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发信人: xian (我想用心来点亮希望), 信区: Linux
标  题: Linux程式设计入门-gpm
发信站: 紫 丁 香 (Sun May  2 16:29:24 1999), 转信


网络工作室--知识库:编程技术:Unix编程:Linux程式设计入门:
Linux程式设计入门-gpm
Linux程式设计入门-gpm



gpm是Linuxconsole下的滑鼠驱动程式，它主要提供文字模式下的滑鼠事件处

理。Linux下文字界面的滑鼠几乎都是用gpm来处理。


gpm的文件在gpm原始码的doc目录中，详细的说明可叁考该目录中的文件gpm

programmingguide，此处只提供给您KickStart的一些技巧及一些叁考说明。


特别注意到以下的范例，需在console下执行，不可在XWindow的Terminal下

执行。



范例:gpm_mouse.c


gpm原始码中有一个mev.c的程式，主要用来测试滑鼠状态。事实上，mev.c是个

很好的范例，本范例便是取自mev.c，经过简化修改而来。


#include<stdio.h>

#include<stdlib.h>

#include<unistd.h>

#include<gpm.h>


voidmain(intargc,char**argv)

{

fd_setreadset;

Gpm_Eventevent;

Gpm_Connectconn;


conn.eventMask=~0;

conn.defaultMask=~GPM_HARD;

conn.maxMod=0;

conn.minMod=0;


if(Gpm_Open(&conn,0)==-1){

printf("Cannotopenmouseconnection\n");

exit(1);

}


while(1){


FD_ZERO(&readset);

FD_SET(gpm_fd,&readset);

select(gpm_fd+1,&readset,0,0,0);


if(FD_ISSET(gpm_fd,&readset)){

if(Gpm_GetEvent(&event)>0){

printf("mouse:event0x%02X,at%2i%2i(delta%2i%2i),"

"button%i,modifiers0x%02X\r\n",

event.type,

event.x,event.y,

event.dx,event.dy,

event.buttons,

event.modifiers

);

}

}

}


while(Gpm_Close());


}


编译


gcc-ogpm_mousegpm_mouse.c-lgpm


检验结果


mouse:event0x01,at151(delta-2-1),button0,modifiers0x00

mouse:event0x01,at141(delta-10),button0,modifiers0x00

mouse:event0x01,at131(delta-10),button0,modifiers0x00



资料结构


typedefstructGpm_Connect{

unsignedshorteventMask,defaultMask;

unsignedshortminMod,maxMod;

intpid;

intvc;

}Gpm_Connect;


enumGpm_Etype{

GPM_MOVE=1,

GPM_DRAG=2,/*exactlyoneofthebareonesisactiveatatime

*/

GPM_DOWN=4,

GPM_UP=8,


GPM_SINGLE=16,/*atmostoneinthreeisset*/

GPM_DOUBLE=32,

GPM_TRIPLE=64,/*WARNING:Idependonthevalues*/


GPM_MFLAG=128,/*motionduringclick?*/

GPM_HARD=256,/*ifsetinthedefaultMask,forcean

alreadyusedeventtopassovertoanotherhandler*/


GPM_ENTER=512,/*enterevent,userinRoi's*/

GPM_LEAVE=1024/*leaveevent,usedinRoi's*/

};


typedefstructGpm_Event{

unsignedcharbuttons,modifiers;/*trytobeamultipleof4*/

unsignedshortvc;

shortdx,dy,x,y;

enumGpm_Etypetype;

intclicks;

enumGpm_Marginmargin;

}Gpm_Event;


typedefintGpm_Handler(Gpm_Event*event,void*clientdata);


函数宣告


intGpm_Open(Gpm_Connect*CONN,intFLAGS);

intGpm_Close(void);

intGpm_GetEvent(Gpm_Event*EVENT);

intGpm_Getc(FILE*fp);

#defineGpm_Getchar()Gpm_Getc(stdin)

intGpm_Wgetch();

#defineGpm_Getch()(Gpm_Wgetch(NULL))

intGpm_Repeat(intmillisecs);

intGpm_DrawPointer(intX,intY,intFD);

intGPM_DRAWPOINTER(Gpm_Event*EPTR;)

intGpm_FitValuesM(int*X,int*Y,intMARGIN);

intGpm_FitValues(X,Y);

Gpm_FitEvent(EPTR);

char*Gpm_GetLibVersion(int*where);

char*Gpm_GetServerVersion(int*where);

intGpm_GetSnapshot(Gpm_Event*ePtr);



OKSTATION,Webmaster,BrianLin

admin@studio.openunix.org



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