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:
HYD"#m'TkB
f.
FYR|%tq 一、实现方法
M#~Cc~oT w:?oTuw 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:
'bo~%WA]n X LL/4 ) #pragma data_seg("shareddata")
|!"2fI HHOOK hHook =NULL; //钩子句柄
L{(QpgHZ UINT nHookCount =0; //挂接的程序数目
#B:hPZM1 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
\ gLHi~ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
|b*?
qf static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
^4,a 8` static int KeyCount =0;
)hk static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
tI7:5Cm #pragma data_seg()
G3rj`Sg^c hi0R.V& 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。
L+CyQq TZ2=O<Kj 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:
:'*DPB- 4dhvFGlW BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
`67[O4$< cKey,UCHAR cMask)
d)pV;6%[$q {
QF&W`c BOOL bAdded=FALSE;
!zPa_`P for(int index=0;index<MAX_KEY;index++){
Db6om7N if(hCallWnd[index]==0){
|\U5),m hCallWnd[index]=hWnd;
W2z*91$ HotKey[index]=cKey;
Sp}tD<V HotKeyMask[index]=cMask;
N_pJk2E bAdded=TRUE;
1qf!DMcdZ KeyCount++;
oiX+l5`pz break;
tl><"6AIP }
7{I h_.# }
1[jb)j1 return bAdded;
|i ZfYi&^ }
t`+'r}=d //删除热键
h}]fnA BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
K^B%/T]d {
J,zO2572u BOOL bRemoved=FALSE;
Q" ,0F{' for(int index=0;index<MAX_KEY;index++){
v76D3'8 if(hCallWnd[index]==hWnd){
e0J6Ae4V[ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
z,VD=Hnz hCallWnd[index]=NULL;
LrATSq@ HotKey[index]=0;
Ma+$g1$ HotKeyMask[index]=0;
QK+(g,)_86 bRemoved=TRUE;
ed:@C? KeyCount--;
Z7RiPSdxp break;
+3&zN( }
qA!]E^0*Ke }
glDh([ }
MW PvR|Q return bRemoved;
2 ho>eRX }
)=-0M9e.{ KID,|K A0Zt8>w DLL中的钩子函数如下:
\#rIQOPl? Vo7dAHHL LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
%s&ChM?8F {
;\[(- )f!= BOOL bProcessed=FALSE;
y|Ir._bt if(HC_ACTION==nCode)
8,atX+tc {
r" K':O6y if((lParam&0xc0000000)==0xc0000000){// 有键松开
k<cgO[m switch(wParam)
L*Me."* {
#hlCs case VK_MENU:
^k
Cn*& MaskBits&=~ALTBIT;
|QMhMGjV break;
V=lfl1Ev0J case VK_CONTROL:
I8QjKI ( MaskBits&=~CTRLBIT;
l983vKr break;
x ul]m*Z case VK_SHIFT:
IXb}AxBf MaskBits&=~SHIFTBIT;
r YF #^ break;
i,|0@Vy default: //judge the key and send message
OQ,NOiNkap break;
?_v{|
YI= }
aDehqP6vf for(int index=0;index<MAX_KEY;index++){
@c~)W8 if(hCallWnd[index]==NULL)
y2+p1 continue;
MSV2ip3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
A.D{.a {
gd0Vp Xf' SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
|,aG%MTL bProcessed=TRUE;
1]}#)- }
Y2O"]phi@ }
8HZs>l }
lhi_6&&[8 else if((lParam&0xc000ffff)==1){ //有键按下
;r6jx"i switch(wParam)
Nr0
(E {
9{$'S4 case VK_MENU:
Vp<seO;7o MaskBits|=ALTBIT;
LC})ciWa break;
ru`U' case VK_CONTROL:
9W8]8sUeG MaskBits|=CTRLBIT;
%J8|zKT5t break;
gN>2xnh'm case VK_SHIFT:
r@{~ 5&L MaskBits|=SHIFTBIT;
,&d@O>$E: break;
A"aV'~> default: //judge the key and send message
Dk='+\ break;
Q0\0f }
jn:NYJv for(int index=0;index<MAX_KEY;index++){
;P;((2_X9 if(hCallWnd[index]==NULL)
Hk7q{`:N continue;
{VP$J"\e if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
k64."*X {
TI !a )X SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
|TE}`?y[g bProcessed=TRUE;
~h"/Tce }
8`b`QtGf }
.7
asW( }
*c)uGz'cD
if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
$46{<4. for(int index=0;index<MAX_KEY;index++){
-!)xQvagD. if(hCallWnd[index]==NULL)
x)UwV continue;
&h~Xq^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
:d8W+|1u SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
cv(PP-'\ //lParam的意义可看MSDN中WM_KEYDOWN部分
{,cCEXag% }
k/03ZxC- }
jt@SZI` }
