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:
0CDTj,eK
$OUa3!U_! 一、实现方法
w6E?TI vfo[<" 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
C&;'Pw9H F^aD!O ~ #pragma data_seg("shareddata")
r1=Zoxc=w HHOOK hHook =NULL; //钩子句柄
;=n7 Z UINT nHookCount =0; //挂接的程序数目
JEP"2M N, static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
fN K~z* static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Tok"-$`N static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
!?+3jzG static int KeyCount =0;
"jpjBH:c$ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
lRO8}XSI #pragma data_seg()
i>rn!?b ^%<v| Y(X 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。
>*_?^F_ _>aesp% 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:
)pvZM? $GPA6 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
j&&^PH9ZY cKey,UCHAR cMask)
ct]5\g?U' {
Y] n^(V BOOL bAdded=FALSE;
4+W}TKw for(int index=0;index<MAX_KEY;index++){
V3`*LU if(hCallWnd[index]==0){
"Srp/g]a hCallWnd[index]=hWnd;
N7M^ HotKey[index]=cKey;
)q=1<V44d HotKeyMask[index]=cMask;
JRo{z{!O6 bAdded=TRUE;
V,Gt5lL&/! KeyCount++;
aI\VqOt] break;
-I|yi' }
2N]y)S_<V }
Ny~;"n return bAdded;
TQEZ<B$ }
kNjbpCE\! //删除热键
}5]NUxQ_ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
*in_Zt3 {
HK-?<$Yc BOOL bRemoved=FALSE;
o?X\,}-s for(int index=0;index<MAX_KEY;index++){
grS,PKH if(hCallWnd[index]==hWnd){
fDRQ(} if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
2?"9NQvz hCallWnd[index]=NULL;
G?"1
z; HotKey[index]=0;
x7*}4>|W,I HotKeyMask[index]=0;
\fKv+ bRemoved=TRUE;
SKS[Lf KeyCount--;
$6J5yE break;
'2
)d9_ w }
c^=:]^ }
1XZ&X] }
NKMB,b return bRemoved;
wHY;Y-(ZT }
e)iVX<qb D!-zQ`^
<Nw?9P DLL中的钩子函数如下:
W35nnBU gr7W&2x7\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
@&~BGh {
mDq01fU4 BOOL bProcessed=FALSE;
tL3(( W" if(HC_ACTION==nCode)
:*8@MjZ4 {
xL!05du
if((lParam&0xc0000000)==0xc0000000){// 有键松开
HN3
yA1<[V switch(wParam)
jt]+(sx {
Te.hXCFD case VK_MENU:
SZ0Zi\W MaskBits&=~ALTBIT;
z* `81 break;
,fNiZ case VK_CONTROL:
O+e8}Tmm MaskBits&=~CTRLBIT;
lz>5bR' break;
+&t{IP(? case VK_SHIFT:
_&:o"""Wf MaskBits&=~SHIFTBIT;
JhD8.@} b~ break;
56v<!L5% default: //judge the key and send message
HL)1{[|` break;
Bq _<v)M* }
F{}z[0 for(int index=0;index<MAX_KEY;index++){
sn*s7v: if(hCallWnd[index]==NULL)
:l7\7IT continue;
0? l if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Fq{nc]L6 {
g\^(>Ouc SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
PEBQ|k8g& bProcessed=TRUE;
w|M?t{ }
S=my;M- }
a $KM
q> }
0J_ x*k6 else if((lParam&0xc000ffff)==1){ //有键按下
VVf~ULZ- switch(wParam)
ngNg1zV/q {
\/,SH?>4x case VK_MENU:
%%f=aPw MaskBits|=ALTBIT;
adxJA}K} break;
bEy%S"\< case VK_CONTROL:
<n#JOjHV MaskBits|=CTRLBIT;
)wGC=, break;
q| j;dI& case VK_SHIFT:
@!F9}n
AP MaskBits|=SHIFTBIT;
7N""w5 break;
2f-Z\3)9 J default: //judge the key and send message
GRs ;-Jt break;
l"vT@g| }
n =v %}@f2 for(int index=0;index<MAX_KEY;index++){
?+TD2~rD( if(hCallWnd[index]==NULL)
{1qEN_ERx continue;
YV2^eGr. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
3NJ-.c@(p {
``O\'{o& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
m4%m0"Z bProcessed=TRUE;
J=Jw"? f }
Y>z(F\ }
) ejvT- }
n_w,Ew,>5 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
W6*(Y for(int index=0;index<MAX_KEY;index++){
[s2%t"H-y if(hCallWnd[index]==NULL)
'-*r&: continue;
Dg]i}; if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
KYeA= SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
3;Xs`dk //lParam的意义可看MSDN中WM_KEYDOWN部分
X~j
A*kmAj }
7/~"\nN:/ }
N*z<VZ }
