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:
!~|-CF0z=
QdgJNT<=H, 一、实现方法
#csP.z3^y Tc(=J7*r& 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:
(T*$4KGV JwbZ`Z*w #pragma data_seg("shareddata")
j Mn,N9Mf HHOOK hHook =NULL; //钩子句柄
I(^0/]' UINT nHookCount =0; //挂接的程序数目
Imv#7{ndq static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
U${W3Ra static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Os<E7l zqO static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
v82wnP-~7 static int KeyCount =0;
./ {79 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
:\|A.#
U #pragma data_seg()
Rq}lW.<r {R ),7U8 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。
Nbr$G=U -
]wT DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
C7S\4rDJ }O*`I( BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
u79- B-YW^ cKey,UCHAR cMask)
R`<^/h {
=|-=4.b+| BOOL bAdded=FALSE;
5;}W=x^$a for(int index=0;index<MAX_KEY;index++){
Dsm1@/"i|7 if(hCallWnd[index]==0){
?Ujg.xo\ hCallWnd[index]=hWnd;
xuvW6Q; HotKey[index]=cKey;
/-p!|T}w HotKeyMask[index]=cMask;
ZMQ=D!kT bAdded=TRUE;
MoFM'a9 KeyCount++;
aB6xRn9 break;
E<\$3G-do }
YHEn{z7 }
wNHn. return bAdded;
pbAL& } }
QP%_2m>yhl //删除热键
tle`O)&uo BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
E@ :9|5 {
(1'DZxJ&u BOOL bRemoved=FALSE;
0<%$lr for(int index=0;index<MAX_KEY;index++){
{K.H09Y if(hCallWnd[index]==hWnd){
es*$/A if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
ZwDL hCallWnd[index]=NULL;
elR'e6Q HotKey[index]=0;
w6s[|i)& HotKeyMask[index]=0;
N_T5sZ\ bRemoved=TRUE;
G[mqLI{q KeyCount--;
dQ8RrD=$& break;
|4mvB2r }
fLe~X!#HF }
,m<YSMKX }
~^obf(N` return bRemoved;
Y$L`
G }
K[y")ooE<j ]u5TvI,C 6o^>q&e}% DLL中的钩子函数如下:
^f,4=- ;}+M2Ec51 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
? uYO]!VC {
zufphS| BOOL bProcessed=FALSE;
Be|! S_Y P if(HC_ACTION==nCode)
X_2N9$}, {
hTDGgSG^ if((lParam&0xc0000000)==0xc0000000){// 有键松开
Q("m*eMRt switch(wParam)
YcA. Bn|as {
]pvHsiI: case VK_MENU:
NAD^10 MaskBits&=~ALTBIT;
Ve(<s
break;
$L^%*DkM case VK_CONTROL:
\>5sW8P]H` MaskBits&=~CTRLBIT;
futYMoV break;
#1%@R<` case VK_SHIFT:
E,m|E]WP MaskBits&=~SHIFTBIT;
BHY-fb@R]H break;
rT `sY default: //judge the key and send message
h A ){>B<; break;
fJ/INL }
:XY%@n for(int index=0;index<MAX_KEY;index++){
)(]rUJ~+~A if(hCallWnd[index]==NULL)
d7kE}{, continue;
Doc zQc-U+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
9YI@c_1 Q {
*B3f ry SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
IIAp-Y~B bProcessed=TRUE;
qA '^b~ }
(n k g }
,&,%B|gT] }
h^(U:M=A else if((lParam&0xc000ffff)==1){ //有键按下
`e ZDG switch(wParam)
"#E
Z {
J~KO#` case VK_MENU:
_qE9]mU MaskBits|=ALTBIT;
%/3+:}@G break;
;cVK2' case VK_CONTROL:
rS>.!DiYr, MaskBits|=CTRLBIT;
,C6( break;
^!B]V>L- case VK_SHIFT:
Oey
Ph9^V MaskBits|=SHIFTBIT;
yr+QV:oVA break;
F2zo
!a8 default: //judge the key and send message
{qHQ_ _Bl break;
K-]) RIM }
p8 S~`fjV for(int index=0;index<MAX_KEY;index++){
#fF5O2E'3 if(hCallWnd[index]==NULL)
Ly(iq continue;
BW;@Gq@N if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
B4un6-<i {
}N9PV/a SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
D% *ww'mt0 bProcessed=TRUE;
9%kO%j,3 }
r4u,I<ZbH }
7J3A]>qU }
;L:UYhDbUx if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
8o:h/F for(int index=0;index<MAX_KEY;index++){
F
lVG, Z if(hCallWnd[index]==NULL)
JVg}XwR continue;
w)<.v+u.Y if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
$~q{MX&J SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
\0lQ1FrY //lParam的意义可看MSDN中WM_KEYDOWN部分
5q4wREh }
L2Cb/!z`c }
