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:
" Y%fk/v8
:1>h,NKC> 一、实现方法
=geopktpf H(L.k;B 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:
?4k/V6n@y .|\}]O` #pragma data_seg("shareddata")
~quof> HHOOK hHook =NULL; //钩子句柄
'q3<R%^Q UINT nHookCount =0; //挂接的程序数目
_C`&(?} static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
z$64Ep# static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
+D7>$&BD static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
x*H,eY3 static int KeyCount =0;
* {avx static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
8
5 L< #pragma data_seg()
GkwdBy+ /!7 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。
bsuGZ z):LF< 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:
b/[$bZD5o v2w|?26Lf BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
eILdq* cKey,UCHAR cMask)
^/6LVB * {
#VM+.75o1 BOOL bAdded=FALSE;
77 g<`}{ for(int index=0;index<MAX_KEY;index++){
[3K& cX}B if(hCallWnd[index]==0){
pc/x&VY% hCallWnd[index]=hWnd;
\#50;
8VJ HotKey[index]=cKey;
~F [V HotKeyMask[index]=cMask;
[TX1\*W bAdded=TRUE;
mafnkQU KeyCount++;
Z
"mqH break;
6!39t }
NUO#[7OK+x }
CvOji1 return bAdded;
'6g;UOx^= }
(YV]T!q //删除热键
qjr:(x / BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
S_eD1iY2- {
PJfADB7Y BOOL bRemoved=FALSE;
Y0z)5),[U: for(int index=0;index<MAX_KEY;index++){
8SZZ_tS3r if(hCallWnd[index]==hWnd){
hkpS}*L9o if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
uSsP'qd hCallWnd[index]=NULL;
MnLo{G] HotKey[index]=0;
*x!j:/S`n HotKeyMask[index]=0;
B~ ?R 6 bRemoved=TRUE;
h5)4Z^n KeyCount--;
a!@(bb
z> break;
|
)No4fm }
XWq`MwC9 }
}HCt=W` }
EpW89X return bRemoved;
X-4(oE }
iv!; gMco +X%pUe
l;;,[xhq DLL中的钩子函数如下:
_^Z
v[P
2S LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
7+NBcZuG9 {
awU!3)B BOOL bProcessed=FALSE;
E8/Pi>QW if(HC_ACTION==nCode)
BT^Im=A {
qdPmTaak if((lParam&0xc0000000)==0xc0000000){// 有键松开
W-RqooEv switch(wParam)
lRANXM {
/Moyn"Kj{ case VK_MENU:
v) j3YhY MaskBits&=~ALTBIT;
H'"=C&D~ break;
Hg~8Td** case VK_CONTROL:
>qy$W4 MaskBits&=~CTRLBIT;
j'uzjs[ break;
]\1H=g%Ou case VK_SHIFT:
l NLa:j MaskBits&=~SHIFTBIT;
H2S/!Q;K break;
$jg~a default: //judge the key and send message
]>/oo =E break;
"8$Muwm }
jX7;hQ+P for(int index=0;index<MAX_KEY;index++){
swz)gh-* if(hCallWnd[index]==NULL)
5E#8F continue;
D nl|B\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}~v& {
a9uMgx} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
rDWwu' bProcessed=TRUE;
/EW=OZ/ }
Wh)>E!~9 }
%oOSmt }
v t_lM else if((lParam&0xc000ffff)==1){ //有键按下
I]z4}#+cX switch(wParam)
hg7_ZjO {
B)x^S
> case VK_MENU:
3:aj8F2 MaskBits|=ALTBIT;
!lL~#l:F break;
"sSY[6Kp! case VK_CONTROL:
e>UU/Ks MaskBits|=CTRLBIT;
~}_S]^br break;
yR% l[/ X case VK_SHIFT:
6T5\zInd MaskBits|=SHIFTBIT;
)GfL?'Z break;
sB*!Nf^y default: //judge the key and send message
v'Pbx break;
1j]vJ4R_\ }
rMoz+{1A for(int index=0;index<MAX_KEY;index++){
uovSe4q5q if(hCallWnd[index]==NULL)
*m8{yh continue;
s$kvLy< if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
SN 4JX {
-C2[ZP- SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
sk5B} - bProcessed=TRUE;
zWrynJ}s }
L0R$T=~%) }
9JqT"zj }
]*X z~Ox2 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
x9o(q`N for(int index=0;index<MAX_KEY;index++){
*^iSP(dg if(hCallWnd[index]==NULL)
Xb~i?T;f continue;
Elt"tJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
k*rG^imX SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
j|>^wB //lParam的意义可看MSDN中WM_KEYDOWN部分
\8)FVpS }
.)E1|U[L }
(~NR."s; }
