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:
rsa&Oo
D> .]Mn^2#j 一、实现方法
u1K\@jlw p2x [p 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:
^+?|Qfi "Mmf6hu #pragma data_seg("shareddata")
OuIv e>8 HHOOK hHook =NULL; //钩子句柄
K
X]oE+: UINT nHookCount =0; //挂接的程序数目
oQ+61!5> static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
f"&Xr!b.h static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
`0#H]=$2h static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
N<z`yV static int KeyCount =0;
kpob b static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
[6(Iwz? #pragma data_seg()
@{Py % JhR W[~ 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。
$M"0BZQ?y! Sav`%0q?7a DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
G5]1s 8V4V3^_xs BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
;7G_f cKey,UCHAR cMask)
-.vDF?@G {
m$y]Lf BOOL bAdded=FALSE;
&:?e & for(int index=0;index<MAX_KEY;index++){
n+2J Dq|?p if(hCallWnd[index]==0){
6*1$8G`$8, hCallWnd[index]=hWnd;
w.kCBDL HotKey[index]=cKey;
2f:Mm'XdB HotKeyMask[index]=cMask;
)wf\F6jN bAdded=TRUE;
;MTz]c KeyCount++;
wFlV=!>, break;
dU;upS_- }
H)JS0
G0 }
E;-qP)yU return bAdded;
w;`m- 9<Y }
hH+bt!aH //删除热键
I
8Y*@$h BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
<lFY7'aY {
dhR(_ BOOL bRemoved=FALSE;
Z}cIA87U for(int index=0;index<MAX_KEY;index++){
rH}fLu8,;Q if(hCallWnd[index]==hWnd){
MguL$W&l if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
rpU/s@%L hCallWnd[index]=NULL;
z<a2cQ?XQ HotKey[index]=0;
-0~IY HotKeyMask[index]=0;
N
<pbO#e bRemoved=TRUE;
lpEDPvD_Vm KeyCount--;
P79R~m` break;
]O@"\_} }
\5[-Ml }
<NQyP{p }
?f2G?Y return bRemoved;
cCng5Nq,c }
lYQtv=q +J40wFI:y :Ee ?K DLL中的钩子函数如下:
r>3^kL5UI {,V$* LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
iK x+6v {
vw
rRZ"2 BOOL bProcessed=FALSE;
Gc5VQ^] if(HC_ACTION==nCode)
uZ[/%GTX{) {
6D*chvNA; if((lParam&0xc0000000)==0xc0000000){// 有键松开
+L6" vkz switch(wParam)
UA0tFeH {
|9]PtgQv7 case VK_MENU:
]GS~i+ =M MaskBits&=~ALTBIT;
^uBwj}6 break;
Qu_EfmN| case VK_CONTROL:
?cBO6^ MaskBits&=~CTRLBIT;
F^sw0 .b break;
P7>IZ >bw case VK_SHIFT:
4I.1D2 1jA MaskBits&=~SHIFTBIT;
T:#S86m break;
6<76O~hNZ default: //judge the key and send message
z+6QZQk break;
5vGioO }
:C}H y for(int index=0;index<MAX_KEY;index++){
nhT;b,G.Z if(hCallWnd[index]==NULL)
o>K &D$J;O continue;
C*j9Iaj if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
HwW6tQ {
GXEcpc08 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
f#mx:Q.7I bProcessed=TRUE;
}MjQP R }
)[ w&C_>] }
r:#Q9EA }
. z].:$J& else if((lParam&0xc000ffff)==1){ //有键按下
|<2
*v-a switch(wParam)
|Pf(J;'[ {
/.2u.G case VK_MENU:
Z*h ;e; MaskBits|=ALTBIT;
y*(_\\ break;
xtsL8-u f case VK_CONTROL:
?+Hp?i$1 MaskBits|=CTRLBIT;
Za9$Hh/X break;
U%n,XOJ case VK_SHIFT:
|I/,F;' MaskBits|=SHIFTBIT;
;fkSrdj break;
a.CF9m5]c default: //judge the key and send message
#hZQ>zcF break;
qlEFJ5; }
>.LgsMRIKi for(int index=0;index<MAX_KEY;index++){
,y%ziay if(hCallWnd[index]==NULL)
hLSTSD} continue;
u'=(&>< if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
P!9;} & {
KZW'O
b>[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
8T<@ @6`T bProcessed=TRUE;
y]<#%Fh }
/'mrDb_ip }
:TlAL#
s& }
HIsB| if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
[jy0@Q9 for(int index=0;index<MAX_KEY;index++){
zw,-.fmM# if(hCallWnd[index]==NULL)
/Ht/F)&P continue;
"I@v&(Am; if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
xl3zy~;M SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
q;ZLaX\bFl //lParam的意义可看MSDN中WM_KEYDOWN部分