#eN{!Niy&U return CallNextHookEx( hHook, nCode, wParam, lParam );
,KJw|x4}\ }
@
a4/ELx e;GU
T: 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:
2..,Sk ~Xlrvb}LP BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
x'zBK0i BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
)XfzLF7 HAYMX:% 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:
Jjl%R[mI ms_ VM>l LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
`+#G+Vu5 {
[Px'\nVf if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
}P3tn {
O,<IGO //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
O'GG Ti]e SaveBmp();
vfB2XVc return FALSE;
+f0~D(d!_ }
+x]9+D& …… //其它处理及默认处理
lc6iKFyG }
h8G5GRD u4"SH( Uu 7dSU 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。
i-U4RZE za'6Y*CGgX 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。
1 ^g
t1o |+U<S~ 二、编程步骤
f(D_FTTO ]MtFf6& 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";
gq"k<C0 3u>8\|8wz 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
h7X_S4p/Mg $ \*`
}Y 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;
|xoF49 Cv)/7vyB8 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;
(]*H[)F/ q4UA]+-* 5、 添加代码,编译运行程序。
NA$zd( j%V["?) 三、程序代码
)c/Fasfg[P |KY EK| ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
"&Qctk`<P #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
L5IbExjV #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
<As9>5|% #if _MSC_VER > 1000
g`k?AM\ #pragma once
)U:2z-X&e #endif // _MSC_VER > 1000
]ALc;lb-} #ifndef __AFXWIN_H__
QFPfIb/ #error include 'stdafx.h' before including this file for PCH
O;HY% #endif
L?Yoh< #include "resource.h" // main symbols
N:VX!w class CHookApp : public CWinApp
%b?$@H-Re {
^")F7`PF public:
]=73-ywn] CHookApp();
d {2 // Overrides
mgZf3?,) // ClassWizard generated virtual function overrides
1x~U*vbhQ //{{AFX_VIRTUAL(CHookApp)
`A/j1UWJ public:
wzjU,Mwe virtual BOOL InitInstance();
w>xV virtual int ExitInstance();
]+DI.% //}}AFX_VIRTUAL
V2|3i}V" //{{AFX_MSG(CHookApp)
4*Z6}" // NOTE - the ClassWizard will add and remove member functions here.
_kFYBd // DO NOT EDIT what you see in these blocks of generated code !
K:y^OAZfV //}}AFX_MSG
7?"y{R>E DECLARE_MESSAGE_MAP()
3}1ssU"T };
l]2r)!Q7 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
4y}"Hy BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
HjWq[[Nz BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
=wi*Nd7L BOOL InitHotkey();
t j Vh^ BOOL UnInit();
VyG4(Xva #endif
)<4_: \nrP$ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Q}A=jew #include "stdafx.h"
aaWJ*
>rJ #include "hook.h"
UFn8kBk #include <windowsx.h>
M~6@20$oW #ifdef _DEBUG
O$!*%TL #define new DEBUG_NEW
(y4#.vZh: #undef THIS_FILE
o=fgin/E\ static char THIS_FILE[] = __FILE__;
smAC,-6]~ #endif
^a9 oKI9n #define MAX_KEY 100
_'x8M #define CTRLBIT 0x04
^b?2N/m@ #define ALTBIT 0x02
>
^[z3T #define SHIFTBIT 0x01
PHM:W%g: #pragma data_seg("shareddata")
IF
k HHOOK hHook =NULL;
t@bt6J .{ UINT nHookCount =0;
!$XHQLqF2 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
ZC^C static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
}b["Jk\2 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
q W^vz static int KeyCount =0;
?Ce#BwQ> static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Vs0 SXj #pragma data_seg()
I12KT~z<r HINSTANCE hins;
7_KhV void VerifyWindow();
(d2@Mz BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
q$ghLGz //{{AFX_MSG_MAP(CHookApp)
\Mx
JH[ // NOTE - the ClassWizard will add and remove mapping macros here.
r@)A
k // DO NOT EDIT what you see in these blocks of generated code!