OD~yIV return CallNextHookEx( hHook, nCode, wParam, lParam );
uvRX{q4 }
Eb8~i_B- I%jlM0ZUI" 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:
ub2B!6f a Ml,in49
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
iX6*OEl/Q BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
@,{Qa!A>l ;D<;pW 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:
VFK]{!C_ jFl!<ooCo LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
T3Sz<K$E {
pI1g<pe if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
qN^]`M[ BY {
zhe~kI //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
!Ld[`d.|R! SaveBmp();
},;Z<( return FALSE;
[M#(su0fv }
n0)y|B# …… //其它处理及默认处理
y,6KU$G }
}((P)\s ~"Su2{"8B tlYB'8bJY 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。
N+vsQ!Qz W!|l_/L' 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。
sT,*<^ ";upu 二、编程步骤
xg4wtfAbS |+Xh ^E 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";
+fHqGZ] 94?/Rhs5 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
mln%Rd6u/ S3Fj /2Q8 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;
s~A:*2 \ F5+!Gb En 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;
KvjH\;78 \1eWI 5、 添加代码,编译运行程序。
YXg^t$ !{ !(yP_ 三、程序代码
<.ZD.u vvLzUxV ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
u~!Pzz3" #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
\Hu?K\SWs #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
bV:MOj^ #if _MSC_VER > 1000
}vZTiuzC #pragma once
KDr)'gl& #endif // _MSC_VER > 1000
16"L;r #ifndef __AFXWIN_H__
k;<F33v;Mh #error include 'stdafx.h' before including this file for PCH
xv7nChB #endif
/px`FuJI( #include "resource.h" // main symbols
wsj5;(f+ class CHookApp : public CWinApp
)o;n2T#O {
F<O<=Ww public:
=%{E^z>1 CHookApp();
SJlL!<i$ // Overrides
XcKyrh;i // ClassWizard generated virtual function overrides
G{.A5{ //{{AFX_VIRTUAL(CHookApp)
Hiih$O+ public:
9 LUk[V virtual BOOL InitInstance();
+WvW#wpH virtual int ExitInstance();
7'7o^>
! //}}AFX_VIRTUAL
?Hbi[YD //{{AFX_MSG(CHookApp)
lWFm>DiLY // NOTE - the ClassWizard will add and remove member functions here.
3V/f-l]X/ // DO NOT EDIT what you see in these blocks of generated code !
^t[br6G //}}AFX_MSG
2\#~%D>[ DECLARE_MESSAGE_MAP()
xw3A |Aj?r };
T'7x,8&2| LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
R7Ns5s3X BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
N8Un42 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
`nL^]i BOOL InitHotkey();
S/6I9zOP BOOL UnInit();
+}C M2>M #endif
G 'CYvV %sS7o3RW\ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
zU#
OjvNk #include "stdafx.h"
HqA3.<=F, #include "hook.h"
!<^`Sx/+ #include <windowsx.h>
; zfBe%Uf #ifdef _DEBUG
J|b:Zo9<f" #define new DEBUG_NEW
9-?kamA #undef THIS_FILE
u
&{|f static char THIS_FILE[] = __FILE__;
Rp.FG #endif
:LB< z#M #define MAX_KEY 100
m
A|" #define CTRLBIT 0x04
cKAZWON8;v #define ALTBIT 0x02
j*jq2u #define SHIFTBIT 0x01
u_S>`I #pragma data_seg("shareddata")
"HbrYYRb'
HHOOK hHook =NULL;
s`,. & UINT nHookCount =0;
fQ,(,^!; static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
9'!I6;M static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
4\Cb4jq%/ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
[mQ*];GA static int KeyCount =0;
^Cn_
ODjo static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
[oS.B\Vc #pragma data_seg()
}u~r.= HINSTANCE hins;
y{\(|j void VerifyWindow();
}{e7wqS$&, BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
G$
Ii //{{AFX_MSG_MAP(CHookApp)
\4&FW|mx // NOTE - the ClassWizard will add and remove mapping macros here.