>6IXuq }
.<HC[ls }
T0YDfo }
UKOFT6| return CallNextHookEx( hHook, nCode, wParam, lParam );
K]ca4Z }
M5F(<,n; ,%[LwmET 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:
@W#fui<<}Y |.Em_*VG BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
wKGogf[(% BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
IX"ZS (1rJFl! 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:
G l_\Vy Q
js2hj-$ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
IKGTsA; {
D DQs42[ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
OI*ZVD)J {
\QliHm! //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
7Pwg+| SaveBmp();
l<W*/}3 return FALSE;
.N/GfR`0/< }
ax4*xxU …… //其它处理及默认处理
U@#?T }
7AI3|Ts]p Ir!2^:]! P87ld._ 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。
&S<?07Z y!SF/i?Py 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。
=Na/3\^WP V_Xy2<V 二、编程步骤
kNRyOUy Z"-ntx# 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";
('T4Db PP!l 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
^I@ey*$ $[j-C9W 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
Yr5iZ~V$ +d@v
AxP 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;
Hr
/W6C {-o7w0d_ 5、 添加代码,编译运行程序。
TG4\%S$w m
&9)'o 三、程序代码
MhHr*!N"} /z/hUa ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
A
*a{ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
tceIA8d6
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
6 lN?) <uQ #if _MSC_VER > 1000
l{nB.m2 #pragma once
^Yf3"D?& #endif // _MSC_VER > 1000
#D/$6ah~m #ifndef __AFXWIN_H__
-zPm{a #error include 'stdafx.h' before including this file for PCH
g!p+rq_f #endif
Tq9,c#}& #include "resource.h" // main symbols
^:qpa5^" class CHookApp : public CWinApp
:[A?A4l {
Tf9&,!>V public:
PXOrOK CHookApp();
M7`UoTc+>d // Overrides
dD[v=Z_ // ClassWizard generated virtual function overrides
uOyLC<I/ //{{AFX_VIRTUAL(CHookApp)
K{,
W_^ public:
/Lq;w'|I virtual BOOL InitInstance();
}W - K virtual int ExitInstance();
Z|]l"W*w //}}AFX_VIRTUAL
[P.@1mV //{{AFX_MSG(CHookApp)
r$b:1 C~ // NOTE - the ClassWizard will add and remove member functions here.
z2rQ$O-# // DO NOT EDIT what you see in these blocks of generated code !
zzulVj* //}}AFX_MSG
:`{9x%o; DECLARE_MESSAGE_MAP()
B=Xnv*e };
N5:D8oWWXR LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
#B}BI8o ( BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
^?H\*N4 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
1h#w"4 BOOL InitHotkey();
],BJ}~v,X BOOL UnInit();
#gxRTx #endif
o%kSR ]V| /AK*aRU^ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
u+%)JhIp #include "stdafx.h"
2N6Pa(6 #include "hook.h"
x(C]O, #include <windowsx.h>
]3gYuz| #ifdef _DEBUG
nG&w0de<> #define new DEBUG_NEW
X;K8,A7` #undef THIS_FILE
R*JOiVAC static char THIS_FILE[] = __FILE__;
2jI4V;H8g #endif
/ChJ~g " #define MAX_KEY 100
OlD7-c2L] #define CTRLBIT 0x04
eLHa9R{)B #define ALTBIT 0x02
wZ
(uq?3S` #define SHIFTBIT 0x01
9b{g+lMZo #pragma data_seg("shareddata")
#J%h!#3g HHOOK hHook =NULL;
`~w%Jf UINT nHookCount =0;
cHqvkN` static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
\GjXsR*b5 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
rwi2kk#@P static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
#Pe\Z/ static int KeyCount =0;
?RrC~7~ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
kMwIuy #pragma data_seg()
^L*VW
gi9 HINSTANCE hins;
1A,4Aw< void VerifyWindow();
-9tXv+v? BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
SdEb[ //{{AFX_MSG_MAP(CHookApp)
A-AN6. // NOTE - the ClassWizard will add and remove mapping macros here.
