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:
t7sEY
8.7q
-<Q 一、实现方法
;DVg[# :^xNHMp! 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:
*[BtW56- P=\Hi.]% #pragma data_seg("shareddata")
g W9`k,U HHOOK hHook =NULL; //钩子句柄
R,=8)OI2 UINT nHookCount =0; //挂接的程序数目
q">}3`k static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
zjSl;ru static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
7zJ2n/`m* static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
IN;9p w static int KeyCount =0;
`&xdS H static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Uj3HAu #pragma data_seg()
!c-MC| wzJdS}Yy!y 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。
qDhZC*"9#D X8?@Y@ 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:
AZA5>Y @$
lX%p> BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
g jzWW0C cKey,UCHAR cMask)
Dhfor+Epy {
6pfkv2.} BOOL bAdded=FALSE;
&GvSgdttv for(int index=0;index<MAX_KEY;index++){
~l{Qz0& if(hCallWnd[index]==0){
W}}ZP]; hCallWnd[index]=hWnd;
! hEZV&y HotKey[index]=cKey;
nZc6
*jiz HotKeyMask[index]=cMask;
m_BpY9c]5 bAdded=TRUE;
7Kb&BF|Q KeyCount++;
U>m{B|H break;
]=I2:Rb }
,dw\y/dn }
{;zHkmx return bAdded;
o@]n<ZYo }
_x#y //删除热键
bAuiMw7! BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
V[kn'QkWv {
0uPcEpIA BOOL bRemoved=FALSE;
jG)66E*" for(int index=0;index<MAX_KEY;index++){
Y9vVi]4 if(hCallWnd[index]==hWnd){
*yo'Nqu if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
-yg;,nCg hCallWnd[index]=NULL;
yOvV"x] HotKey[index]=0;
DIWyv- HotKeyMask[index]=0;
,j\uvi(Y bRemoved=TRUE;
v0tFU!Q% KeyCount--;
yf`_?gJ6d break;
Gm=&[?} }
l @@pXg3 }
^P/OHuDL }
w}t}Sh return bRemoved;
mqUDve( }
!dcvG9JZ |ITb1O`_P @~N"MsF3 DLL中的钩子函数如下:
gTB|IcOs b`^?nD7 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
8x7TK2r {
[;F!\B- BOOL bProcessed=FALSE;
<S6?L[_ if(HC_ACTION==nCode)
hNgT/y8 {
!W0JT#0 if((lParam&0xc0000000)==0xc0000000){// 有键松开
7.g,&s%q switch(wParam)
X}C8!LA {
.*>C[^ case VK_MENU:
X.,R%>O}`P MaskBits&=~ALTBIT;
a|3+AWL% break;
>9#) obw case VK_CONTROL:
=?wDQ: MaskBits&=~CTRLBIT;
px+]/P<dX break;
},Grg~l case VK_SHIFT:
6"}F
KRR MaskBits&=~SHIFTBIT;
a>,_o(]cW break;
t7xJ" default: //judge the key and send message
qs_cC3"=%= break;
Nlwt}7 }
Z("N
*`VP; for(int index=0;index<MAX_KEY;index++){
\_(0V" if(hCallWnd[index]==NULL)
qNrLM!Rj continue;
Fl{~#] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
xy$aFPH!- {
T?.l_"%%d SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
D+ jvF bProcessed=TRUE;
:P+7ti@ }
0JR)-* }
)"M;7W?R0 }
XtBEVqrhi else if((lParam&0xc000ffff)==1){ //有键按下
R"CF xo switch(wParam)
`zl,|}u) {
g}a+%Obb case VK_MENU:
OPqhdqo MaskBits|=ALTBIT;
",,.xLI7 break;
Q^l!cL| { case VK_CONTROL:
Ah5o>ZtcO MaskBits|=CTRLBIT;
T-kHk( break;
w-v8P`V case VK_SHIFT:
1 <lfo^B MaskBits|=SHIFTBIT;
2\+N<-(F5 break;
2.v`J=R default: //judge the key and send message
$M4_"!
