用vc++编程时出现以下错误是什么原因?
电压图像Dlg.obj : error LNK2001: unresolved external symbol "int __stdcall SppOut(float,int,int,float,float,char)" (?SppOut@@YGHMHHMMD@Z)
Debug/电压图像.exe : fatal error LNK1120: 1 unresolved externals
电压图像Dlg.obj : error LNK2001: unresolved external symbol "int __stdcall SppOut(float,int,int,float,float,char)" (?SppOut@@YGHMHHMMD@Z)
Debug/电压图像.exe : fatal error LNK1120: 1 unresolved externals
1。对SppOut只声明了,没定义,增加上定义
2。函数SppOut在别的dll中,需要增加上函数SppOut所在dll对应的lib库