1s^$oi} // DO NOT EDIT what you see in these blocks of generated code!
x| ~D(zo //}}AFX_MSG_MAP
EkfGw/WDw END_MESSAGE_MAP()
a$+e8> ;X9MA=b CHookApp::CHookApp()
O"2wV +9 {
N#2nH1C // TODO: add construction code here,
e+]YCp[( // Place all significant initialization in InitInstance
"6[Ax{cM }
d-A%ZAkE] OTy4"% CHookApp theApp;
h!JjN$ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Y/:Q|HnXQ {
_If@#WnoyA BOOL bProcessed=FALSE;
nvUkbmZG# if(HC_ACTION==nCode)
%r}KvJgd {
S+e-b'++? if((lParam&0xc0000000)==0xc0000000){// Key up
'%JMnU switch(wParam)
lHj7O&+ {
BT*K,p case VK_MENU:
hQW#a]]V: MaskBits&=~ALTBIT;
HzO0K=Z=R0 break;
-mWw.SfEZ case VK_CONTROL:
K{[Fa,]' MaskBits&=~CTRLBIT;
SqT"/e]b' break;
'Rar>oU case VK_SHIFT:
01SFOPuR%( MaskBits&=~SHIFTBIT;
#L1yL<' break;
0,i+ default: //judge the key and send message
7UEy L
}N break;
iM-hWhU }
>f9]Nj for(int index=0;index<MAX_KEY;index++){
G){1`gAhNJ if(hCallWnd[index]==NULL)
d+$[EDix continue;
5xn0U5U if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
qz_TcU' {
Q:xI}
]FM SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
f*R_\ bProcessed=TRUE;
^!s}2GcS` }
4VL!U?dk }
a1Y _0 }
<3]/ms else if((lParam&0xc000ffff)==1){ //Key down
*dn-,Q%` switch(wParam)
)F9%^a( {
!z&seG]@ case VK_MENU:
f~(^|~ZT MaskBits|=ALTBIT;
0aq-drl5\ break;
mm9S#Ya case VK_CONTROL:
(^OC%pc MaskBits|=CTRLBIT;
'5+, lRu break;
q~A|R case VK_SHIFT:
0z2R`=) MaskBits|=SHIFTBIT;
u+i/CE#w break;
Yv`1ySR default: //judge the key and send message
9?mOLDu}Q0 break;
$EHn;~w T }
'&L
for(int index=0;index<MAX_KEY;index++)
j2&OYg {
/URj$| if(hCallWnd[index]==NULL)
ovRCF(Og, continue;
?9.? w-Q' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*{n,4d\.. {
u*YuU%H= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Y(;[L`" bProcessed=TRUE;
%L,, }
tYxlM! }
a*ixs'MJ }
U},W/g- if(!bProcessed){
Iw-6Z+ 94 for(int index=0;index<MAX_KEY;index++){
&[\arwe) if(hCallWnd[index]==NULL)
dL Py%q continue;
kJ:5msKwC if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
:zk.^q SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
O9 r44ww }
J'&?=| }
m`w6wz }
/? <9,7#i return CallNextHookEx( hHook, nCode, wParam, lParam );
iO#xIl< }
Czl 8Q oH )9P BOOL InitHotkey()
9#ay(g {
@!tmUme1c if(hHook!=NULL){
,wy:RVv@e nHookCount++;
w@D@,q'x return TRUE;
:=KGQ3V~eK }
FP
cvkXQD else
2yg'?tpj hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
]7ZC>.t
if(hHook!=NULL)
.oOt(K+ nHookCount++;
_-nN(
${{ return (hHook!=NULL);
nFOG=>c} }
m<;" 1<k BOOL UnInit()
LA(JA {
x~I1(l7r if(nHookCount>1){
' <jp.sZQ nHookCount--;