break;
2_?VR~mA# }
}XpZgd$ for(int index=0;index<MAX_KEY;index++){
,+gtr. if(hCallWnd[index]==NULL)
K]7[|qf& continue;
r~fnK%| if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
)qFqf<:yc {
*p0n^XZ% ? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
8. +f@wv bProcessed=TRUE;
Fy$C._C$ }
T<yfpUzX }
~G6xk/+n-m }
kXUJlLod if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
cSG(kFQ for(int index=0;index<MAX_KEY;index++){
> #9
a&O if(hCallWnd[index]==NULL)
BrzTOkeyG continue;
j/E(*Hv if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
J\'f5)k SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
bS55/M w //lParam的意义可看MSDN中WM_KEYDOWN部分
^U,C])n }
a_b+RMy }
By}ZHK94I }
,,#6SR(n return CallNextHookEx( hHook, nCode, wParam, lParam );
%P#|
} }
a8k`Wog {c drMP@"" 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:
K!E\v4 p_apVm\t_ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
f6Y-ss;' BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
F%%mcmHD# wZ`{ i 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:
[kgCB7.V H&k&mRi LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
G'nSnw {
1UB.2}/: if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
B/hQvA;( {
MD,BGO?C //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
5C*-v,hF SaveBmp();
G- ]_
d return FALSE;
Cyg(~7] }
NPa4I7`A …… //其它处理及默认处理
U56g|V }
r(n>N0:0Ls v6=X]Ji{YA "(';UFa 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。
pB%oFWqK 6KN6SN$ 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。
zd F;! &Fk|"f+ 二、编程步骤
X .K*</(g :inVwc 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";
RcO.1@2 [?2?7>D8 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
u'Hh||La" F)/4#[ 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;
N1vA>(2A <5ULu(b&$ 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;
7v.O Lp evVxzU& 5、 添加代码,编译运行程序。
8S[bt@v 9c{ ~$zJW 三、程序代码
o{mVXidE ^b= ; ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
lx?v
.:zl\ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
#}tdA(
- #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
dWhqu68_ #if _MSC_VER > 1000
#AO}JP #pragma once
2G3Hi;q18 #endif // _MSC_VER > 1000
!l6ht{ #ifndef __AFXWIN_H__
Un5 AStG #error include 'stdafx.h' before including this file for PCH
AkO-PL #endif
a,fcR< #include "resource.h" // main symbols
C!^;%VQ}d class CHookApp : public CWinApp
=i/r: {
]{ch]m public:
tWTC'Gx-J CHookApp();
\3F)M`g // Overrides
bIV9cpW // ClassWizard generated virtual function overrides
Mdu\ci)lr //{{AFX_VIRTUAL(CHookApp)
,.<c|5R public:
BcQw-<veu virtual BOOL InitInstance();
X %7l!
k[ virtual int ExitInstance();
RYl\Q,# //}}AFX_VIRTUAL
4 .(5m\s! //{{AFX_MSG(CHookApp)
aH,NS
// NOTE - the ClassWizard will add and remove member functions here.
%[ o($a$ // DO NOT EDIT what you see in these blocks of generated code !
'#QZhz(+ //}}AFX_MSG
q+w] Xs; DECLARE_MESSAGE_MAP()
fM*aZc*Y };
eqWs(` LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
TA#pA(k BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
h 3 J& BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Q,ZV C BOOL InitHotkey();
n#
FkgXP$ BOOL UnInit();
._.Qf<7 #endif
Yb:F,d-Ya swLNNA. //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
'Q.5`o #include "stdafx.h"
0AhUH|] #include "hook.h"
k#p6QAhS #include <windowsx.h>
'RV wxd #ifdef _DEBUG
A43[i@o #define new DEBUG_NEW
Kc>Rd #undef THIS_FILE
\vW'\} static char THIS_FILE[] = __FILE__;
{L M Q #endif
/}5)[9GC #define MAX_KEY 100
Q}g"pl #define CTRLBIT 0x04
]^@m $O #define ALTBIT 0x02
PevT`\> #define SHIFTBIT 0x01
WO^]bR #pragma data_seg("shareddata")
v sYbR3O HHOOK hHook =NULL;
_m%Ab3iT~ UINT nHookCount =0;
9.6ni1a' static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
)2:U]d%pk static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
6/Z_r0^O static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
IhK%.B{dZ static int KeyCount =0;
"|PX5 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
~C?)-
]bF #pragma data_seg()
KHeeB `V>J HINSTANCE hins;
7!6v4ZA void VerifyWindow();
y+Bxe)6^V BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
)cm^;(#pV //{{AFX_MSG_MAP(CHookApp)
)R"UX:Q> // NOTE - the ClassWizard will add and remove mapping macros here.