@u4=e4eF` //}}AFX_MSG_MAP
? S=W& END_MESSAGE_MAP()
^gro=Bp( S9Y[4*// CHookApp::CHookApp()
K3$`
Kv>I {
_EYB
8e // TODO: add construction code here,
rE!1wc>L // Place all significant initialization in InitInstance
MXAEX2xmme }
&w~Xa( uu 0??Yr CHookApp theApp;
17UK1Jx, LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
R 4EEelSZu {
uf) Oy7FQ BOOL bProcessed=FALSE;
JSMPyj if(HC_ACTION==nCode)
p_terD: {
J0<p4%Cf if((lParam&0xc0000000)==0xc0000000){// Key up
W 5DbFSgB switch(wParam)
CSn<]%GL {
.5tg4%l case VK_MENU:
ddpl Pzm# MaskBits&=~ALTBIT;
nf%4sIQ*x break;
7$T8&Mh case VK_CONTROL:
]gd/}m)1 MaskBits&=~CTRLBIT;
)q?$p9 break;
@]
.VQ<X|0 case VK_SHIFT:
ML!9:vz MaskBits&=~SHIFTBIT;
{/M\Q@j break;
r:.uBc&_ default: //judge the key and send message
j64 4V|z break;
$@[)nvV\ }
} ~enEZ for(int index=0;index<MAX_KEY;index++){
5h_5Z~ if(hCallWnd[index]==NULL)
Uxl(9 6 continue;
pVokgUrC if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$-pbw@7 {
mc@M ,2@D SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
nX
x=1*X bProcessed=TRUE;
iK}v`xq }
.;Y
x*] }
WVL#s?=g }
2>y:N. else if((lParam&0xc000ffff)==1){ //Key down
@5Qoi~o switch(wParam)
B%b_/F]e {
fNhT;Bux
case VK_MENU:
,?b78_,2 MaskBits|=ALTBIT;
V,4.$<e break;
6Dzs? P case VK_CONTROL:
%O) Z MaskBits|=CTRLBIT;
af>3V( 7 break;
N~#D\X^t. case VK_SHIFT:
,nE&MeJ MaskBits|=SHIFTBIT;
j 2}v} break;
(wL3 + default: //judge the key and send message
Gp1EJ2d8 break;
m6so]xr }
1Ii| {vR for(int index=0;index<MAX_KEY;index++)
ph^4GBR {
4]BJ0+|mT if(hCallWnd[index]==NULL)
nP_=GI continue;
p?Sl}A@` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Zc\S$+PM {
dq8+m(7k SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
~/c5hyTx bProcessed=TRUE;
~zMKVM1Q., }
mU]s7` %<> }
-Cj_B\ }
z> :U{!5k if(!bProcessed){
>(tO
QeN for(int index=0;index<MAX_KEY;index++){
b>=7B6 Aw if(hCallWnd[index]==NULL)
{})y^L continue;
IQ{?_' if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
UX}*X`{ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
8eww7k^R }
=HPu{K$ }
a/e\vwHLv }
Y+qus return CallNextHookEx( hHook, nCode, wParam, lParam );
TzY!D*%z }
,kE=TR.| Tf l;7w.(A BOOL InitHotkey()
B! `\L! {
+!$dO'0nt, if(hHook!=NULL){
:@e\'~7sH nHookCount++;
GN%<"I. return TRUE;
MgnE-6_c }
0^iJlR2 else
44Qk;8* hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
OX)BP.h# if(hHook!=NULL)
"yri[X nHookCount++;
TolrEcI return (hHook!=NULL);
+E#PJ_H=F8 }
Vj7Hgc-, BOOL UnInit()
nt`<y0ta {
9RcM$[~ if(nHookCount>1){
;&`:|Hf* nHookCount--;
`(T!>QVW+g return TRUE;
&<{}8/x8( }
YAMfP8S BOOL unhooked = UnhookWindowsHookEx(hHook);
Xoi9d1fO if(unhooked==TRUE){
vTcZ8|3 e nHookCount=0;
&?}1AQAYg hHook=NULL;
@Y NGxg~*g }
W^|J/Y48 return unhooked;
#XL`S }
-#Jj-t_Fe ]c,l5u}A$ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
s<#N]mp' {
r$?Vx_f`Q BOOL bAdded=FALSE;
M/)B" q for(int index=0;index<MAX_KEY;index++){
*s36OF! if(hCallWnd[index]==0){