R}(Rv3>Xx }
&u9,|n]O9 return CallNextHookEx( hHook, nCode, wParam, lParam );
EQoK\.;
G~ }
;ZJ. 7t' r!w4Br0 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
Eva&FHRTY |9i[*] BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
vZQraY nJ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
z*VK{O)o IRLAsb3 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
WTD86A y z3=# LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
0{d)f1 {
fvta< if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
b!-=L&V {
;|\j][A //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
"&qAV'U SaveBmp();
a-#$T)mmfj return FALSE;
.,VLQbtg }
NHU5JSlB …… //其它处理及默认处理
Q-iBK*-w }
B !x6N" v"Bm4+c&0 OGH,K'l 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。
|pknaz Ta3* G 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。
7<:o4\q?m 0T@axQ[% 二、编程步骤
modem6#x' |d\1xTBLp 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";
_^?_Vb V~8]ag4 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
sWTa;Qi .LM|@OeaD! 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;
)`<&~>qp > B;YYj~f} 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;
B)d 4]]4\\ $qpW?<>,0 5、 添加代码,编译运行程序。
$BLd>gTzmv )yz)Fw|& 三、程序代码
L;Yn q<x tJ7tZ~Ak ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
p")"t`k7 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
_/ 5 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
=Y^K
#if _MSC_VER > 1000
%"#ydOy #pragma once
#
dUi[' #endif // _MSC_VER > 1000
jMX+uYx M #ifndef __AFXWIN_H__
S%?%06$ #error include 'stdafx.h' before including this file for PCH
@5??`n #endif
#l* w=D? #include "resource.h" // main symbols
aU.!+e%_ class CHookApp : public CWinApp
$E8}||d {
benqm ~{\ public:
b'4}=Xpn CHookApp();
GAs.?JHd // Overrides
rNm_w>bq // ClassWizard generated virtual function overrides
Oku7&L1 //{{AFX_VIRTUAL(CHookApp)
FUL'=Xo public:
1;,<UHF8N virtual BOOL InitInstance();
VV[Fb9W ; virtual int ExitInstance();
8X? EB6=c //}}AFX_VIRTUAL
RA){\~@wC //{{AFX_MSG(CHookApp)
[T3%Xt'4 // NOTE - the ClassWizard will add and remove member functions here.
Vvv;m 5. // DO NOT EDIT what you see in these blocks of generated code !
|NTqJ j //}}AFX_MSG
GUJ?6; DECLARE_MESSAGE_MAP()
lQRtsmZ0 };
4kK_S.& LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
yr.sfPnJK BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
e?o/H BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
}dU!PZ9N) BOOL InitHotkey();
DdeKZ)8 BOOL UnInit();
pz{ ]O_px #endif
zG%'Cw)8 n-GoG(s..b //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
#7YJ87<E #include "stdafx.h"
Da)_O JYE #include "hook.h"
[CAFh:o #include <windowsx.h>
: S-{a #ifdef _DEBUG
On[yL$? #define new DEBUG_NEW
W]>%*n #undef THIS_FILE
s._,IW;
static char THIS_FILE[] = __FILE__;
3".#nN #endif
l?xd3Z@7[ #define MAX_KEY 100
Zv8GrkK #define CTRLBIT 0x04
_1YC9} #define ALTBIT 0x02
4`o<e)c3 #define SHIFTBIT 0x01
q(2ZJn13f #pragma data_seg("shareddata")
g<$2#c} HHOOK hHook =NULL;
hdmKD0 UINT nHookCount =0;
C/9]TkX}q static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
: Hu{MN\ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
}{&;\^i static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
<LJb,l" static int KeyCount =0;
U+["b-c static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
8WKY 4nkj #pragma data_seg()
r{*BJi.b HINSTANCE hins;
yGV>22vv
M void VerifyWindow();
i
If?K%M7 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
b0x%#trA{ //{{AFX_MSG_MAP(CHookApp)
v}IhO~`uEq // NOTE - the ClassWizard will add and remove mapping macros here.