-CNv=vj 3 return TRUE;
Hqy>!1! }
&~6O;}\ BOOL unhooked = UnhookWindowsHookEx(hHook);
l`G:@}P>G if(unhooked==TRUE){
gM:oP. nHookCount=0;
y3$\ m hHook=NULL;
%Y[/Ucdm }
lY8Qy2k| return unhooked;
eHZl-|- }
x=<>%m5R ",oUVl BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
3m9E2R, {
biuo.OG] BOOL bAdded=FALSE;
h*'5h! for(int index=0;index<MAX_KEY;index++){
|iThgq_\z if(hCallWnd[index]==0){
Y\F H4}\S hCallWnd[index]=hWnd;
?-p aM5Q+ HotKey[index]=cKey;
))zaL2UP. HotKeyMask[index]=cMask;
745PCC'FK bAdded=TRUE;
,S K6*tpI KeyCount++;
6@361f[ break;
e=$xn3)McY }
h(K4AiGE }
D($UbT-v return bAdded;
66;O 3g' }
M& L0n%,y5 `{[C4]Ew/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-B! TA0=oJ {
dXN&<Q, BOOL bRemoved=FALSE;
;0{*V5A for(int index=0;index<MAX_KEY;index++){
oMf h|B if(hCallWnd[index]==hWnd){
JH,+F if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
@AyW9!vV;3 hCallWnd[index]=NULL;
V,,iKr@TG HotKey[index]=0;
Jk{2!uP HotKeyMask[index]=0;
'v5gg2 bRemoved=TRUE;
S'fq/`2g6 KeyCount--;
{[iQRYD0| break;
!7|9r$ }
P_%l}% }
g#NUo/ }
T!$HVHh&,} return bRemoved;
$^GnY7$!> }
WJ,ON-v 9&jNdB void VerifyWindow()
gW%(_H mX {
o?\Pw9Y for(int i=0;i<MAX_KEY;i++){
fQ) ;+ if(hCallWnd
!=NULL){ cE?J]5#^
if(!IsWindow(hCallWnd)){ fR{7780WZ
hCallWnd=NULL; epe}^Pl
HotKey=0; oZw#Nd
HotKeyMask=0; yIP
IA%dJ
KeyCount--; %oQj^r!Xd
} m#P&Yd4T
} :a`m9s 4
} }3e+D
} R'U(]&e.j
4Yk(ldR~
BOOL CHookApp::InitInstance() *8+YR
{ wVX0!y6
AFX_MANAGE_STATE(AfxGetStaticModuleState()); h<q``hn>
hins=AfxGetInstanceHandle(); AG%aH=TKp
InitHotkey(); }2"k:-g
return CWinApp::InitInstance(); l1-FL-1
} ggWfk
r6<}S(
int CHookApp::ExitInstance() m5*RB1
{ A5\S0l$Q
VerifyWindow(); GW#Wy=(_
UnInit(); X+jSB,
return CWinApp::ExitInstance(); :}-[%LSV
} [)?3Dp|MH
"a7d`l:
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 4B
6Aw?
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ce\-oT
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ &,xM;8b
#if _MSC_VER > 1000 Ek6W:Q:@
#pragma once Dc2eY.
#endif // _MSC_VER > 1000 oB@C-(M
{,ljIhc,
class CCaptureDlg : public CDialog jXQ_7
{ u ""=9>0
// Construction 0v?,:]A0E
public: "-oC,;yq
BOOL bTray; 7+bzCDKU
BOOL bRegistered; dLq!t@?iu>
BOOL RegisterHotkey(); OWzIea@
UCHAR cKey; OZD/t(4?6s
UCHAR cMask; J^T66}r[f,
void DeleteIcon(); kaLRI|hC
void AddIcon(); Y|L57F
UINT nCount; YDwns
void SaveBmp(); ~czt=
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Nx"?'-3Hm
// Dialog Data 4$rO,W/&0
//{{AFX_DATA(CCaptureDlg) 'n=D$j]X
enum { IDD = IDD_CAPTURE_DIALOG }; '1+ Bgf
CComboBox m_Key; l;ugrAo?