J;HkTT hCallWnd[index]=hWnd;
S]b
xQa+ HotKey[index]=cKey;
F#^L9 HotKeyMask[index]=cMask;
M)tv;!eQ bAdded=TRUE;
UC;=) KeyCount++;
x {vIT- f break;
-PXoMZx% }
7A[Ogro }
jRwa0Px( return bAdded;
mOSCkp{<e }
mc~` 6.UKB<sV BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
1::LN(`< {
K
/8qB~J* BOOL bRemoved=FALSE;
6*V8k%H for(int index=0;index<MAX_KEY;index++){
}2mI*"%)\u if(hCallWnd[index]==hWnd){
lkN'uZ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
E7gL~4I hCallWnd[index]=NULL;
*CT.G'bQX HotKey[index]=0;
Bj+wayMi HotKeyMask[index]=0;
PgTDjEo bRemoved=TRUE;
YkVRl [ KeyCount--;
@7]\y7D break;
p&m
^IWD }
_Z0\`kba+ }
`+Xe'ey }
c-|kv[\a return bRemoved;
\E~Q1eAJT }
|thad!? CJ:uYXJJ:z void VerifyWindow()
8eN%sm {
rF'<r~Lw for(int i=0;i<MAX_KEY;i++){
>waN;&>/ if(hCallWnd
!=NULL){ k5g@myb-
if(!IsWindow(hCallWnd)){ "TUPYFK9
hCallWnd=NULL; |C|:i@c
H
HotKey=0; +{'lZa
HotKeyMask=0; R^|!^[WE
KeyCount--; 9Dy)nm^
} {DSyV:
} ` -yhl3si
} cJ2y)`
} %5`r-F
+fkP+RVY
BOOL CHookApp::InitInstance() QT7_x`#J~o
{ \y@ eBW
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 8KZ$F>T]>
hins=AfxGetInstanceHandle(); Pb3EnNqYbM
InitHotkey(); w}"!l G
return CWinApp::InitInstance(); |E?
,xWN
} |c=d;+
J/L)3y
int CHookApp::ExitInstance() +&(Jn
{ g&q^.7c}
VerifyWindow(); 8b{U
tT
UnInit(); yg`E22
return CWinApp::ExitInstance(); /%-o.hT
} FzA{UO
bd.j,4^
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Q})t<l+L
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3g^IXm:K$
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ PVZEB
#if _MSC_VER > 1000 9x4wk*z
#pragma once +BU0 6lLD
#endif // _MSC_VER > 1000 B*32D8t`u
j-j'ph K
class CCaptureDlg : public CDialog RFhU#
{ <` #,AVH
// Construction f(^33k
public: ^NY+wR5Sn
BOOL bTray; 7xz#D4[
BOOL bRegistered; |}:e+?{o
BOOL RegisterHotkey(); Zp^)_ 0
UCHAR cKey; 1V#0\1sj
UCHAR cMask; 8rla0d@
void DeleteIcon(); +}&pVe\t
void AddIcon(); t;h+Cf4
UINT nCount; r$94J'_
void SaveBmp(); }{P&idkv
CCaptureDlg(CWnd* pParent = NULL); // standard constructor <.;@ksCPW{
// Dialog Data vM5k4%D
//{{AFX_DATA(CCaptureDlg) (H'_KPK
enum { IDD = IDD_CAPTURE_DIALOG }; G[ ,,L
CComboBox m_Key; ?Ozk^#H[
BOOL m_bControl; i:MlD5 F
BOOL m_bAlt; 1hF2eNh
BOOL m_bShift; \o0z@Ntq
CString m_Path; |}l@w+N3
CString m_Number; M0Lon/%
//}}AFX_DATA b (g_.1[
// ClassWizard generated virtual function overrides 6'S5sRA
//{{AFX_VIRTUAL(CCaptureDlg) YCtIeq%
public: ": mCZUt
virtual BOOL PreTranslateMessage(MSG* pMsg); ]kyle3#-~
protected: pHq{S;R2G
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .WxFm@]/\
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); s$K@X `
//}}AFX_VIRTUAL z?8zFP
// Implementation J,CJPUf&
protected: /+Wb6{lY
HICON m_hIcon; S~]8K8"sT
// Generated message map functions n P0Ziu'{
//{{AFX_MSG(CCaptureDlg) C~3@M<X
virtual BOOL OnInitDialog(); a.5zdoH_
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); b>GqNf!
