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:
p,0 \NUC
zld>o3K} 一、实现方法
|JDJ{;o tw(2V$J 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
(l^lS=x |% kK?!e+- #pragma data_seg("shareddata")
wb?hfe HHOOK hHook =NULL; //钩子句柄
}v!6BU6<Q UINT nHookCount =0; //挂接的程序数目
NR [VGZj static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
?=G H{
%E static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
2#[Y/p static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
!6%mt} h static int KeyCount =0;
Qp54(` static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
*~"`&rM( #pragma data_seg()
!K2[S
J tv{.iM|V c 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
WI9.?(5q GwV FD% DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
a]k&$ M}<=~/k`j BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
uj@<_|7 cKey,UCHAR cMask)
g=(+oK? {
:}z%N7T BOOL bAdded=FALSE;
:6 fQE#(s& for(int index=0;index<MAX_KEY;index++){
`3KprpE8v if(hCallWnd[index]==0){
Ed-gYL^< hCallWnd[index]=hWnd;
._3NqE; HotKey[index]=cKey;
]4yvTP3[Rm HotKeyMask[index]=cMask;
Z^l!y5s/H bAdded=TRUE;
v3"xJN_,[p KeyCount++;
QhUraZ break;
iQF}x&a< }
t;]egk }
(AYS>8O& return bAdded;
;cr6Xop#? }
\_E.%K //删除热键
o;mIu#u BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
u^9c` {
Uz|]}t5V BOOL bRemoved=FALSE;
qrc/Q;$ for(int index=0;index<MAX_KEY;index++){
Anv8)J!9u if(hCallWnd[index]==hWnd){
Y
zS*p~| if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Oy&'zigJ hCallWnd[index]=NULL;
AF$ o>f HotKey[index]=0;
-#6*T,f0P( HotKeyMask[index]=0;
gxM8IQ bRemoved=TRUE;
6~ `bAe`} KeyCount--;
BT3O_X`u break;
^mpB\D)q }
CE,Om^ }
0Q >|s_ }
[{F7Pc return bRemoved;
'.yWL }
GuWBl$|+b 9 Zm<1Fw 2H[aY%1T DLL中的钩子函数如下:
ssITe.,ny QJWES%m` LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
o(/ia3 {
3SDWR@x& BOOL bProcessed=FALSE;
N RSse" if(HC_ACTION==nCode)
v:MS0] {
SsX05> if((lParam&0xc0000000)==0xc0000000){// 有键松开
~^~RltY switch(wParam)
9Fx z!-9m {
YO$b# case VK_MENU:
3b@1Zahz MaskBits&=~ALTBIT;
+A ?+G break;
&W+G{W{3 case VK_CONTROL:
zl
0^EltiU MaskBits&=~CTRLBIT;
0C+yq'D~[ break;
[e@OHQM case VK_SHIFT:
6XL9
qb~X MaskBits&=~SHIFTBIT;
y'|W[' break;
.N5R?fmD default: //judge the key and send message
j_uY8c>3\q break;
^%$W S, }
[I<'E
LX for(int index=0;index<MAX_KEY;index++){
lEbR) B, if(hCallWnd[index]==NULL)
+Y9D!=_lj continue;
Qn)[1v if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Q0uO49sg {
h9w^7MbO SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
1\J1yOL bProcessed=TRUE;
~uZLe\>K }
~K#_'Ldrd }
7U
)qC}( }
k&_u\D"^"% else if((lParam&0xc000ffff)==1){ //有键按下
2X;0z$ switch(wParam)
}%ZG>LG5J {
<\9Ijuq}k
case VK_MENU:
HD8"=7zJk MaskBits|=ALTBIT;
(=tF2YBV break;
M=
q~EMH case VK_CONTROL:
sEJ;t0.LX MaskBits|=CTRLBIT;
t k/K0u break;
I1 R\Ts@ case VK_SHIFT:
a2=uM}Hsp MaskBits|=SHIFTBIT;
J%-lw{FC break;
)"c]FI[} default: //judge the key and send message
xBE
RCO^ break;
Q~Sv2 }
N"
Jtg@w for(int index=0;index<MAX_KEY;index++){
vz#wP if(hCallWnd[index]==NULL)
Rr;LV<q+ continue;
X6N]gD if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~SR(K{nf#. {
,ORG"]_F SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Fb{`a[& bProcessed=TRUE;
o!l3.5m2d }
qnk,E- }
Ibv_D$cT }
.1z$ A if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
B:A1W{l for(int index=0;index<MAX_KEY;index++){
6|9g4@Hy if(hCallWnd[index]==NULL)
;LF)u2x= continue;
y%IG:kZ, if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
;/)Mcx] n SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
8NAWA3^B //lParam的意义可看MSDN中WM_KEYDOWN部分
K7[AiU_I }