!KF;Z|_(I return CallNextHookEx( hHook, nCode, wParam, lParam );
-Zw"o> }
N[mOJa: F4PD3E_# 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
z=u4&x|xA @hv9=v+ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
%Cr-cR0 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
vi=yR UjfB+=7I{L 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
>:K3y$]_ 7>4t{aRf_8 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
kC#;j=K? {
Xau.4&\d if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
*]EcjK% {
A+dY~@*a //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
f8n'9HOw> SaveBmp();
zb3ir| return FALSE;
g-]td8}# }
kiECJ@5p …… //其它处理及默认处理
NR3IeTd }
pLIBNo? eygyVhJ ES+&e/G"ds 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。
@.gCeMlOf /@OGYYH,M 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。
rXaL1`t* a@X'oV`(2b 二、编程步骤
Kzmgy14o X31k HK5F_ 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";
"y`?KY$[N Wqqo8Y~fq 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
%Wc-.ER EXzY4D ^ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
PK~okz4b EYQ!ELuF 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
mEqV&M1;7l dxd}:L~z 5、 添加代码,编译运行程序。
0|U<T#t8? Oe=,-\&_ 三、程序代码
6?Wsg`9 fY `A ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
6v1j*' #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
U]P;X~$! #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
vD*KJ3(c #if _MSC_VER > 1000
[;b9'7j' #pragma once
9#agI|d~ #endif // _MSC_VER > 1000
Hnaq+ _] #ifndef __AFXWIN_H__
n[clYi@e #error include 'stdafx.h' before including this file for PCH
Fl
O%OD #endif
?oF@q :W #include "resource.h" // main symbols
4x3`dvfp/ class CHookApp : public CWinApp
Z`f _e? {
^hgpeu public:
9hq 7: CHookApp();
3) 7'dM // Overrides
1n,JynJ // ClassWizard generated virtual function overrides
6-^+btl)# //{{AFX_VIRTUAL(CHookApp)
"3v%| public:
d,>l;l virtual BOOL InitInstance();
/q^( uWu virtual int ExitInstance();
E6US //}}AFX_VIRTUAL
wg[*]_,a //{{AFX_MSG(CHookApp)
dzcPSbbpt // NOTE - the ClassWizard will add and remove member functions here.
'3xSzsDn // DO NOT EDIT what you see in these blocks of generated code !
x^
Wgo`v) //}}AFX_MSG
,p2
Di DECLARE_MESSAGE_MAP()
duM>(y };
,5/gNg LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
\gzNMI* BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
g_q{3PW. BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
HS2)vd@) BOOL InitHotkey();
)oNomsn BOOL UnInit();
&oR&NKk #endif
'J\%JAR@ @B[V'| //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
59)PJ0E #include "stdafx.h"
!nd*U}q #include "hook.h"
RS93_F8 #include <windowsx.h>
"'8$hV65.p #ifdef _DEBUG
[~;9Mi.XL #define new DEBUG_NEW
U@*z#T#"m #undef THIS_FILE
Ufk7%` static char THIS_FILE[] = __FILE__;
[g/g(RL #endif
H<q:+ #define MAX_KEY 100
,JjTzO #define CTRLBIT 0x04
J0x)m2
#define ALTBIT 0x02
Lh0<A% #define SHIFTBIT 0x01
5=$D~>-# #pragma data_seg("shareddata")
/f2*J HHOOK hHook =NULL;
t4Z.b 5g UINT nHookCount =0;
cBAA32wf static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
m3,v&Z static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Rk'pymap static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Xh{EItk~oO static int KeyCount =0;
c-3? D; static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
'tdjPdw #pragma data_seg()
>Qi2;t~G HINSTANCE hins;
)S5Q5"j&=f void VerifyWindow();
2yN~[,L BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
68D.Li //{{AFX_MSG_MAP(CHookApp)
uX p0D$a // NOTE - the ClassWizard will add and remove mapping macros here.
