleForms.obj : error LNK2028: unresolved token (0A00000F) "extern "C" int __stdcall SetCursorPos(int,int)" (?SetCursorPos@@$$J18YGHHH@Z) referenced in function "private: void __clrcall SimpleForms::Form1::button1_Click(class System::Object ^,class System::EventArgs ^)" (?button1_Click@Form1@SimpleForms@@$$FA$AAMXP$AAVObject@System@@P$AAVEventArgs@4@@Z)

1>SimpleForms.obj : error LNK2019: unresolved external symbol "extern "C" int __stdcall SetCursorPos(int,int)" (?SetCursorPos@@$$J18YGHHH@Z) referenced in function "private: void __clrcall SimpleForms::Form1::button1_Click(class System::Object ^,class System::EventArgs ^)" (?button1_Click@Form1@SimpleForms@@$$FA$AAMXP$AAVObject@System@@P$AAVEventArgs@4@@Z)

原文

I have created a simple GUI using Windows Forms in visual C++ 2008. There is a button in the GUI. When the button is pressed I want mouse cursor to point at coordinates (0,900). I have created separate header and c++ source file that sets the cursor position to specified location (x,y). For this I have used Win32's SetCursorPos() function. I wrote the code for setting the cursor position in a separate file because I want only the GUI to be built using .NET. For other functions I want to use native C++ and Win32 library.

While building the code, I get following error messages at the time of linking:

1>SimpleForms.obj : error LNK2028: unresolved token (0A00000F) "extern "C" int __stdcall SetCursorPos(int,int)" (?SetCursorPos@@$J18YGHHH@Z) referenced in function "private: void __clrcall SimpleForms::Form1::button1_Click(class System::Object ^,class System::EventArgs ^)" (?button1_Click@Form1@SimpleForms@@$FA$AAMXP$AAVObject@System@@P$AAVEventArgs@4@@Z)

1>SimpleForms.obj : error LNK2019: unresolved external symbol "extern "C" int __stdcall SetCursorPos(int,int)" (?SetCursorPos@@$J18YGHHH@Z) referenced in function "private: void __clrcall SimpleForms::Form1::button1_Click(class System::Object ^,class System::EventArgs ^)" (?button1_Click@Form1@SimpleForms@@$FA$AAMXP$AAVObject@System@@P$AAVEventArgs@4@@Z)

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人│生佛魔见 2024-09-25 19:56:31

(?SetCursorPos@@$$J18YGHHH@Z)

请注意函数名称如何获得 C++ 名称修饰。您的函数声明是错误的，需要使用 extern "C" 。只需包含即可避免此类错误。

但是，不要这样做。 Windows 窗体也允许您移动光标：

    System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
        System::Windows::Forms::Cursor::Position = Point(0, 900);
    }

我被名称装饰严重误导了，这是一条令人不快的链接器错误消息。真正的问题是您的项目没有链接所需的 Windows 导入库。右键单击项目、属性、链接器、输入。从“附加依赖项”设置中删除 $(NoInherit)。如果您使用 VS2010，则将“user32.lib”放入该设置中。

在这种特定情况下，您仍然应该使用 .NET Cursor 类。

(?SetCursorPos@@$$J18YGHHH@Z)

Note how the function name got the C++ name decoration. Your declaration of the function is wrong, using extern "C" is required. Avoid these kind of mistakes by simply including <windows.h>.

But, don't do it this way. Windows Forms lets you move the cursor too:

    System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
        System::Windows::Forms::Cursor::Position = Point(0, 900);
    }

I was seriously misled by the name decoration, that's an unpleasant linker error message. The real problem is that your project isn't linking the required Windows import library. Right-click the project, Properties, Linker, Input. Remove the $(NoInherit) from the Additional Dependencies setting. If you use VS2010 then put "user32.lib" in that setting.

You should still use the .NET Cursor class in this specific case.

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