Gp))1b'; // DO NOT EDIT what you see in these blocks of generated code!
?[q.1O //}}AFX_MSG_MAP
&?7+8n&+ END_MESSAGE_MAP()
}UHoa B9h> CHookApp::CHookApp()
S?m4 {
.:jfNp~jt // TODO: add construction code here,
[u`9R<>c"U // Place all significant initialization in InitInstance
FZtILlw }
cH$Sk D\V
(r\i CHookApp theApp;
"zN]gz=OV> LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
)IZ~!N|-w {
6b#J!:? BOOL bProcessed=FALSE;
cx(b5Z if(HC_ACTION==nCode)
#FV `*G
{
%GDs/9 if((lParam&0xc0000000)==0xc0000000){// Key up
Gnmxp%&}P| switch(wParam)
Yim` 3>#t {
eVy\)dCsU case VK_MENU:
?HaUT(\j MaskBits&=~ALTBIT;
+0O^!o break;
^7%
KS case VK_CONTROL:
B\Y!5$ MaskBits&=~CTRLBIT;
%+Khj@aX break;
4U1"F 7' case VK_SHIFT:
{piZm12q? MaskBits&=~SHIFTBIT;
kzb1iBe 6m break;
iG;GAw|E default: //judge the key and send message
Xa32p_|5~ break;
@Y2&v956 }
]Q\/si& for(int index=0;index<MAX_KEY;index++){
?{I]!gI if(hCallWnd[index]==NULL)
zbL6TP@= continue;
t^1c^RpTb if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Cdd
+I5~ {
5%6r,?/7KM SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
lGP'OY"Q bProcessed=TRUE;
UBxQ4)% }
!'EE8Tp~F }
$:MO/Suz{ }
.EUOKPK4W else if((lParam&0xc000ffff)==1){ //Key down
G|Y9F|.! switch(wParam)
UZ+FV;< {
SpUcrK;1 case VK_MENU:
JMq00_ MaskBits|=ALTBIT;
Px))O&w{ break;
ROHr%'owgL case VK_CONTROL:
-!]dU`:(X MaskBits|=CTRLBIT;
nY<hfqof break;
(S#4y case VK_SHIFT:
nfMQ3KP MaskBits|=SHIFTBIT;
8"g.Z* break;
e
RjpR?!\ default: //judge the key and send message
)v67wn*1A break;
i;$'haK< }
*u%4]q for(int index=0;index<MAX_KEY;index++)
4!dN^;Cb {
pB;p\9A*q if(hCallWnd[index]==NULL)
jE{2rw$ZJ? continue;
l`R/WC if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
K-nf@o+ {
hOSkxdi*^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
(9J,Qs[; bProcessed=TRUE;
cEd!t6Z }
]='E&=nc }
{<- BU[H }
O5Xu(q5+ if(!bProcessed){
{^#62Y for(int index=0;index<MAX_KEY;index++){
x1kb]0s<- if(hCallWnd[index]==NULL)
DN@T4!
continue;
]S~Z8T-[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
mSzBNvci SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
&V&0kp@+ }
0iX;%SPYz }
\Podyh/;? }
^.J
F?2T/ return CallNextHookEx( hHook, nCode, wParam, lParam );
b!ZXQn3X< }
ODH@/ n(b(H`1n BOOL InitHotkey()
##!)}i {
wKCHG/W if(hHook!=NULL){
y$At$i>u nHookCount++;
XY8s \DK return TRUE;
5u\si4 BL{ }
5"5D( else
( {H5k'' hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Rt<8&.m4 if(hHook!=NULL)
t "J"G@1) nHookCount++;
zZ|Si return (hHook!=NULL);
1;[\xqJ }
o~F @1 BOOL UnInit()
q@p-)+D; {
!\H!9FR if(nHookCount>1){
_e=R[ nHookCount--;
tw]RH(g+# return TRUE;
?s("@dz_ }
d"|XN{ BOOL unhooked = UnhookWindowsHookEx(hHook);
oO|zRK1;/ if(unhooked==TRUE){
gaC^<\J nHookCount=0;
u><gmp& hHook=NULL;
,iU ]zN// }
HZdmL-1Z^+ return unhooked;
_Va!Ky
=] }
*/n)_ +!V*{<K BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
/)xG%J7H {
u|7d_3 :: BOOL bAdded=FALSE;
i=-zaboo for(int index=0;index<MAX_KEY;index++){
4XDR?KUM if(hCallWnd[index]==0){