LX3 5Lt // DO NOT EDIT what you see in these blocks of generated code!
S2Wxf>bt2 //}}AFX_MSG_MAP
7N:,F9V< END_MESSAGE_MAP()
#-{4 Jx h qxe CHookApp::CHookApp()
m=#2u4H4 {
)UxF lp;\ // TODO: add construction code here,
oZIoY*7IrQ // Place all significant initialization in InitInstance
BeVQ[ }
a~{mRh r..Rh9v/=E CHookApp theApp;
HWc=.Qq LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
8'f:7KF {
*f,EDSN1@d BOOL bProcessed=FALSE;
+DU}f;O8v if(HC_ACTION==nCode)
=T+<>/[ {
jbG #__#_ if((lParam&0xc0000000)==0xc0000000){// Key up
~< k'{ switch(wParam)
/6f$%:q {
{!<zk+h$ case VK_MENU:
t<Og?m}( MaskBits&=~ALTBIT;
h-6kf:XP% break;
No h*1u* case VK_CONTROL:
h<}4mo_$ MaskBits&=~CTRLBIT;
^c/.D*J[I break;
-ERDW Y case VK_SHIFT:
JWEqy+,Fjw MaskBits&=~SHIFTBIT;
9_&.G4%V break;
QYg2'`( default: //judge the key and send message
x=9drKIw> break;
B>JRta;hj }
iptzVr#b[ for(int index=0;index<MAX_KEY;index++){
X)'uTf0 if(hCallWnd[index]==NULL)
C7nLa@ continue;
i5rAb<q` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
g4U%(3,>D {
zHyM@*Gf( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
[t>}M6?R: bProcessed=TRUE;
4Sw)IU~K( }
['{mW4i }
0Pbv7)=XL }
2o6%P}C else if((lParam&0xc000ffff)==1){ //Key down
LB-4/G$ switch(wParam)
yQ h":"$k {
VJm).>E3k case VK_MENU:
uN'e~X6 MaskBits|=ALTBIT;
Ut0oh break;
aLG6y Vtu case VK_CONTROL:
%\CsP! MaskBits|=CTRLBIT;
P0|V1,) break;
c!j$-Ovm case VK_SHIFT:
hX<0{pXM4 MaskBits|=SHIFTBIT;
S\mh{#Lpk break;
\|Us/_h default: //judge the key and send message
CGPPo;RjK break;
Z?dz@d%C }
7hQrL+%q8 for(int index=0;index<MAX_KEY;index++)
kWF, *@.B {
TVQ9"C if(hCallWnd[index]==NULL)
J](AJkGzK continue;
7RDfhKdb if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
4s%vx]E {
r
5:DIA! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
/wKL"M-% bProcessed=TRUE;
*ewE{$UpK }
l(*`,-pv: }
m{;2! }
}5u$/c@f1 if(!bProcessed){
:<!a.%= for(int index=0;index<MAX_KEY;index++){
ZI}7#K<9X if(hCallWnd[index]==NULL)
e'p'{]r<w continue;
l7n c8K if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
6gNsh SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
3N[t2Y1r }
FG:(H0 }
G-~+F nUC }
8-+Ce;h return CallNextHookEx( hHook, nCode, wParam, lParam );
]haZ T\ }
%?^IS&]Z X`ee}C.D_ BOOL InitHotkey()
Jzo|$W {
(~#{{Ja
if(hHook!=NULL){
t[Qf|#g nHookCount++;
9aHV~5 return TRUE;
gQ6_]~4 }
]oUvC else
r".*l?= hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
z;J"3kM if(hHook!=NULL)
}CIH1q3P nHookCount++;
JUHmIFjZ return (hHook!=NULL);
9rf6,hF }
'H0uvvhOp BOOL UnInit()
k+t?EZ6L {
j KGfm9|zj if(nHookCount>1){
[vrM,?X nHookCount--;
;=fOyg return TRUE;
I<Wp,E9G# }
&s-iie$"@x BOOL unhooked = UnhookWindowsHookEx(hHook);
I6S!-i if(unhooked==TRUE){
UP' ~D]J nHookCount=0;