BOOL m_bControl; >JhQ=j
BOOL m_bAlt; ORO~(%-(e
BOOL m_bShift; N
Jf''e3
CString m_Path; IM+PjYJ
CString m_Number; N'StT$(
//}}AFX_DATA 6=FuH@Q&
// ClassWizard generated virtual function overrides h?b{{
//{{AFX_VIRTUAL(CCaptureDlg) ,3K?=e2
public: u|C9[(
virtual BOOL PreTranslateMessage(MSG* pMsg); MD,-<X)Qy
protected: ]KmYPrCl0
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DbDpdC;
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); z{ 8!3>:E
//}}AFX_VIRTUAL Ni`qU(I'|
// Implementation `'/8ifKz
protected: b#F3,T__`Y
HICON m_hIcon; VC@o]t5
// Generated message map functions @AwH?7(b
//{{AFX_MSG(CCaptureDlg) AQ&;y&+QR
virtual BOOL OnInitDialog(); t9kgACo/M
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); E4{8 $:q=
afx_msg void OnPaint(); 'oTF$3n
afx_msg HCURSOR OnQueryDragIcon(); V\_
&2',t
virtual void OnCancel(); m{g{"=}YR
afx_msg void OnAbout(); SFjN5u
afx_msg void OnBrowse(); W<2-Q,>Y
afx_msg void OnChange(); \<5xf<{
//}}AFX_MSG 8L#sg^1V
DECLARE_MESSAGE_MAP() +$%o#~
}; w/UsEIr
#endif )9*WmF c+#
}*%%GPJ
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^^v!..V]J
#include "stdafx.h" \Tc$P#
#include "Capture.h" *+ 7#z;
#include "CaptureDlg.h" /q=<OEC
#include <windowsx.h> M*x_1h5n
#pragma comment(lib,"hook.lib") y,aASy!Q
#ifdef _DEBUG j8lbn |.
#define new DEBUG_NEW }}
IvZG&
#undef THIS_FILE {AZW."?
static char THIS_FILE[] = __FILE__; fE(rDQI
#endif j9Lc2'
#define IDM_SHELL WM_USER+1 /as1
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qZ4DO*%b3
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0j*8|{|
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &ha39&I
class CAboutDlg : public CDialog |2mEowAd
{ YcIk{_N3
public: 6,!]x>B
CAboutDlg(); hgm`6TQ
// Dialog Data \=.iM?T
//{{AFX_DATA(CAboutDlg) =4?m>v,re
enum { IDD = IDD_ABOUTBOX }; GSk;~^l
//}}AFX_DATA $ED<:[3N
// ClassWizard generated virtual function overrides +Ta7b)
//{{AFX_VIRTUAL(CAboutDlg) ,ujoGSx}
protected: 4h-y'&Z
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /@0wbA
//}}AFX_VIRTUAL lO:[^l?F
// Implementation <@oK^ja
protected: xC|7"N^/
//{{AFX_MSG(CAboutDlg) y0Ag px
//}}AFX_MSG f@Db._E
DECLARE_MESSAGE_MAP() mp}ZHuf G
}; :=-h'<D
zE<}_nA
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ,<%],-Lt[
{ q
K]Wk+
//{{AFX_DATA_INIT(CAboutDlg) hEDj"`Px
//}}AFX_DATA_INIT PQ1\b-I
} a6[bF
#\fApRL
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S/8xo@vct]
{ _Nw-|N .
CDialog::DoDataExchange(pDX); HJwj,SL
//{{AFX_DATA_MAP(CAboutDlg) R`Q9|yF\
//}}AFX_DATA_MAP euQd
} PX+$Us
p=T]%k*^h#
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) E:#VS~
//{{AFX_MSG_MAP(CAboutDlg) zDC-PHFHQ
// No message handlers o: qB#8X
//}}AFX_MSG_MAP w_6h
$"^x
END_MESSAGE_MAP() e)O6k7U$
lr=*Ty(V
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) {,,w5/k^
: CDialog(CCaptureDlg::IDD, pParent) Y8(g8RN
{ p,U.5bX
//{{AFX_DATA_INIT(CCaptureDlg) Drc\$<9c@
m_bControl = FALSE; ?NJ\l5'
m_bAlt = FALSE; 5ZUqCl(PX)
m_bShift = FALSE; ^[!LU
m_Path = _T("c:\\"); jrG@
+" }
m_Number = _T("0 picture captured."); jf@#&%AC9
nCount=0; qHklu2_%
bRegistered=FALSE; !'MZeiLP
bTray=FALSE; a,!c6'QE
//}}AFX_DATA_INIT 6*Rz}RQ
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .pK_j~}P
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); q8`JRmt)H
} 0OP6VZ\
MYDAS-
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) LsoP >vJG
{ EX=Q(} 9F<
CDialog::DoDataExchange(pDX); )FYz*:f>&
//{{AFX_DATA_MAP(CCaptureDlg) !Hxx6/
DDX_Control(pDX, IDC_KEY, m_Key); v~9PS2
DDX_Check(pDX, IDC_CONTROL, m_bControl); [*Wq6n
DDX_Check(pDX, IDC_ALT, m_bAlt); M5CFW >T
DDX_Check(pDX, IDC_SHIFT, m_bShift); b1R%JY7/S
DDX_Text(pDX, IDC_PATH, m_Path); AKejWh
DDX_Text(pDX, IDC_NUMBER, m_Number); ?=$a6o
//}}AFX_DATA_MAP 7jvf:#\LtL
} KYZ/b8C
kO+Y5z6=
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) i.C+{QH
//{{AFX_MSG_MAP(CCaptureDlg) \IQf|
ON_WM_SYSCOMMAND() M1-n
ON_WM_PAINT() r1}YN<+,s
ON_WM_QUERYDRAGICON() q",n:=PL
ON_BN_CLICKED(ID_ABOUT, OnAbout) km|;T!