#-gGsj;F }
!AD0-fZ }
ej"o?1l@ return CallNextHookEx( hHook, nCode, wParam, lParam );
|<$<L`xoe }
k}f<'g<H gGI#QPT`X 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:
%+7T9>+ BudWbZ5>Ep BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
2*-ENW2 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
7S dV%" (Xr_ np @ 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:
9#EHXgz _86*.3fQG LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
,yM}]pwlB {
1|l)gfcP if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
35%[DUkb {
F; MF:;mM //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
+C'TW^ SaveBmp();
>TlW]st return FALSE;
bQ^DX `o6P }
q2S!m6 ! …… //其它处理及默认处理
/.| A }
[yYH>~SuwZ :Er^"9'A2 :!+}XT7)/ 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。
u^aFj%}]L n ,&/D 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。
{XDY:`vZ} Uxk[O 二、编程步骤
]M+VSU Z92iil;t 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";
~|r'2V* O ':0V 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
jsNH`" =.qm8+ 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;
9k=U0]!ch 7g A08M[O 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;
I9[1U "W &:j:o 5、 添加代码,编译运行程序。
|2
YubAIZ( "'z,[v50& 三、程序代码
u{OS6Ky XSm"I[.g ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
wQD0vsD #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
9lZAa8Rx i #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
nOAJ9 #if _MSC_VER > 1000
fr}1_0DDz #pragma once
,?xLT2>J_ #endif // _MSC_VER > 1000
7xv4E<r2 #ifndef __AFXWIN_H__
,]PyDq6 #error include 'stdafx.h' before including this file for PCH
i}/e}s<-6 #endif
(|0.m8D~D #include "resource.h" // main symbols
E ;BPN class CHookApp : public CWinApp
sJ))<,e5I {
[K cki+ public:
AfbB~Ll Bq CHookApp();
v"P&`1=T // Overrides
Pl rkgS0J // ClassWizard generated virtual function overrides
F`Dg*O //{{AFX_VIRTUAL(CHookApp)
K0EY<Ltq public:
]6$,IKE7 virtual BOOL InitInstance();
KGV.S virtual int ExitInstance();
!US8aT //}}AFX_VIRTUAL
c;:">NR //{{AFX_MSG(CHookApp)
w(76H^e // NOTE - the ClassWizard will add and remove member functions here.
ID67?:%r // DO NOT EDIT what you see in these blocks of generated code !
/9x{^ //}}AFX_MSG
g$*/XSr( DECLARE_MESSAGE_MAP()
fm(mO% };
]{f^;y8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
0dgP BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
b]!9eV$ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
*4<4 BOOL InitHotkey();
s?QVX~S" BOOL UnInit();
%
v;e #endif
d]tv'|E13 [[:UhrH- //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
tigT@!`$Y #include "stdafx.h"
J>rka]* #include "hook.h"
9R9__w; #include <windowsx.h>
"+=Pp #ifdef _DEBUG
L'zE<3O'3 #define new DEBUG_NEW
uije#cj#O #undef THIS_FILE
,:D=gQ@` static char THIS_FILE[] = __FILE__;
a}:A, t<6 #endif
z]^+^c_ #define MAX_KEY 100
D
Irgq|8 #define CTRLBIT 0x04
HXQ e\r #define ALTBIT 0x02
`I5O4|K) #define SHIFTBIT 0x01
+c^_^Z$_4o #pragma data_seg("shareddata")
s|Z:}W?{ HHOOK hHook =NULL;
`W@T'T" UINT nHookCount =0;
?b||Cr static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
=43I1&_
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
D`6iDit static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
s}6+8 fE" static int KeyCount =0;
QX[Djz0H8 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
n[!;yO #pragma data_seg()
WfTD7?\dw HINSTANCE hins;
6cM<>&e void VerifyWindow();
yn SBVb!) BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
)uZoH8? //{{AFX_MSG_MAP(CHookApp)
#
;K,,ku
x // NOTE - the ClassWizard will add and remove mapping macros here.
