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:
eT* )r~
mcvd/ 一、实现方法
&~Qi+b0! 5]D"y Ay81 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:
(!`TO{ !6P p2s*'dab7 #pragma data_seg("shareddata")
N]f"+ HHOOK hHook =NULL; //钩子句柄
e=S51q_0 UINT nHookCount =0; //挂接的程序数目
:!H]gC
4 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
rvrv[^a( static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
|zhVl static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
;LSdY}*%0 static int KeyCount =0;
YTP6m9hA+ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
&o@IMbJ8 #pragma data_seg()
>Z@^R7_W F)rU*i7 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。
,)-7f| I,J*\)-%J 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:
d;1%Ei3K z2p@d1 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
yzJ
VU0s cKey,UCHAR cMask)
\1x<bx/1 {
RS'!>9I BOOL bAdded=FALSE;
}j9V0`Q for(int index=0;index<MAX_KEY;index++){
1Z-f@PoM if(hCallWnd[index]==0){
J<J_yRg2 hCallWnd[index]=hWnd;
cYHHCaCS HotKey[index]=cKey;
], Xva`" HotKeyMask[index]=cMask;
7J?`gl&C bAdded=TRUE;
}@JPvIE KeyCount++;
y!JZWq%= break;
v53qpqc }
Ovu!G
q }
7L68voC@U return bAdded;
QfqosoP\D }
x`:zC# //删除热键
+*/XfPlr| BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
5y3V duE {
p1^k4G BOOL bRemoved=FALSE;
ON"F
h'? for(int index=0;index<MAX_KEY;index++){
8:s"
^YLN if(hCallWnd[index]==hWnd){
^0"W/ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
M;s r1C hCallWnd[index]=NULL;
%^1@c f?. HotKey[index]=0;
(<y~]ig y HotKeyMask[index]=0;
\Eqxmo bRemoved=TRUE;
%C}TdG(C KeyCount--;
`x%(
n@ g break;
N0`v;4gF$] }
!\D[lh}rL }
;oL`fQyr }
0Bbno9Yp return bRemoved;
Y [8~M8QX }
F/1B>2$` J~dk4D\ lI#Ap2@ DLL中的钩子函数如下:
7ip$#pzo Qy!*U%tG' LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
dG5p`N% {
^B)iBfZ BOOL bProcessed=FALSE;
#Fp5>%* if(HC_ACTION==nCode)
@nIoYT=' {
}\+7*| if((lParam&0xc0000000)==0xc0000000){// 有键松开
'#JC 6#X switch(wParam)
MA9Oi(L)K {
9k5$rK` case VK_MENU:
"zpc)'$L= MaskBits&=~ALTBIT;
^eu={0k break;
=2-!ay: case VK_CONTROL:
%=C49(/K_ MaskBits&=~CTRLBIT;
e6O +hC]: break;
0|mF
/ case VK_SHIFT:
osB8
'\GR MaskBits&=~SHIFTBIT;
ZV :cgv break;
hRKAs
]^j default: //judge the key and send message
b=Rw=K.
break;
7Q_AZR4 }
~o"VZp for(int index=0;index<MAX_KEY;index++){
VG,O+I'^z if(hCallWnd[index]==NULL)
|Dz$OZP continue;
u7L!&/ 6On if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.aJ\^Fx {
J-Xw}|>@ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
qHM,#W< bProcessed=TRUE;
=}SH*xi6 }
8HL$y-F }
UvR F\x% }
6Ja} N else if((lParam&0xc000ffff)==1){ //有键按下
tXZE@JyuC switch(wParam)
s+9q`k^ {
0[ (Z48 case VK_MENU:
(7v]bqfw MaskBits|=ALTBIT;
AHa%?wb break;
x}acxu 2H7 case VK_CONTROL:
}ZPO^4H;- MaskBits|=CTRLBIT;
HfQZRDH break;
>b6!*Lrhs case VK_SHIFT:
T~=r*4 MaskBits|=SHIFTBIT;
"YW&,X5R break;
A:{PPjs%LA default: //judge the key and send message
+@n8DM{b break;
P;B<R" }
J`uO~W" for(int index=0;index<MAX_KEY;index++){
_tl if(hCallWnd[index]==NULL)
6I5,PB continue;
ED0Vlw+1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
f=$w,^)M {
v$H=~m SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
l'Oz-p.@ bProcessed=TRUE;
2.xA' \M }
<oJM||ZA }
R8Kj3wp }
e|6kgj3/ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
:[hZn/ for(int index=0;index<MAX_KEY;index++){
e7T}*Up if(hCallWnd[index]==NULL)
+`y{r^xD continue;
{xW HKsI>, if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
`,-w+3?Al SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Wc6Jgpl //lParam的意义可看MSDN中WM_KEYDOWN部分
uv&??F]/ }
kPuY[~i% }
pQ:7%+Om }
