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DECIMAL is used to represent an exact numeric value with a fixed precision and fixed scale.
When vType is set to VT_DECIMAL (0x0000E), the vData1 and vData2 fields of CBaseStorageVariant MUST be interpreted as follows:
vData1: The number of digits to the right of the decimal point. MUST be in the range 0 to 28.
vData2: The sign of the numeric value. Set to 0x00 if positive; set to 0x80 if negative.
When vType is set to VT_DECIMAL, the format of the vValue field is specified in the following diagram.
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1 |
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2 |
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3 |
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wReserved |
scale |
sign |
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Hi32 |
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Lo64 |
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… |
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wReserved (2 bytes): MUST be set to zero and MUST be ignored.
scale (1 byte): The number of decimal places for the number. Valid values are from 0 to 28.
sign (1 byte): Indicates the sign; 0 for positive numbers or DECIMAL_NEG(0x80) for negative numbers.
Hi32 (4 bytes): The high 32 bits of the number.
Lo64 (8 bytes): The low 64 bits of the number.