`E@kFJ(<On // DO NOT EDIT what you see in these blocks of generated code!
=M7TCE //}}AFX_MSG_MAP
QE|`&~sme END_MESSAGE_MAP()
S_J,[#& |xn#\epy@ CHookApp::CHookApp()
G6ayMw]OF {
9B
/s // TODO: add construction code here,
{P-xCmZ~Wt // Place all significant initialization in InitInstance
GL1'Zo }
v=!YfAn tR kF
CHookApp theApp;
M\Se_ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
a 6%@d_A {
eP "`,< BOOL bProcessed=FALSE;
XAe\s` if(HC_ACTION==nCode)
\V,c]I
{
"!O1j
r; if((lParam&0xc0000000)==0xc0000000){// Key up
U4BqO
:sd switch(wParam)
bmu6@jT {
[F+(^- ( case VK_MENU:
Y9F)`17 MaskBits&=~ALTBIT;
e}c&LDgU break;
`ncNEHh7K case VK_CONTROL:
_a](V6 MaskBits&=~CTRLBIT;
@Mm/C?#*O break;
jpRBER_X case VK_SHIFT:
%SAw;ZtQ: MaskBits&=~SHIFTBIT;
`OqM8U
@ break;
c!It^* default: //judge the key and send message
YTK^ijmU6x break;
MaO"#{i }
.20V
3 for(int index=0;index<MAX_KEY;index++){
fAGctRGH if(hCallWnd[index]==NULL)
`H\)e%] continue;
Y;Ap9i* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
"+)K |9T# {
OOnX` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
CK0l9#g bProcessed=TRUE;
3X;{vO\a1 }
Zb(E:~h\ }
AEY$@!8
}
\q "N/$5{f else if((lParam&0xc000ffff)==1){ //Key down
7Y1GUIRa3 switch(wParam)
r`jWp\z {
%Tv^GP{} case VK_MENU:
{T=52h=e MaskBits|=ALTBIT;
fiVHRSX60 break;
)tS-.P rA- case VK_CONTROL:
.h4\{| MaskBits|=CTRLBIT;
4*TmlY break;
&SH1q_&BQ case VK_SHIFT:
b O=yi) MaskBits|=SHIFTBIT;
+L0w;w T break;
zvY+R\,in default: //judge the key and send message
qi(*ty break;
b7HffO O }
MPIlSMe for(int index=0;index<MAX_KEY;index++)
X8i(~
B {
y500Xs[c if(hCallWnd[index]==NULL)
j(eFoZz, continue;
P`S@n/} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&fwS{n;U {
glE^t6) SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
-Fxmsi bProcessed=TRUE;
x&Cp> +i }
; Y"N6% }
2#vv$YD }
=wG+Ao if(!bProcessed){
Zp&@h-%YoD for(int index=0;index<MAX_KEY;index++){
9XLFHV(" if(hCallWnd[index]==NULL)
S|em[D[Y^ continue;
('C7=u&F if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
#]E(N~ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
fKHE;A*>% }
t9^A(Vh"- }
uLQ }
2 rN ,D( return CallNextHookEx( hHook, nCode, wParam, lParam );
"B{ECM; }
0:=ZkEEeU l>6@:nq|R BOOL InitHotkey()
x[(?# {
,+`HQdq if(hHook!=NULL){
`y^sITr nHookCount++;
-F\qnsZ2 return TRUE;
%0,-.(h }
+oc
>S else
Wht(O~F hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
FS"eM"z if(hHook!=NULL)
a.@qGsIH nHookCount++;
~Rpm-^ return (hHook!=NULL);
~+G#n"P n }
WC,+Cn e BOOL UnInit()
?wb+L {
!ABiy6d if(nHookCount>1){
rJJ[X4$ nHookCount--;
&QNY,Pj return TRUE;
$w#r"= ) }
#!2k<Q*5uT BOOL unhooked = UnhookWindowsHookEx(hHook);
G8Z 4J7^ if(unhooked==TRUE){
]Mi.f3QlO6 nHookCount=0;
S'LZk9E hHook=NULL;
)IL
#>2n? }
.8WXC
return unhooked;
({^9<Us }
e>}}:Ud \HZ9S= BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
"TcW4U9 {
Ge+0-I6Ju BOOL bAdded=FALSE;
)$Mmn for(int index=0;index<MAX_KEY;index++){