9
I> 3p4] hCallWnd[index]=hWnd;
@#}9?>UV HotKey[index]=cKey;
vS:%(Y"!< HotKeyMask[index]=cMask;
h@T}WZv bAdded=TRUE;
7{:| ) KeyCount++;
R R><so% break;
*lg1iP{] }
Zg|z\VR }
Z^>[{|lIA return bAdded;
m u(HNj }
%lchz/ W 0Q-&4 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
X|H%jdta {
su(y*187A BOOL bRemoved=FALSE;
0iW]#O/ for(int index=0;index<MAX_KEY;index++){
&eT)c<yhyK if(hCallWnd[index]==hWnd){
'N],d&fu^^ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Uq&ne1 hCallWnd[index]=NULL;
@YP\!#"8 HotKey[index]=0;
f8)D| HotKeyMask[index]=0;
b1jh2pG(V bRemoved=TRUE;
0i9y-32- KeyCount--;
jNV2o break;
'z2}qJJ) }
UnZ*"% }
}.7!@!q. }
0%}$@H5i return bRemoved;
_n2PoE:5@P }
@<\f[Znto Y2j>lf?8 void VerifyWindow()
<oPo?r|oM| {
n6[bF"v for(int i=0;i<MAX_KEY;i++){
r^&{0c&o if(hCallWnd
!=NULL){ 46*o_A,"
if(!IsWindow(hCallWnd)){ tn;e
PcU
hCallWnd=NULL; 6z"fBF
HotKey=0; 0X -u'=Bs
HotKeyMask=0; <FMW%4
KeyCount--; ` &|Rs
} z?h\7
R
} J}TS-j0
} ;k/y[ x}
} ^v3ytS
)ye[R^!}
BOOL CHookApp::InitInstance() ^DVr>u
{ GdR>S('
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 9'Y~! vY
hins=AfxGetInstanceHandle(); FqQm*k_
InitHotkey(); SZ~Ti|^
return CWinApp::InitInstance(); LDW":k|
} A7
.[OC
t
qbS!r
int CHookApp::ExitInstance() TvAA
{ rOB-2@-
VerifyWindow(); xzy7I6X
UnInit(); ,Vt7Kiu
return CWinApp::ExitInstance(); ' G-]>
} c}Y(Myd
UMo=bs
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file abWmPi
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) rZe"*$e
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ IO`.]iG
#if _MSC_VER > 1000 >f19P+
#pragma once ;Mc\>i/
#endif // _MSC_VER > 1000 75@){ :
!~m)_Q5?~
class CCaptureDlg : public CDialog tk<dp7y7
{ -Duy:C6W
// Construction +%6{>C+bZo
public: S3:Pjz}t
BOOL bTray; 0(ZER sP
BOOL bRegistered; <m`HK.|~
BOOL RegisterHotkey(); I_'S|L
UCHAR cKey; }-)2CEj3L%
UCHAR cMask; [U]*OQH`e
void DeleteIcon(); uezqC=v$h
void AddIcon(); 85m[^WGyh
UINT nCount; v@LK3S/!3
void SaveBmp(); >yg mE`g
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 9cWl/7;zXO
// Dialog Data WcPDPu~/
//{{AFX_DATA(CCaptureDlg) ,JN2q]QPP
enum { IDD = IDD_CAPTURE_DIALOG }; fg%I?ou
CComboBox m_Key; "QA#
BOOL m_bControl; lOPCM1Se
BOOL m_bAlt; wS <d8gw
BOOL m_bShift; S$+vRX7
CString m_Path; nE+sbfC
CString m_Number; A0cC)bd&
//}}AFX_DATA /0d_{Y+9
// ClassWizard generated virtual function overrides IaH8#3+a
//{{AFX_VIRTUAL(CCaptureDlg) 2+TCFpv
public: 8V;@yzIha
virtual BOOL PreTranslateMessage(MSG* pMsg); 3)T'&HKQ
protected: 8*H-</ =
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support OlK3xdg7
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); VThcG(
NF
//}}AFX_VIRTUAL U voX\
// Implementation dZIAotHN:
protected: >:Na^ +c
HICON m_hIcon; s&iM.[k
// Generated message map functions 4v33{sp
//{{AFX_MSG(CCaptureDlg) BdG~y1%:
virtual BOOL OnInitDialog(); "2i{ L '
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); VtUe$ft
afx_msg void OnPaint(); Y
_m4:9p