;F)j,Ywi)H return CallNextHookEx( hHook, nCode, wParam, lParam );
QJeL&mf }
LIm{Y`XU 2N)siH 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
]g/:l S4 ef
!@|2 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
mgODJ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
P@LFX[HtM &?(<6v7 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
NVt612/'7y E ISgc {s LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
*wvd[q h {
*9XKkR<r if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
MKl`9 Y3Ge {
CtEpS<*c //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
TnuNoMD. SaveBmp();
!+<OED=qe return FALSE;
Z}b25) }
G)(vd0X1 …… //其它处理及默认处理
D'Fj"&LK }
qdss(LZ O)2==_f\ ?2RDd|# 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
G}|!Jdr As5*)o"& 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
||xiKg C[4{\3\Va 二、编程步骤
SC Qr/Q [osIQ!u;: 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
X-lB1uq^ e1Ne{zg~ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
>EacXPt-O BXzn-S 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
H}ie D"T_ %oee x1`= 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
yF [|dB J*!_kg)>J 5、 添加代码,编译运行程序。
55%j$f aa-{,X"MF 三、程序代码
MAv-`8@| >e'Hz (~'/ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
5.IX #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
>TKl`O #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
vzXfJP #if _MSC_VER > 1000
tPQjjoh #pragma once
I`% ]1{ #endif // _MSC_VER > 1000
B'AU~#d #ifndef __AFXWIN_H__
6bE~m<B\` #error include 'stdafx.h' before including this file for PCH
{E 'go] #endif
hOOkf mOM #include "resource.h" // main symbols
\me'B {aa class CHookApp : public CWinApp
y;GwMi$KI {
g,k} nkIT public:
)R+26wZ|n* CHookApp();
tCF,KP? // Overrides
aSGZF w // ClassWizard generated virtual function overrides
N I*x):bx //{{AFX_VIRTUAL(CHookApp)
],W/IDv public:
B$\,l.hE virtual BOOL InitInstance();
6r]l8*34; virtual int ExitInstance();
u&E$( //}}AFX_VIRTUAL
:j<ij]rsI //{{AFX_MSG(CHookApp)
Ic<J]+Xq // NOTE - the ClassWizard will add and remove member functions here.
+46m~" ] // DO NOT EDIT what you see in these blocks of generated code !
F%-KY$% //}}AFX_MSG
#Wf9` DECLARE_MESSAGE_MAP()
\nzaF4+$ };
tCVaRP8eC+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
0etJ, _"> BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
eI^Q!b8n BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
aioN)V BOOL InitHotkey();
BH<jnQ BOOL UnInit();
Dt ~3Qd0 #endif
rGqT[~{t ]di^H>,xU //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
~d9@m#_T#~ #include "stdafx.h"
j,Vir"-) #include "hook.h"
r8wip\[ #include <windowsx.h>
#
o;\5MOE% #ifdef _DEBUG
([#4H3uO- #define new DEBUG_NEW
p]]*H2UD #undef THIS_FILE
W3gBLotdg static char THIS_FILE[] = __FILE__;
Vlf =gP #endif
s?9$o
Qq1 #define MAX_KEY 100
\*
/R6svz #define CTRLBIT 0x04
g'pB<?'E' #define ALTBIT 0x02
S 9;:) #define SHIFTBIT 0x01
9 aacW #pragma data_seg("shareddata")
aCZ7G
%Y HHOOK hHook =NULL;
( +x!wX( x UINT nHookCount =0;
d1{%z\u
a static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Kqn{q4L static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
-qDM(zR static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
o-ee3j. static int KeyCount =0;
B*-A erdH static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
aSEzh78 #pragma data_seg()
&2Q0ii#Aa HINSTANCE hins;
Y@#rGV> void VerifyWindow();
>39\u&) BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
vw'BKi
F //{{AFX_MSG_MAP(CHookApp)
wRCv?D`vV // NOTE - the ClassWizard will add and remove mapping macros here.
