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var& = CVI(string$)
This function converts the bytes in
string$ into an integer value which has the same internal bit-pattern that
string$ has. If
string$ consists of 4 or more bytes, only its first 4 bytes are considered. If
string$ consists of 1, 2 or 3 bytes, then
CVI(string$) returns an 8-bit, 16-bit or 24-bit integer, respectively. If
string$ is a null string, then
CVI(string$) returns zero.
This function is useful for finding the integer form of such things as file types, creator signatures and resource types. For example:
ft$ = "TEXT"
theType& = CVI(ft$)
After executing the above,
theType& is then suitable for passing to a Toolbox routine which requires a file-type parameter.
theType& will also have the same value as the integer constant
The size (in bytes) of the value returned by
CVI depends on the length of
string$. It does not depend on the current setting of
DEFSTR BYTE/WORD/LONG. Therefore, if you want to assign the return value of
CVI to a short integer variable, you must make sure that
string$ is not longer than 2 bytes; otherwise, you'll get an unexpected value in your short integer variable. Similarly, if you want to correctly assign
CVI's return value to a byte variable, you should make sure that
string$ is not longer than 1 byte.
MKI$ function is the inverse of
CVI. Note, however, that the output of
MKI$ does depend on the current setting of
string$ is 1 byte long, then
CVI(string$) returns the same value as