4|?{VQ if(hCallWnd[index]==0){
Oakb' hCallWnd[index]=hWnd;
$wB^R(f@ HotKey[index]=cKey;
bFS>) HotKeyMask[index]=cMask;
Bux [6O% bAdded=TRUE;
Hr<o!e{Y KeyCount++;
px;/8c- break;
U]|agz> }
SOZPZUUEJ }
9BEFr/. return bAdded;
*?ITns W< }
Ih}1%Jq p d[ncL BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
LQYy;<K {
fvq,,@23 BOOL bRemoved=FALSE;
8eBOr9l+j for(int index=0;index<MAX_KEY;index++){
H)w(q^i if(hCallWnd[index]==hWnd){
S~Z|PLtF if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
qa`-* 4m hCallWnd[index]=NULL;
N2'qpxOLI HotKey[index]=0;
hU]HTX'R HotKeyMask[index]=0;
}[+!$# bRemoved=TRUE;
l v&mp0V+ KeyCount--;
+=q) break;
YgUH'P- }
*l+OlQI0+ }
?>c=}I#Ui- }
>LC<O. return bRemoved;
xo}b=
v }
2&PPz}Sw iD38\XNMV void VerifyWindow()
mW2,1}Jv {
qBV x6MI for(int i=0;i<MAX_KEY;i++){
3.d"rl if(hCallWnd
!=NULL){ Y9=K]GB
if(!IsWindow(hCallWnd)){ K,'*Dz
hCallWnd=NULL; &3F}6W6A
HotKey=0; }v9\F-0>Q
HotKeyMask=0; 7;@ST`cC
KeyCount--; DZ7
gcC
} .d;Iht,[
} @ V08U!
} {GDmVWG0q
} ~\)qi=
le +R16Z
BOOL CHookApp::InitInstance() 0P^L }VVX
{ ).` S/F
AFX_MANAGE_STATE(AfxGetStaticModuleState()); D\w h;r
hins=AfxGetInstanceHandle(); {rfF'@[
InitHotkey(); DS-0gVYeDW
return CWinApp::InitInstance(); ?[<Tx-L
} j"^+oxH
}8|[;Qa`y
int CHookApp::ExitInstance() /={Js*
{ j*"3t^|-
VerifyWindow(); &8&d3EQ
UnInit(); }G o$
\Bk
return CWinApp::ExitInstance(); vb 1@yQ
} Z=B_Ty
FGO[
|]7IN
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file b`yZ|j'ikd
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) SK1!thQy
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ DFhXx6]
#if _MSC_VER > 1000 e^4 p%
#pragma once sDr/k`>
#endif // _MSC_VER > 1000 dkgSvi :!
YprHwL
class CCaptureDlg : public CDialog 5uq3\a
{ fO'Wj`&a
// Construction 0]QRsVz+
public: }bN%u3mHws
BOOL bTray; )"zvwgaW
BOOL bRegistered; I? THa<
BOOL RegisterHotkey(); Q9}dHIe1E
UCHAR cKey; DRqZ,[!+
UCHAR cMask; o1&:ry
void DeleteIcon(); -<jL~][S
void AddIcon(); Fhv/[j^X
UINT nCount; J"=1/,AS
void SaveBmp(); } VJfJ/
CCaptureDlg(CWnd* pParent = NULL); // standard constructor vZ/6\Cz
// Dialog Data xtPLR/Z
//{{AFX_DATA(CCaptureDlg) L9pvG(R%
enum { IDD = IDD_CAPTURE_DIALOG }; lis/`B\x
CComboBox m_Key; *
tCS
BOOL m_bControl; h)~=Dm
BOOL m_bAlt; Qk!;M|
BOOL m_bShift; +`7KSwa
CString m_Path; xq6cKtSv
CString m_Number; ,+`61J3W
//}}AFX_DATA 'r(1Nj
// ClassWizard generated virtual function overrides -a*K$rnB
//{{AFX_VIRTUAL(CCaptureDlg) [I4ege>
public: Kvsh
virtual BOOL PreTranslateMessage(MSG* pMsg); hcVJBK
protected: syU9O&<
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support y/e2l
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); dz~co Z9
//}}AFX_VIRTUAL vR0];{
// Implementation cvwhSdZu8
protected: ThPE
0V
HICON m_hIcon; >!_Xgw
// Generated message map functions < >UPD02
//{{AFX_MSG(CCaptureDlg)
h:lt<y
virtual BOOL OnInitDialog(); sr@j$G#uW5
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); r{L4]|(utY