N9rAosO* // DO NOT EDIT what you see in these blocks of generated code!
z"Cyjmg" //}}AFX_MSG_MAP
ID{XZ END_MESSAGE_MAP()
8L6b:$Y3@C y(^\]-fE CHookApp::CHookApp()
Tv
5J {
i;29*" // TODO: add construction code here,
vWa\8y f // Place all significant initialization in InitInstance
RU>qj
*e }
F'B0\v= K(WKx7Kky^ CHookApp theApp;
6V#EEb LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
h b8L[ 4 {
?|\wJrM ] BOOL bProcessed=FALSE;
#ZP;] W if(HC_ACTION==nCode)
A<( DYd1H {
?a1pO#{Dg if((lParam&0xc0000000)==0xc0000000){// Key up
_,d<9 Y) switch(wParam)
Ji6.-[: {
,]Xn9W case VK_MENU:
'6*9pG- MaskBits&=~ALTBIT;
!DF5NAE break;
4x#tUzb; case VK_CONTROL:
E\p"% MaskBits&=~CTRLBIT;
V\l@_%D[(v break;
,@Kn@%?$ case VK_SHIFT:
qL[SwEc MaskBits&=~SHIFTBIT;
ZNL+w4 break;
KCH`=lX default: //judge the key and send message
~03MH' break;
M* {5> !\ }
,(f W0d# for(int index=0;index<MAX_KEY;index++){
j0(jXAc;UB if(hCallWnd[index]==NULL)
HIC!:| continue;
%&q}5Y4! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Bvh{|tP4 {
aUA)p}/: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
A5%$< bProcessed=TRUE;
gFTlP }
18Ju]U }
7T t!hf }
;Zr7NKs else if((lParam&0xc000ffff)==1){ //Key down
mZjpPlJ switch(wParam)
;K%/sIIke {
gU NWM^n case VK_MENU:
TY'61xWi MaskBits|=ALTBIT;
$em'H,*b3 break;
;oDr8a<A case VK_CONTROL:
XD't)B(q MaskBits|=CTRLBIT;
%H,s~IU break;
W8;!rFW case VK_SHIFT:
2i1xSKRYrD MaskBits|=SHIFTBIT;
+lhCF*@*N break;
U%[ye0@: default: //judge the key and send message
Dg{d^>T!_x break;
UT9u? }
HXztEEK6 for(int index=0;index<MAX_KEY;index++)
J_m@YkK {
vLyazVj.. if(hCallWnd[index]==NULL)
!6@ 'H4cb= continue;
g|7o1{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
cO5zg<wF {
;gD\JA SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
I0z 7bx bProcessed=TRUE;
~id:Rh>o }
Pd(_ }
PLMC<4$s }
VuH -> if(!bProcessed){
evYn} for(int index=0;index<MAX_KEY;index++){
i1-%#YYF( if(hCallWnd[index]==NULL)
( }Bb=~ continue;
jlFlhj:/I if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
o[iN/ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
]dI^
S }
't0M+_J }
`[U.BVP' }
x&0kIF'lq return CallNextHookEx( hHook, nCode, wParam, lParam );
a#;;0R $ }
}2Euz.0 2zW IB[ BOOL InitHotkey()
s.Ai_D {
w}zmcO:x if(hHook!=NULL){
Q}KOb4D nHookCount++;
&b}g.)RI return TRUE;
l:uQ#Z) }
$T^q>v2u else
6w,"i#E! hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
J{Kw@_ypP if(hHook!=NULL)
V-n{=8s nHookCount++;
p\lR1 return (hHook!=NULL);
dIlpo0; F }
\y]K]iv BOOL UnInit()
^jwzCo- {
>RAg63!` if(nHookCount>1){
^MF 2Q+ nHookCount--;
ce}A!v return TRUE;
'ET];iZ2 }
Kw"y#Ys] BOOL unhooked = UnhookWindowsHookEx(hHook);
Opc szq5n if(unhooked==TRUE){
7Y(Dg`8G nHookCount=0;
aaT3-][ hHook=NULL;
1p$(\ }
['.]) return unhooked;
3?]81v/ }
;M4[Liw~O x]x 3iFD BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
}RI_k&; {
GyN|beou BOOL bAdded=FALSE;
UNa"\ for(int index=0;index<MAX_KEY;index++){
pka^7OWyN if(hCallWnd[index]==0){
wTU$jd1;+ hCallWnd[index]=hWnd;
{L%J DJ HotKey[index]=cKey;
fJc( HotKeyMask[index]=cMask;
XxS#~J?:_ bAdded=TRUE;