afx_msg HCURSOR OnQueryDragIcon(); _~&6Kb^*
virtual void OnCancel(); 9s6@AJf
afx_msg void OnAbout(); II3)Cz}xRG
afx_msg void OnBrowse(); $/Gvz)M
afx_msg void OnChange(); VJDF/)X3$
//}}AFX_MSG >E|@3g
+2
DECLARE_MESSAGE_MAP() GRB/N1=
}; `$ZX]6G
#endif Y|_#yb
^&zwO7cS
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ,G!M?@Q
#include "stdafx.h" P(_D%0xKm
#include "Capture.h" &dh%sFy
#include "CaptureDlg.h" n`2d
#include <windowsx.h> |Up+Kc:z/n
#pragma comment(lib,"hook.lib")
7"2L|fG
#ifdef _DEBUG 8B JxD<
#define new DEBUG_NEW J_C<Erx[O
#undef THIS_FILE (8TB*BhQ_
static char THIS_FILE[] = __FILE__; 53J!iNnXT6
#endif WW{5[;LYiB
#define IDM_SHELL WM_USER+1 o%i^t4J$e
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); PBbJfm
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yQ}$G
,x
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; l)[\TD
class CAboutDlg : public CDialog n1 =B
{ T1m"1Q
public: QM2Y?."#
CAboutDlg(); ;n%SjQ'%
// Dialog Data 8>x!n/z)
//{{AFX_DATA(CAboutDlg) '3 w=D
)
enum { IDD = IDD_ABOUTBOX }; u =z$**M^
//}}AFX_DATA :6S!1roi
// ClassWizard generated virtual function overrides 1 !bODd
//{{AFX_VIRTUAL(CAboutDlg) Y ( x_bJ
protected: U&yXs'3a&
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .+MJ' bW
//}}AFX_VIRTUAL <+o-{{E[
// Implementation jl;_lcO
protected: rL3<r
//{{AFX_MSG(CAboutDlg) mEfI2P)#|
//}}AFX_MSG ;,[6 n|M
DECLARE_MESSAGE_MAP() z6ISJb
}; ']Gqa$(YC
XAwo~E
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) oGM Ls
{ A-^[4&rb
//{{AFX_DATA_INIT(CAboutDlg) Q1jU{
//}}AFX_DATA_INIT Ig}G"GR
} lT#&\JQ
!O6e,l
void CAboutDlg::DoDataExchange(CDataExchange* pDX) '9c`[^
{ GL[#XB>n
CDialog::DoDataExchange(pDX); 4z#{nZG
//{{AFX_DATA_MAP(CAboutDlg) 3sIW4Cs7)U
//}}AFX_DATA_MAP MGze
IrV
} usH9dys,
I_6NY,dF
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) R''nZ/R
//{{AFX_MSG_MAP(CAboutDlg) S-}MS"
// No message handlers g@wF2=
//}}AFX_MSG_MAP R*a5bKr
END_MESSAGE_MAP() #"-?+F=rk
5Ds/^fA
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 0D/u`-
: CDialog(CCaptureDlg::IDD, pParent) (|)`~z
{ 6zh<PETa03
//{{AFX_DATA_INIT(CCaptureDlg) lffp\v{w
m_bControl = FALSE; Hy^Em
m_bAlt = FALSE; ;*1bTdB5a
m_bShift = FALSE; uPKq<hBI
m_Path = _T("c:\\"); <_$]!Z6UR
m_Number = _T("0 picture captured."); ?j;e/r.
nCount=0; XI:8_F;Q
bRegistered=FALSE; pd{W(M78g
bTray=FALSE; K]ob>wPf
//}}AFX_DATA_INIT nwswy]e8/
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 hTcy;zLLS
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); =+5z;3
}
A]ZCQ49
:f%FM&b
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) DX GClH
{ VN[C%C
CDialog::DoDataExchange(pDX); 59mNb:<
//{{AFX_DATA_MAP(CCaptureDlg) K~ ,|~
DDX_Control(pDX, IDC_KEY, m_Key); ZycV?ob8}
DDX_Check(pDX, IDC_CONTROL, m_bControl); s3qWTdM
DDX_Check(pDX, IDC_ALT, m_bAlt); x2x)y08
DDX_Check(pDX, IDC_SHIFT, m_bShift); JYuI~<:
DDX_Text(pDX, IDC_PATH, m_Path); E}AOtY5a
DDX_Text(pDX, IDC_NUMBER, m_Number); 2 w\$}'
//}}AFX_DATA_MAP J@D5C4>i
} #[0:5$-[
?3X!