afx_msg void OnPaint(); >^M!@=/?J
afx_msg HCURSOR OnQueryDragIcon(); mABwM$_
virtual void OnCancel(); ?FkQe~FN{
afx_msg void OnAbout(); at_dmU2[7
afx_msg void OnBrowse(); JrY"J]/
afx_msg void OnChange(); 9{auleu
R
//}}AFX_MSG B iVd
ka
DECLARE_MESSAGE_MAP() 8#[%?}tK
}; AT2NC6{M
#endif 8 /:X&
&
mBYS"[S(
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {s9y@c*15.
#include "stdafx.h" :
OSmr
#include "Capture.h" Dx9$H++6$X
#include "CaptureDlg.h" | 7t=\
#include <windowsx.h> )Mm;9UA
#pragma comment(lib,"hook.lib") w*|= k~z
#ifdef _DEBUG Sn{aHH
#define new DEBUG_NEW l4R<`b\Jt
#undef THIS_FILE eH"qI2A
static char THIS_FILE[] = __FILE__; 5$(b3]
#endif 'fp<FeTg
#define IDM_SHELL WM_USER+1 NgDZ4&L
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); eLe,=
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
75QXkJu
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [|c@Yw
class CAboutDlg : public CDialog j]cXLY
{ A8A:@-e8A
public:
KT]J,b
CAboutDlg(); H| eD/6K
// Dialog Data N]O{T_5-0
//{{AFX_DATA(CAboutDlg) GN~[xXJU
enum { IDD = IDD_ABOUTBOX }; E@\d<c.
//}}AFX_DATA Q"l"p:n%n
// ClassWizard generated virtual function overrides I_jM-/3b
//{{AFX_VIRTUAL(CAboutDlg) RE(=! 8lGR
protected:
f4A4
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $?CBX27AV
//}}AFX_VIRTUAL qr<-eJf
// Implementation UH1S_:6
protected: ;r0|_mnf
//{{AFX_MSG(CAboutDlg) 0|K/=dh5+
//}}AFX_MSG 4EaSg#
DECLARE_MESSAGE_MAP() .O@q5G
}; !#_h2a
o|p;6
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) KV)Hywl`
{ mTI\,x%<OC
//{{AFX_DATA_INIT(CAboutDlg) $)kBz*C[
//}}AFX_DATA_INIT }
Y7W1$he
} =: v><
VDb,$i.Z0
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 8VAYIxRv
{ 6B!j(R
CDialog::DoDataExchange(pDX); E9Qd>o
//{{AFX_DATA_MAP(CAboutDlg) D:RBq\8
//}}AFX_DATA_MAP u+I r:k
} /w}B07.
[EW$7 se~
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) )$Dcrrj
//{{AFX_MSG_MAP(CAboutDlg) N c&i) qh
// No message handlers .5#tB*H
//}}AFX_MSG_MAP |R
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END_MESSAGE_MAP() uZ=UBir
g~$GE},,
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @FnI?Rx
: CDialog(CCaptureDlg::IDD, pParent) 7am/X.
{ >TQBRA;'
//{{AFX_DATA_INIT(CCaptureDlg) GP7)m
m_bControl = FALSE; >TY5ZRB
m_bAlt = FALSE; fW4cHB9|
m_bShift = FALSE; [iO$ c]!H
m_Path = _T("c:\\"); ,;+91lR3
m_Number = _T("0 picture captured."); P(YG@
nCount=0; NP<F==,
bRegistered=FALSE; HIWmh4o/.
