在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
YR0.m%U,
kwpbg Q 一、实现方法
^$J.l+<hy Ku] <$uo 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
_!E/em d/` d:g #pragma data_seg("shareddata")
T2MXwd&l HHOOK hHook =NULL; //钩子句柄
wO*x0$ UINT nHookCount =0; //挂接的程序数目
b:6e2|xf? static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Ve|=<7%%S static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
~&Y%yN^ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
JcI~8;Z@Z~ static int KeyCount =0;
Zl=IZ?F
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
'FmnlC1 #pragma data_seg()
6kHb*L Je #s|/5[i 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
>I*uo.OF 4[f>kY%[ DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
}FT8[m< :pg]0X; BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
*d,Z?S/ cKey,UCHAR cMask)
FKkL%:? {
iea7*]vW BOOL bAdded=FALSE;
(&-!l2 for(int index=0;index<MAX_KEY;index++){
]s^Pw>/` if(hCallWnd[index]==0){
t,R4q* hCallWnd[index]=hWnd;
Q`[J3-Q*{ HotKey[index]=cKey;
Iq:
G9M HotKeyMask[index]=cMask;
iig@$
i# bAdded=TRUE;
kZH IzU KeyCount++;
Nmu=p~f}3` break;
,~qjL|9 }
tJZ3P@ L }
g7<u eF return bAdded;
#(Ezt% ^ }
{&s.* 5 //删除热键
?M@ff0 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
@N+6qO} {
XiN@$ BOOL bRemoved=FALSE;
3`DwKv`+ for(int index=0;index<MAX_KEY;index++){
x_BnWFP if(hCallWnd[index]==hWnd){
J+0T8
?A if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
dpI! {'"M hCallWnd[index]=NULL;
{qPu}?0 HotKey[index]=0;
9|1J pb HotKeyMask[index]=0;
w]Z:Y` bRemoved=TRUE;
IRB BLXv7\ KeyCount--;
}C9P-- break;
Rkz[x }
szU_,.\ }
ZH8Oidj` }
x"n)y1y return bRemoved;
&{H LYxh }
J:Ncy}AO s2iL5N|"Q @}iY(-V DLL中的钩子函数如下:
B>,&{ah/5J Fd/.\s LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
wA7^ {
%LeZd}v BOOL bProcessed=FALSE;
Jx4"~ 4 if(HC_ACTION==nCode)
%tJ@) {
!O*uQB if((lParam&0xc0000000)==0xc0000000){// 有键松开
xE%sPWbj switch(wParam)
)NL_))\ {
29AWg(9?aS case VK_MENU:
B0eKj=y; MaskBits&=~ALTBIT;
qB44;!( break;
8:)itYE case VK_CONTROL:
eJtfQ@? MaskBits&=~CTRLBIT;
!w=6>B^ break;
y9)Rl)7-: case VK_SHIFT:
$kCLS7 * MaskBits&=~SHIFTBIT;
[nG@
3n break;
oV Hh default: //judge the key and send message
\?rBtD( break;
&WAJ;7f }
%P tdFz$ for(int index=0;index<MAX_KEY;index++){
i2(lqhaP if(hCallWnd[index]==NULL)
$g+q;Y~i0 continue;
;Vh5nO if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
3X
A8\Mg {
^=V b'g3P~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
P
gK> Z, bProcessed=TRUE;
(n3MbVi3LU }
RYem(%jq }
Z/w "zCd }
x;p7n2_ else if((lParam&0xc000ffff)==1){ //有键按下
47
*, switch(wParam)
[Uw/;Kyh {
hj|P*yKV case VK_MENU:
sJq^>"|J MaskBits|=ALTBIT;
RbGq$vYol/ break;
&['cZ/bM case VK_CONTROL:
@Ap~Wok MaskBits|=CTRLBIT;
dpWBY3(7a break;
l/F'W} case VK_SHIFT:
B2DWSp-8* MaskBits|=SHIFTBIT;
K\a=bA}DG break;
8KhE`C9z default: //judge the key and send message
`oUuAL break;
mhZ60 RW }
{Mx3G*hr for(int index=0;index<MAX_KEY;index++){
8O0E;6b if(hCallWnd[index]==NULL)
60r4%>d continue;
=&
.KKr if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[$[1|r
*Q {
^jxV SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`(@}O?w!1 bProcessed=TRUE;
{3{cU#\QA }
c[QXc9 }
%qj8*1 }
X=U >r if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
g<&n V>wF for(int index=0;index<MAX_KEY;index++){
+IpC if(hCallWnd[index]==NULL)
xesZ7{ o continue;
\vQjTM-7 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
v;m}<3@' SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
tjIT4 //lParam的意义可看MSDN中WM_KEYDOWN部分
.uGvmD<;x }
X[Q:c4' }
.*zWm }
]-b`uYb return CallNextHookEx( hHook, nCode, wParam, lParam );
