371 questions
How to will "string" type convert "IStream" type in MFC frammework
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(115.19999999999999, 42%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EH%3C/text%3E%3C/svg%3E)
heyangben
81
Reputation points
In MFC framework
I want to Load JPG images into “picture Control“ Control by calling "CImage. Load (IStream*)", but I don't know how to convert string to IStream, does anyone know how to solve this problem? I don't want to save it locally and then Load it by calling "CImage. Load (LPCTSTR)". I just want to load picture in memory
Or there are other ways to implement this requirement?
I just don't want to save it locally
I want to load it directly into "Picture Control" Control
Developer technologies Visual Studio Testing
Developer technologies C++
3,972 questions
{count} votes
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(92.8, 12%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDL%3C/text%3E%3C/svg%3E)
David Lowndes 4,726 Reputation points2022-07-06T09:29:36.01+00:00 Have a look at SHCreateMemStream to get your string (memory buffer) as an IStream pointer.
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RLWA32 49,536 Reputation points2022-07-06T09:45:11.51+00:00 What is the imgStr variable?
Another Windows API function to create a stream and return an IStream interface pointer is CreateStreamOnHGlobal
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heyangben 81 Reputation points
2022-07-06T09:55:09.137+00:00 Thank you very much
imgStr is a string type -
heyangben 81 Reputation points
2022-07-06T09:55:39.977+00:00 thank you,I go to see
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heyangben 81 Reputation points
2022-07-06T10:31:17.467+00:00 It contains all the bytestreams of this picture
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RLWA32 49,536 Reputation points
2022-07-06T10:38:44.433+00:00 As long as the std::string object contains all of the binary data for your image and you know the number of bytes you should be able to use either method to obtain an IStream. @David Lowndes suggestion to use SHCreateMemStream seems to be the most direct way to go.
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RLWA32 49,536 Reputation points
2022-07-07T11:25:37.863+00:00 Have you made any progress?
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