afx_msg void OnPaint(); QwhRNnE=
afx_msg HCURSOR OnQueryDragIcon(); PoEqurH0
virtual void OnCancel(); .2J
L$"
afx_msg void OnAbout(); VMoSLFp^R
afx_msg void OnBrowse(); jx acg^c
afx_msg void OnChange(); v]__%_
//}}AFX_MSG ?+T^O?r|O
DECLARE_MESSAGE_MAP() \{Q?^E
}; S+TOSjfis
#endif \om%Q[F7a
nG_6oe*=I
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file =^H4 Yck/5
#include "stdafx.h" eZ"1gYqy
#include "Capture.h" cyxuK*x<
#include "CaptureDlg.h" E}%hz*Q)(
#include <windowsx.h> 5[j`6l
#pragma comment(lib,"hook.lib") T~h5B(J;
#ifdef _DEBUG JCAq8=zM
#define new DEBUG_NEW <~
J O
s2
#undef THIS_FILE 3\T2?w9u(
static char THIS_FILE[] = __FILE__; Qt]Q:9I[
#endif '!f5?O+E
#define IDM_SHELL WM_USER+1 R |KD&!~Z
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rJ KZ)N{
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5NJ4
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; hzk6rYg1
class CAboutDlg : public CDialog nQ|r"|g
{ `9k0Gd
public: 0Z{j>=$
CAboutDlg(); npRSE v
// Dialog Data r>GZ58i
//{{AFX_DATA(CAboutDlg) /b|0PMX
enum { IDD = IDD_ABOUTBOX }; ?xK,mbFgl
//}}AFX_DATA Q f(p~a(d
// ClassWizard generated virtual function overrides =@F&o4) r
//{{AFX_VIRTUAL(CAboutDlg) r-,e;o>9
protected: AIA6yeaU
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7)h[Zy,A
//}}AFX_VIRTUAL ?f/n0U4w
// Implementation fib}b?vk
protected: 3>
/K0N|$
//{{AFX_MSG(CAboutDlg) !|c|o*t{
//}}AFX_MSG +2 Af&~T
DECLARE_MESSAGE_MAP() _)]CzBRq\6
}; C"IKt
|lv|!]qAma
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) XD"_Iq!
{ G%d
(
//{{AFX_DATA_INIT(CAboutDlg) ')GSAY7
//}}AFX_DATA_INIT .f+TZDUO
} u^029sH6j
BB|?1"neg
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #p[',$cC
{ wgd /(8d
CDialog::DoDataExchange(pDX); uYr fm:4S
//{{AFX_DATA_MAP(CAboutDlg) MQin"\
//}}AFX_DATA_MAP {nU=%w"\
} {}:ToIp
$['Bv
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) \=>H6x]q
//{{AFX_MSG_MAP(CAboutDlg) ^k<oT'89
// No message handlers %/updw#{B
//}}AFX_MSG_MAP OT&k.!=
END_MESSAGE_MAP() Y2'cs~~$Ce
Ali9pvE
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) y!]CJigpZ
: CDialog(CCaptureDlg::IDD, pParent) ExRe:^yU\
{ ?k(\ApVHj
//{{AFX_DATA_INIT(CCaptureDlg) epgPT'^
m_bControl = FALSE; sUPz/Z.h
m_bAlt = FALSE; @?"h
!fyu
m_bShift = FALSE; -(K9s!C!.
m_Path = _T("c:\\"); ~)(\6^&=|
m_Number = _T("0 picture captured."); vOg#Dqn-
nCount=0; ,]T2$?|
bRegistered=FALSE; "Ky; a?Y
bTray=FALSE; h,"4SSL
//}}AFX_DATA_INIT
^eoLAL
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 tnLAJ+-M
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); F`9]=T0
} U!Ek'
|^@dFOz
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ul*Qt}
{ )Pv9_XKJ
CDialog::DoDataExchange(pDX); 2h%z ("3/
//{{AFX_DATA_MAP(CCaptureDlg) P (S>=,Y&
DDX_Control(pDX, IDC_KEY, m_Key);
YtO|D
DDX_Check(pDX, IDC_CONTROL, m_bControl); H*9~yT'Q
DDX_Check(pDX, IDC_ALT, m_bAlt); @Vu(XG
DDX_Check(pDX, IDC_SHIFT, m_bShift); MX+Z ?