zzT4+wy` // DO NOT EDIT what you see in these blocks of generated code!
r8o^8 . //}}AFX_MSG_MAP
?|n @%' END_MESSAGE_MAP()
vOtILL6 >V>GiSni CHookApp::CHookApp()
%V#? 1{ {
0P;LH3sx // TODO: add construction code here,
Nlu]f-i': // Place all significant initialization in InitInstance
t^~itlE{ }
r[2*K 9 0}g~69Z1= CHookApp theApp;
T?7++mcA LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
t\n'Kuk` {
2>Qy* BOOL bProcessed=FALSE;
[X@JH6U
r if(HC_ACTION==nCode)
DJ!pZUO{ {
Pup%lO`.0 if((lParam&0xc0000000)==0xc0000000){// Key up
=n8M' switch(wParam)
6O*lZNN {
>.hDt9@4 case VK_MENU:
M{YN^
Kk MaskBits&=~ALTBIT;
(/!zHq break;
!d95gq<=> case VK_CONTROL:
\|Y_,fi MaskBits&=~CTRLBIT;
5wv7]F< break;
! 'Hd:oD< case VK_SHIFT:
V&lx0Dy MaskBits&=~SHIFTBIT;
mRC break;
V2'5doo default: //judge the key and send message
hXD/ break;
6E_YUk?KW }
=(v'8?-- for(int index=0;index<MAX_KEY;index++){
!3z
;u8W if(hCallWnd[index]==NULL)
Qzv& continue;
"#w%sG^_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
v:NQrN {
IL"N_ux~w~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
H,LJ$
py bProcessed=TRUE;
U~oGg$ }
[Y^h)k{-$ }
}gd'pgN"t }
Z,8t!Y else if((lParam&0xc000ffff)==1){ //Key down
*lQa^F switch(wParam)
CKC5S^Mx {
A5sz[k case VK_MENU:
J58S8:c MaskBits|=ALTBIT;
^RYq !l$ break;
Nc?'}, case VK_CONTROL:
3L{)Y`P MaskBits|=CTRLBIT;
lA4TWU (] break;
n`T4P$pt case VK_SHIFT:
? ^`fPH= MaskBits|=SHIFTBIT;
dKa2_|k' break;
r5NH*\Q default: //judge the key and send message
}$(\,SzW break;
Fj"/jdM }
pfFHuS~ for(int index=0;index<MAX_KEY;index++)
|ZOdfr4uW {
9xFI%UOb# if(hCallWnd[index]==NULL)
t~8H~%T>v continue;
vD(:?M if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
+ 7wMM#z {
p+b$jKWQ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Hk=HO|&<XB bProcessed=TRUE;
r4b-.>w }
S7~HBgS< }
}eveNPB{5 }
j@{dsS:6 if(!bProcessed){
.-Dc%ap] for(int index=0;index<MAX_KEY;index++){
al7D3J if(hCallWnd[index]==NULL)
>qd=lm <, continue;
buhbUmQ2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Q&/WVRD SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
i4&V+h" }
]<C]&03)) }
1Afy$It/{ }
j}6h}E&dEr return CallNextHookEx( hHook, nCode, wParam, lParam );
V~do6[( }
tjx|;m7 ZEvK BOOL InitHotkey()
jWdZ]0m {
g2A#BMe'.$ if(hHook!=NULL){
>B;KpO"+m nHookCount++;
+ f:!9)C return TRUE;
nwIj?(8x }
(;-_j/ else
$xjfW/k?M hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Np/vPaAk if(hHook!=NULL)
zV(aw~CbZ nHookCount++;
Ty7)j]b"zl return (hHook!=NULL);
VCvf'$4(X }
c:<a"$ BOOL UnInit()
A8Km8" {
: t/0 if(nHookCount>1){
%P:|B:\< nHookCount--;
P!!O~P return TRUE;
{CNJlr@z }