Q7vTTn\ }
cXY;Tw45 mqFo`Ee 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
c
Oi:bC@ ?6=u[))M& BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
rbw5.NU BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
JL1z8Nu ~p0M| 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
bm:"&U*tu' 1>"[b8a/ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
j jLwHJ {
h
&R1" if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
,|r%tNh<8$ {
D#I^;Xg0h //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
u6#=<FD/} SaveBmp();
1!4-M$- return FALSE;
?=\&O=_ln }
5i42o+' …… //其它处理及默认处理
i G%h- }
Cj6+zJ +4Uxq{.K l9"T"9C{ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
8UahoNrSt r%^l~PN 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
Gec? ~dFdO7 二、编程步骤
d}2$J1` ~;#OQ[ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
hhU:
nw s.p4+KJ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
qQ%RnD9 (-:lO{@FsC 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
D;bHX (v'#~ )R_` 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
F^/1 u sD!)= t_ 5、 添加代码,编译运行程序。
eM$NVpS3 #!i& 三、程序代码
+nj
2 3?+CP-T-j ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
6(5YvT #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
knsTy0] #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
c :{#H9 #if _MSC_VER > 1000
_3'FX#xc #pragma once
LW$(;-rY #endif // _MSC_VER > 1000
T|o ]8z #ifndef __AFXWIN_H__
;;#_[Zl #error include 'stdafx.h' before including this file for PCH
nH=8I~jp #endif
R;]z/|8 #include "resource.h" // main symbols
mz'r<v2Tc class CHookApp : public CWinApp
Q2L>P<87T {
EL?6x public:
qZS]eQW. CHookApp();
&O:IRR7p // Overrides
Yi5^#G // ClassWizard generated virtual function overrides
Gz,?e]ZV //{{AFX_VIRTUAL(CHookApp)
eq!>~: # public:
>$RQ virtual BOOL InitInstance();
P d"=&Az| virtual int ExitInstance();
z3bRV{{YqN //}}AFX_VIRTUAL
nN]GO} //{{AFX_MSG(CHookApp)
1j!LK- // NOTE - the ClassWizard will add and remove member functions here.
w I7iE4\vz // DO NOT EDIT what you see in these blocks of generated code !
1_of;=9V //}}AFX_MSG
;tZ;C(;< DECLARE_MESSAGE_MAP()
k"z ~> };
s)L\D$;+O LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
YW2h#PV6_ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
i,B<k 0W9 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
mz|p=[lR| BOOL InitHotkey();
<5 } BOOL UnInit();
2j;9USZ
p #endif
dLfB){>S SaIY-PC //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
3`TD>6rs #include "stdafx.h"
6Vj=SYK #include "hook.h"
bP Q=88* #include <windowsx.h>
vB%os Qm #ifdef _DEBUG
;O7Vl5R #define new DEBUG_NEW
RG.wu6Av #undef THIS_FILE
mKBO<l{S static char THIS_FILE[] = __FILE__;
EeR} 34 #endif
jVPX]8 #define MAX_KEY 100
FyQr$;r #define CTRLBIT 0x04
U,K=(I7OBX #define ALTBIT 0x02
kMx)G] #define SHIFTBIT 0x01
ALQ-aXJ #pragma data_seg("shareddata")
[DZ|Ltv HHOOK hHook =NULL;
cgi:"y F UINT nHookCount =0;
PX*}.L *x static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
63i&< static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
TM5 Y(Q* static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
#g/m^8n?s static int KeyCount =0;
I^Dm 3yz static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
n?778Wo} #pragma data_seg()
$^_6,uBM[ HINSTANCE hins;
^=k=; void VerifyWindow();
8iTB BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
nV`U{}x //{{AFX_MSG_MAP(CHookApp)
#W&o]FAA3y // NOTE - the ClassWizard will add and remove mapping macros here.
$J):yhFs e // DO NOT EDIT what you see in these blocks of generated code!
