C ++ picturebox图像下载 [英] C++ picturebox image download

问题描述

您好，

我正在尝试使用OpenFileDialog（）方法将图像添加到PictureBox中。



我是什么尝试过：

Hello,
I'm trying to add an image into PictureBox with OpenFileDialog() method.

What I have tried:

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
    OpenFileDialog^ ofd = gcnew OpenFileDialog;
    ofd->InitialDirectory = "C:\\";
    ofd->Filter =
        "Images (*.bmp;*.gif;*.jpg;*.jpeg;*.png)|"
        "*.bmp;*.gif;*.jpg;*.jpeg;*.png|"
        "Bitmaps (*.bmp)|*.bmp|"
        "GIFs (*.gif)|*.gif|"
        "JPEGs (*.jpg)|*.jpg;*.jpeg|"
        "PNGs (*.png)|*.png";
    ofd->FilterIndex = 1;
    if (ofd->ShowDialog() == System::Windows::Forms::DialogResult::OK) {
            pictureBox11->Image = Image::FromFile(ofd->FileName);
            pictureBox11->SizeMode = PictureBoxSizeMode::StretchImage;
        }
    else {
        MessageBox::Show("Can't open the file. Wrong file type", "ERROR", MessageBoxButtons::OK, MessageBoxIcon::Error) == System::Windows::Forms::DialogResult::No;
    }
    }

但是当我点击此按钮时，下一条消息显示：

'系统。 Threading.ThreadStateException：'在进行OLE调用之前，必须将当前线程设置为单线程单元（STA）模式。确保您的Main函数标记了STAThreadAttribute。只有在调试器附加到进程时才会引发此异常。'

推荐答案

由于您实际上没有发布调试器，我将假设您的问题你是怎么做的那个消息。答案在消息中给出。

Since you haven't actually posted one, I will assume your question is what do you do about that message. The answer is given in the message.

Quote：

确保你的Main函数上标有STAThreadAttribute

Ensure that your Main function has STAThreadAttribute marked on it

如果那不是你以后那么你应该考虑实际问一个问题。

If that is not what you are after then you should consider actually asking a question.

当您阅读 STAThreadAttribute 你会读到：

你正在开发一个Windows Forms应用程序。如果Windows Forms应用程序与Windows系统通信，它们必须是单线程的组件，如剪贴板或Windows常用对话框，或者如果他们使用系统功能，如拖放功能



什么意味着你需要在项目设置中设置它以使用公共文件对话框。这些问题被称为：按设计工作

When your read the documentation of STAThreadAttribute from Microsoft you would have read that:
"You're developing a Windows Forms app. Windows Forms apps must be single-threaded if they communicate with Windows system components such as the Clipboard or Windows common dialog boxes, or if they use system features such as drag-and-drop functionality"

What means that you need to set that in the project settings to use the Common File Dialog. Such problems are knowns as: "Works as designed"

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