@a,=ApS" BOOL unhooked = UnhookWindowsHookEx(hHook);
,LDL%<7t if(unhooked==TRUE){
0Gu?;]GSv nHookCount=0;
X-J85b_e hHook=NULL;
NQqNBI?cr }
Mc$rsqDz return unhooked;
1/K1e$r }
=d]}7PO~ [jrfh>v BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Gl[1K/,* {
XL'\$f BOOL bAdded=FALSE;
?Mn~XN4F_ for(int index=0;index<MAX_KEY;index++){
{dn:1IcN if(hCallWnd[index]==0){
l}&2A*c. hCallWnd[index]=hWnd;
M0OIcMTv HotKey[index]=cKey;
k4E9=y? HotKeyMask[index]=cMask;
,s2C)bb- bAdded=TRUE;
gyhy0 KeyCount++;
\,r*-jr break;
0j8`M"6 }
afzx?ekdF }
?e,:x ]\L return bAdded;
>y(loMl }
1b 2 =E^/gc%X BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
0Ng?U+6 {
M^>l>?#rl BOOL bRemoved=FALSE;
lcgG5/82 for(int index=0;index<MAX_KEY;index++){
L4bYVTm| if(hCallWnd[index]==hWnd){
yrl7 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
WNKg>$M hCallWnd[index]=NULL;
B<n[yiJ} HotKey[index]=0;
7S=,# HotKeyMask[index]=0;
TQ0ZBhd bRemoved=TRUE;
_6'@#DN KeyCount--;
5UG9&:zu'V break;
]lqZ9rO }
OhlK;hvdB* }
{TdxsE> }
1LAd5X return bRemoved;
"fUNrhCx }
xq=!1> #kA?*i[T void VerifyWindow()
\u))1zRd {
&\b( for(int i=0;i<MAX_KEY;i++){
g1.u1} if(hCallWnd
!=NULL){ }^j8<
if(!IsWindow(hCallWnd)){ `l/nAKg?W
hCallWnd=NULL; LsaX
HI/?b
HotKey=0; :8==Bu
HotKeyMask=0; >Gk<a
KeyCount--; po,Ue>n/
} %[M0TE=J
}
Gv}Q/v
} H)EL0
Kv/
} GIn%yB'
{2q0Ko<
BOOL CHookApp::InitInstance() 8eYEi
{ =tP^vgfQ
AFX_MANAGE_STATE(AfxGetStaticModuleState()); r/"^{0;F{W
hins=AfxGetInstanceHandle(); pU'>!<zGr
InitHotkey(); _Hfpizm
return CWinApp::InitInstance(); 5`g VziS!S
} }V`_(%Q-e
MNb9 ~kM
int CHookApp::ExitInstance() x$D^Bh,
{ 9yWf*s<
VerifyWindow(); I,HtW ),
UnInit(); _ qwf3Q@
return CWinApp::ExitInstance(); *N:0L,8
} *+2_!=4V
@!O(%0
=
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file DT)][V^w
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) %<[{zd1C-
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ r;*
|^>
#if _MSC_VER > 1000 z8]@Gh+
(
#pragma once cAot+N+9|]
#endif // _MSC_VER > 1000 0a#v}w^*
OLm@-I*
class CCaptureDlg : public CDialog n;$u%2 t2
{ yWE\)]9
// Construction D
.LR-Z
public: /!A"[Tyt
BOOL bTray; 4[MTEBx
BOOL bRegistered; kv, !"<
BOOL RegisterHotkey(); hvNK"^\p
UCHAR cKey; (2M00J-o
UCHAR cMask; /c 7z[|
void DeleteIcon(); +R HiX!PG
void AddIcon(); \~(kGE--+
UINT nCount; ,Z _@]D@
void SaveBmp(); 3S2Alx!6
CCaptureDlg(CWnd* pParent = NULL); // standard constructor #7}M\\$M
// Dialog Data y'I
m/{9U
//{{AFX_DATA(CCaptureDlg) %#eQN
~
enum { IDD = IDD_CAPTURE_DIALOG }; A'b$X1h
CComboBox m_Key; 8"g+
k`PRy
BOOL m_bControl; ?Tu=-ppw
BOOL m_bAlt; N- knhA
BOOL m_bShift; " zD9R4\X.