bTray=FALSE; zw%n!wc_\
//}}AFX_DATA_INIT Aa\=7
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $<>EwW
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); bVAgul=__
} %t5BB$y
bCaPJ!ZO
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4HJZ^bq9|
{ +DbWMm
CDialog::DoDataExchange(pDX); "o5gQTwb
//{{AFX_DATA_MAP(CCaptureDlg) mC[U)` ey
DDX_Control(pDX, IDC_KEY, m_Key); 9Qs"X7iH
DDX_Check(pDX, IDC_CONTROL, m_bControl); yV+ E;
DDX_Check(pDX, IDC_ALT, m_bAlt); nTlv'_Y(
DDX_Check(pDX, IDC_SHIFT, m_bShift); &T|&D[@
DDX_Text(pDX, IDC_PATH, m_Path); u8k{N
DDX_Text(pDX, IDC_NUMBER, m_Number); 5{d9,$%8&
//}}AFX_DATA_MAP ,Dii?P
} [K4+G]6
0Z);.l^
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) h,WY2Hr
//{{AFX_MSG_MAP(CCaptureDlg) +GPT:\*q6
ON_WM_SYSCOMMAND() ,;=( )-
ON_WM_PAINT() ;MRC~F=
ON_WM_QUERYDRAGICON()
;~gd<KK
ON_BN_CLICKED(ID_ABOUT, OnAbout) cf[u%{
6Y
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $ DZQdhv
ON_BN_CLICKED(ID_CHANGE, OnChange)
1N$gE
//}}AFX_MSG_MAP ]Re~V{uh
END_MESSAGE_MAP() sG1]A:_<C
ap$tu3j
BOOL CCaptureDlg::OnInitDialog() (HrkUkw
{ N5 rG.6K
CDialog::OnInitDialog(); i\Q"a B"r
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); c]>&6-;rf
ASSERT(IDM_ABOUTBOX < 0xF000); >2Qqa;nx|
CMenu* pSysMenu = GetSystemMenu(FALSE); PVkN3J
if (pSysMenu != NULL) (P>eWw\0
{ o"ah\"#el
CString strAboutMenu; ~ Dp:j*H
strAboutMenu.LoadString(IDS_ABOUTBOX); #G ,
*j
if (!strAboutMenu.IsEmpty()) Pdm6u73
{ L..X)-D2n
pSysMenu->AppendMenu(MF_SEPARATOR); `2(R}zUHN
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); D"] [&m
} 9M7(_E;)B
} t{S{!SF4
SetIcon(m_hIcon, TRUE); // Set big icon
$Z%aGc*
SetIcon(m_hIcon, FALSE); // Set small icon M}oFn}-T9a
m_Key.SetCurSel(0); gM5p1?E
RegisterHotkey(); X,Q=n2X?3
CMenu* pMenu=GetSystemMenu(FALSE); tId !C
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); IL6f~!
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "k1Tsd-
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); =@jMx^A"
return TRUE; // return TRUE unless you set the focus to a control %`\_l
} mv%:[+!
4@mXtA
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) }
@fu~V/
{ M+R)P+
if ((nID & 0xFFF0) == IDM_ABOUTBOX) j.'"CU
{ \`p~b(
CAboutDlg dlgAbout; FvNSu"O~K1
dlgAbout.DoModal(); v.LUK
} wAOVH].
else V&+$Vq
{ eeJt4DV8v
CDialog::OnSysCommand(nID, lParam); B%g :Z
} :k )<1ua
} eZod}~J8
ocuVDC
void CCaptureDlg::OnPaint() |o=\9:wV
{ !>2\OSp!
if (IsIconic()) v{{2<,l
{ hYUV9k:
CPaintDC dc(this); // device context for painting 73z|'0.
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); vwH7/+
// Center icon in client rectangle .q9|XDqQc
int cxIcon = GetSystemMetrics(SM_CXICON); $E,DxDT
int cyIcon = GetSystemMetrics(SM_CYICON); HJ1\FO9\
CRect rect; +$QL0|RL
GetClientRect(&rect); '/Cz{<,
int x = (rect.Width() - cxIcon + 1) / 2; Ce'2lo
int y = (rect.Height() - cyIcon + 1) / 2; . nF
// Draw the icon kq.h\[
dc.DrawIcon(x, y, m_hIcon); AW&s-b%P
} l
75{JxZX
else O-lh\9{'R
{ OZ14-}Lr5
CDialog::OnPaint(); U>-#('
} |Sv #f2`
} 2[&-y[1
$~@096`QL<
HCURSOR CCaptureDlg::OnQueryDragIcon() PW//8lsR
{ >Wit"p
return (HCURSOR) m_hIcon; ZFuJ2 :
} @$yYljP
cTaD{!zm5
void CCaptureDlg::OnCancel() ?| LB:8
{ hGo|2@sc
if(bTray) f uNXY-;
DeleteIcon(); 34^Cfh
CDialog::OnCancel(); 9c %Tv
} cASHgm
+M]8_kE=+l
void CCaptureDlg::OnAbout() S=amj cC
{ |j}F$*SE[
CAboutDlg dlg; ,Y8X"~{A
dlg.DoModal(); 10 H!