=I aWf //}}AFX_MSG_MAP
\(RD5@=!4# END_MESSAGE_MAP()
Eq%f`Qg+1E K3Bw3j 9 CHookApp::CHookApp()
@qpj0i+>* {
"BVp37m;? // TODO: add construction code here,
1F_$[iIX] // Place all significant initialization in InitInstance
<F8e?xy }
,5x#o ?;y-skh CHookApp theApp;
0'HQ=pP LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
=Oq*9=v| {
O}w%$ mq BOOL bProcessed=FALSE;
9a @rsyX if(HC_ACTION==nCode)
dr(-k3ex {
Mg2 e0}{ if((lParam&0xc0000000)==0xc0000000){// Key up
i)'tt9f$ switch(wParam)
'$c9 S[ {
e=l:!E10 case VK_MENU:
4i
PVpro MaskBits&=~ALTBIT;
|;7mDhj= break;
:G6aO case VK_CONTROL:
T9I$6HAi MaskBits&=~CTRLBIT;
v3aPHf break;
[}M!ez case VK_SHIFT:
m^0vux MaskBits&=~SHIFTBIT;
@gfW*PNjlP break;
KzP{bK5/ default: //judge the key and send message
} lDX3h break;
S2e3d }
TZ+ p6M8G for(int index=0;index<MAX_KEY;index++){
$~iZ aX8& if(hCallWnd[index]==NULL)
bU}v@Uk continue;
J
jm={+@+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
aG83@ABx {
K2yu}F ^} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
lcm3wJ'w bProcessed=TRUE;
FuBt`H }
?].MnwYo }
#G.eiqh$a }
SDC'S]{ew else if((lParam&0xc000ffff)==1){ //Key down
Y+UJV6 switch(wParam)
vX\9#Hj {
e`s1z|h case VK_MENU:
IJ&Lk=2E] MaskBits|=ALTBIT;
W~0rSVD$<z break;
v@soS1V! case VK_CONTROL:
Sz@z
0' MaskBits|=CTRLBIT;
[B#XA}w break;
Q(]m1\a case VK_SHIFT:
,puoq{ MaskBits|=SHIFTBIT;
-R]0cefC<f break;
v>#Njgo default: //judge the key and send message
zXx/\B$&d* break;
)gEE7Ex? }
U8Zb&6 for(int index=0;index<MAX_KEY;index++)
UuWIT3W>% {
D9[19,2r` if(hCallWnd[index]==NULL)
o6px1C: continue;
hqvhnqQk if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
< j:\;mi; {
}[;ZZm? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
J`U]Ux/L bProcessed=TRUE;
'EiCTl }
7h}gIm7e" }
ZK8)FmT_<O }
LDc EjFK( if(!bProcessed){
tpJA~!mG3 for(int index=0;index<MAX_KEY;index++){
D4L&6[W if(hCallWnd[index]==NULL)
1iF=~@Nz_ continue;
r07u6OA if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
yT7$6x SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
JN
wI{ }
1B;2 ~2X }
$*0-+h }
IJ Jp5[w return CallNextHookEx( hHook, nCode, wParam, lParam );
Vm%G
q }
r!Eh}0bL -pC'C%Q BOOL InitHotkey()
\bARp z?a {
\;&;K'
if(hHook!=NULL){
Pxr/*X nHookCount++;
MJGT|u8O& return TRUE;
0+CcNY9 }
Tx.N#,T| else
9S%5Z> hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
6}6Q:V| if(hHook!=NULL)
O)q4^AE$ nHookCount++;
'ZF6 Z9 return (hHook!=NULL);
Hhknjx }
d0>U-. BOOL UnInit()
lx|Aw@C3~ {
o|@0.H| if(nHookCount>1){
}B-$} nHookCount--;
Ih.+-!w return TRUE;
?\Z pVL<> }
j.&dHtp BOOL unhooked = UnhookWindowsHookEx(hHook);
Q5ASN"_ if(unhooked==TRUE){
e4z~ nHookCount=0;
MqZ"Js hHook=NULL;
_pTcSp3 }
,iyy2 return unhooked;
l SKq }
7>r[.g KCZ<#ca^ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
<{ v
%2 {
[+A]E,pv]1 BOOL bAdded=FALSE;
Qp:m=f6@ for(int index=0;index<MAX_KEY;index++){
bnvY2-O6 if(hCallWnd[index]==0){
*(vh | hCallWnd[index]=hWnd;
oVp/EQ HotKey[index]=cKey;
4|cRYZj5 HotKeyMask[index]=cMask;
$Q'LDmot bAdded=TRUE;
6Xo "?f KeyCount++;
QAo/d4 break;
F}[!OYyg }