CString m_Path; SK^(7Ws~0
CString m_Number; R8eBIJ/@_
//}}AFX_DATA {;& U5<NO
// ClassWizard generated virtual function overrides Y~A I2H S
//{{AFX_VIRTUAL(CCaptureDlg) Az8ZA ~Op=
public: QV:> x#=V
virtual BOOL PreTranslateMessage(MSG* pMsg); SE@TY32T
protected: OdY9g2y#m
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $C fp1#
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); JMo r[*
//}}AFX_VIRTUAL (w5cp!qW9J
// Implementation Q^nfD
protected: cfa1"u""e
HICON m_hIcon; B@0#*I
Rm
// Generated message map functions ~> lqEa
//{{AFX_MSG(CCaptureDlg) "VSx?74q
virtual BOOL OnInitDialog(); Ak('4j!*}^
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); [u2t1^#Ol
afx_msg void OnPaint(); NCG;`B`i
afx_msg HCURSOR OnQueryDragIcon(); 92A9gY
virtual void OnCancel(); 8wOscL f:
afx_msg void OnAbout(); bHE.EBZ
afx_msg void OnBrowse(); Y)1J8kq_
afx_msg void OnChange(); qGEp 6b H
//}}AFX_MSG a%si:_
DECLARE_MESSAGE_MAP() \4G9YK-N>
}; (l-=/6-
#endif Zl3e=sg=
~yw]<{ ?
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~LV]cX2J(
#include "stdafx.h" >dm9YfQ
#include "Capture.h" m*N8!1Ot
#include "CaptureDlg.h" ]H}2|~c
#include <windowsx.h> 0'$67pY
#pragma comment(lib,"hook.lib") |Rkw/5
#ifdef _DEBUG K/f-9hE F
#define new DEBUG_NEW 5|K[WvG@Co
#undef THIS_FILE 5V =mj+X?
static char THIS_FILE[] = __FILE__; r~f;g9I
#endif V@-Q&K#
#define IDM_SHELL WM_USER+1 Hv^Bw{"/R
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2zh-ms
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tp7$t#
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; at@tS>Dv
class CAboutDlg : public CDialog R#;xBBt8
{ (B\
UZb
public: ~h
Dp-R;
CAboutDlg(); aEIz,^3
// Dialog Data JJ_Z{
//{{AFX_DATA(CAboutDlg) ~S;-sxoO0l
enum { IDD = IDD_ABOUTBOX }; Q>Z~={"
//}}AFX_DATA Pvi2j&W84
// ClassWizard generated virtual function overrides ([>__c/Nd
//{{AFX_VIRTUAL(CAboutDlg)
J9*;Bqzim
protected: )lS04|s
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `NgQ>KV!
//}}AFX_VIRTUAL _LC*_LT_
// Implementation v G\J8s
protected: 37a1O>A
//{{AFX_MSG(CAboutDlg) z+6PVQ
//}}AFX_MSG A-=hvJ5T
DECLARE_MESSAGE_MAP() Xnjl {`
}; [w@S/K[_|
iO?^y(phC
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) C12V_)~2
{ |/n7(!7$[v
//{{AFX_DATA_INIT(CAboutDlg) ^tG,H@95
//}}AFX_DATA_INIT ly[dV.<P
} GuU-<*u(d
^GY^g-R
void CAboutDlg::DoDataExchange(CDataExchange* pDX) O)VcW/
{ *Ic^9njt
CDialog::DoDataExchange(pDX); 5!qf{4j
//{{AFX_DATA_MAP(CAboutDlg) *p\Zc*N;%
//}}AFX_DATA_MAP Kd+E]$F_OH
} m+s*Io{Ip
63Gq5dF
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) tNzO1BK
//{{AFX_MSG_MAP(CAboutDlg) HB5-B XBU
// No message handlers * BR#^Wt
//}}AFX_MSG_MAP %~Rg`+
END_MESSAGE_MAP() Zf!Q4a"
,;w~ VZ4
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Y]0c%Fd
: CDialog(CCaptureDlg::IDD, pParent) g*YA~J@
{ "D_:`@V(
//{{AFX_DATA_INIT(CCaptureDlg) 59l9_yFJ
m_bControl = FALSE; v:/!OvLe
m_bAlt = FALSE; X coPkW
m_bShift = FALSE; 2!B|w8ar
m_Path = _T("c:\\"); Q}lCQK/g
m_Number = _T("0 picture captured."); P<vU!`x%q
nCount=0; @- |G_BZ
bRegistered=FALSE; t7x<=rW7u
bTray=FALSE;
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//}}AFX_DATA_INIT L@AFt)U
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 J.4U;A5
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ]9/A=p?J@
} 8YlZ({f
HOWpTu(
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) %?gG-R
{ a"U3h[;$y
CDialog::DoDataExchange(pDX); -sJD:G,%
//{{AFX_DATA_MAP(CCaptureDlg) q&v~9~^}d
DDX_Control(pDX, IDC_KEY, m_Key); !10/M
DDX_Check(pDX, IDC_CONTROL, m_bControl); rmkBp_i{|
DDX_Check(pDX, IDC_ALT, m_bAlt); K\U`gTGc
DDX_Check(pDX, IDC_SHIFT, m_bShift); IMqe(
DDX_Text(pDX, IDC_PATH, m_Path); [iq^'E
DDX_Text(pDX, IDC_NUMBER, m_Number); |*g#7YL
//}}AFX_DATA_MAP Y3:HQ0w`|
} W)Y`8&,
aXVldt'
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) WcKDerc
//{{AFX_MSG_MAP(CCaptureDlg) ^" ?a)KC
ON_WM_SYSCOMMAND()
{q8|/{;
ON_WM_PAINT() :+jg311}
ON_WM_QUERYDRAGICON() `&q+ f+z
ON_BN_CLICKED(ID_ABOUT, OnAbout) {u1|`=;
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Lr*PbjQDIY
ON_BN_CLICKED(ID_CHANGE, OnChange) :K2
X~Ty
//}}AFX_MSG_MAP Bj\
x
END_MESSAGE_MAP() Ka(B&.