jJml[iC hHook=NULL;
V:s$V.{! }
ltK\)L return unhooked;
>k }ea5+ }
rO[ cm} 9J+p.N BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
fh,kbn==r? {
]?rVram;z BOOL bAdded=FALSE;
NwP!. for(int index=0;index<MAX_KEY;index++){
r$T\@oTL if(hCallWnd[index]==0){
g(& hu S hCallWnd[index]=hWnd;
'"qTmo! HotKey[index]=cKey;
(E[c-1s HotKeyMask[index]=cMask;
]Dec/Nnj bAdded=TRUE;
y(^t &tgjS KeyCount++;
@G,pM: t break;
^hiIMqY_{` }
@cRR }
lY
-2e> return bAdded;
3dheT}XV?p }
UTwXN |'| t/%{R.1MN BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,a
2(h {
g\%;b3"# BOOL bRemoved=FALSE;
PDQEI55 for(int index=0;index<MAX_KEY;index++){
XB0G7o%1 if(hCallWnd[index]==hWnd){
-Y>,\VEK if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
v]{F.N hCallWnd[index]=NULL;
vxE#6 HotKey[index]=0;
`xv2,Z9< HotKeyMask[index]=0;
UI2TW)^2 bRemoved=TRUE;
/oL&
<e KeyCount--;
M$YU_RPl+ break;
Zaime }
,=>Ws:j }
Z mVw5G
q }
` `mnk>/ return bRemoved;
K-,4eq! }
X(Z~oGyg b'r</ncZ void VerifyWindow()
LY:%k|L9 {
H1Jk_@b for(int i=0;i<MAX_KEY;i++){
LuW>8K\ if(hCallWnd
!=NULL){ `) y<X#[8
if(!IsWindow(hCallWnd)){ 00SYNG!
hCallWnd=NULL; R5Pk>-KF
HotKey=0; pKZRgA#kN
HotKeyMask=0; RW-)({
KeyCount--; 05>mR qVL
} YN]xI
} $;iMo/
} c!0u,6
} Ms=5*_J2Jk
_ck)yY?7
BOOL CHookApp::InitInstance() Ah2*7@U
{ tq$L* ++O
AFX_MANAGE_STATE(AfxGetStaticModuleState()); %plu]^Vy
hins=AfxGetInstanceHandle(); X8 $Y2?<
InitHotkey(); +P! ibHfP
return CWinApp::InitInstance(); MpK3+4UMa
} ES}V\k*}
2]of4
int CHookApp::ExitInstance() t|PQ4g<
{ o|kiwr}Y
VerifyWindow(); {'8td^JEE
UnInit(); o%yfR.M6$
return CWinApp::ExitInstance(); !),eEy
} v*";A
g?.y7!m
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file q\pI&B
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) cslZ;
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4%B0H>
#if _MSC_VER > 1000 Z)&!ZlM
#pragma once ='vD4}"j
#endif // _MSC_VER > 1000 Ko|m<;LX
Y1Q240
class CCaptureDlg : public CDialog k=W~ot&
{ ]z#+3DaH
// Construction 6o0}7T%6
public: &t~NR$@
BOOL bTray; S;0z%$y
BOOL bRegistered; n1U! od
BOOL RegisterHotkey(); \wV^uS
UCHAR cKey; O=[Q>\p
UCHAR cMask; N_^PoX935O
void DeleteIcon(); 5,\-;
void AddIcon(); m#Ydq(0+
UINT nCount; @cr/&
void SaveBmp(); C:AD ZJL
CCaptureDlg(CWnd* pParent = NULL); // standard constructor -aq3Lqi
// Dialog Data ?6Wv["%
//{{AFX_DATA(CCaptureDlg) q4ttmL8
enum { IDD = IDD_CAPTURE_DIALOG }; R-Ys<;
CComboBox m_Key; Q7.jSL6
BOOL m_bControl; 2YDD`:R
BOOL m_bAlt; x2,;ar\D
BOOL m_bShift; h2-v.Tjf
CString m_Path; }_Ci3|G>%D
CString m_Number; 7qSnP30}
//}}AFX_DATA ;E_Go&Vd
// ClassWizard generated virtual function overrides " Tk,
//{{AFX_VIRTUAL(CCaptureDlg) K0W X($z~;
public: 0tz? sN
virtual BOOL PreTranslateMessage(MSG* pMsg); Ze!/b|`xI