0;X0<IV // DO NOT EDIT what you see in these blocks of generated code!
?3t]9z //}}AFX_MSG_MAP
5;:964Et END_MESSAGE_MAP()
(oG-h"^/ TNj WZ CHookApp::CHookApp()
g-NfZj? {
=
a54 // TODO: add construction code here,
`*ml/% \
// Place all significant initialization in InitInstance
fnJ!~b*qo }
YsBOh{Ml "3H?_!A9 CHookApp theApp;
([Da*Tk* LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
h4,S/n {
2+'4 m#@) BOOL bProcessed=FALSE;
>$/PfyY7@# if(HC_ACTION==nCode)
hAvX{] {
9`|
^cL*6 if((lParam&0xc0000000)==0xc0000000){// Key up
g+zfa.wQ switch(wParam)
xU(yc}vw, {
%AV[vr, case VK_MENU:
=JM !`[ MaskBits&=~ALTBIT;
(\A~SKEX break;
WW.amv/[a case VK_CONTROL:
>=VtL4K^ MaskBits&=~CTRLBIT;
M!Wjfq
^~ break;
a(|,KWHn case VK_SHIFT:
e"u89acp MaskBits&=~SHIFTBIT;
,b!]gsds break;
D/<;9hw default: //judge the key and send message
47
|&(,{ break;
eN Y? }
W>2m%q
U for(int index=0;index<MAX_KEY;index++){
AfqthI$*m if(hCallWnd[index]==NULL)
?]Wg{\NC6 continue;
=.9uuF: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.0ExHcr {
hL(zVkYI SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
IuOY.c2.u bProcessed=TRUE;
w.9'TR }
!Bqmw }
>"%}x{| }
w.0:#4 else if((lParam&0xc000ffff)==1){ //Key down
Z^l!#"\4m switch(wParam)
7TaHE
{
Hp1n*0%dZ& case VK_MENU:
F =Zc_ MaskBits|=ALTBIT;
d:%!)s break;
3B6"T;_ case VK_CONTROL:
<7X6ULQ MaskBits|=CTRLBIT;
m@#@7[6]o break;
|h{#r7H0 case VK_SHIFT:
LE>b_gQ$
2 MaskBits|=SHIFTBIT;
U|YIu!^ break;
u^Ss8}d default: //judge the key and send message
zZ})$Ny( break;
!-<PV }
!^*-]p/z for(int index=0;index<MAX_KEY;index++)
WY`hNT6M {
-'F? | if(hCallWnd[index]==NULL)
$9In\x
continue;
cpe/GvD5] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
`xm4?6 {
`GQ'yv SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Qf<@
:T* bProcessed=TRUE;
vb1Gz]~)> }
[;*Vm0>t }
=j$!N# L }
%Tvy|L
, if(!bProcessed){
aa10vV for(int index=0;index<MAX_KEY;index++){
mO~A}/je if(hCallWnd[index]==NULL)
6d%'>^`(o- continue;
[T>a}}@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
pQ/
bIuq SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
#nS[]UbwZ }
0*umf.R }
xZpGSlA }
%^VQw! return CallNextHookEx( hHook, nCode, wParam, lParam );
9p '#a: }
szG 0?e *LZ^0c: r BOOL InitHotkey()
Eg;xj@S<2 {
/N?vVp if(hHook!=NULL){
^V5g[XL2 nHookCount++;
JAA{5@ST return TRUE;
Ei&
Z }
&8^ch,+pD else
wg0hm#X hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Dw-i!dq if(hHook!=NULL)
6*Y>Y&sea nHookCount++;
Ohe*m[ return (hHook!=NULL);
WG\gf\= I }
rh%-va9 BOOL UnInit()
PRi3=3oF {
H6Qb]H.C if(nHookCount>1){
!/|^
)d^U nHookCount--;
`kERM-@A return TRUE;
xw5LPz;B }
KWzJ BOOL unhooked = UnhookWindowsHookEx(hHook);