'{
=F/q
BOOL CCaptureDlg::OnInitDialog() P`Ku.
ONQ
{ %pjeA[-m#
CDialog::OnInitDialog(); IL.bwtpQD
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); #
2^H{7
ASSERT(IDM_ABOUTBOX < 0xF000); #`|Nm3b
CMenu* pSysMenu = GetSystemMenu(FALSE); V9"R8*@-
if (pSysMenu != NULL) ig.Z,R3@r
{ ^z)De+,!4
CString strAboutMenu; \HzmhQb+m
strAboutMenu.LoadString(IDS_ABOUTBOX); xtv%C
if (!strAboutMenu.IsEmpty()) ' abEY
{ ">wvd*w0"(
pSysMenu->AppendMenu(MF_SEPARATOR); "M
iJM+,
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); i&6U5Va,G
} 2H9hN4N
} ^ei[1#
SetIcon(m_hIcon, TRUE); // Set big icon *Ts$Hj[
SetIcon(m_hIcon, FALSE); // Set small icon Ff/Ap&0+
m_Key.SetCurSel(0); mTX:?>
RegisterHotkey(); UwS7B~
CMenu* pMenu=GetSystemMenu(FALSE); Q<V1`e
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Bcv{Y\x;ko
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND);
AjcKz
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); +:jonN9d
return TRUE; // return TRUE unless you set the focus to a control >uYQt~s
} 8493Sw
KM[0aXOtv
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) M}11 tUl
{ |A*4Fuc&
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 7=?!B#hm!
{ [#@lsI
CAboutDlg dlgAbout; qtAt=` s
dlgAbout.DoModal(); --l
UEo ~
} vJ&D>Vh4e
else ^\B4]'+^j
{ MFa/%O_*
CDialog::OnSysCommand(nID, lParam); zC)JOykI%
} oc,I,v
} l([aKm#
wMCg`rk
void CCaptureDlg::OnPaint() BSHS)_xs
{ #p*uk
if (IsIconic()) L)U*dY
{ ER9{D$
CPaintDC dc(this); // device context for painting BrSvkce
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); (kY0<
// Center icon in client rectangle S"G(_%
int cxIcon = GetSystemMetrics(SM_CXICON); uQ_C<ii"W
int cyIcon = GetSystemMetrics(SM_CYICON); xf;>o$oN0P
CRect rect; UJqh~s
GetClientRect(&rect); IowXVdm@6
int x = (rect.Width() - cxIcon + 1) / 2; +=9iq3<yfS
int y = (rect.Height() - cyIcon + 1) / 2; +zch e
// Draw the icon %eofG]VM<
dc.DrawIcon(x, y, m_hIcon); /Lr`Aka5
} *)w+xWmM3w
else %Jh(5
{ *Lz'<=DLoW
CDialog::OnPaint(); H:hM(m0?q
} Dmi.@.