protected: q`'m:{8
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support cQkj{u
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); )K8^}L,
//}}AFX_VIRTUAL CcTdLq
// Implementation :7M%/#Fy
protected: l 88n*O
HICON m_hIcon; :_,a%hb+8
// Generated message map functions 9Af nMD
//{{AFX_MSG(CCaptureDlg) ~47 0LgpO1
virtual BOOL OnInitDialog(); **$kWbS
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -9~$Ll+2h
afx_msg void OnPaint(); >V?W_oM)
afx_msg HCURSOR OnQueryDragIcon(); blLl1Ak
virtual void OnCancel(); H&8~"h6n
afx_msg void OnAbout(); s#'Vasu
afx_msg void OnBrowse(); 8BrC@L2E0
afx_msg void OnChange(); Egz6rRCvg
//}}AFX_MSG 1Ys)b[:
DECLARE_MESSAGE_MAP() \QQWh wE
}; &xt[w>/i
#endif w~_ycY.e
7'OR;b$
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file *
V7bALY
#include "stdafx.h" ^&\pY
#include "Capture.h" qnHjw Mi
#include "CaptureDlg.h" ]x).C[^
#include <windowsx.h> ce;$)Ff\
#pragma comment(lib,"hook.lib") ^OV!Q\j.q
#ifdef _DEBUG lN&+<>a
#define new DEBUG_NEW VX*+:
#undef THIS_FILE T
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static char THIS_FILE[] = __FILE__; ] g<$f#S
#endif $EHFf$M
#define IDM_SHELL WM_USER+1 ub!lHl
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "n{';Q)
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ZbiC=uh
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; q44vI
class CAboutDlg : public CDialog WJxcJE
{ a x)J!I18
public: p TaC$Ne
CAboutDlg(); y4! :l=E^
// Dialog Data 7Vk9{x$z
//{{AFX_DATA(CAboutDlg) UD8e,/
enum { IDD = IDD_ABOUTBOX }; 5t-d+vB
//}}AFX_DATA 6ddRFpe
// ClassWizard generated virtual function overrides bo/<3gR
//{{AFX_VIRTUAL(CAboutDlg) o~9sO=-O
protected: 7IFZK\V
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support wpp!H<')
//}}AFX_VIRTUAL \03<dUA6
// Implementation }Ml BmD
protected: E=8GSl/Jx
//{{AFX_MSG(CAboutDlg) uF|Up]Z G
//}}AFX_MSG kOdA8XRY
DECLARE_MESSAGE_MAP() !VaC=I^{
}; Q>$lf.)
1ni72iz\
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ur E7ZKdI
{ n&o"RE 0~0
//{{AFX_DATA_INIT(CAboutDlg) t*; KxQ+'?
//}}AFX_DATA_INIT ?hAO-*);
} YcV^Fqi!
w >%^pO~}`
void CAboutDlg::DoDataExchange(CDataExchange* pDX) BQ<\[H;
{ VxS3lR=
CDialog::DoDataExchange(pDX); l]~9BPsR
//{{AFX_DATA_MAP(CAboutDlg) n!AW9]
//}}AFX_DATA_MAP p^}`^>OL
} $UdBZT-
Tt9cX}&&
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) k q]E@tE*3
//{{AFX_MSG_MAP(CAboutDlg) {]U
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// No message handlers [3sZ=)G
//}}AFX_MSG_MAP E<}sGzMc
END_MESSAGE_MAP() e v0>j4Q
8ki3>"!A
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 6;\1bP?
: CDialog(CCaptureDlg::IDD, pParent)
0Gc:+c7{
{ YM#MfL#
//{{AFX_DATA_INIT(CCaptureDlg) wfe4b
m_bControl = FALSE; w N`Njm9!