~bzac2Rp }
Fo;J3<U) return bAdded;
nW\W<[O9 }
<9xr?i= H*N{4zBB BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
QH7 GEj] {
`?l
/HUw BOOL bRemoved=FALSE;
jd5kkX8= for(int index=0;index<MAX_KEY;index++){
o4yl3o if(hCallWnd[index]==hWnd){
w9"~NK8xzM if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
sEfT#$ a^8 hCallWnd[index]=NULL;
UNv!G/i-5 HotKey[index]=0;
dOaCdnd~ HotKeyMask[index]=0;
e9Gu`$K bRemoved=TRUE;
vy={ziJ KeyCount--;
E|RC|Sz=u break;
[x=(:soEqC }
pH3\X
cn }
e_!Z-#\J% }
726UO#* return bRemoved;
?D9iCP~~ }
pJl/d;Cyrb hc0 $mit void VerifyWindow()
(IjM {
N|"kuRN# for(int i=0;i<MAX_KEY;i++){
~g#/q~UE if(hCallWnd
!=NULL){ IW@phKz
if(!IsWindow(hCallWnd)){ GCw4sb4~w
hCallWnd=NULL; %FqQ+0^
HotKey=0; 8 ?y|
HotKeyMask=0; br k*;
KeyCount--; K]yWpW
} C+`V?rp=s
} *M#L)c;6
} 't*]6^
} ;0?OBUDO
R/E6n &R
BOOL CHookApp::InitInstance() glROT@
{ %`lJA W[
AFX_MANAGE_STATE(AfxGetStaticModuleState()); "8U=0 a
hins=AfxGetInstanceHandle(); =^{MyR7
InitHotkey(); yQ<h>J>
return CWinApp::InitInstance(); <*u^8lCA
} H~Uy/22aQy
fsnZHL}=n
int CHookApp::ExitInstance() Y8lZ]IB
{ /S~ =qodS
VerifyWindow(); [[N${ C
UnInit(); /yY} .S
return CWinApp::ExitInstance(); ?0JNaf
} ;qWSfCt/^
3a ZS1]/
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Y2dml!QM
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _]D
6m2R
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 9^Web~yi#
#if _MSC_VER > 1000 ,PJC FQMR
#pragma once @k'V`ZQF
#endif // _MSC_VER > 1000 I=P<RG7j)
G'dN<Nw6
class CCaptureDlg : public CDialog gnxD'1_
{ CM[83>
// Construction Pq(LW(
public: C"s-ttP
BOOL bTray; N cGFPi(Z
BOOL bRegistered; [>3dhj[;
BOOL RegisterHotkey(); cF9oo%3
UCHAR cKey; CW/L(RQ
UCHAR cMask; 9v3n4=gc
void DeleteIcon(); yA_ly <
void AddIcon(); =
8y,7u)
UINT nCount; ov Xk~%_
void SaveBmp(); Q0x?OL] A
CCaptureDlg(CWnd* pParent = NULL); // standard constructor =d:3]M^
// Dialog Data M_r[wYt!
//{{AFX_DATA(CCaptureDlg) B8.}9
enum { IDD = IDD_CAPTURE_DIALOG }; ZB/1I;l`c
CComboBox m_Key; w&J_c8S
BOOL m_bControl; '}bmDb*
BOOL m_bAlt; QF*cdc<
BOOL m_bShift; Ss\?SEq
CString m_Path; HNj;_S
CString m_Number; Eelv i5
//}}AFX_DATA ssoE ,6kS
// ClassWizard generated virtual function overrides C|3cQ{
//{{AFX_VIRTUAL(CCaptureDlg) $4)L~g|
public: u$(ei2f
virtual BOOL PreTranslateMessage(MSG* pMsg); `s Pk:cNz~
protected: g)|vS>^~
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Vx>Q
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); owVks-/
//}}AFX_VIRTUAL *n[B Bz
// Implementation A:yql`&s
protected: hN]l
$Ct
HICON m_hIcon; Di4GaKa/
// Generated message map functions op9vz[o#4
//{{AFX_MSG(CCaptureDlg) -"i$^Q`
virtual BOOL OnInitDialog(); i^ |G
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $?]`2*i
afx_msg void OnPaint(); 4 dLnX3 v
afx_msg HCURSOR OnQueryDragIcon(); j6XHH&ZEb
virtual void OnCancel(); .y3E@0a
afx_msg void OnAbout(); NqNU:_}
afx_msg void OnBrowse(); Tcc83_Iq
afx_msg void OnChange(); #=33TvprR2
//}}AFX_MSG vTK8t:JQ~
DECLARE_MESSAGE_MAP() jWi~Q o+
}; d
ePk}Sn
#endif RjPkH$u'Pj
oSkQ/5hg.