Z.v2!u if(unhooked==TRUE){
Ag#o&Y nHookCount=0;
7\e96+j|f hHook=NULL;
pS
C5$a( }
;{e=Iz}/ return unhooked;
|4tnG&= }
LG6k
KG ctB(c`zcY BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
YR$)yl {
TA~YCj$ BOOL bAdded=FALSE;
60`4
_Uy]_ for(int index=0;index<MAX_KEY;index++){
H*&ZXAKv if(hCallWnd[index]==0){
.gS
x`|! hCallWnd[index]=hWnd;
lAcXi$pF HotKey[index]=cKey;
R:}u(N HotKeyMask[index]=cMask;
f} _d`?K bAdded=TRUE;
+&:?*(?Q KeyCount++;
v!b
8_0~u6 break;
:(o6^%x }
oy?>e1Sy* }
5PXo1"n8T return bAdded;
Q[U_
0O,A9 }
|loo^!I x22:@Ot6 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
AT6:&5_` {
Jfkdiyy" BOOL bRemoved=FALSE;
n$S`NNO{] for(int index=0;index<MAX_KEY;index++){
1FO T if(hCallWnd[index]==hWnd){
<y30t[.E6 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
{ylhh%t4hi hCallWnd[index]=NULL;
Zagj1OV| HotKey[index]=0;
_a e&@s1 HotKeyMask[index]=0;
=cN!h"C[ bRemoved=TRUE;
_=\=oC KeyCount--;
/e0cx:.w break;
qauZ-Qoc9 }
_\y%u_W }
<m|\#Jw_V }
*~0Ko{Avc return bRemoved;
]XAJ|[]sj* }
ZX
Sl+k. p>c` GDU void VerifyWindow()
8!c#XMHV {
W6>SYa for(int i=0;i<MAX_KEY;i++){
hDf|9}/UQd if(hCallWnd
!=NULL){ ;C+g)BW
if(!IsWindow(hCallWnd)){ nHB=*Mj DV
hCallWnd=NULL; qK9\oB%s7
HotKey=0; ~^GY(J'
HotKeyMask=0; ?(!<m'jEy
KeyCount--; 5r$X
} xa?#wY
b
} .PhH|jrCW^
} q:9#Vcw
} ERE1XOe=D
[v!TQwMU
BOOL CHookApp::InitInstance() u
VZouw#
{ i(k]}Di:
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 8sV_@<l<X
hins=AfxGetInstanceHandle(); aeBA`ry"B
InitHotkey();
/
hl:p
return CWinApp::InitInstance(); =`l).GnN2`
} ~GWn >
h6Vm;{~
int CHookApp::ExitInstance() jr9/
{ y+PiH
VerifyWindow(); -a}d
@&
UnInit(); UW%.G
return CWinApp::ExitInstance(); HcrI3v|6
} 8] BOq:
71h?t`N
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file N{(Q,+ ~
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) j9=QOq
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ _H41qKS{Ul
#if _MSC_VER > 1000
<$\En[u0
#pragma once P
K]$D[a0
#endif // _MSC_VER > 1000 4ZZ/R?AiK
gDmwJr
class CCaptureDlg : public CDialog C98 Ks
{ 7D;g\{>M
// Construction j3W)5ZX
public: E!eBQ[@
BOOL bTray;
'kD~tpZ
BOOL bRegistered; #jja#PF]7
BOOL RegisterHotkey(); ;'B\l@U\
UCHAR cKey; ~$zodrS9
UCHAR cMask; Uv-xP(X
void DeleteIcon(); osJ;"B36
void AddIcon(); UO&
p2
UINT nCount; JERWz~n}
void SaveBmp(); r#K;@wu2
CCaptureDlg(CWnd* pParent = NULL); // standard constructor |Q'l&Gt6
// Dialog Data @Ik@1
//{{AFX_DATA(CCaptureDlg) u'?yc"d>#
enum { IDD = IDD_CAPTURE_DIALOG }; U*Hw
t\
CComboBox m_Key; f&\v+'[p
BOOL m_bControl; -}Jf4k#G
BOOL m_bAlt; )7e[o8O_6
BOOL m_bShift; H nRd
CString m_Path; 0wmz2zKV
CString m_Number; j]#-DIL
//}}AFX_DATA ZjE!?