m_bAlt = FALSE; ~\2%h
lA
m_bShift = FALSE; r~JGs?GH
m_Path = _T("c:\\"); )t3`O$J
m_Number = _T("0 picture captured."); C-)d@LWI
nCount=0; PH&Qw2(Sx
bRegistered=FALSE; TDbSK&w :s
bTray=FALSE; >itNa.K
//}}AFX_DATA_INIT
;~L,Aqn7
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 5073Q~
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6$:Q]zR#'H
} DA iS|x
x#&_/oqAk
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) jjQDw=6
{ q9p31b3
CDialog::DoDataExchange(pDX); TBrwir
//{{AFX_DATA_MAP(CCaptureDlg) D
vvi)/<
DDX_Control(pDX, IDC_KEY, m_Key); 4X*U~}
DDX_Check(pDX, IDC_CONTROL, m_bControl); }apno|W&
DDX_Check(pDX, IDC_ALT, m_bAlt); k H<C9z2=
DDX_Check(pDX, IDC_SHIFT, m_bShift); XN6$TNsD$
DDX_Text(pDX, IDC_PATH, m_Path); 1<Mb@t
DDX_Text(pDX, IDC_NUMBER, m_Number); < qab\M0W
//}}AFX_DATA_MAP ]P#W\LZp
} :!Dm,PP%
Y3~z#<
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) K?[Vz[-Fc
//{{AFX_MSG_MAP(CCaptureDlg) KAD2_@l
ON_WM_SYSCOMMAND() h,B4Tg'
ON_WM_PAINT() Cse`MP
ON_WM_QUERYDRAGICON() ?>{u@tYL
ON_BN_CLICKED(ID_ABOUT, OnAbout) T@{ab1KV
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Y 'm;xA
ON_BN_CLICKED(ID_CHANGE, OnChange) ]\ !ka/%
//}}AFX_MSG_MAP +6l#hO7h
END_MESSAGE_MAP() P_0[spmFU
9xj }<WM
BOOL CCaptureDlg::OnInitDialog() g 8uq6U
{ iZiT/#, H2
CDialog::OnInitDialog(); EI*~VFx
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); P
qC#[0Qy
ASSERT(IDM_ABOUTBOX < 0xF000); +jZa A/
CMenu* pSysMenu = GetSystemMenu(FALSE); ;,6C&|n]w
if (pSysMenu != NULL) -0<vmU
{ sbX7VfAR`
CString strAboutMenu; C|Y[T{g?t
strAboutMenu.LoadString(IDS_ABOUTBOX); nA_'jl
if (!strAboutMenu.IsEmpty()) Zk lpnL*!
{ 0{%@"Fb0O
pSysMenu->AppendMenu(MF_SEPARATOR); QW,:'\G
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ME0u|_dPjz
} )=()
} ]|PTZ1?j
SetIcon(m_hIcon, TRUE); // Set big icon pZeOdh
SetIcon(m_hIcon, FALSE); // Set small icon S>h\D4.
m_Key.SetCurSel(0); -C(Yl=
RegisterHotkey(); $:oC\K6
CMenu* pMenu=GetSystemMenu(FALSE); MZX)znO
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 0;T7fKj
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); I}o}
#OJ
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); L~)8Q(f
return TRUE; // return TRUE unless you set the focus to a control +D4m@O
} qD\9h`a
H"^9g3U
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) f OR9 N/
{ sRZ<c
if ((nID & 0xFFF0) == IDM_ABOUTBOX) F(."nUrf
{ _0gdt4
CAboutDlg dlgAbout; axt;}8
dlgAbout.DoModal(); ]S]W|m7=.Z
} 8rS;}Bt
else e(a,nZF.
{ #BcUE?K*N
CDialog::OnSysCommand(nID, lParam); 41d+z>a]
} <z2.A/L
} 6'N_bNW
QtG6v<A
void CCaptureDlg::OnPaint() zI,Qc60B
{ Y DHP-0?
if (IsIconic()) (pv}>1
{ XD8I.q
CPaintDC dc(this); // device context for painting onRTX|#
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ,G46i)E\
// Center icon in client rectangle aXq ig&:
int cxIcon = GetSystemMetrics(SM_CXICON); 'Ca;gi !U
int cyIcon = GetSystemMetrics(SM_CYICON); ;b=diZE
CRect rect; R= mTJ'y
GetClientRect(&rect); @$^4Av-
int x = (rect.Width() - cxIcon + 1) / 2; $ .$nv~f
int y = (rect.Height() - cyIcon + 1) / 2; 5EVypw?]x
// Draw the icon hZ>m:es
dc.DrawIcon(x, y, m_hIcon); KWjhkRK4]
} g9JZ#B gZ
else <EgJm`V
{ {_*G"A 9
CDialog::OnPaint(); b(R.&X
} ko[d axUB
} =hb)e}l
fPKpV`Hr3
HCURSOR CCaptureDlg::OnQueryDragIcon() U`EOun,
{ _+aR|AEC
return (HCURSOR) m_hIcon; '{.4~:
} 4.wrY6+V
%5zIh[!1$
void CCaptureDlg::OnCancel() @w.DN)GPo
{ L>1y[
Q
if(bTray) wGT>Xh!