uH%b rbrU KeyCount++;
LkS tU) break;
0lg'QG> }
=CK% Zo }
[1P_^.Htr return bAdded;
^]R_t@ }
ZF[W<Q vHcl7=)Q BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
s_IFl5D] {
*af\U3kx BOOL bRemoved=FALSE;
iIX%%r+ for(int index=0;index<MAX_KEY;index++){
bXF8V if(hCallWnd[index]==hWnd){
9d#?,:JG if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
~Dq-q6-@t hCallWnd[index]=NULL;
)LFbz#;Y HotKey[index]=0;
(l{8Ixs HotKeyMask[index]=0;
`+n#CWZ"Y bRemoved=TRUE;
fGlvum KeyCount--;
\#:
W break;
!<:Cd(bM }
K
$- * }
P(k*SB|D }
,5;M(ft# return bRemoved;
Z%3CmKdeF }
yC\UT
~j/ 5S!#^>_ void VerifyWindow()
|w|c!;, {
qr%N/7 for(int i=0;i<MAX_KEY;i++){
oLKliA=q if(hCallWnd
!=NULL){ k}fC58q
if(!IsWindow(hCallWnd)){ e3SnC:OWf
hCallWnd=NULL; )
~=pt&+
HotKey=0; zU&Iy_Ke.
HotKeyMask=0; gPk,nB
KeyCount--; J\*uW|=F
} _D{A`z
} D=z~]a31!
} '=E;^'Rl
} OXrm!'
V0,JTWc
BOOL CHookApp::InitInstance() I~n4}}9M
{ 3(V0,L'1
AFX_MANAGE_STATE(AfxGetStaticModuleState()); EO)JMV?6
hins=AfxGetInstanceHandle(); q1:dcxR[
InitHotkey(); S2'a i
return CWinApp::InitInstance(); JyE-c}I
} ZcXAqep8'
GbQi3%
int CHookApp::ExitInstance() ZEI)U,
I.
{ vEg%ivj3
VerifyWindow(); E42)93~C
UnInit(); pmB
{b
return CWinApp::ExitInstance(); "ZGP,=?y2
} t~o"x .
&f.|MNz;
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file :38{YCN
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) S3%2T
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ S~aWun
#if _MSC_VER > 1000 >1!u]R<3
#pragma once PSq?8.
#endif // _MSC_VER > 1000 ?P0b/g
e1W9"&4>G{
class CCaptureDlg : public CDialog +I3Vfv
{ vz4(
k/
// Construction 8C3oi&av/{
public: %evb.h)
BOOL bTray; Qz|T0\=V
BOOL bRegistered; b69nj
BOOL RegisterHotkey(); ?.`
ga*
UCHAR cKey; FM6{%}4
UCHAR cMask; M5WB.L[@q
void DeleteIcon(); 0V<kpC,4
void AddIcon(); LH4#p%Pb%
UINT nCount; P'8RaO&d
void SaveBmp(); j ^j"w(a
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7/~=[#]*
// Dialog Data myfTztJ
//{{AFX_DATA(CCaptureDlg) ( 5!'42
enum { IDD = IDD_CAPTURE_DIALOG }; y5eEEG6
CComboBox m_Key; 0L/chP
BOOL m_bControl; I;'{X_9$a
BOOL m_bAlt; ;EJ!I+
BOOL m_bShift; W_M#Gi/AL
CString m_Path; ExtC\(X;
CString m_Number; rgIWM"
//}}AFX_DATA gV.? Myy
// ClassWizard generated virtual function overrides n{TWdC
//{{AFX_VIRTUAL(CCaptureDlg) :L@;.s
public: hYzP6?K"
virtual BOOL PreTranslateMessage(MSG* pMsg); *S*49Hq7c
protected:
iKo2bC:.&
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support bss2<mqlH
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); QtnNc!,n
//}}AFX_VIRTUAL BmV`<Q,
// Implementation #l}Fk)dj
protected: >ZkL`!:s
HICON m_hIcon; m:)&:Y0 (a
// Generated message map functions }MOXJb @
//{{AFX_MSG(CCaptureDlg) 3zh:~w_
virtual BOOL OnInitDialog(); Dazm8_x
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); KE,.Evyu=
afx_msg void OnPaint(); K^<?LXJF
afx_msg HCURSOR OnQueryDragIcon(); !nl-}P,
virtual void OnCancel(); ;av!fK
afx_msg void OnAbout(); .Qrpz^wdt
afx_msg void OnBrowse(); `\VtTS
afx_msg void OnChange(); >niv>+!N
//}}AFX_MSG yP3I^>AZ3
DECLARE_MESSAGE_MAP() i
FZGfar?