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) y6NOHPp@
//{{AFX_MSG_MAP(CCaptureDlg) ie|I*;#
ON_WM_SYSCOMMAND() fHhm)T8KB
ON_WM_PAINT() RapHE; <
ON_WM_QUERYDRAGICON() F}3<q
ON_BN_CLICKED(ID_ABOUT, OnAbout) !`=ms1%U
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) e9e%8hL
ON_BN_CLICKED(ID_CHANGE, OnChange) KiW4>@tY
//}}AFX_MSG_MAP e~R;
2bk
END_MESSAGE_MAP() ASmMj;>UM
<"A|Xv'Q
BOOL CCaptureDlg::OnInitDialog() ^?PU:eS
{ Z0&^U#]
CDialog::OnInitDialog(); S^q)DuF5!
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); +v4P9V|s
ASSERT(IDM_ABOUTBOX < 0xF000); w1HE^
/
CMenu* pSysMenu = GetSystemMenu(FALSE); rt">xVl
if (pSysMenu != NULL) 7pMl:\
{ 3 i<,#FaL
CString strAboutMenu; ?xEQ'(UBQ
strAboutMenu.LoadString(IDS_ABOUTBOX); /~3~Xc~=p
if (!strAboutMenu.IsEmpty()) !Ic;;<
{ 4;"^1 $
pSysMenu->AppendMenu(MF_SEPARATOR); r_C|gfIP
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0\v98g<[+
} )006\W|t9
} W}m-5L
SetIcon(m_hIcon, TRUE); // Set big icon ! |SPOk
SetIcon(m_hIcon, FALSE); // Set small icon 3jF#f'*
m_Key.SetCurSel(0); q-s! hiK
RegisterHotkey(); Ci%u =%(
CMenu* pMenu=GetSystemMenu(FALSE); o?nlnoe
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); M|!^ #!a(
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); kk]f*[Zi5
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); }OY]mAv-B
return TRUE; // return TRUE unless you set the focus to a control H.-jBFt}
} ~RcI+jR)
5/x"!Jk
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Rs+rlJq
{ BiGB<Jr
if ((nID & 0xFFF0) == IDM_ABOUTBOX) p@epl|IZp
{ 50!/%
CAboutDlg dlgAbout; w-2&6o<n-
dlgAbout.DoModal(); QZy+`
} |GuIp8~
else we'<Y
{ D|-^}I4
CDialog::OnSysCommand(nID, lParam); x._IP,vRx^
} sYV7t*l
} []HMUL]"
!iKR~&UpAL
void CCaptureDlg::OnPaint() u] C/RDTH
{ TymE(,1
if (IsIconic()) hUirvDvX
{ rM<lPMr1*
CPaintDC dc(this); // device context for painting Bvzu{B%
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 6#~"~WfPQ
// Center icon in client rectangle tX;00g;U.
int cxIcon = GetSystemMetrics(SM_CXICON); o(xRq;i
int cyIcon = GetSystemMetrics(SM_CYICON); #_yQv? J
CRect rect; rfqw/o
GetClientRect(&rect); xdWfrm$;ZA
int x = (rect.Width() - cxIcon + 1) / 2; @$FE}j_
int y = (rect.Height() - cyIcon + 1) / 2; |1^>n,C
// Draw the icon _^4\z*x
dc.DrawIcon(x, y, m_hIcon); 1*S5:7Tb
} p:M#F:
else <hi@$.u_Q^
{ 1-Fg_G}|6
CDialog::OnPaint(); !:e|M|T'I*
} Hw"ik6
} "|W .o=R
4R!A.N 9
HCURSOR CCaptureDlg::OnQueryDragIcon() WelB+P2
{ hoxn! x$?