DeleteIcon(); gt.F[q3
CDialog::OnCancel(); ;>6~}lMgJ
} O.QR1
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void CCaptureDlg::OnAbout() L-}Uj^yF
{ pGR3
CAboutDlg dlg; `i(b%$|^&Z
dlg.DoModal(); O/Hj-u6&A
} Ad-5Znc5
z\UXnRL
void CCaptureDlg::OnBrowse() xFThs,w
{ i ?M-~EKu
CString str; n.'Ps+G(
BROWSEINFO bi; R\7r!38
char name[MAX_PATH]; 1,OkuyXy!>
ZeroMemory(&bi,sizeof(BROWSEINFO)); R+K|K2"
bi.hwndOwner=GetSafeHwnd(); S&IW]ffK
bi.pszDisplayName=name; gfIS
bi.lpszTitle="Select folder"; Z&iW1
bi.ulFlags=BIF_RETURNONLYFSDIRS; YuVlD/
LPITEMIDLIST idl=SHBrowseForFolder(&bi); wzxV)1jT
if(idl==NULL) #W8?E_iu
return; }AB_i'C0
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); KGc.YUoE
str.ReleaseBuffer(); J
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m_Path=str; ]9w8[T:O
if(str.GetAt(str.GetLength()-1)!='\\') %{ rb,6
m_Path+="\\"; zGz}.-F
UpdateData(FALSE); wN%lc3[/z2
} (G./P@/[
sm{0o$\Z
void CCaptureDlg::SaveBmp() A_E2v{*n
{ FCwE/ 2,
CDC dc; yevJA?C4 v
dc.CreateDC("DISPLAY",NULL,NULL,NULL); iJoYxx
CBitmap bm; `<v$+mG
int Width=GetSystemMetrics(SM_CXSCREEN); Z}vDP^rf
int Height=GetSystemMetrics(SM_CYSCREEN); &{<hY|%
bm.CreateCompatibleBitmap(&dc,Width,Height); W*_c*
CDC tdc; <N~9=g3
tdc.CreateCompatibleDC(&dc); +UX~'t_'v
CBitmap*pOld=tdc.SelectObject(&bm); v,QvCozOz
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Vrlqje_Q
tdc.SelectObject(pOld); tw
zV-8\
BITMAP btm; RR+kjK?
bm.GetBitmap(&btm); P/WGB~NH
DWORD size=btm.bmWidthBytes*btm.bmHeight; @uV]7d"z(
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); M1NdlAAf
BITMAPINFOHEADER bih; 6[R6P:v&'G
bih.biBitCount=btm.bmBitsPixel; !Z\Gv1
bih.biClrImportant=0; 3`{
vx
bih.biClrUsed=0; ^`SEmYb;
bih.biCompression=0; }s'=w]m
bih.biHeight=btm.bmHeight; GLZ*5kw
bih.biPlanes=1; NhNd+SCZ@
bih.biSize=sizeof(BITMAPINFOHEADER); y!x[N!a
bih.biSizeImage=size; M"p%CbcI]
bih.biWidth=btm.bmWidth; Pke8RLg2A
bih.biXPelsPerMeter=0; oO3^9?Z
bih.biYPelsPerMeter=0; svxjad@l/
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); V*2*5hx
static int filecount=0; {4/*2IRN9h
CString name; d&|5Rk
~
name.Format("pict%04d.bmp",filecount++); 4 Cd5-I
name=m_Path+name; 7_j t =sr
BITMAPFILEHEADER bfh;
n=~!x
bfh.bfReserved1=bfh.bfReserved2=0; <{;'0> ToM
bfh.bfType=((WORD)('M'<< 8)|'B'); @oH\r-jsgu
bfh.bfSize=54+size; .XeZjoJ$z
bfh.bfOffBits=54; 7\yh(+ kN
CFile bf; Wvu1?
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ,ZY\})`p
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9-_Lc<
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); q&?hwX
Z7
bf.WriteHuge(lpData,size); AsuugcN*
bf.Close(); z(.,BB[
nCount++; ^["D>@yIR
} s.;'-oA
GlobalFreePtr(lpData); kxEq_FX
if(nCount==1) wX6-WQR
m_Number.Format("%d picture captured.",nCount); ^q& Rl\
else 7CF>cpw
m_Number.Format("%d pictures captured.",nCount); ^pew'pHQ
UpdateData(FALSE); ^:ny
} `~lG5|
]:2Ro:4Yv
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) D'ZUbAh!