}; WOj}+?/3 R
#endif _{'[Uf/l
"T=j\/Q
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ZS+m}.,whQ
#include "stdafx.h" +&7V@
#include "Capture.h" P0m9($JBD
#include "CaptureDlg.h" `_cv& "K9f
#include <windowsx.h> A<|9</9z
#pragma comment(lib,"hook.lib") 3}\ z&|
#ifdef _DEBUG IoOOS5a
#define new DEBUG_NEW ~v(c9I)
#undef THIS_FILE 2?7ID~\
static char THIS_FILE[] = __FILE__; Fb1<Ic#
#endif }i^M<A O
#define IDM_SHELL WM_USER+1 9 RDs`>v
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !k%
PP
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); T`@brL
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; H,TApF89A
class CAboutDlg : public CDialog M <JX
{ Ut2T:%m{
public: 3A^AEO
CAboutDlg(); >8{w0hh;
// Dialog Data TXM/+sd
//{{AFX_DATA(CAboutDlg) 0B8Wf/j?M
enum { IDD = IDD_ABOUTBOX }; hkl0N%[
//}}AFX_DATA kO}%Y?9d
// ClassWizard generated virtual function overrides ZgEV-.>P
//{{AFX_VIRTUAL(CAboutDlg) @,oc%m
protected: NpGi3>5
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I N3-ZNx
//}}AFX_VIRTUAL cr -5t4<jK
// Implementation ^@/wXj:
protected: .X3n9]
//{{AFX_MSG(CAboutDlg) Q0"?TSY
//}}AFX_MSG %Y0lMNP
DECLARE_MESSAGE_MAP() Z{vc6oj
}; 8!35
K
Ju#j%!
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1 .@{5f3T
{ sHPAr}14
//{{AFX_DATA_INIT(CAboutDlg) CC^]Y.9
//}}AFX_DATA_INIT (7<G1$:z=
} &iu]M=Yb
'2Zs15)V
void CAboutDlg::DoDataExchange(CDataExchange* pDX) X,+a 6F
{ *2/qm:gB
CDialog::DoDataExchange(pDX); 3c#^@Bj(-e
//{{AFX_DATA_MAP(CAboutDlg) hwUb(pZ
//}}AFX_DATA_MAP $W}:,]hoj
} <v9IK$J
KW'nW
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) U*{0, Ue'
//{{AFX_MSG_MAP(CAboutDlg) +pSo(e(
// No message handlers G)YmaHeI;[
//}}AFX_MSG_MAP M^\`~{*T
END_MESSAGE_MAP() OU` !c[O
vG6*[c8
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) au19Q*r9
: CDialog(CCaptureDlg::IDD, pParent) 4xT /8>v2|
{ k;<@2C
//{{AFX_DATA_INIT(CCaptureDlg) 0J[B3JO@M
m_bControl = FALSE; kK4+K74B
m_bAlt = FALSE; o_=4Ex
"
m_bShift = FALSE; VWt=9D;
m_Path = _T("c:\\"); h3E}Sa(MQ:
m_Number = _T("0 picture captured."); o1\N)%
nCount=0; eQyc<
bRegistered=FALSE; ?/T=Gk
bTray=FALSE; ;uc3_J]
//}}AFX_DATA_INIT O0r vr$.