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file T6=|)UTe1
#include "stdafx.h" g}gGm[1SUo
#include "Capture.h" Q@>1z*'I
#include "CaptureDlg.h" 7
@}`1>97
#include <windowsx.h> Jvsy
6R
#pragma comment(lib,"hook.lib") <g;,or#$
#ifdef _DEBUG &0%Zb~ts
#define new DEBUG_NEW V&vG.HAT
#undef THIS_FILE pUF JQ*
static char THIS_FILE[] = __FILE__; {Bk` Zlki
#endif [MwL=9;!H
#define IDM_SHELL WM_USER+1 0a8\{(w
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); fDplYn#
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V;"2=)X
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A%F8w'8(
class CAboutDlg : public CDialog jQ%1lQ#R)
{ ,pdzi9@=t
public: U]vUa^nG
CAboutDlg(); CLVT5pj='
// Dialog Data vN],9q
//{{AFX_DATA(CAboutDlg) :.]EM*p?GV
enum { IDD = IDD_ABOUTBOX }; RH _b
//}}AFX_DATA L/-SWid)
// ClassWizard generated virtual function overrides vfv?QjR
//{{AFX_VIRTUAL(CAboutDlg)
aY(s
&
protected: Tgtym"=xd
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y,Z$U| U
//}}AFX_VIRTUAL jLI1Ed
// Implementation *P/A&"i[E
protected: \i//Aq
//{{AFX_MSG(CAboutDlg) r/a@ x9
//}}AFX_MSG -bOtF%
DECLARE_MESSAGE_MAP() )^s>2 1
}; P[q>;Fx*
I5l%X{u"N
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ji9o0Y R
{ V'W*'wo
//{{AFX_DATA_INIT(CAboutDlg) \-6y#R-B
//}}AFX_DATA_INIT wUr(i *
} {Hl(t$3V`
+[uh);vD`G
void CAboutDlg::DoDataExchange(CDataExchange* pDX) JcmMbd&B
{ V
)oXJL
CDialog::DoDataExchange(pDX); :6t73\O
//{{AFX_DATA_MAP(CAboutDlg) ^[m-PS(
//}}AFX_DATA_MAP G`0{31us
} w/(T
RxJbQs$Ph
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) db_?da;!`
//{{AFX_MSG_MAP(CAboutDlg) 6IT6EkiT
// No message handlers k`N*_/(|n
//}}AFX_MSG_MAP {[Ri:^nHgL
END_MESSAGE_MAP() b' M"To@
dazML|1ow
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |&WYu,QQ4
: CDialog(CCaptureDlg::IDD, pParent) 9H4"=!AAgD
{ E`^D9:3:)
//{{AFX_DATA_INIT(CCaptureDlg) ~b)X:ku
m_bControl = FALSE; yQj J-g(.
