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我想问一下调用库函数，我哪儿调用错了。竟然一直报错，我能保证的是我的程序没有问题。只是问题发生在这个调用库函数上了。
下面是指令描述： bwtekReadTemperature int bwtekReadTemperature ( int nCommand, int *nADValue, \ AD Value Range: 0 - 4095 double *nTemperature, \ Temperature will be in Celsius int nChannel ); This function is for reading the temperature of the CCD Detector OR read the ambient temperature. nCommand is a flag of specific temperature: 0x10 for CCD detector temperature, 0x11 for ambient temperature reading. *nADValue is a pointer to an integer return value. It is reserved. *nTemperature is a pointer to float pointer value of temperature. The temperature units are degrees Celsius. nChannel is used to address a specific spectrometer device to be operated when multiple spectrometer devices are involved. Users must call the bwtekSetupChannel function to determine which channel numbers are available. A total of 32 spectrometer devices may be connected at one time, where the nChannel value will range from 0 – 31. Default is 0. If only one spectrometer is connected to computer, set nChannel to 0. RETURN If the function call is successful, a positive integer will be returned, else a negative integer will be returned. 我编写的指令 
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_declspec(dllexport) 需要加在c文件的函数声明之前
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