'(ef
// ClassWizard generated virtual function overrides 4I>I
//{{AFX_VIRTUAL(CCaptureDlg) 9Fl}"p[>L.
public: ;btH[a iV
virtual BOOL PreTranslateMessage(MSG* pMsg); zk[%YG&
protected: v;9VX
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V8z91
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]Y3|*t(\
//}}AFX_VIRTUAL S)@95pb
// Implementation 3zO'=gwJ
protected: Om%9 x
HICON m_hIcon; +M+ht
// Generated message map functions axl!zu*
//{{AFX_MSG(CCaptureDlg) {I!sXj
virtual BOOL OnInitDialog(); By
t{3$
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 4s!rrDN
afx_msg void OnPaint();
#!?5^O
afx_msg HCURSOR OnQueryDragIcon(); 0YsC@r47wL
virtual void OnCancel(); {-sy,EYcw
afx_msg void OnAbout(); >qJRpO
afx_msg void OnBrowse(); !cs+tm3
afx_msg void OnChange(); uLw$`ihw
//}}AFX_MSG n=vW oU9
DECLARE_MESSAGE_MAP() o,!r t1&0
}; b@OL!?JP
#endif y7I')}SC
|]5g+sd
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C^@~
#include "stdafx.h" 8
0>qqz
#include "Capture.h" "RG.27
#include "CaptureDlg.h" C(:tFuacpw
#include <windowsx.h> 5-L?JD4&
#pragma comment(lib,"hook.lib") #L-3eW=f
#ifdef _DEBUG rNL*(PN}lO
#define new DEBUG_NEW Y
9eGDpW
#undef THIS_FILE ,6Kx1 c
static char THIS_FILE[] = __FILE__; 9HOdtpQOV
#endif BfLh%XC
#define IDM_SHELL WM_USER+1 qY24Y
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >Xq:?}-m2
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); XD5z+/F<"0
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; lE+v@Kb:
class CAboutDlg : public CDialog 6#+&_#9
{ '[]V%^F
public: 4#?OxvH
CAboutDlg(); $ 1 N_qu
// Dialog Data %Dg]n4f
//{{AFX_DATA(CAboutDlg) 93|u.
@lEy
enum { IDD = IDD_ABOUTBOX }; :^DuB_
//}}AFX_DATA ellj/u61bj
// ClassWizard generated virtual function overrides V4GcW|P4y
//{{AFX_VIRTUAL(CAboutDlg) eKlh }v
protected: 0k I.dX)
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support bJD2c\qoc
//}}AFX_VIRTUAL TxYxB1C)
// Implementation VJM n5v[V
protected: L;=<d
//{{AFX_MSG(CAboutDlg) @0q%&v0
//}}AFX_MSG Ed3 *fY
DECLARE_MESSAGE_MAP() Be{7Rj v
}; OLc/Vij;
)o'&f"/
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) dZ&/Iz
{ 3F ;+D
//{{AFX_DATA_INIT(CAboutDlg) (5%OAjW
//}}AFX_DATA_INIT &N!QKrj3
} }d2]QD#O
4/$ $?w4
void CAboutDlg::DoDataExchange(CDataExchange* pDX) v\#69J5.>)
{ >dol
CDialog::DoDataExchange(pDX); @x">e][B
//{{AFX_DATA_MAP(CAboutDlg) KaC+x-%K
//}}AFX_DATA_MAP Y@._dliM
} }O<u
V.kUFTCvf
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) SrfDl*
//{{AFX_MSG_MAP(CAboutDlg) qZlb?b"
// No message handlers l6.z-Qw
//}}AFX_MSG_MAP 0nS69tH
END_MESSAGE_MAP() }"j7Qy)cs
&ZgB b
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (eI'%1kS<
: CDialog(CCaptureDlg::IDD, pParent)
N3Ub|$}q
{ o'@VDGS`
//{{AFX_DATA_INIT(CCaptureDlg) vV:eU-a
m_bControl = FALSE; jE.U~D)2YF
m_bAlt = FALSE; mT;1KE{J{
m_bShift = FALSE; i{w<4E3
m_Path = _T("c:\\"); KTd,^h
m_Number = _T("0 picture captured."); fr8:L!9
nCount=0; MoN;t;
bRegistered=FALSE; 4"fiEt,t<x
bTray=FALSE; D}l^ow
//}}AFX_DATA_INIT ]sJWiIe.
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Vd[[<
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); r{.DRbn
} >Liv].
