IDirect3DSurface9::GetDC！ 调用类似很多D3D接口的方法怎么都返回错误：“不支持此方法”？

[vcPlayer]

DX8及以后的版本 与DX7 差别怎么就这么大呢:(？原来还可以用DC直接在DX里面绘图，现在怎么不行了呢？

我的要求很“简单”：就是在Surface上面绘点图，输两个字符而已。不知哪位仁兄有好的办法没？

错误：“不支持此方法”有什么更详细的说明吗：
1、接口版本不正确；
2、参数不正确；
3、接口指针错误；
……

[zhoujianhei]

DX8和DX9都有例子啊，参照一下。

[DRACULAX05]

DX9的版本已经把DC和Surface分开了，画图就用纹理，输出文字可以用ID3DXFont

[vcPlayer]

[Quote=引用 1 楼 DRACULAX05 的回复:]
DX9的版本已经把DC和Surface分开了，画图就用纹理，输出文字可以用ID3DXFont
[/Quote]

谢谢！这就去测试。。。

[palmax]

[Quote=引用 6 楼 yxz_lp 的回复:]
这个没用过，但MSDN上有说明，要获得hdc有如下限制
The following restrictions apply.

1）IDirect3DSurface9::GetDC is valid on the following formats only: D3DFMT_R5G6B5, D3DFMT_X1R5G5B5, D3DFMT_R8G8B8, and D3DFMT_X8R8G8B8. Formats that contain Alpha are not supported because the GDI implementations don't have a well-defined behavior on the alpha channel. For more information about formats, see …
[/Quote]

说得很清楚了

常见的就是在 锁住表面后又去 GetDC，因为GetDC会自动锁表面

[flm007]

如果别人能找到例子又何必发帖子问呢，多此一举，
俺不会，俺帮你顶，但俺不会做不懂装懂的境界

[vcPlayer]

呵呵，多谢各位同仁的帮助：）。问题已经解决一半，剩下的也在继续攻关中…………

看情况，还是要从IDirect3DSurface9::GetDC下手才行。。。。。

[yxz_lp]

这个没用过，但MSDN上有说明，要获得hdc有如下限制
The following restrictions apply.

1）IDirect3DSurface9::GetDC is valid on the following formats only: D3DFMT_R5G6B5, D3DFMT_X1R5G5B5, D3DFMT_R8G8B8, and D3DFMT_X8R8G8B8. Formats that contain Alpha are not supported because the GDI implementations don't have a well-defined behavior on the alpha channel. For more information about formats, see D3DFORMAT.
2）Only one device context per surface can be returned at a time.
3）IDirect3DSurface9::GetDC will fail if the surface is already locked. If the surface is a member of a mipmap or cubemap, IDirect3DSurface9::GetDC fails if any other mipmap or cubemap member is locked.
4）IDirect3DSurface9::GetDC fails on render targets unless they were created lockable (or, in the case of back buffers, with the D3DPRESENTFLAG_LOCKABLE_BACKBUFFER flag).
5）For surfaces not created with IDirect3DDevice9::CreateOffscreenPlainSurface, IDirect3DSurface9::GetDC will fail on default pool (D3DPOOL_DEFAULT) surfaces unless they are dynamic (D3DUSAGE_DYNAMIC) or are lockable render targets.
6）IDirect3DSurface9::GetDC will fail on D3DPOOL_SCRATCH surfaces.

[vcPlayer]

[Quote=引用 6 楼 yxz_lp 的回复:]
这个没用过，但MSDN上有说明，要获得hdc有如下限制
The following restrictions apply.

1）IDirect3DSurface9::GetDC is valid on the following formats only: D3DFMT_R5G6B5, D3DFMT_X1R5G5B5, D3DFMT_R8G8B8, and D3DFMT_X8R8G8B8. Formats that contain Alpha are not supported because the GDI implementations don't have a well-defined behavior on the alpha channel. For more information about formats, see …
[/Quote]

谢谢：）。我直接用的2008的帮助文档，所以没看见这个解释(也许是心急没发现)：（，也一直怀疑是创建设备的时候指定了什么属性导致有些方法不能使用。现正埋头测试。。。。
希望有熟悉的朋友能帮我缩短这个时间：）。。。

[vcPlayer]

掌嘴，就在函数下方：（！！！！！

[xqhrs232]

也在学习这方面的东西，ＭＡＲＫ

[qq845284425]

mark

[阿高]

始终无法活动HDC,郁闷中

[阿高]

打错了，是获取。。。