m_bAlt = FALSE; ~Uv#)
m_bShift = FALSE; T>|
hID
m_Path = _T("c:\\"); !\%JOf}
m_Number = _T("0 picture captured."); p7`9
d1n
nCount=0; t6KKfb
bRegistered=FALSE; (9aOET>GG
bTray=FALSE; !=.y[Db=
//}}AFX_DATA_INIT yY UAH-
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 kn>qX{W
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); zsQkI@)sO
} iN'T^+um=
W9c&"T9JT
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) k CGb~+
{ `{Oqb
CDialog::DoDataExchange(pDX); lc5(^~
//{{AFX_DATA_MAP(CCaptureDlg) ~$4(|Fq/
DDX_Control(pDX, IDC_KEY, m_Key); <$A/ ('
DDX_Check(pDX, IDC_CONTROL, m_bControl); WQVU 82b*
DDX_Check(pDX, IDC_ALT, m_bAlt); (_}q>3
DDX_Check(pDX, IDC_SHIFT, m_bShift); RXAE
jzf
DDX_Text(pDX, IDC_PATH, m_Path); =2GKv7q$x,
DDX_Text(pDX, IDC_NUMBER, m_Number); D}!YF~
//}}AFX_DATA_MAP 1:T"jsWw
} |*zgX]-+;
H'!OEZ
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) F^Jz
//{{AFX_MSG_MAP(CCaptureDlg) -WyB2$!(
ON_WM_SYSCOMMAND() ]-#/wC[$l=
ON_WM_PAINT() _8 K|2$X
ON_WM_QUERYDRAGICON() Kzq^f=p
ON_BN_CLICKED(ID_ABOUT, OnAbout) V!]|u ^4I
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0$Mxu7 /
ON_BN_CLICKED(ID_CHANGE, OnChange) {_\dwe9
//}}AFX_MSG_MAP Y}.f&rLe
END_MESSAGE_MAP() .c<U5/
*!`&+w
BOOL CCaptureDlg::OnInitDialog() & }j;SK5
{ Vtj*O'0
CDialog::OnInitDialog(); X~o;jJC
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); v4 rO 0y=C
ASSERT(IDM_ABOUTBOX < 0xF000); =<9Mv+Ry8
CMenu* pSysMenu = GetSystemMenu(FALSE); k-^^Ao*@
if (pSysMenu != NULL) #Cs/.(<
{ 67T.qX2I$
CString strAboutMenu; mz<,nR\
strAboutMenu.LoadString(IDS_ABOUTBOX); d<OdQvW.
if (!strAboutMenu.IsEmpty()) $d-yG553
{ xgNV0;g,
pSysMenu->AppendMenu(MF_SEPARATOR); sEw ?349Bz
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Snmv
} P>~Usuf4
} QRl+7V
SetIcon(m_hIcon, TRUE); // Set big icon Bo
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SetIcon(m_hIcon, FALSE); // Set small icon e9:pS WA-n
m_Key.SetCurSel(0); Bmt8yR2
RegisterHotkey(); ia
/#`#.
CMenu* pMenu=GetSystemMenu(FALSE); `]19}GK~xo
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 5HbJE'
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 9'|k@i:
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); nHXPEbq-g
return TRUE; // return TRUE unless you set the focus to a control o^d|/;
} 7}c[GC)F
0%\fm W j
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^-~=U^2tC
{ 3_
E}XQd
if ((nID & 0xFFF0) == IDM_ABOUTBOX) *j1Skd.#At
{ K'"s9b8
CAboutDlg dlgAbout; :TnU} i_/h
dlgAbout.DoModal(); >U4bK^/Bp
} I~"l9Jc!"
else m\
qR myO
{ 8"ZcK xDk
CDialog::OnSysCommand(nID, lParam); _q@lP|
} yVPFH~1@\
} 3|3ad'
Q3t%JP>;g
void CCaptureDlg::OnPaint() [%Dh0hOg
{ _ qQ
if (IsIconic()) wt_ae|hv
{ O7&OCo|b%>
CPaintDC dc(this); // device context for painting n*|8(fD
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 5(Q-||J
// Center icon in client rectangle !+UXu]kA
int cxIcon = GetSystemMetrics(SM_CXICON); RdpOj >fT
int cyIcon = GetSystemMetrics(SM_CYICON); QqeF
CRect rect; lY[1P|]
GetClientRect(&rect); [a^<2V!vMn
int x = (rect.Width() - cxIcon + 1) / 2; dj 6Lf
int y = (rect.Height() - cyIcon + 1) / 2; ecp0 hG`%
// Draw the icon DAMw(
dc.DrawIcon(x, y, m_hIcon); :2{ [f+
} zRau/1Y0
else $K|2k7
{ [R~@#I P!