-tWkN^j8+
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) DQ^yqBVgQ
{ oJy ]n9
CDialog::DoDataExchange(pDX); D^To:N7U
//{{AFX_DATA_MAP(CCaptureDlg) I ;N)jj`b
DDX_Control(pDX, IDC_KEY, m_Key); \3(d$_:b
DDX_Check(pDX, IDC_CONTROL, m_bControl); eLcP.;Z
DDX_Check(pDX, IDC_ALT, m_bAlt); EUj'%;sz-
DDX_Check(pDX, IDC_SHIFT, m_bShift); ~HD:Y7
DDX_Text(pDX, IDC_PATH, m_Path); MNNPBE
DDX_Text(pDX, IDC_NUMBER, m_Number); Sc;WraEn2
//}}AFX_DATA_MAP GcQO&oq|
} r#
5))q-
}wrZP}zM>
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ,{A-<=6t
//{{AFX_MSG_MAP(CCaptureDlg) ;JMd(\+-
ON_WM_SYSCOMMAND() j"*ZS'0
ON_WM_PAINT() ig^9lM'
ON_WM_QUERYDRAGICON() y\b.0-z
ON_BN_CLICKED(ID_ABOUT, OnAbout) QIVpO /@
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) MK7S*N1
ON_BN_CLICKED(ID_CHANGE, OnChange) 't
\:@-tQ
//}}AFX_MSG_MAP pb_+_(/c
END_MESSAGE_MAP() > bWsUG9
>}h/$bU
BOOL CCaptureDlg::OnInitDialog() MNO T<(
{ ce&)djC7U
CDialog::OnInitDialog(); 09`5<9/
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); DYJ@>8
ASSERT(IDM_ABOUTBOX < 0xF000); J]5sWs
CMenu* pSysMenu = GetSystemMenu(FALSE); zr%lBHuW
if (pSysMenu != NULL) #q40 >)]
{ iy Zs:4jkc
CString strAboutMenu; PhF3' ">
strAboutMenu.LoadString(IDS_ABOUTBOX); ?J,hv'L]
if (!strAboutMenu.IsEmpty()) &yv%"BPV
{ =YkJS%)M)
pSysMenu->AppendMenu(MF_SEPARATOR); @ 'rk[S}A
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Ia$&SS)K
} wy"^a45h
} 0PD]#.+
SetIcon(m_hIcon, TRUE); // Set big icon I&qT3/SVI
SetIcon(m_hIcon, FALSE); // Set small icon Ce}wgKzr
m_Key.SetCurSel(0); 0\O*\w?
RegisterHotkey(); 6*Jd8Bva\o
CMenu* pMenu=GetSystemMenu(FALSE); fD#|C~:=
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); :;\>jxA
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (L_txd4
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _Dl!iV05:
return TRUE; // return TRUE unless you set the focus to a control u&1n~t`
} l~Je]Qt
FqAW><
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) d9h"Q
{ -8; ,#
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 1tU}}l
{ *_}|EuY
CAboutDlg dlgAbout; 8;/`uB:zV
dlgAbout.DoModal(); tpj({
} x; 89lHy@e
else "knSc0,u
{ W+V#z8K
CDialog::OnSysCommand(nID, lParam); Es6b~#
} c%w@-n`
} r 11:T3
aN{C86wx
void CCaptureDlg::OnPaint() y-O#
+{7
{ 1[o] u:m9U
if (IsIconic()) n}PK0
{ {C Qo}@.7
CPaintDC dc(this); // device context for painting He="S3XON
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); SC)4u l%
// Center icon in client rectangle V*xT5TljS-
int cxIcon = GetSystemMetrics(SM_CXICON); |rkj$s,
int cyIcon = GetSystemMetrics(SM_CYICON); iJuh1+6:c9
CRect rect; J
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GetClientRect(&rect); ,A9pj k'
int x = (rect.Width() - cxIcon + 1) / 2; Ps5UX6\ .m
int y = (rect.Height() - cyIcon + 1) / 2; ZYZQ?FN
// Draw the icon LivPk`[
dc.DrawIcon(x, y, m_hIcon); I
<`9ANe
} 6*%3O=*
else 8WK%g0gm
{ WJCEiH
CDialog::OnPaint(); )nU%}Z
}
Fv=7~6~
} bs$x%CR
^^QW<
HCURSOR CCaptureDlg::OnQueryDragIcon() N#'+p5|>
{ |&+g ,A _w
return (HCURSOR) m_hIcon; (qT_4b~
} pe=Ou0
5"Q3,4f
void CCaptureDlg::OnCancel() &hWLG<IE
{ i"2[OM\j7
if(bTray) fBS`b[x
DeleteIcon(); b;K>Q!(|
CDialog::OnCancel(); 6z@OGExmd#
} WV_y@H_
J;4x-R$W
void CCaptureDlg::OnAbout() L+2!Sc,>
{ pvM;2
CAboutDlg dlg; :L<$O7
dlg.DoModal(); hM\<1D
CKG
} =\.Oc+p4
'jWd7w~(
void CCaptureDlg::OnBrowse() c0jdZ#H
{ [b-27\b
CString str; peqoLeJI
BROWSEINFO bi; e_s9E{(
char name[MAX_PATH]; *f|9A/*B3
ZeroMemory(&bi,sizeof(BROWSEINFO)); } r^@Xh
bi.hwndOwner=GetSafeHwnd(); YgiwtZ5FY
bi.pszDisplayName=name; o.U$\9MNP
bi.lpszTitle="Select folder"; 4} uX[~e&
bi.ulFlags=BIF_RETURNONLYFSDIRS; 9k =-8@G9
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ;V]EF
if(idl==NULL) bUbM }
return; D ODo
!
