(PECL cairo >= 0.1.0)
CairoImageSurface::getData — Gets the image data as string
Returns the image data of this surface or NULL if surface is not an image surface, or if CairoContext::finish(), procedural : cairo_surface_finish(), has been called.
此函数没有参数。
The image data as string
Example #1 CairoImageSurface::getData() example
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/* ... */
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以上例程的输出类似于：
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