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $_onSYWr
ON_BN_CLICKED(ID_CHANGE, OnChange) g/)mbL>=
//}}AFX_MSG_MAP 5(]=?$$*t
END_MESSAGE_MAP() WnyEdYA
g:7S/L0]
BOOL CCaptureDlg::OnInitDialog() .i)
H1sD
{ BRLrD/8Le
CDialog::OnInitDialog(); N`h, 2!(j
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); %4*-BCP
ASSERT(IDM_ABOUTBOX < 0xF000); S-NKT(H)c
CMenu* pSysMenu = GetSystemMenu(FALSE); |#^wYZO1U
if (pSysMenu != NULL) &!SdO<agZ
{ j'R{llZW
CString strAboutMenu; _0Qp[l-
strAboutMenu.LoadString(IDS_ABOUTBOX); c|.~f+
if (!strAboutMenu.IsEmpty()) N =FX3Z
{ ~oWCTj-
pSysMenu->AppendMenu(MF_SEPARATOR); [+\=x[q
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >4b:`L
} |qnAqzK|
} .7 6T<j_
SetIcon(m_hIcon, TRUE); // Set big icon _bRd2k,
SetIcon(m_hIcon, FALSE); // Set small icon OGpy\0%
m_Key.SetCurSel(0); ^lud2x$O^C
RegisterHotkey(); j")#"& m
CMenu* pMenu=GetSystemMenu(FALSE); T a8;
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); !W4A9Th
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 6O"?wN%$
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6[b'60CuZL
return TRUE; // return TRUE unless you set the focus to a control a~ sU
} C-O~Oi l
W6%\Zwav?)
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) }tJRBb
{ .$&mWytw=
if ((nID & 0xFFF0) == IDM_ABOUTBOX) jGy%O3/
{ cLhHGwX=x
CAboutDlg dlgAbout; #[ZToE4
dlgAbout.DoModal(); +}1h
} Lu?MRF
f
else 14>WpNN
{ mUSrC U_}
CDialog::OnSysCommand(nID, lParam); PIOG|E
} r:;nv D
} Jy<hTd*q
t~_vzG
void CCaptureDlg::OnPaint() i82sMN1jl7
{ JV_VF'
if (IsIconic()) 0i/!by{@
{ ,'!x9 `
CPaintDC dc(this); // device context for painting B}S!l>.z
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \"k[y+O],4
// Center icon in client rectangle r:N =?X`N
int cxIcon = GetSystemMetrics(SM_CXICON); ^i+ d 3
int cyIcon = GetSystemMetrics(SM_CYICON); 7 6 nrDE
CRect rect; (dvsGYT|.
GetClientRect(&rect); :DWvH,{+&
int x = (rect.Width() - cxIcon + 1) / 2; .h c-uaL
int y = (rect.Height() - cyIcon + 1) / 2; nUb0R~wr$G
// Draw the icon c+S<U*
dc.DrawIcon(x, y, m_hIcon); @}K|/
} =f~8"j
else qe^d6
{ AUk-[i
CDialog::OnPaint(); B8Vhl:p
} xD.Uh}:J
} IhR;YM[K
KYw~(+gHv2
HCURSOR CCaptureDlg::OnQueryDragIcon() ke\gzP/
{ Sjb[v
return (HCURSOR) m_hIcon; !V.2~V[^M
} ?58,Ja
&JUHm_wd&S
void CCaptureDlg::OnCancel() V8KdY=[
{ {4]sJT
if(bTray) o,NTIh
DeleteIcon(); vM3 b\yp
CDialog::OnCancel(); };{Qx
} [k~}Fe)x
2.p?gRO
void CCaptureDlg::OnAbout() vQH6CB"
{ FH3^@@Y%
CAboutDlg dlg; 'v^Zterr
dlg.DoModal(); ioW&0?,Ym
} Yq~$pVgf
Sgp1p}
void CCaptureDlg::OnBrowse() ;6)Onwx
{ 57|RE5]|!