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); MVHj?
str.ReleaseBuffer(); IQ[?ej3W
m_Path=str; ZK<kn8JJ
if(str.GetAt(str.GetLength()-1)!='\\') T677d.zaT
m_Path+="\\"; 4qo4g+
UpdateData(FALSE); 9'F-D
} (yQ]n91 Q,
7qSlqA<Hs
void CCaptureDlg::SaveBmp() Dt?O_Bdv[
{ 2xRb$QF
CDC dc; Okm&b g
dc.CreateDC("DISPLAY",NULL,NULL,NULL); QA7SQcd,
CBitmap bm; eA9U|&o
int Width=GetSystemMetrics(SM_CXSCREEN); _KiaeVE
int Height=GetSystemMetrics(SM_CYSCREEN); P
lJl#-BO
bm.CreateCompatibleBitmap(&dc,Width,Height); fo~8W`H&
CDC tdc; <e"O`*ZJ
tdc.CreateCompatibleDC(&dc); 'SF+P)Kmz
CBitmap*pOld=tdc.SelectObject(&bm); B;tU+36nM
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); JPL8fX-w
tdc.SelectObject(pOld); lQQXV5NV
BITMAP btm; x bF*4;^SI
bm.GetBitmap(&btm); ;;'b;,/
DWORD size=btm.bmWidthBytes*btm.bmHeight; f%9EZ+OP
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 8>a/x ,
BITMAPINFOHEADER bih; {Pm^G^EP
bih.biBitCount=btm.bmBitsPixel; tdg.vYMDPC
bih.biClrImportant=0; /9dV!u!;
bih.biClrUsed=0; +4^XFPq~
bih.biCompression=0; /!ZeMY:x
bih.biHeight=btm.bmHeight; ,?i^i#Wqzg
bih.biPlanes=1; YAnt}]u!"
bih.biSize=sizeof(BITMAPINFOHEADER); M iIH&z
bih.biSizeImage=size; ;:1d<Q|
bih.biWidth=btm.bmWidth; avxI\twAU
bih.biXPelsPerMeter=0; "Q9S<O8)
bih.biYPelsPerMeter=0; NhQIpzL)
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); b $x<7l5C
static int filecount=0; @
fm\
H
CString name; jQ.]m
name.Format("pict%04d.bmp",filecount++); +aRjJ/*
name=m_Path+name; <\Nf6>_qEM
BITMAPFILEHEADER bfh; <b"ynoM.A
bfh.bfReserved1=bfh.bfReserved2=0; P;0tI;
bfh.bfType=((WORD)('M'<< 8)|'B'); t ]{qizfOB
bfh.bfSize=54+size; =Run
bfh.bfOffBits=54; zMb7a_W
CFile bf; t$=FcKUV}f
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ U~Aw=h5SD
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^zkTV_,cRp
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,
RfU1R
bf.WriteHuge(lpData,size); &3v{~Xg)
bf.Close(); L^rtypkJ
nCount++; {LTb-CB
} Qfo'w%px
GlobalFreePtr(lpData); H4 Y7p
if(nCount==1) pWH8ex+
m_Number.Format("%d picture captured.",nCount); j~c7nWfX
else d$)'?Sf]h
m_Number.Format("%d pictures captured.",nCount); [^ck;4q
UpdateData(FALSE); Malt7M
} \lHi=}0
="
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Pa2HFy2
{ K
!8+~[
if(pMsg -> message == WM_KEYDOWN) 8yax.N
j
{ qT#+DDEAL
if(pMsg -> wParam == VK_ESCAPE) @8C^[fDL
return TRUE;
At%g^
if(pMsg -> wParam == VK_RETURN) JbzYr]k
return TRUE; Taxi79cH
} kbBD+*
return CDialog::PreTranslateMessage(pMsg); ^ cN-