DDX_Text(pDX, IDC_PATH, m_Path); |\n_OS7
DDX_Text(pDX, IDC_NUMBER, m_Number); N<DGw?Rl
//}}AFX_DATA_MAP \(%Y%?dy
} '? jlH0;
)XWP\
h
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) |.wEm;Bz
//{{AFX_MSG_MAP(CCaptureDlg) H'HSD,>(
ON_WM_SYSCOMMAND()
`7H4Y&E
ON_WM_PAINT() ]n-:Yv5 W
ON_WM_QUERYDRAGICON() 9Vf1Xz
ON_BN_CLICKED(ID_ABOUT, OnAbout) o: ;"w"G
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0
Us5
ON_BN_CLICKED(ID_CHANGE, OnChange) Qqlup
//}}AFX_MSG_MAP ":_vK}5
END_MESSAGE_MAP() ~jsLqY*(+
"9n3VX)
BOOL CCaptureDlg::OnInitDialog() $HJwb-I
{ R"K#7{p9
CDialog::OnInitDialog(); f^VP/rdg
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 85GKymz$P
ASSERT(IDM_ABOUTBOX < 0xF000); ~}<DG1!
CMenu* pSysMenu = GetSystemMenu(FALSE); p ]d]QMu
if (pSysMenu != NULL) ~9j%Hm0ht
{ ?@V[#.
CString strAboutMenu; E4hLtc^
+
strAboutMenu.LoadString(IDS_ABOUTBOX); 5<w g8y
if (!strAboutMenu.IsEmpty()) 9*a=iL*Nw
{ h9eMcCU
pSysMenu->AppendMenu(MF_SEPARATOR); 5ls6t{Ci
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); -{ZWo:,r~q
} __.+s32SS$
} 4^URX>nx8
SetIcon(m_hIcon, TRUE); // Set big icon QVtQx>K`
SetIcon(m_hIcon, FALSE); // Set small icon 9V5-%Iv
m_Key.SetCurSel(0); ooQQ-?"m
RegisterHotkey(); NC38fiH_N
CMenu* pMenu=GetSystemMenu(FALSE); 0'IBN}
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 73){K?R
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); x7$}8LZ"B
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); I(XOE$3
return TRUE; // return TRUE unless you set the focus to a control h*v8#\b$J_
} _8E/)M
&%-73nYw
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) N ,z6y5Lu
{ Dtj&W<NXo
if ((nID & 0xFFF0) == IDM_ABOUTBOX) G.UI|r/Kz
{ gg8Uo G
CAboutDlg dlgAbout; ghRVso(
dlgAbout.DoModal(); F>rH^F
} z[;z>8|c
else k5T,990
{ /3{b%0Aa
CDialog::OnSysCommand(nID, lParam); hvaSH69*m
} (P$H<FtH
} hodgDrmO/
|vw"[7_aS
void CCaptureDlg::OnPaint() /gG"v5]
{ /Sh#_\x
if (IsIconic()) d N$Tf
{ E@b(1@
CPaintDC dc(this); // device context for painting
)KAEt.
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); rh^mJUh
// Center icon in client rectangle r3PT1'P?L
int cxIcon = GetSystemMetrics(SM_CXICON); &c,kQo+pA
int cyIcon = GetSystemMetrics(SM_CYICON); VzVc37Z>6
CRect rect; b1($R[
GetClientRect(&rect); 7"C$pm6
int x = (rect.Width() - cxIcon + 1) / 2; =y!$/(H
int y = (rect.Height() - cyIcon + 1) / 2; g
pOC`=
// Draw the icon ){b@}13cF
dc.DrawIcon(x, y, m_hIcon); HZ:6zH
} g?ULWeZg5
else _D+J!f^
{ ^cuc.g)c$?
CDialog::OnPaint(); d}4Y(
} ZEx}$<)_
} % S os
<q@a~'Ai?!