CString str; OK] _.v}
BROWSEINFO bi; aw\0\'}
char name[MAX_PATH]; WY& [%r
ZeroMemory(&bi,sizeof(BROWSEINFO)); /}\Uw
bi.hwndOwner=GetSafeHwnd(); `*Ju0)g1
bi.pszDisplayName=name; D[H #W[
bi.lpszTitle="Select folder"; 'g5 Gdn
bi.ulFlags=BIF_RETURNONLYFSDIRS; /gH[|d
LPITEMIDLIST idl=SHBrowseForFolder(&bi); $eu-8E'
if(idl==NULL) 9 $&$Fe
return; kVRh/<s
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); mVsghDESJ)
str.ReleaseBuffer(); b[/uSwvi
m_Path=str; ^]zC~LfG
if(str.GetAt(str.GetLength()-1)!='\\') 1F,>siuh ,
m_Path+="\\"; K@<%Vc>L(
UpdateData(FALSE); CT0 ~
} "3;b,<0
9aoGptgN
void CCaptureDlg::SaveBmp()
}K.2
{ }7HR<%<7
CDC dc; 0ZAT;ea B
dc.CreateDC("DISPLAY",NULL,NULL,NULL); b#[EkI 0@
CBitmap bm; 5H^"
int Width=GetSystemMetrics(SM_CXSCREEN); rtn.^HF
int Height=GetSystemMetrics(SM_CYSCREEN); `JAM]qB"
bm.CreateCompatibleBitmap(&dc,Width,Height); yx\I&\i
CDC tdc; ozOvpi:k3%
tdc.CreateCompatibleDC(&dc); PRi1 `%d
CBitmap*pOld=tdc.SelectObject(&bm);
wa%;'M&
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ""W*) rR
tdc.SelectObject(pOld); b?]Lx.l-
BITMAP btm; kSUpEV+/
bm.GetBitmap(&btm); xH4Qv[k
Q7
DWORD size=btm.bmWidthBytes*btm.bmHeight; U9t-(`[j?
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 0`Hr(J`F
BITMAPINFOHEADER bih; ;r3Xh)k;
bih.biBitCount=btm.bmBitsPixel; ,!>1A;~wT
bih.biClrImportant=0;
#V-0-n,`
bih.biClrUsed=0; !v\_<8
bih.biCompression=0; MO%kUq|pg
bih.biHeight=btm.bmHeight; ?}ly`Js
bih.biPlanes=1; P*:9u>
bih.biSize=sizeof(BITMAPINFOHEADER); #`o]{UfW
bih.biSizeImage=size; Bm$(4
bih.biWidth=btm.bmWidth; iOrpr,@
bih.biXPelsPerMeter=0; YwaWhBCIF
bih.biYPelsPerMeter=0; ~cH3RFV
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,SG-{
static int filecount=0; J.Fy0W@+k4
CString name; %f1>cO9[
name.Format("pict%04d.bmp",filecount++); _eZ*_H,\
name=m_Path+name; krMO<(x+
BITMAPFILEHEADER bfh; tDQuimYu7
bfh.bfReserved1=bfh.bfReserved2=0; 0K'^g0G
bfh.bfType=((WORD)('M'<< 8)|'B'); <,+nS%a
bfh.bfSize=54+size; TjY-C m
bfh.bfOffBits=54; ?F"mZu
CFile bf; x2h5,.K
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ f >$V:e([
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); yp?a7t M
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); PHR:BiMZ
bf.WriteHuge(lpData,size); []l2
`fS#
bf.Close(); Nv5)A=6#AA
nCount++; ZwOX ,D
} \(`8ng]vs
GlobalFreePtr(lpData); 3%L@=q
if(nCount==1) 9$*O ^
m_Number.Format("%d picture captured.",nCount); C
@nA*
else @8eQ|.q]Q
m_Number.Format("%d pictures captured.",nCount); @(W{_ mw
UpdateData(FALSE); AlA:MO]NM
} .K`EflN
k9m9IE"9=$
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +x]3 -s
{ ~-f"&@){,
if(pMsg -> message == WM_KEYDOWN) *W-:]t3CR
{ \e9rXh%
