ImageCodecInfo and GetEncoders

[Steve McLellan]

Hi,

I'm trying to call GetEncoders in C++. I've got code that does it
successfully in C# but whatever I do I seem to get errors.

The lines below, which is my current hacked off state, cause the problem:

System:rawing::Imaging::ImageCodecInfo __gc *encoders __gc[];
encoders = System:rawing::Imaging::ImageCodecInfo::GetImageEncoders();

The error is error C2691: 'unsigned char __gc[]' : invalid type for __gc
array element

Any help much appreciated, before I rampage murderously through the office.

Steve

 

[Ronald Laeremans [MSFT]]

VC does not support .Net jagged arrays (arrays of arrays) in the 7.0 and 7.1
releases. The only reasonable workaround I know of is to write an
intermediate class in another language (probably C# would be the closest)
that turns the jagged array into a rectangular array.

There is virtually no use of jagged arrays in the .Net framework and this
specific function is one of the very rare exceptions.

Ronald Laeremans
Visual C++ team

 

[Steve McLellan]

Doh! I was hoping this wasn't the cause of the problem, but it seems I'm
wrong... if I'm going to have to write a C# wrapper I might as well do the
whole function in C# (it's for saving a file). Presumably in this case I can
write a C# function that takes a string and a System.Drawing.Image type? Not
had much experience with wrapping in .NET. Out of interest, is this going to
be remedied in Whidbey?

Thanks,

Steve

VC does not support .Net jagged arrays (arrays of arrays) in the 7.0 and 7.1
releases. The only reasonable workaround I know of is to write an
intermediate class in another language (probably C# would be the closest)
that turns the jagged array into a rectangular array.

There is virtually no use of jagged arrays in the .Net framework and this
specific function is one of the very rare exceptions.

Ronald Laeremans
Visual C++ team

Hi,

I'm trying to call GetEncoders in C++. I've got code that does it
successfully in C# but whatever I do I seem to get errors.

The lines below, which is my current hacked off state, cause the problem:

System:rawing::Imaging::ImageCodecInfo __gc *encoders __gc[];
encoders = System:rawing::Imaging::ImageCodecInfo::GetImageEncoders();

The error is error C2691: 'unsigned char __gc[]' : invalid type for __gc
array element

Any help much appreciated, before I rampage murderously through the office.

Steve

 

[Ronald Laeremans [MSFT]]

Yes, it is remedied in Whidbey.

Ronald

Doh! I was hoping this wasn't the cause of the problem, but it seems I'm
wrong... if I'm going to have to write a C# wrapper I might as well do the
whole function in C# (it's for saving a file). Presumably in this case I can
write a C# function that takes a string and a System.Drawing.Image type? Not
had much experience with wrapping in .NET. Out of interest, is this going to
be remedied in Whidbey?

Thanks,

Steve

VC does not support .Net jagged arrays (arrays of arrays) in the 7.0 and 7.1
releases. The only reasonable workaround I know of is to write an
intermediate class in another language (probably C# would be the closest)
that turns the jagged array into a rectangular array.

There is virtually no use of jagged arrays in the .Net framework and this
specific function is one of the very rare exceptions.

Ronald Laeremans
Visual C++ team

Hi,

I'm trying to call GetEncoders in C++. I've got code that does it
successfully in C# but whatever I do I seem to get errors.

The lines below, which is my current hacked off state, cause the problem:

System:rawing::Imaging::ImageCodecInfo __gc *encoders __gc[];
encoders = System:rawing::Imaging::ImageCodecInfo::GetImageEncoders();

The error is error C2691: 'unsigned char __gc[]' : invalid type for __gc
array element

Any help much appreciated, before I rampage murderously through the office.

Steve