HCURSOR CCaptureDlg::OnQueryDragIcon() sL$:"=
{ )<tI!I][j
return (HCURSOR) m_hIcon; zld#qG6
} c.e2 M/
i ,/0/?)*_
void CCaptureDlg::OnCancel() NN?`"Fww
{ PGoh1Uu
if(bTray) J
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DeleteIcon(); Kh_Lp$'0uM
CDialog::OnCancel(); 2_Z ? #Y
} 3(,?S$>
rQ qW_t%
void CCaptureDlg::OnAbout() w {3<{
{ )z28=%g
CAboutDlg dlg; 1waTTT?"Ho
dlg.DoModal(); 2V#>)R#k
} R)m'lMi|
+O?KNZ
void CCaptureDlg::OnBrowse() 7](KV" %V
{ Xx>X5Fy
CString str; OL^l 3F
BROWSEINFO bi; ,]d/Q<
char name[MAX_PATH]; @W"KVPd
ZeroMemory(&bi,sizeof(BROWSEINFO)); z+n,uHs
bi.hwndOwner=GetSafeHwnd(); Jh!I:;/
bi.pszDisplayName=name; )`(p9@,V
bi.lpszTitle="Select folder"; '?p<lu^^B
bi.ulFlags=BIF_RETURNONLYFSDIRS; XLrwxj0
LPITEMIDLIST idl=SHBrowseForFolder(&bi); }*S `qW;B
if(idl==NULL) yvO{:B8%
return; |M,iM]
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); t,+nQ9
str.ReleaseBuffer(); )u`[6,d
m_Path=str; ia+oX~W!VR
if(str.GetAt(str.GetLength()-1)!='\\') HK0!P*
m_Path+="\\"; YOmM=X+'H
UpdateData(FALSE); 7Bd-!$j+
} KJaXg;,H
yj.7'{mA
void CCaptureDlg::SaveBmp() 7E79-r&n
{ ~yW4)4k;b
CDC dc; %/zbgS`
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8&qZ0GLaT
CBitmap bm; ?q{,R"
int Width=GetSystemMetrics(SM_CXSCREEN); LQRQA[^
int Height=GetSystemMetrics(SM_CYSCREEN); F7EKoDt
bm.CreateCompatibleBitmap(&dc,Width,Height); [R^iF
CDC tdc; Ay0U=#XP
tdc.CreateCompatibleDC(&dc); 2$g6}A`r
CBitmap*pOld=tdc.SelectObject(&bm); >8#X;0\Kj
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); SPY|K
tdc.SelectObject(pOld); Ssou
BITMAP btm; NRIG 1v>
bm.GetBitmap(&btm); UMm!B `M
DWORD size=btm.bmWidthBytes*btm.bmHeight; biU^[g("
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); -7@/[9Gf`:
BITMAPINFOHEADER bih; zGkS^Z=(
bih.biBitCount=btm.bmBitsPixel; |8l<$J
bih.biClrImportant=0; @v)p<r^M">
bih.biClrUsed=0; :2rZcoNb.
bih.biCompression=0; 8"8t-E#?
bih.biHeight=btm.bmHeight; oldA#sA$
bih.biPlanes=1; Ki$MpA3j
bih.biSize=sizeof(BITMAPINFOHEADER); &-Gqdnc
bih.biSizeImage=size; Pama#6?OPh
bih.biWidth=btm.bmWidth; qGB{7-r u
bih.biXPelsPerMeter=0; iW%I|&
bih.biYPelsPerMeter=0; H2jgO?l;!
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); RbP6F*f
static int filecount=0; '}Z~JYa0
CString name; sHt].gZ
name.Format("pict%04d.bmp",filecount++); y[)> yq y
name=m_Path+name; ?R$F)g7<
BITMAPFILEHEADER bfh; qzKdQ&vO
bfh.bfReserved1=bfh.bfReserved2=0; 2db3I:;E
bfh.bfType=((WORD)('M'<< 8)|'B'); ZQ%'`q\c
bfh.bfSize=54+size; ~-_kM
bfh.bfOffBits=54; Gi?/C&1T
CFile bf; V)~.~2$
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ QSdHm
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); v4`"1Ss,K
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); AQ,'
6F9
bf.WriteHuge(lpData,size); '$ =>
bf.Close(); Mh:L$f0A%O
nCount++; l3Q(TH ~I
} #*K}IBz
GlobalFreePtr(lpData); 8<pzb}xK
if(nCount==1) p6#g;$V$
m_Number.Format("%d picture captured.",nCount); i1NY9br
else D%OQ e#!
m_Number.Format("%d pictures captured.",nCount); r%yvOF\>
UpdateData(FALSE); ~=6xyc/c
} +eK"-u~K
aW)-?(6>
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) mD$A4Y-'p
{ >~[c|ffyo/
if(pMsg -> message == WM_KEYDOWN) H8Bs<2
{ `>f6)C-
if(pMsg -> wParam == VK_ESCAPE) (:TjoXXiY
return TRUE; DEG[Z7Ju
if(pMsg -> wParam == VK_RETURN) M "p
return TRUE; ;=eDO(Ij
} dJeNbVd
return CDialog::PreTranslateMessage(pMsg); ~J wb`g.