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ?{ \7th37
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); \s)$[pAF
} Pbbi*&i
78:x{1nUM[
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 6qmV/DL
{ 5`&@3
m9/
CDialog::DoDataExchange(pDX); Tt{X(I} J
//{{AFX_DATA_MAP(CCaptureDlg) ;2`t0#J$]
DDX_Control(pDX, IDC_KEY, m_Key); !|V_DsP
DDX_Check(pDX, IDC_CONTROL, m_bControl); 4VvE(f
DDX_Check(pDX, IDC_ALT, m_bAlt); m4uh<;C~
DDX_Check(pDX, IDC_SHIFT, m_bShift); hFtjw6
DDX_Text(pDX, IDC_PATH, m_Path); L$"x*2[A
DDX_Text(pDX, IDC_NUMBER, m_Number); ~x4]p|)</
//}}AFX_DATA_MAP 7Q'u>o
} pUmT?N!
x]hG2on!
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Q~Nq5[
//{{AFX_MSG_MAP(CCaptureDlg) `=V1w4J
ON_WM_SYSCOMMAND() {=Ji2k0U'
ON_WM_PAINT() Nf* .r
ON_WM_QUERYDRAGICON() 8z|]{XW{
ON_BN_CLICKED(ID_ABOUT, OnAbout) #D(=[F
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) I4ZbMnO
ON_BN_CLICKED(ID_CHANGE, OnChange) Nk%$;Si
//}}AFX_MSG_MAP w(S&X"~
END_MESSAGE_MAP() ~#so4<A`3
.i?{h/9y
BOOL CCaptureDlg::OnInitDialog() .#sX|c=W
{ *'-C/
CDialog::OnInitDialog(); BuAzO>=
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); #68$'Rl"o1
ASSERT(IDM_ABOUTBOX < 0xF000); *
#z@b
CMenu* pSysMenu = GetSystemMenu(FALSE); dEkS T[Y3
if (pSysMenu != NULL) FncP,F$8
{ j5n"LC+oz
CString strAboutMenu; dKXzFyW
strAboutMenu.LoadString(IDS_ABOUTBOX); `B8`<3k/(
if (!strAboutMenu.IsEmpty()) xi<}n#
{ .*595SuF
pSysMenu->AppendMenu(MF_SEPARATOR); 1PWi~1q{Q
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); w .M
} MYxuQ |w
} =<#++;!I
SetIcon(m_hIcon, TRUE); // Set big icon .!2
u#A
SetIcon(m_hIcon, FALSE); // Set small icon g hkV^ [
m_Key.SetCurSel(0); D'D IC
RegisterHotkey(); JAMV@
CMenu* pMenu=GetSystemMenu(FALSE); 6_rgRo&
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .W;cz8te
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Xa"I
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); MR@Qn[RdM
return TRUE; // return TRUE unless you set the focus to a control ~EQ#
%db
} 8WQc8
|Q%nnN
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) hCX/k<}I
{ FL$S_JAw
if ((nID & 0xFFF0) == IDM_ABOUTBOX) NYxL7 :9
{ #IqRu:csp
CAboutDlg dlgAbout; "~K ph0-
dlgAbout.DoModal(); SuV3$-);z
} V=>]&95-f
else z}r
{ Ya<V@qd
CDialog::OnSysCommand(nID, lParam); Sy*p6DP
} wYS r.T8Q
} ^x(s!4d]
h y\iot
void CCaptureDlg::OnPaint() L&|^y8
{ lF7".
if (IsIconic()) 8{&.[SC7
{ vQoZk,
CPaintDC dc(this); // device context for painting , a2=OV
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); d?/g5[
// Center icon in client rectangle xA*6Z)Y
int cxIcon = GetSystemMetrics(SM_CXICON); Q!AGalP z
int cyIcon = GetSystemMetrics(SM_CYICON); *
+6Z^7
CRect rect; )C0Iy.N-
GetClientRect(&rect); GJ?J6@|
int x = (rect.Width() - cxIcon + 1) / 2; MQ'=qR
int y = (rect.Height() - cyIcon + 1) / 2; t="nmjQs
// Draw the icon XVKRT7U
dc.DrawIcon(x, y, m_hIcon); {?cF2K#
} kcNPdc
else 0d0ga^O
{ $(yi+v
CDialog::OnPaint(); @aB7dtM
} \m<$qp,n
} bXM&VW?OP
T$DFTr\\
HCURSOR CCaptureDlg::OnQueryDragIcon() ['6Sq@c)
{ YQ1rS X3
return (HCURSOR) m_hIcon; ).tTDZ
} vZqW,GDfXo
=|c7#GaiF
void CCaptureDlg::OnCancel() fNrpYR X
{ v>j<ky
if(bTray) Io/;+R.