CDialog::OnPaint(); N=8CVI
} 3`"k1W
} +fMW B
cZt5;"xgr]
HCURSOR CCaptureDlg::OnQueryDragIcon() ) I.uqG
{ `E>o:tff
return (HCURSOR) m_hIcon; T?-K}PUcQ
} o3OJI_
v&
VOmS>'$
void CCaptureDlg::OnCancel() 7 :u+-U
{ MF::At[4
if(bTray) g-+/zEOUS
DeleteIcon(); %NL7XU[~
CDialog::OnCancel(); 7H[.o~\
} qMBEJ<o
I]d?F:cdX
void CCaptureDlg::OnAbout() (L<G=XC
{ -r{]9v2j
CAboutDlg dlg; 0@#d($'1?Z
dlg.DoModal(); qJj5_
} &gvX<X4e
bgmOX&`G
void CCaptureDlg::OnBrowse() K5d>{c
{ j 2Jew
CString str; d8f S79
BROWSEINFO bi; VDv>I 2%
char name[MAX_PATH]; V ;M'd@
ZeroMemory(&bi,sizeof(BROWSEINFO)); }e,*'mCC*
bi.hwndOwner=GetSafeHwnd(); 2FTJxSC
bi.pszDisplayName=name; k%cT 38V*
bi.lpszTitle="Select folder"; (K>4^E8
bi.ulFlags=BIF_RETURNONLYFSDIRS; #!M;4~Sfx
LPITEMIDLIST idl=SHBrowseForFolder(&bi); `ve5>aw0_Y
if(idl==NULL) )XD$YI
return; g*:f#u5
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); eZRu{`AF*
str.ReleaseBuffer(); |Iq\ZX%q
m_Path=str; lem\P_V)
if(str.GetAt(str.GetLength()-1)!='\\') y8O<_VOO}"
m_Path+="\\"; 32):&X"AIh
UpdateData(FALSE); pd}af iF
} N7qSbiRf<
l,M?
void CCaptureDlg::SaveBmp() EWoGdH|
{ ?bK^IHh
CDC dc; }o#6g|"\sY
dc.CreateDC("DISPLAY",NULL,NULL,NULL); vC!}%sxVw_
CBitmap bm; yi3Cd@t({{
int Width=GetSystemMetrics(SM_CXSCREEN); Zo36jSrCL
int Height=GetSystemMetrics(SM_CYSCREEN); ^T/d34A;SP
bm.CreateCompatibleBitmap(&dc,Width,Height); /*{s1Zcb
CDC tdc; Ea[K$NC)#
tdc.CreateCompatibleDC(&dc); VSa#X |z
CBitmap*pOld=tdc.SelectObject(&bm); pWXoJ0N
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2=xjgK
tdc.SelectObject(pOld); WMd5Y`y
BITMAP btm; veh?oJi@
bm.GetBitmap(&btm); AE 2>smp5@
DWORD size=btm.bmWidthBytes*btm.bmHeight; L+y90 T6?
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &7t3D?K'qX
BITMAPINFOHEADER bih; D>Dch0{H,:
bih.biBitCount=btm.bmBitsPixel; 3 ]}wZY0
bih.biClrImportant=0; 0SLS;s.GX
bih.biClrUsed=0; t#6@~49
bih.biCompression=0; oefhJM!y
bih.biHeight=btm.bmHeight; \>*B
bih.biPlanes=1; k~ZE4^dM
bih.biSize=sizeof(BITMAPINFOHEADER); [1{uK&$e
bih.biSizeImage=size; V8.o}BWY
bih.biWidth=btm.bmWidth; H$i4OQ2
bih.biXPelsPerMeter=0; "]C$"JR
bih.biYPelsPerMeter=0; UFy"hJchO
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {
'Db
static int filecount=0; u*J,3o}
<
CString name; 4=E9$.3a
name.Format("pict%04d.bmp",filecount++); Wp<4F6C$@
name=m_Path+name; .A`Q!
