Is there any limit of the size of data that can be copied to clipboard? I am using VB6 and need to copy blocks of data to the clipboard.
Applications call GlobalAlloc(GMEM_MOVEABLE or GMEM_DDESHARE) to allocate the memory for data to be stored on the clipboard and make it available to other applications. For 32-bit applications GlobalAlloc can allocate blocks up to 2 GB in size or up to the amount of virtual memory the PC has, whichever is less. The Windows clipboard does not impose any other size limits.
Most data is copied as a reference rather than the data itself so you can copy most anything any size. Text though is actually copied and from what I know the amount of data is limited to how much ram is currently availiable. Remember this, if vb6 can handle it, I'm sure the clipboard can handle it.
Depends on the amount of memory in the system.
来源：https://stackoverflow.com/questions/1321866/clipboard-size-limit