DeleteIcon(); |$GPJaNqa
CDialog::OnCancel(); u0Z MrIJ
} Pvm pWa
],zp~yVU&
void CCaptureDlg::OnAbout() szOa yAS
{ T#Z#YM k
CAboutDlg dlg; #! (2@N8
dlg.DoModal(); <c,iu{:
} {XnBj}C
aCfWbJ@qiG
void CCaptureDlg::OnBrowse() M pz9}[`3g
{ [_C([o'\KY
CString str; {s2eOL5I|%
BROWSEINFO bi; 4Le{|B
char name[MAX_PATH]; )~w
bu2;
ZeroMemory(&bi,sizeof(BROWSEINFO)); 7G Jhc
bi.hwndOwner=GetSafeHwnd(); mF>{cVTF
bi.pszDisplayName=name; |g<l|lqz|
bi.lpszTitle="Select folder"; IY@N
bi.ulFlags=BIF_RETURNONLYFSDIRS; lvR>%I0`*
LPITEMIDLIST idl=SHBrowseForFolder(&bi); T!1XL7
if(idl==NULL) EgOiJH
return; 5E${
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); h~=~csya:
str.ReleaseBuffer(); a,xy38T<
m_Path=str; L*{E-m/
if(str.GetAt(str.GetLength()-1)!='\\') :{-/b
m_Path+="\\"; $o
;48uV^
UpdateData(FALSE); GCxmqoQ
} h,MaF<~
zpcO7AY~
void CCaptureDlg::SaveBmp() rFW,x_*_vP
{ 6""i<oR
CDC dc; QghL=
dc.CreateDC("DISPLAY",NULL,NULL,NULL); @Fb
2c0?Y
CBitmap bm; D@
BP<
int Width=GetSystemMetrics(SM_CXSCREEN); #V@vz#bo=
int Height=GetSystemMetrics(SM_CYSCREEN); 1E$^ul-v
bm.CreateCompatibleBitmap(&dc,Width,Height); c$;Cpt@-j
CDC tdc; NU3s^ 8\(
tdc.CreateCompatibleDC(&dc); 0.^67'
CBitmap*pOld=tdc.SelectObject(&bm); }#Kl6x
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); MX|@x~9W
tdc.SelectObject(pOld); OXV9D:bIa
BITMAP btm; uLt31G()
bm.GetBitmap(&btm); \?$kpV
DWORD size=btm.bmWidthBytes*btm.bmHeight; 2KNs,4X@
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); R]d934s
BITMAPINFOHEADER bih; [-nPHmZV[
bih.biBitCount=btm.bmBitsPixel; fTi5Ej*/?)
bih.biClrImportant=0; @CA{uP;
bih.biClrUsed=0; Fw%S%*B8g
bih.biCompression=0; GP=bp_L
bih.biHeight=btm.bmHeight; z2;<i|Ez0
bih.biPlanes=1; Co:Rg@i(F
bih.biSize=sizeof(BITMAPINFOHEADER); 8@KGc
)k
bih.biSizeImage=size; lt{"N'Gw6
bih.biWidth=btm.bmWidth; pH396GFIW
bih.biXPelsPerMeter=0; @-O%u*%J
bih.biYPelsPerMeter=0; 7fW$jiw
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 41i#w;ojI
static int filecount=0; 6KX/Yj~B
CString name; n7bML?f'
name.Format("pict%04d.bmp",filecount++); |bk$VT4\
name=m_Path+name; p$$0**p!`
BITMAPFILEHEADER bfh; Qt=OiKZ
bfh.bfReserved1=bfh.bfReserved2=0; PC& (1kJ
bfh.bfType=((WORD)('M'<< 8)|'B'); &hIr@Gi@ch
bfh.bfSize=54+size; s<8|_Dt
bfh.bfOffBits=54; gV-A+;u
CFile bf; >NtJ)N*
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 9Hs5uBe
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^7Z.~A y
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 7"Q;Yi2(
bf.WriteHuge(lpData,size); >2#F5c67
bf.Close(); P A$jR
fQ
nCount++;
R7Z!
} Ym9~/'%]
GlobalFreePtr(lpData); 3moDu
if(nCount==1) =la~D]T*g
m_Number.Format("%d picture captured.",nCount); y~py+:_
else ;sY n=r
m_Number.Format("%d pictures captured.",nCount); B{7hRk.5!