{ ZRw^<
+
if(pMsg -> message == WM_KEYDOWN) kRwY#
{ bk=;=K
if(pMsg -> wParam == VK_ESCAPE) dZ*&3.#D5
return TRUE; V,c^Vqy
if(pMsg -> wParam == VK_RETURN) '?.']U,: $
return TRUE; 5$>buYF
} S[y_Ewzq
return CDialog::PreTranslateMessage(pMsg); 0<4'pO.6Hq
} Z<AZO ^
bYem0hzOe
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @C[p? ak
{ k^;/@:
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ d^tY?*n
SaveBmp(); '
i5}`\
return FALSE; bcuUej:
} VFnxj52<
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ C{t}q*fG
5
CMenu pop; Oi~Dio_?
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); G[>CBh5
CMenu*pMenu=pop.GetSubMenu(0); P<[)
qq@;
pMenu->SetDefaultItem(ID_EXITICON); @~7au9.V=X
CPoint pt; =2rdbq6R
GetCursorPos(&pt); sD?Ynpt
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); HL$7Ou
if(id==ID_EXITICON) p(4B"[ !S
DeleteIcon(); T.;U~<
else if(id==ID_EXIT) ?kV_!2U)'K
OnCancel(); Uh1UZ
r
return FALSE; ';.y`{/
} }c=Y<Cdh
LRESULT res= CDialog::WindowProc(message, wParam, lParam); !J {[XT
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) vg X7B4
AddIcon(); z$g__q-
return res; y!S:d
} = 4|"<8'
4/3w
*
void CCaptureDlg::AddIcon() \f Kn} ]kG
{ ei1;@k/
NOTIFYICONDATA data; b"td]H3h
data.cbSize=sizeof(NOTIFYICONDATA); %Rr_fSoV
CString tip; 9|@5eN:N
tip.LoadString(IDS_ICONTIP); /&@q*L
data.hIcon=GetIcon(0); y9@j-m&
data.hWnd=GetSafeHwnd(); wNFx1u^/)
strcpy(data.szTip,tip); >XuPg(Ow
data.uCallbackMessage=IDM_SHELL; }9z$72;Qdq
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; u9c^YC BM
data.uID=98; HKOSS-`5
Shell_NotifyIcon(NIM_ADD,&data); 2t?>0)*m
ShowWindow(SW_HIDE); wXdt\@Qr
bTray=TRUE; =mcQe^M
} n
>E1\($
*N{k#d/
void CCaptureDlg::DeleteIcon() u!It';j
{ {Ngut
NOTIFYICONDATA data; pxyFM@Z](
data.cbSize=sizeof(NOTIFYICONDATA); Ho&f[T(
data.hWnd=GetSafeHwnd(); S @!z'$&
data.uID=98; aDLlL?r3
Shell_NotifyIcon(NIM_DELETE,&data); j2:9ahW
ShowWindow(SW_SHOW); ?wIEXKI
SetForegroundWindow(); s6;ZaU
ShowWindow(SW_SHOWNORMAL); tdu:imH~
bTray=FALSE; ehe#"exCB
} n1R{[\ >1
S&cN+r
void CCaptureDlg::OnChange() 5yV>-XT+-
{ mQU t 'j4
RegisterHotkey(); .]<iRf[\[
} G2>s#Y5(,
C4dCaiX
BOOL CCaptureDlg::RegisterHotkey() G$/Qcr6W<
{ Rf=-Q
%
UpdateData(); $|!3ks
UCHAR mask=0; HG5E,^1n
UCHAR key=0; 1[a#blL6W
if(m_bControl) *9F{+)A
mask|=4; awQB0ow'$P
if(m_bAlt) 28}L.>5k
mask|=2; 8yZs>Og?
if(m_bShift) zY4y]k8D*
mask|=1; Fy6Lz.baB
key=Key_Table[m_Key.GetCurSel()]; ?g*.7Wc
if(bRegistered){ L0%W;m
DeleteHotkey(GetSafeHwnd(),cKey,cMask); W ,]Ua]
bRegistered=FALSE; dd6l+z
} s!F8<:FRJD
cMask=mask; Fs=E8' b
cKey=key; H~ >\HV*
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Tz\v.&? $
return bRegistered; Q;m8 drU
} ?c fFJl
nx{X^oc8e
四、小结 K\lu;
)U}`x }:,
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。