} _m;cX!+~_
XG<J'3
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `
_()R`=
{ _dppUUm
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ D
h ]+HF
SaveBmp(); $1oU^VY
return FALSE; ]+)z}lr8 C
} FOpOS?Cr'
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ PYr#vOH
CMenu pop; {r.#R|
4v
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); mJewUc!<5
CMenu*pMenu=pop.GetSubMenu(0); V S2p"0$3D
pMenu->SetDefaultItem(ID_EXITICON); ,HS\(Z
CPoint pt; 1YR;dn
GetCursorPos(&pt); H? N!F7s
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]7zDdI|
if(id==ID_EXITICON) &q1(v3cOO
DeleteIcon(); C.@R#a'
else if(id==ID_EXIT) z;1tJ
OnCancel(); {>OuxVl??k
return FALSE; 7M}T^LC
} (rFY8oHD
LRESULT res= CDialog::WindowProc(message, wParam, lParam); U
jVo "K
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) aW %ulZ
AddIcon(); % Z&[wU~
return res; k<=.1cFh
} KXcG;b[7n
7^Uv1ezDR
void CCaptureDlg::AddIcon() R+lKQAyC0=
{ hU5[k/ q
NOTIFYICONDATA data; )vOZp&
data.cbSize=sizeof(NOTIFYICONDATA); iKV;>gF,)v
CString tip; .{HU1/!
tip.LoadString(IDS_ICONTIP); -"Lia!Q]M
data.hIcon=GetIcon(0); VJD$nh
#M5
data.hWnd=GetSafeHwnd(); t-dN:1
strcpy(data.szTip,tip); eOy{]<l3
data.uCallbackMessage=IDM_SHELL; KQ?E]}rZ
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; )=9\6zXS
data.uID=98; e`4OlM]
Shell_NotifyIcon(NIM_ADD,&data); kJy<vb~
ShowWindow(SW_HIDE); /YHBhoat
bTray=TRUE; :<gmgI
} .Xo, BEjE/
ywmx6q4MFL
void CCaptureDlg::DeleteIcon() ^Ot+,l)
{ 7u,56V?X
NOTIFYICONDATA data; 3nd02:GF
data.cbSize=sizeof(NOTIFYICONDATA); {#uX
data.hWnd=GetSafeHwnd(); TuwH?{
FzK
data.uID=98; o; 6\
Shell_NotifyIcon(NIM_DELETE,&data); sBS\S
ShowWindow(SW_SHOW); T_6,o[b8
SetForegroundWindow(); &of%;>$>M
ShowWindow(SW_SHOWNORMAL); Mp?Ev.
bTray=FALSE; m^U\l9LE
} RoM'+1nP:#
5'\/gvxIC
void CCaptureDlg::OnChange() a~OCo
{ ,nMLua\
RegisterHotkey(); P^v`5v
} .,l?z
=Z2U
BOOL CCaptureDlg::RegisterHotkey() en!cu_]t
{ 6 )0$UW
UpdateData(); WXNJc
UCHAR mask=0; nfy"M),et
UCHAR key=0; 8_U*_I7(
if(m_bControl) -}2q-
mask|=4; CeR4's7
if(m_bAlt) #E5#{bra
mask|=2; Vj0`*nC)/
if(m_bShift) $b\Gl=YX^
mask|=1; E~2}rK+#)
key=Key_Table[m_Key.GetCurSel()]; 3RscuD&
if(bRegistered){ q{@>2AlK
DeleteHotkey(GetSafeHwnd(),cKey,cMask); o?$D09j;;
bRegistered=FALSE; A[XEbfDO
} U;OJ.a9
cMask=mask; `zC_?+
cKey=key; p4<&N MG
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )oG_x{
return bRegistered; |?V6__9
} T$GhE
r4Pm
i
四、小结 3?Bq((
cliP+#
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。