if(pMsg -> wParam == VK_ESCAPE) `e4gneQY
return TRUE; h,zM*z A_
if(pMsg -> wParam == VK_RETURN) *ry}T=
return TRUE; hxZL/_n'
} h.jO3q
return CDialog::PreTranslateMessage(pMsg); 3eERY[
} tA8O(9OV
G\(cnqHk
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O9ar|8y
{ "cz'|z`
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ K_ Od u^
SaveBmp(); N|e#&
return FALSE; bbs'>D3
} I=2b)"t0
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ mqK}yK^P]
CMenu pop; YL&)@h
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); K~6u5 a9s
CMenu*pMenu=pop.GetSubMenu(0); T#GTNk!v
pMenu->SetDefaultItem(ID_EXITICON); ;6M [d
CPoint pt; 'E"W;#%
GetCursorPos(&pt); fj97_Q=
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); } 89-U
if(id==ID_EXITICON) $X,dQ]M
DeleteIcon(); 8/k"A-m
else if(id==ID_EXIT) M(?0c}z
OnCancel(); Mp?L9
return FALSE; <,*3Av
} iAo/Dnp2J
LRESULT res= CDialog::WindowProc(message, wParam, lParam); HCw,bRxm
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) NwyNl
AddIcon(); tU0jFBB
return res; qLV3Y?S!L
} 8d7 NESYl
G%ZP`
void CCaptureDlg::AddIcon() &%`WXe-`R
{
<Hr~|oG
NOTIFYICONDATA data; ;;|.qgxc~
data.cbSize=sizeof(NOTIFYICONDATA); Ka y\;fXT
CString tip; a}Z+"D
tip.LoadString(IDS_ICONTIP); e2yCWolmTS
data.hIcon=GetIcon(0); r+k g$+%b
data.hWnd=GetSafeHwnd(); rK\9#[?x
strcpy(data.szTip,tip); NfWL3"&X
data.uCallbackMessage=IDM_SHELL; [2PPa9F
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; tl;b~k
data.uID=98; (H8JV1J
Shell_NotifyIcon(NIM_ADD,&data); DTlId~Dyq
ShowWindow(SW_HIDE); SBI*[
bTray=TRUE; J7Mbv2D
} ;!A=YXB
~@DdN5
void CCaptureDlg::DeleteIcon() <eZ*LK?
{ {1gT{2/~@
NOTIFYICONDATA data; wYr*('uT
data.cbSize=sizeof(NOTIFYICONDATA); U C_$5~8p
data.hWnd=GetSafeHwnd(); U;j\FE^+>
data.uID=98; Sm{> 8e}UE
Shell_NotifyIcon(NIM_DELETE,&data); _F5*\tQ
ShowWindow(SW_SHOW); &?$mS'P
SetForegroundWindow(); M@o^V(j
ShowWindow(SW_SHOWNORMAL); KP&xk13)
bTray=FALSE; hd]ts.
} 1m5*MY
VeSQq
void CCaptureDlg::OnChange() 4fL`.n1^
{ v-BQ>-& s
RegisterHotkey(); bObsj]
} dI|D c
LmytO$?2(
BOOL CCaptureDlg::RegisterHotkey() c8T| o=`k6
{ Y::O*I2
UpdateData(); <PiO %w{
UCHAR mask=0; >7PNl\=gG
UCHAR key=0; 3YJ"[$w='(
if(m_bControl) F0~<p[9Nx
mask|=4; '/)qI.
if(m_bAlt) d&\3}uH
mask|=2; !*f$*,=^
if(m_bShift) x[0O*ty-*<
mask|=1; A $ ]s{`
key=Key_Table[m_Key.GetCurSel()]; 91]sO%3
if(bRegistered){ ]T'7+5w
DeleteHotkey(GetSafeHwnd(),cKey,cMask); }=}wLm#&1
bRegistered=FALSE; i4]oE&G
} gJCZ9{Nl
cMask=mask; 2v2XU\u{t
cKey=key; $rlrR'[H
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); kIX1u<M~
return bRegistered; bAbR0)
} x|O^#X(,
.`Q^8|$-K
四、小结 #y[U2s Se
Nk<^ Qv
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。