CODEWITHSUNDEEP
c++gifgiflib
Vahagn Tumanyan
Vahagn Tumanyan

Reputation: 514

Trying to encode a GIF file using giflib

I am given image data and color table I am trying to export it as a single frame GIF using giflib. I looked into the API, but can't get it to work. The program crashes even at the first function: 

GifFileType image_out;
int errorCode = 0;
char* fileName = "SomeName.gif";
image_out = *EGifOpenFileName(fileName,true, &errorCode);

It is my understanding that I first need to open a file by specifying it's name and then update it with fileHandle. Then Fill in the screen description, the extension block the image data and add the 3B ending to the file. Then use EGifSpew to export the whole gif. The problem is that I can't even use EGifOpenFileName(); The program crashes at that line.

Can someone help me the API of giflib? This problem is getting really frustrating. Thanks.

EDIT:

For the purposes of simple encoding I do not want to specify a color table and I just want to encode a single frame GIF.

Upvotes: 0

Views: 1208

Answers (1)

Mine
Mine

Reputation: 4241

The prototype is:

GifFileType *EGifOpenFileName(char *GifFileName, bool GifTestExistance, int *ErrorCode)

You should write as

GifFileType* image_out = EGifOpenFileName(fileName,true, &errorCode);

Note GifFileType is not POD type so you should NOT copy like that.

Upvotes: 2

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