如何得到剪贴板中图片的长度和宽度？（C++）

Question

我的代码是：

		Windows::ApplicationModel::DataTransfer::Clipboard^ a;
		auto b = a->GetContent();
		if (!b->Contains(Windows::ApplicationModel::DataTransfer::StandardDataFormats::Bitmap)){
			return;
		}
		create_task(b->GetBitmapAsync()).then([this](Windows::Storage::Streams::RandomAccessStreamReference^ c){
			try{
				create_task(c->OpenReadAsync()).then([this](Windows::Storage::Streams::IRandomAccessStreamWithContentType^ d){
					try{
						auto m_bm = ref new WriteableBitmap(1, 1);
						m_bm->SetSource(d);
						wb_ = ref new WriteableBitmap(m_bm->PixelWidth, m_bm->PixelHeight);
						unsigned int length;
						byte* temp_m_bm = GetPointerToPixelData(m_bm->PixelBuffer, &length);
						byte* temp_wb_ = GetPointerToPixelData(wb_->PixelBuffer, &length);
						for (unsigned int k = 0; k <unsigned int(height); k++){
							for (unsigned int i = 0; i < unsigned int(width * 4); i += 4){
								int pos = k * (width * 4) + (i);
								temp_wb_[pos + 0] = temp_m_bm[pos + 0];
								temp_wb_[pos + 1] = temp_m_bm[pos + 1];
								temp_wb_[pos + 2] = temp_m_bm[pos + 2];
								temp_wb_[pos + 3] = temp_m_bm[pos + 3];
							}
						}
						Pic->Source = wb_;
					}
					catch (int c){
						c++;
					}
				});
			}
			catch (int c){
				c++;
			}
		});

但是过程中我无法直接知道b的图片长宽，而是分别转换到c和d以后进行了setsource才知道的。请问怎样才能直接得知。

（这段代码在调试中没有问题，但是到了非调试模式会退出（返回到开始屏幕））

Answer 1

你好 lxylxy123456,

DataPackageView中返回的值仅仅是一个Image的流，所以是没办法直接获取image的大小，必须把image从流转化出来才可以。

可以直接通过 m_bm->PixelHeight来获取高度，PixelWidth来获取长度。

另外我这里运行我下面代码的时候不会崩溃，你试试看。

	Windows::ApplicationModel::DataTransfer::Clipboard^ a;
	auto b = a->GetContent();
	if (!b->Contains(Windows::ApplicationModel::DataTransfer::StandardDataFormats::Bitmap)){
		return;
	}
	create_task(b->GetBitmapAsync()).then([this](Windows::Storage::Streams::RandomAccessStreamReference^ c){
		try{
			create_task(c->OpenReadAsync()).then([this](Windows::Storage::Streams::IRandomAccessStreamWithContentType^ d){
				try{
					auto m_bm = ref new WriteableBitmap(1, 1);
					m_bm->SetSource(d);

					auto height = m_bm->PixelHeight;
					auto width = m_bm->PixelWidth;

					//auto wb_ = ref new WriteableBitmap(m_bm->PixelWidth, m_bm->PixelHeight);
					//unsigned int length;
					//byte* temp_m_bm = GetPointerToPixelData(m_bm->PixelBuffer, &length);
					//byte* temp_wb_ = GetPointerToPixelData(wb_->PixelBuffer, &length);
					//for (unsigned int k = 0; k <unsigned int(height); k++){
					//	for (unsigned int i = 0; i < unsigned int(width * 4); i += 4){
					//		int pos = k * (width * 4) + (i);
					//		temp_wb_[pos + 0] = temp_m_bm[pos + 0];
					//		temp_wb_[pos + 1] = temp_m_bm[pos + 1];
					//		temp_wb_[pos + 2] = temp_m_bm[pos + 2];
					//		temp_wb_[pos + 3] = temp_m_bm[pos + 3];
					//	}
					//}
					//Pic->Source = wb_;
				}
				catch (int c){
					c++;
				}
			});
		}
		catch (int c){
			c++;
		}
	});

--James

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Answer 2

我突然发现没问题了，谢谢解答！如果再次出现问题我会告诉你。