} qq_,"~
^`MDP`M;
void CCaptureDlg::OnBrowse() ~d `4W<1a
{ ;GT)sI
CString str; Jb.u^3R@
BROWSEINFO bi; UYrzsUjg&
char name[MAX_PATH];
yi;t
ZeroMemory(&bi,sizeof(BROWSEINFO)); &FF. Ddt{
bi.hwndOwner=GetSafeHwnd(); ?[B[ F
bi.pszDisplayName=name; 2\tjeg
bi.lpszTitle="Select folder"; htrj3$q(4
bi.ulFlags=BIF_RETURNONLYFSDIRS; M>gZVB,eP>
LPITEMIDLIST idl=SHBrowseForFolder(&bi); T<?BIQz(}
if(idl==NULL) +*{5ORq=
return; <slq1
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); KmOa^vY1.T
str.ReleaseBuffer(); >D4Ez
m_Path=str; 6jo&i
if(str.GetAt(str.GetLength()-1)!='\\') B]F7t4Y!
m_Path+="\\"; "I FGW4FnL
UpdateData(FALSE); $cU/Im`
} R,+(JgJ
Byj~\QMD|
void CCaptureDlg::SaveBmp() rK)
{ pP,bW~rk
CDC dc; HYmUxheN2
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Hll}8d6[
CBitmap bm; Ht^2)~e~:
int Width=GetSystemMetrics(SM_CXSCREEN); Py]ci`27
int Height=GetSystemMetrics(SM_CYSCREEN); c!^}!32j)
bm.CreateCompatibleBitmap(&dc,Width,Height); =T4w:
CDC tdc; s;WCz
tdc.CreateCompatibleDC(&dc); ucP MT0k
CBitmap*pOld=tdc.SelectObject(&bm); N`6|Y
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,6Q-k4_
tdc.SelectObject(pOld); l*H"]6cXRL
BITMAP btm; n1(X%%2
bm.GetBitmap(&btm); &)jZ|Q~
DWORD size=btm.bmWidthBytes*btm.bmHeight; K)\gbQ|
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); m9cT}x&j
BITMAPINFOHEADER bih; r['C.S6
bih.biBitCount=btm.bmBitsPixel; 6|cl`}g_j
bih.biClrImportant=0; t3g!5
bih.biClrUsed=0; i4rF~'h@
bih.biCompression=0; lB~'7r`
bih.biHeight=btm.bmHeight; $i>VI
bih.biPlanes=1; M?zAkHNS$
bih.biSize=sizeof(BITMAPINFOHEADER); P$Ru NF
bih.biSizeImage=size; a\_,_psK
bih.biWidth=btm.bmWidth; |raQ]b@t&
bih.biXPelsPerMeter=0; beZ| i 1:
bih.biYPelsPerMeter=0; n`Iy7X
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3*2pacHpE
static int filecount=0; (r\h dLX
CString name; MXV4bgltT
name.Format("pict%04d.bmp",filecount++); 3~xOO*`o
name=m_Path+name; nn%xN\~<
BITMAPFILEHEADER bfh; D~&e.y/gHN
bfh.bfReserved1=bfh.bfReserved2=0; &~f_1<
bfh.bfType=((WORD)('M'<< 8)|'B'); )1
j2
bfh.bfSize=54+size; !OgoV22
bfh.bfOffBits=54; [`\Qte%UH
CFile bf; 'FFc"lqj
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ :K:gyVrC
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .Kwl8xRg
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ]_8 \g`"u
bf.WriteHuge(lpData,size); 3y ,?>-
bf.Close(); 7'uc;5:
nCount++; !I_4GE,
} @{lnfOESl
GlobalFreePtr(lpData); uZI a-b
if(nCount==1) N&`ay{&`:
m_Number.Format("%d picture captured.",nCount); UOOme)\>
else :XZ
pnjj
m_Number.Format("%d pictures captured.",nCount); 1Di&vpn0u
UpdateData(FALSE); uK5x[m
} Mwc3@
{2@96o2}
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) jMbK7
1K%
{ g>zL{[e!