} ZHZxr
, 2#Q>
HCURSOR CCaptureDlg::OnQueryDragIcon() l9|K,YVW
{ zT)cg$8%fY
return (HCURSOR) m_hIcon; .>TG{>sH
} Ua|iAD1
:X}SuM?c
void CCaptureDlg::OnCancel() lFtEQ '}
{ <FBH;}]
if(bTray) Fl($0}ER
DeleteIcon(); b1#C,UWK
CDialog::OnCancel(); rAHP5dx:
} p({@t=L3g
sdO8;v>
void CCaptureDlg::OnAbout() p: z][I
{ #Swc>jYc
CAboutDlg dlg; 0!YVRit\N
dlg.DoModal(); Heh&;c
} @ntwdv;
rz&V.,s
void CCaptureDlg::OnBrowse() iB
W:t
{ XZk%5t|t
CString str; XYP
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BROWSEINFO bi; q
j21#q
.
char name[MAX_PATH]; Peph..8 Z
ZeroMemory(&bi,sizeof(BROWSEINFO)); y>t:flD*
bi.hwndOwner=GetSafeHwnd(); PCaFG;}
bi.pszDisplayName=name; L`<#vi
bi.lpszTitle="Select folder"; WG A&Lr
bi.ulFlags=BIF_RETURNONLYFSDIRS; 46)[F0,$r
LPITEMIDLIST idl=SHBrowseForFolder(&bi); C TG^lms
if(idl==NULL) V2?{ebx`
return; yc]_ ?S>9
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "4WnDd5"
str.ReleaseBuffer(); [I%eRo[
m_Path=str;
W^^0Rh_
if(str.GetAt(str.GetLength()-1)!='\\') g,WTXRy
m_Path+="\\"; T2]8w1l&K
UpdateData(FALSE); 0$`pYW]
} 8i;drvf
^, =}'H]
void CCaptureDlg::SaveBmp() ~28{BY
{
[>GblL
CDC dc; ]aMDx>OE
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Jgr;'U$
CBitmap bm; ZhCz]z~tj6
int Width=GetSystemMetrics(SM_CXSCREEN); /cdLMm:
int Height=GetSystemMetrics(SM_CYSCREEN); 8wd["hga<%
bm.CreateCompatibleBitmap(&dc,Width,Height); 9+m>|"F0
CDC tdc; |7,$.MK-@
tdc.CreateCompatibleDC(&dc); DI;LhS*z
CBitmap*pOld=tdc.SelectObject(&bm); g&p(XuN
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); $~:ZzZO
tdc.SelectObject(pOld); cu5}(
BITMAP btm; mB0`>?#i
bm.GetBitmap(&btm); R&t2
DWORD size=btm.bmWidthBytes*btm.bmHeight; <75x@!
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); uy"i3xD6-
BITMAPINFOHEADER bih; Y{e,I-"{
bih.biBitCount=btm.bmBitsPixel; & ;5f/
bih.biClrImportant=0; e^~dx}X
bih.biClrUsed=0; 9.dZA9l@g
bih.biCompression=0; a>4q"IT6
bih.biHeight=btm.bmHeight; UK^w;w2F
bih.biPlanes=1; ]g9SUFM
bih.biSize=sizeof(BITMAPINFOHEADER); q'H6oD`
bih.biSizeImage=size; |j'@no_rv
bih.biWidth=btm.bmWidth; DC>?e[oOz
bih.biXPelsPerMeter=0; rr`_\ut
bih.biYPelsPerMeter=0; >clVV6B
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )cQ KR4x0^
static int filecount=0; Yy/,I]F
CString name; ;9)nG,P3
name.Format("pict%04d.bmp",filecount++); r`FTiPD.C
name=m_Path+name; ?$A)lWk(
BITMAPFILEHEADER bfh; S`mB1(h
bfh.bfReserved1=bfh.bfReserved2=0; 7`L]aRS[
bfh.bfType=((WORD)('M'<< 8)|'B'); 0hkYexX73
bfh.bfSize=54+size; ) xV>Va8)
bfh.bfOffBits=54; 9fbo
CFile bf; n@kJ1ee'
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ !}P^O(oY
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [m< jM[w{
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [W[awGf
bf.WriteHuge(lpData,size); aW|=|K
bf.Close(); EqD@o
nCount++; "S{GjOlEDF
} 8TH;6-RT
GlobalFreePtr(lpData); dQH8s
if(nCount==1) {7IZN< e
m_Number.Format("%d picture captured.",nCount); f9_Pn'"I
else !T)_(}|6}
m_Number.Format("%d pictures captured.",nCount); A;ZluQ
UpdateData(FALSE); K(MZ!>{
}
`_neYT
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) :G9d,B7*
{ dwvc;f-
if(pMsg -> message == WM_KEYDOWN) vfc5M6Vm)<
{ H
9/m6F
if(pMsg -> wParam == VK_ESCAPE) er
1zSTkg
return TRUE; Gz\wmH&rVz
if(pMsg -> wParam == VK_RETURN) =Ldf#8J
return TRUE; p|0SA=?k"
} >3 p8o@:
return CDialog::PreTranslateMessage(pMsg); *hFJI9G
} UDkH'x$=
+('xzW
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Xsb.xxK.
