CVI显性调用VC生成的DLL.doc

CVI显性调用VC生成的DLL的详细步骤及注意事项2017/4/16 Create by 狄阁老If you have any question ,please mailto：关键字：CVI，VC+6.0 ,动态链接库DLL，CVI显性调用VC+6.0生成的DLL最近在忙于用Labwindows/CVI实现某种功能,需要用利用VC+6.0环境开发的dll,然后供Labwindows/CVI调用。详细步骤如下：步骤1，打开VC+6.0环境，文件-新建-选择Win32 Dynamic-Link Library ,输入工程名，例如test04,见图1；图1, 步骤1步骤2，点击确定，选择一个“一个可以导出某些符号的DLL工程”，如图2，点击完成，出现一个确定界面，点击界面上的确定按钮，图2 步骤2步骤3，清除test04.cpp中的默认代码（红色），再在test04.h中清除默认的定义（绿色）/ This is an example of an exported variableTEST04_API int nTest04=0;/ This is an example of an exported function.TEST04_API int fnTest04(void)return 42;/ This is the constructor of a class that has been exported./ see test04.h for the class definitionCTest04:CTest04() return; / This class is exported from the test04.dllclass TEST04_API CTest04 public:CTest04(void);/ TODO: add your methods here.;extern TEST04_API int nTest04;TEST04_API int fnTest04(void);步骤4，在test04.cpp中添加自己的函数，例如：TEST04_API int add(int x,int y) return x+y;TEST04_API int maxvalue(int x,int y) if(xy) return x; else return y;TEST04_API float sub(float x,float y) return x-y;TEST04_API void hello(void)MessageBox (0, LabWindowsCVI调用dll成功n, 欢迎, MB_ICONINFORMATION);TEST04_API char * returnstr(const char * s1, const char * s2)int m1,m2; /两字符串长度m1=strlen(s1); m2=strlen(s2); /求长度char * s=(char *)malloc(sizeof(char)*(m1+m2+1); /申请内存空间，多1字节strcpy(s,s1); /复制第一个字符串strcpy(s+m1,s2); /复制第二个字符串return s; /返回结果步骤5，在test04.h添加定义TEST04_API int add(int x,int y);TEST04_API int maxvalue(int x,int y);TEST04_API float sub(float x,float y);TEST04_API void hello(void);TEST04_API char * returnstr(const char * s1, const char * s2);步骤6，最重要的一步，需要添加.def文件在工程路径下新建一个.txt文本，在里面添加如下内容（红色），见图3；LIBRARY testmydll /引号内的随便写 EXPORTS add maxvaluesubhelloreturnstr图3 步骤6步骤7，将.def添加到工程中，见图4；图4 步骤7步骤8，然后在工程下debug下找到test04.dll拷贝到CVI工程下，CVI工程代码如下：/=/ Title: testDLL/ Purpose: A short description of the application./ Created on: 2017/4/15 at 20:20:28 by digelao./ Copyright: . All Rights Reserved./=/=/ Include files#include #include #include #include #include testDLL.h#include toolbox.h/=/ Constants/=/ Types/=/ Static global variablesstatic int panelHandle;HINSTANCE hDll;/句柄 typedef int (*myfuction)(int,int);myfuction mf=NULL;typedef void (*hello)(void);hello hl=NULL;typedef char* (*returnstr)(const char *,const char *);returnstr rs=NULL;typedef int (*maxvalue)(int,int);maxvalue mx=NULL;typedef float (*sub)(float,float);sub sb=NULL;/=/ Static functions/=/ Global variables/=/ Global functions/ HIFN The main entry-point main (int argc, char *argv) int error = 0; /* initialize and load resources */ nullChk (InitCVIRTE (0, argv, 0); errChk (panelHandle = LoadPanel (0, testDLL.uir, PANEL);/以下至 /* display the panel and run the user interface */之间是加载dll中的函数hDll=LoadLibrary(test04.dll);/动态加载DLL模块句柄mf=(myfuction) GetProcAddress(hDll,add);/得到所加载DLL模块中函数的地址if(mf=NULL)MessagePopup (, 调用函数add失败！);hl=(hello) GetProcAddress(hDll,hello);/得到所加载DLL模块中函数的地址if(hl=NULL)MessagePopup (, 调用函数hello失败！);rs=(returnstr) GetProcAddress(hDll,returnstr);/得到所加载DLL模块中函数的地址if(rs=NULL)MessagePopup (, 调用函数returnstr失败！);mx=(maxvalue) GetProcAddress(hDll,maxvalue);/得到所加载DLL模块中函数的地址if(mx=NULL)MessagePopup (, 调用函数maxvalue失败！);sb=(sub) GetProcAddress(hDll,sub);/得到所加载DLL模块中函数的地址if(mx=NULL) MessagePopup (, 调用函数sub失败！); /* display the panel and run the user interface */errChk (DisplayPanel (panelHandle);errChk (RunUserInterface ();Error: /* clean up */ DiscardPanel (panelHandle); return 0;/=/ UI callback function prototypes/ HIFN Exit when the user dismisses the CVICALLBACK panelCB (int panel, int event, void *callbackData, int eventData1, int eventData2) if (event = EVENT_CLOSE) QuitUserInterface (0); return 0;int CVICALLBACK OkCallback (int panel, int control, int event,void *callbackData, int eventData1, int eventData2)int m=0;float tmp=0;char str1000;switch (event)case EVENT_COMMIT: /SetWaitCursor (0); m=mf(100,9000);/调用add函数SetCtrlVal (panelHandle, PANEL_NUMERIC, m);/Delay(1);hl();/调用hello函数strcpy(str,rs(fml,dyp);/调用returnstr函数returnstrSetCtrlVal (panelHandle, PANEL_TEXTMSG, str);m=mx(5,15); /调用maxvalue函数SetCtrlVal (panelHandle, PANEL_NUMERIC, m); tmp