UpdateData(FALSE); Tuy5h5
} :Mq{ES%
+LaR_n[
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) R(#ZaFuo[
{ +w(B9rH
if(pMsg -> message == WM_KEYDOWN) A7zL\U4
{ ev z@c)8
if(pMsg -> wParam == VK_ESCAPE) JQA]O/|N
return TRUE; XK/bE35%^!
if(pMsg -> wParam == VK_RETURN) {A{sRT=%
return TRUE; *^p^tK
} _k Utj(re
return CDialog::PreTranslateMessage(pMsg); q'`LwAU}
} Z<[:v2
@"/:Omh
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dEPLkv
{ +sx$%N
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ulNMqz\.
SaveBmp(); NoT%z$1n
return FALSE; SF[}suL
} u Qz!of%x
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ fmv,)UP
CMenu pop; ]eo%eaA
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;AJ6I*O@+
CMenu*pMenu=pop.GetSubMenu(0); J(Zz^$8]<?
pMenu->SetDefaultItem(ID_EXITICON); o}y(T07n
CPoint pt; l|K$6>80
GetCursorPos(&pt); .hK:-q,
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); C\}M_MD
if(id==ID_EXITICON) yG,uD!N]|
DeleteIcon(); gh.+}8="
else if(id==ID_EXIT) lF3wTf/j
OnCancel(); TECp!`)j"
return FALSE; Dh)(?"^9A
} 'oF ('uR
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 5GDg_9Bz
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) aJ
J63aJ
AddIcon(); axz.[L_elB
return res; yhd]s0(!
} o8N,mGj}
ricL.[v9S
void CCaptureDlg::AddIcon() Y
{|is2M9'
{ /NQ
PTr
NOTIFYICONDATA data; R ^@
data.cbSize=sizeof(NOTIFYICONDATA); +3]V>Mv
CString tip; v>0} v)<v
tip.LoadString(IDS_ICONTIP); '8;'V%[+
data.hIcon=GetIcon(0); G$;cA:p-j
data.hWnd=GetSafeHwnd(); P
4+}<5
strcpy(data.szTip,tip); F[]6U/g n
data.uCallbackMessage=IDM_SHELL; /&zlC{:G92
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _3q}K
data.uID=98; I8{
mk h
Shell_NotifyIcon(NIM_ADD,&data); DC2[g9S>8@
ShowWindow(SW_HIDE); 06[HE7
bTray=TRUE; Y-~MkB
} >O~
@x_0AkZU
void CCaptureDlg::DeleteIcon() -!IeP]n#P
{ 3(_:"?x A
NOTIFYICONDATA data; 3e)$ <e
data.cbSize=sizeof(NOTIFYICONDATA); x@tI
data.hWnd=GetSafeHwnd(); b fI= =
data.uID=98; $.zd,}l@L
Shell_NotifyIcon(NIM_DELETE,&data); 3zMaHh)mj
ShowWindow(SW_SHOW); %<<JWoB
SetForegroundWindow(); C@u}tH
)
ShowWindow(SW_SHOWNORMAL); `@ 8O|j
bTray=FALSE; "%#CMCE|f
} m+xub*/
RM>A9nv$\
void CCaptureDlg::OnChange() :-oMkBS
{ e <+b?@}=B
RegisterHotkey(); @Y!B~
} cJzkA^T9
*/4hFD {
BOOL CCaptureDlg::RegisterHotkey() 3ej[
{ A[m<xtm5K
UpdateData(); v1=N?8Hz1
UCHAR mask=0; M,<UnAVP-
UCHAR key=0; |\W~+}'g~
if(m_bControl) ZtY?X- 4_
mask|=4; -FW^fGS+
if(m_bAlt) :"cKxd
mask|=2; .9vt<<Kwh
if(m_bShift) k+~2
vmS
mask|=1; 8Z3:jSgk
key=Key_Table[m_Key.GetCurSel()]; 9U Hh#
if(bRegistered){ _}.WRFIJ@L
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ua,!kyS
bRegistered=FALSE; Ok<,_yh
} 25<qo{
cMask=mask; 1 ]ePU8
cKey=key; 3AAciMq}
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ~zVe?(W
return bRegistered; \{v-Xe&d^
} gH*(1*
^DVryeLD
四、小结 rU|?3x
p-H}NQ\
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。