} RKHyw08
(2J: #
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) eg\v0Y!rI
{ cl[BF'.H
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5\5/
SaveBmp(); Y)0*b5?1r
return FALSE; DS.RURzd{r
} A}G7l?V&
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dMf:h"7
CMenu pop; 8<S~Z:JK
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); lYVz3p
CMenu*pMenu=pop.GetSubMenu(0); dx5#\"KX=,
pMenu->SetDefaultItem(ID_EXITICON); A&.WH?p
CPoint pt; {5U{8b]k
GetCursorPos(&pt); o{* e'4
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); QdH\LL^8R4
if(id==ID_EXITICON) V:In>u$QJ!
DeleteIcon(); W=^#v
else if(id==ID_EXIT) @5=oeOg36
OnCancel(); d6}r#\
return FALSE; y~AVei&
} VRWAm>u
LRESULT res= CDialog::WindowProc(message, wParam, lParam); fHE<(
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) *}F3M\
AddIcon(); b~KDP+Ri
return res; \HxT@UQ)~
} ]qethaNy
[,t*Pfq'W8
void CCaptureDlg::AddIcon() xu/cq9
{ 1an^1!
NOTIFYICONDATA data; T! Y@`Ox
data.cbSize=sizeof(NOTIFYICONDATA); H[s(e56z
CString tip; 8ndYV>{f
tip.LoadString(IDS_ICONTIP); BZ94NOOdw
data.hIcon=GetIcon(0); V+*
P2|
data.hWnd=GetSafeHwnd(); YSr9VpqWV
strcpy(data.szTip,tip); Xb:;</
data.uCallbackMessage=IDM_SHELL; T*8VDY7
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >BIMi^
data.uID=98; f=(?JT
Shell_NotifyIcon(NIM_ADD,&data); ][gq#Vx@
ShowWindow(SW_HIDE); 3GaQk-
bTray=TRUE; 5,3'=mA6
} "Gfh ,e
q+H%)kF
void CCaptureDlg::DeleteIcon() 6]V4muz#c
{ bU>U14ix<
NOTIFYICONDATA data; #a/5SZP
Z\
data.cbSize=sizeof(NOTIFYICONDATA); wa<MRt W=
data.hWnd=GetSafeHwnd(); I
WTwz!+
data.uID=98; /[a~3^Gs^
Shell_NotifyIcon(NIM_DELETE,&data); q.KG^=10
ShowWindow(SW_SHOW); 6Z>FTz_
SetForegroundWindow(); A>vBQN
ShowWindow(SW_SHOWNORMAL); m'Amli@[
bTray=FALSE; ''q@>
} ~Sg5:T3
7L`A{L
void CCaptureDlg::OnChange() iZ#!O*>
{ ]{)a,c NG
RegisterHotkey(); aGrIQq/k)%
} 9=vMgW
WKts[Z
BOOL CCaptureDlg::RegisterHotkey() bZnuNYty75
{ ^nT/i
.#_
UpdateData(); p#01gB
UCHAR mask=0; 09X01X[
UCHAR key=0; ,V,`Jf
if(m_bControl) <6EeD5{*
mask|=4; :By?O"LQ
if(m_bAlt) L6t+zIUc-~
mask|=2; R+2+-j4
if(m_bShift) y~Bh
mask|=1; n&{Dq}q
key=Key_Table[m_Key.GetCurSel()];
#zG&|<hc
if(bRegistered){ 6.CbAi3Z
DeleteHotkey(GetSafeHwnd(),cKey,cMask); gQ o]
bRegistered=FALSE; )#BMTKA^
} &v$rn#l
cMask=mask; (_niMQtF}
cKey=key; \a 5U8shc
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]9YJ,d@J
return bRegistered; 6%'.A]"
} 8UW^"4
J ][T"K
四、小结 -|J"s$yO4
HKU~UTRnZ
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。