{ (Y&gse1}!
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ;gJAxVD<
SaveBmp(); IwbV+mWQ
return FALSE; Vfq-H /+
} 3M[d6@a
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ SJ8
~:"\P
CMenu pop; {KTZSs $n
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); hQzT
=0
CMenu*pMenu=pop.GetSubMenu(0); o4rf[.z
pMenu->SetDefaultItem(ID_EXITICON); bTYR=^9
CPoint pt; I)3LJK
GetCursorPos(&pt); {RsdI=%
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); rf^IJY[
if(id==ID_EXITICON)
's"aPqF?
DeleteIcon(); 0 >(hiTy<
else if(id==ID_EXIT) W1M Bk[:Q
OnCancel(); 4ee-tKH
return FALSE; 0Iyb}
} '|tmmoY6a:
LRESULT res= CDialog::WindowProc(message, wParam, lParam); / 8dRql-Ne
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) N^[MeG,8
AddIcon(); ] : ](xW%
return res; L)H/t6}i
} *&_(kq z'1
JGhK8E
void CCaptureDlg::AddIcon() GIkVU6Q}
{ U;
#v-'Z
NOTIFYICONDATA data; FV OPC:}bj
data.cbSize=sizeof(NOTIFYICONDATA); dt=M#+g
CString tip; UY\E uA9
tip.LoadString(IDS_ICONTIP); mX@xV*
data.hIcon=GetIcon(0); ncR]@8
data.hWnd=GetSafeHwnd(); 77]Fp(uI
strcpy(data.szTip,tip); k_OzkEM9!
data.uCallbackMessage=IDM_SHELL; ?%>S5,f_
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; A(C0/|#V
data.uID=98; ]>+ teG:4
Shell_NotifyIcon(NIM_ADD,&data); (3m^@2i
ShowWindow(SW_HIDE); 5S! !@P!,
bTray=TRUE; kf' 4C
"}
} ?O#"x{Pk
*2m{i:3
void CCaptureDlg::DeleteIcon() F'@[b
{ }f6_7W%5
NOTIFYICONDATA data; *@ S+J$
data.cbSize=sizeof(NOTIFYICONDATA); 2) Q/cH\g
data.hWnd=GetSafeHwnd(); Qyj:!-o
data.uID=98; 0bQ"s*K
Shell_NotifyIcon(NIM_DELETE,&data); @7?L+.r$9
ShowWindow(SW_SHOW); +'g~3A-G
SetForegroundWindow(); -0*z"a9<p8
ShowWindow(SW_SHOWNORMAL); DL '{
rK
bTray=FALSE; 7*Gg#XQ>(
} hus9Zv4
Hq <!&
void CCaptureDlg::OnChange() @w,O1Xwj
{ &X}i%etp^2
RegisterHotkey(); N/B-u)?\:
} O
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baR*4{]
BOOL CCaptureDlg::RegisterHotkey() ?*f2P T?`
{ 5W_Rg:J{P
UpdateData(); \q|<\~A
UCHAR mask=0; {k<mN
Y
UCHAR key=0; >
a 8'MK
if(m_bControl) A9y3B^\*
mask|=4; [_tBv" z
if(m_bAlt) mw${3j~&
mask|=2; R6irL!akAd
if(m_bShift) HAcC& s8
mask|=1; ? C6tYd
key=Key_Table[m_Key.GetCurSel()]; mx0EEU*
if(bRegistered){ 7Y1FFw|
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8SO(pw9
bRegistered=FALSE; 14 hE<u
} >yt8gw0J
cMask=mask; IKeO&]k
cKey=key; CGZ3-OW@E
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); V.kf@
return bRegistered; 5oY^;)\/
} f]kG%JEK
3ZL<6`Y F
四、小结 ^" UZ.@sq'
1>_2 =^[
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。