如何在C＃中确定swf文件的actionscript版本？

读取SWF文件的前4个字节。前3个字节是读取（CWS或FWS）的签名，下一个字节是SWF文件版本。所以你不需要任何库，只需简单的文件IO就足够了。对于动作脚本版本，您需要查找FileAttributes标签。所以这里是做这个的伪代码。（在SWF文件中的数据是Little Endian，所以请相应地编写你的readInt或readShort函数）。

signature = read 3 UTF Bytes as String; 
version = read one byte; 
size = read unsigned int; (int is 32 bit) 
if (signature == "CWS") // i.e. SWF is compressed 
    then uncompress the rest of the bytes; //swf uses zlib compression, first 7 bytes are compressed 
rect_byte = read unsigned Byte; 
rect_bits = rect_byte >> 3; //first 5 bits says how many bits are required for one dimensoin of the swf 
total_bits = rect_bits * 4; 
rect_bytes = Math.ceil((total_bits - 3)/ 8); //till here we have information about swf dimension 
read rect_bytes number of bytes; 
read unsigned short as frame rate; 
read unsigned short as frame count; 
while true do { 
    read unsigned short into swf_tag_code_len; 
    tagcode = swf_tag_code_len >>6; // first 6 bits determine the tag code 
    taglen = swf_tag_code_len & 0x3F; // last 10 bits determines the length of tag (if length is less than 63) 
    if (taglen >= 63) { // if tag is bigger than 63 bytes, then next four bytes tell the length 
    taglen = read unsgined int; 
    } 
    if (tagcode == 69) {// here we go, we are looking for this tag (fileattribute) { 
    b = read unsigned byte; 
    if (b & (1 << 3)) { // 4th least significant bit tell about actionscript version 
     it is actionscript version 3; 
    } else { either it is 1.0 or 2.0;} 
    } 
}

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2010-02-03 07:27:50 bhups

如何将SWF文件版本字节转换为actionscript版本？ – 2010-02-03 22:08:36

只有swf文件使用actionscript版本3.0或更高版本时，才能说明。您需要查找FileAttributes标签。我用相同的伪代码编辑了答案。希望能帮助到你。 – bhups 2010-02-04 05:50:25

有一个商业库，可以与你的努力帮助：

http://www.aspose.com/categories/.net-components/aspose.flash-for-.net/default.aspx

然而，你的另一种选择是分析和直接读取SWF和使用这样的指南：http://www.m2osw.com/swf_alexref.html

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2010-02-02 22:01:24

如何在C＃中确定swf文件的actionscript版本？

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