Convert image to byte array
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Hi, I need some help to convert an image to byte array and byte array to image. Can any one help? :)
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Hi, I need some help to convert an image to byte array and byte array to image. Can any one help? :)
You can start with GetDIBits GDI API function. GetDIBits The GetDIBits function retrieves the bits of the specified compatible bitmap and copies them into a buffer as a DIB using the specified format. int GetDIBits( HDC hdc, // handle to DC HBITMAP hbmp, // handle to bitmap UINT uStartScan, // first scan line to set UINT cScanLines, // number of scan lines to copy LPVOID lpvBits, // array for bitmap bits LPBITMAPINFO lpbi, // bitmap data buffer UINT uUsage // RGB or palette index );
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Hi, I need some help to convert an image to byte array and byte array to image. Can any one help? :)
Jose's reply is great for HBITMAPs. Just using the word "image" is extremely vague. It's a lot easier for us to help you if you're a bit more specific. What kind of image? What format is the image? etc... Mark
Mark Salsbery Microsoft MVP - Visual C++ :java:
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Hi, I need some help to convert an image to byte array and byte array to image. Can any one help? :)
You don't need to: images are just a byte arrays. :rolleyes:
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Jose's reply is great for HBITMAPs. Just using the word "image" is extremely vague. It's a lot easier for us to help you if you're a bit more specific. What kind of image? What format is the image? etc... Mark
Mark Salsbery Microsoft MVP - Visual C++ :java:
Actually i am writing code to diaply image read by an imagescanner device. In this i need to support all formats of images. So, i need to display an image which is in byte array format. How to do that?
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Actually i am writing code to diaply image read by an imagescanner device. In this i need to support all formats of images. So, i need to display an image which is in byte array format. How to do that?
hari_honey wrote:
i need to support all formats of images
All? That's pretty ambitious. Many image formats are published. You'll need to study the format specifications and read/write the byte streams accordingly. For BMP, GIF, JPEG, Exif, PNG, and TIFF, GDI+[^] can help. Mark
Mark Salsbery Microsoft MVP - Visual C++ :java:
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You can start with GetDIBits GDI API function. GetDIBits The GetDIBits function retrieves the bits of the specified compatible bitmap and copies them into a buffer as a DIB using the specified format. int GetDIBits( HDC hdc, // handle to DC HBITMAP hbmp, // handle to bitmap UINT uStartScan, // first scan line to set UINT cScanLines, // number of scan lines to copy LPVOID lpvBits, // array for bitmap bits LPBITMAPINFO lpbi, // bitmap data buffer UINT uUsage // RGB or palette index );
How to get the blob data from this function? where is the blob data found in it??