BITMAPFILEHEADER bfh; R4Vi*H
bfh.bfReserved1=bfh.bfReserved2=0; ?tLBEoUmKT
bfh.bfType=((WORD)('M'<< 8)|'B'); 'X$2gD3c9
bfh.bfSize=54+size; hI{M?LQd
bfh.bfOffBits=54; :Ojsj_Z;;
CFile bf; ({}JvSn1
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ s<t*g]0`/
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ')Drv)L
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ^%V^\DK
bf.WriteHuge(lpData,size); vf+GC*f
bf.Close(); l|c#
nCount++; *uq;O*s
} -5~&A6+ILn
GlobalFreePtr(lpData); U!rhj&n
if(nCount==1) 7LM?<lp]
m_Number.Format("%d picture captured.",nCount); _S[@d^cY
else INFbj8T
m_Number.Format("%d pictures captured.",nCount); kCWaji_x%
UpdateData(FALSE); XUrxnJ4
} n.{Ud\|
yrnIQu*Uu
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) G G]4g)O5
{ 1I*b7t
if(pMsg -> message == WM_KEYDOWN) E{m\LUd^
:
{ ',o ,o%n
if(pMsg -> wParam == VK_ESCAPE) 3(De> gs$
return TRUE; H]7MN Y
if(pMsg -> wParam == VK_RETURN) cg-\|H1
return TRUE; =N5~iMorD-
} brk>oM;t
return CDialog::PreTranslateMessage(pMsg); 2cy: l03
} hP1H/=~
Gy+/P6
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dy^Zlu`
f
{ p,hDZea
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ &QaFX,N"
SaveBmp(); BM_hW8&G
return FALSE; {=5Wi|
} {G:dhi
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Sl,\<a
CMenu pop; \J>a*
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); BB&7VSgc-
CMenu*pMenu=pop.GetSubMenu(0); umt*;U=
pMenu->SetDefaultItem(ID_EXITICON); 6 XZF8W
CPoint pt; ev}lb+pr)_
GetCursorPos(&pt); KiXRBFo
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Z%]s+V)st
if(id==ID_EXITICON) osS?SuQT E
DeleteIcon(); |~'PEY
else if(id==ID_EXIT) Ifghyh<d
OnCancel(); #bz#&vt$
return FALSE; _O76Aw-@l
} llbf(!
LRESULT res= CDialog::WindowProc(message, wParam, lParam); i(hI\hD
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ^EK]z8;|
AddIcon(); &LRO^[d
return res; S?ypka"L
} ~J:cod
=Oo=&vA.oc
void CCaptureDlg::AddIcon() /i'dhiG
{ |\PI"rW
NOTIFYICONDATA data; op\'T;xIu
data.cbSize=sizeof(NOTIFYICONDATA); `eD70h`XK
CString tip; xc4g`Xi
tip.LoadString(IDS_ICONTIP); eXB'>#&s
data.hIcon=GetIcon(0); sqtMhUQ?>w
data.hWnd=GetSafeHwnd(); k/6Qwb#
strcpy(data.szTip,tip); U3R;'80 f
data.uCallbackMessage=IDM_SHELL; TuF;>{~}
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; g4Y1*`}2f
data.uID=98; Oz3JMZe
Shell_NotifyIcon(NIM_ADD,&data); ""0 cw
ShowWindow(SW_HIDE); _,,w>q6K
bTray=TRUE; [{}Hk%wlX
} 6ol*$Q"z
aYJTSgW
void CCaptureDlg::DeleteIcon() ,~z*V;y)
{ 9L2]PU
v
NOTIFYICONDATA data; <_o).hE{
data.cbSize=sizeof(NOTIFYICONDATA); oGtz*AP%
data.hWnd=GetSafeHwnd(); 25NTtj:X
data.uID=98; V8Lp%*(3
Shell_NotifyIcon(NIM_DELETE,&data); 3FD6.X>x
ShowWindow(SW_SHOW); h83W;s
SetForegroundWindow(); xaPaK-
ShowWindow(SW_SHOWNORMAL); [:CV5k~xc
bTray=FALSE; e7n[NVrX
} QfdATK P
CXI%8eFXe$
void CCaptureDlg::OnChange() E.Vlz^B
{ \LN!k-c
RegisterHotkey(); (uW$ch@2K
} >/BMA;`
TJ_<21a
BOOL CCaptureDlg::RegisterHotkey() sz"N,-<Ig
{ d~0k}|>
UpdateData(); f/?uosS
UCHAR mask=0; n'5LY9"
UCHAR key=0; >'Nrvy%&0
if(m_bControl) fCZbIt)Eh
mask|=4; kvSSz%R~
if(m_bAlt) R^dAwt`.D
mask|=2; [ OMcSd|nf
if(m_bShift) ;wDcYs
mask|=1; I2|iqbX40Q
key=Key_Table[m_Key.GetCurSel()]; 'fcJ]%-=
if(bRegistered){ rtf>\j+
DeleteHotkey(GetSafeHwnd(),cKey,cMask); u&bo32fc
bRegistered=FALSE; "v jFL9
} _V6;`{$WK
cMask=mask; ^b;.zhp8;N
cKey=key; VILzx+v
M
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5`6@CRef
return bRegistered; &^qD<eZ!Eq
} &{y-}[~
QS_"fsyN:
四、小结 <J {VTk ~
wvJm)Mj+
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。