return (HCURSOR) m_hIcon; X!5N2x
} b i^h&H
g*b
4N_
void CCaptureDlg::OnCancel() 9 tZ)#@\
{ 9xWC<i
if(bTray) KDwz!:ye
DeleteIcon(); d_9Fc"C~
CDialog::OnCancel(); "%~\kJ(G
} v +-f
pl&
ps0wN%tA
void CCaptureDlg::OnAbout() f`<j(.{9F
{ _3$@s{k-TI
CAboutDlg dlg; }qfr&Ffh@
dlg.DoModal(); ]D^ dQ%{
} 'Z2:u!E
r})2-3ZA9
void CCaptureDlg::OnBrowse() gA
]7YHc
{ zx^]3}
CString str; h}xUZ:
BROWSEINFO bi; #1R_*
Uh
char name[MAX_PATH]; }aYm86C]
ZeroMemory(&bi,sizeof(BROWSEINFO)); H"(:6
`
bi.hwndOwner=GetSafeHwnd(); MhC74G
bi.pszDisplayName=name;
1?)iCe
bi.lpszTitle="Select folder"; xw: v|(
bi.ulFlags=BIF_RETURNONLYFSDIRS; >yvP[$]!6
LPITEMIDLIST idl=SHBrowseForFolder(&bi); !mFo:nQ)}
if(idl==NULL) f uojf+i
return; ;SQ<^"eK
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); WujIaJt-
str.ReleaseBuffer(); L/(e/Jalg
m_Path=str; (^GVy=
if(str.GetAt(str.GetLength()-1)!='\\') Myss$gt}
m_Path+="\\"; khT&[!J{>
UpdateData(FALSE); ,CW]d#P|
} o
D;
`;fh<kv
void CCaptureDlg::SaveBmp() PK1j$&F
{ hT6:7_UD
CDC dc; *ggTTHy
dc.CreateDC("DISPLAY",NULL,NULL,NULL); >(z{1'f{
CBitmap bm; T#Pz_
hAu
int Width=GetSystemMetrics(SM_CXSCREEN); 04tUf3>
int Height=GetSystemMetrics(SM_CYSCREEN); AIsM:sV]
bm.CreateCompatibleBitmap(&dc,Width,Height); 2'g< H-[
CDC tdc; =fMSmn1S
tdc.CreateCompatibleDC(&dc); O{8"f\*
CBitmap*pOld=tdc.SelectObject(&bm); ^)N[x''a
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^&<~6y}U^
tdc.SelectObject(pOld); 47I:o9E
BITMAP btm; sBuJK'
bm.GetBitmap(&btm); LLmgk"
DWORD size=btm.bmWidthBytes*btm.bmHeight; tW5\Ktjno
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); a:@9GmtV&
BITMAPINFOHEADER bih; ]i*q*]x2u
bih.biBitCount=btm.bmBitsPixel; &QE^i%6>\
bih.biClrImportant=0; ';V(sRU@
bih.biClrUsed=0; I^Ichn
bih.biCompression=0; *lv)9L+0
bih.biHeight=btm.bmHeight; @RotJl/>
bih.biPlanes=1; O;[PEV~
bih.biSize=sizeof(BITMAPINFOHEADER); BEvSX|M>x
bih.biSizeImage=size; n? "ti
bih.biWidth=btm.bmWidth; )ufHk
bih.biXPelsPerMeter=0; %Hv$PsSJ
bih.biYPelsPerMeter=0; aM 0kV.O
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); x6HebIR+
static int filecount=0; nzy =0Ox[
CString name; uZZ[`PA(
name.Format("pict%04d.bmp",filecount++); x$CpUy{6
name=m_Path+name; oT
8
BITMAPFILEHEADER bfh; G_5sF|(mq
bfh.bfReserved1=bfh.bfReserved2=0; OxElvbM#
bfh.bfType=((WORD)('M'<< 8)|'B'); +C;ZO6%w
bfh.bfSize=54+size; )|LX_kyW
bfh.bfOffBits=54; /og}e~q
CFile bf; MIa].S#
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <0P`ct0,i
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); EC1q#;:
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,2JqX>On>Y
bf.WriteHuge(lpData,size); ~m!>e])P?X
bf.Close(); !N$4.slr<p
nCount++; =D5@PHpv(
} p@i U}SUaE
GlobalFreePtr(lpData); X2@mQ&n
if(nCount==1) \$;\,p p
m_Number.Format("%d picture captured.",nCount); P@9>4}r$
else 7 g ]]>
m_Number.Format("%d pictures captured.",nCount); ulfpop*2
UpdateData(FALSE); .u7d
} S
!c/"~X+
ZC"6B(d
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]+0-$t7Y
{ m?<8 ':
if(pMsg -> message == WM_KEYDOWN) R
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{ ?y<n^`
if(pMsg -> wParam == VK_ESCAPE) XeDU
,
return TRUE; 3+A 0O%0*
if(pMsg -> wParam == VK_RETURN) t)XV'J
return TRUE; ORQGay
} iN<5[ztd
return CDialog::PreTranslateMessage(pMsg); ;YZw{|gsh
} SJU93n"G/
n!Y.?mU6
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t{~"vD9Am
{ $O}gl Q
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 1\YX|
SaveBmp(); v{
C]\8
return FALSE; QN_5q5
} V EY !0PIj
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @mP@~
CMenu pop; >o.u,
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 7vr)JT=
CMenu*pMenu=pop.GetSubMenu(0); TeqFy( Dr
pMenu->SetDefaultItem(ID_EXITICON); "]c:V4S#`A
CPoint pt; S-2xe?sb
GetCursorPos(&pt); ?[!.TU?4N
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); )2S0OY.