if(pMsg -> message == WM_KEYDOWN) LWV`xCr8R
{ -;"l5oX
if(pMsg -> wParam == VK_ESCAPE) J[wXG6M
return TRUE; 1_lL?S3,a@
if(pMsg -> wParam == VK_RETURN) -1JHhRr]
return TRUE; u`|fmVI
} \]%U?`A
return CDialog::PreTranslateMessage(pMsg); B4aZ3.&W
} 3/FB>w gt
oD\+ 5[x
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O_^h 7
{ >O~5s.1u
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ nVzo=+Yp
SaveBmp(); '7s!NF2
return FALSE; 54w-yY
} a"0~_=
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Shz;)0To
CMenu pop; m@~x*+Iz
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); U2$T}/@
CMenu*pMenu=pop.GetSubMenu(0); I r~X#$Upc
pMenu->SetDefaultItem(ID_EXITICON); d*L'`BBsp
CPoint pt; sXu+F2O
GetCursorPos(&pt); dZmq
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); y>8?RX8
if(id==ID_EXITICON) q3`t0eLZ
DeleteIcon(); o:<3n,T
else if(id==ID_EXIT) ^dv>n]?
OnCancel(); jq{Ix
return FALSE; 2wQ
CQ"
} >qA&;M
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]mA?TwD
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) U w"
AddIcon(); Xk'.t|
return res; `l#g`~L
} 8t%1x|!
a0.XJR{T"
void CCaptureDlg::AddIcon() G\%hT5^
{ za7wNe(s
NOTIFYICONDATA data; _wCSL.
data.cbSize=sizeof(NOTIFYICONDATA); t/|^Nt@XT
CString tip; Di*>PE@
tip.LoadString(IDS_ICONTIP); if>] )g2lr
data.hIcon=GetIcon(0); v*3:8Y,
data.hWnd=GetSafeHwnd(); uE(w$2Wi
strcpy(data.szTip,tip); 1CbC|q
data.uCallbackMessage=IDM_SHELL; ~_%[j8o&l
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; u:ISwAp
data.uID=98; :%{7Q$Xv<
Shell_NotifyIcon(NIM_ADD,&data); Kl? 1)u3^4
ShowWindow(SW_HIDE); {NR~>=~K-
bTray=TRUE; rNc>1}DDS
} *F0N'*
iQF93:#
void CCaptureDlg::DeleteIcon() B|v
fkX2f
{ d@hJ=-4
NOTIFYICONDATA data; 16vfIUtb
data.cbSize=sizeof(NOTIFYICONDATA); #x21e }Li
data.hWnd=GetSafeHwnd(); K-ebAaiC
data.uID=98; z61
o6mb
Shell_NotifyIcon(NIM_DELETE,&data); $G3P3y:
[
ShowWindow(SW_SHOW); -|mABHjx*
SetForegroundWindow(); *?{)i~
ShowWindow(SW_SHOWNORMAL); Wm 61
bTray=FALSE; s/V[tEC*z
} t&_lpffv
#LiC@>
void CCaptureDlg::OnChange() RMXP)[
{ \B)<<[ $
RegisterHotkey(); UWI5/R
} =E}/Z
GfDA5v[
BOOL CCaptureDlg::RegisterHotkey() @
55Y2
{ ',f[y:v;
UpdateData(); U|=y&a2Rb
UCHAR mask=0; *"@P2F&
UCHAR key=0; I,D=ixK
if(m_bControl) eC?N>wHH
mask|=4; /1*\*<cs
if(m_bAlt) Go4l#6
mask|=2; 5zU$_ M
if(m_bShift) o%:eYl
mask|=1; g:HIiGN0Ic
key=Key_Table[m_Key.GetCurSel()]; 2sngi@\
if(bRegistered){ P+[R 0QS
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8MIHp[vm%
bRegistered=FALSE; Ne%X:h
} T~la,>p|}
cMask=mask; c}A^0,"z>
cKey=key; AOpfByw
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); fOfp.`n
return bRegistered; YpJzRm{Ra
} Hogr#Sn2
|c)#zSv
四、小结 ec|IT0;
%Xn)$Ti~<
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。