if(id==ID_EXITICON) ""pJO 6bI
DeleteIcon(); aS~k.^N
else if(id==ID_EXIT) %J.Rm0FD:
OnCancel(); 5mSXf"R^
return FALSE; wT*N{).
} mf}?z21vD
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 3 tXtt@Yy
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 9}}D -&Mc
AddIcon(); )Xd=EWGUS
return res; GsDSJz
} *\VQ%_wg
o\|dm."f
void CCaptureDlg::AddIcon() Dj!J 4uD
{ YY7:WQS
NOTIFYICONDATA data; !&Q,]\j
data.cbSize=sizeof(NOTIFYICONDATA); 8.-PQ
CString tip; *<9 D]
tip.LoadString(IDS_ICONTIP); I$f:K]|.m!
data.hIcon=GetIcon(0); Fi5,y;]R
data.hWnd=GetSafeHwnd(); $,i:#KT`
strcpy(data.szTip,tip); K:'pK1zy
data.uCallbackMessage=IDM_SHELL; FC]? T
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; *3"C"4S
data.uID=98; 9HTb
Shell_NotifyIcon(NIM_ADD,&data); 00;=6q]TA
ShowWindow(SW_HIDE); $ya#-pi`;
bTray=TRUE; {g/\5Z\b
} `dL9sfj>
;/oMH/,U8
void CCaptureDlg::DeleteIcon() {qLnwy!i
{ Mqc[IAcd]
NOTIFYICONDATA data; 9!9 Gpi
data.cbSize=sizeof(NOTIFYICONDATA); Ch;EnN<
data.hWnd=GetSafeHwnd(); gEi"m5po
data.uID=98; q,:\i+>K*
Shell_NotifyIcon(NIM_DELETE,&data); 9,y&?GLP
ShowWindow(SW_SHOW); 42m`7uQ
SetForegroundWindow(); 8 6L&u:o:
ShowWindow(SW_SHOWNORMAL); h)y"?Jj
bTray=FALSE; :hMuxHr
} |d%Dw^
3N]pN<3@
void CCaptureDlg::OnChange() kOtC(\]5
{ tOspDPSXX
RegisterHotkey(); p~3CXmUc~
} ; $y.+5 q
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z
BOOL CCaptureDlg::RegisterHotkey()
xY!]eLZ)&
{ 3I"&Qp%2
UpdateData(); K]
Eq"3
UCHAR mask=0; sS-5W-&P{T
UCHAR key=0; mD )Nh
if(m_bControl) 8<]> q
mask|=4; a?JU(
if(m_bAlt) x(S064
mask|=2; /@wm?ft6Gk
if(m_bShift)
wh*OD
mask|=1; q1?2
U<
key=Key_Table[m_Key.GetCurSel()]; x7NxHTL
if(bRegistered){ RIJBHOa
DeleteHotkey(GetSafeHwnd(),cKey,cMask); m7RWu I,
bRegistered=FALSE; iz*aBXV A[
} |Cen5s
W&
cMask=mask; H<NYm#a"
cKey=key; wV-cpJ,}
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Z&.FJZUP
return bRegistered; *E$D,
} zZf#E@=$|
!o.g2
四、小结 MnX2sX|
z4f5@
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。