IOS 微信客户端调用统一下单接口签名错误解决
由于后台没有时间，所以只能前端自己调用统一下单接口获取预支付订单然后进行支付。
签名检验工具地址https://api.mch.weixin.qq.com/pay/unifiedorder
随机字符串方法：
-(NSString *)ret32bitString{
char data[32];
for (int x=0;x<32;data[x++] = (char)('A' + (arc4random_uniform(26))));
return [[NSString alloc] initWithBytes:data length:32 encoding:NSUTF8StringEncoding];
}
md5加密算法：
- (NSString *) md5:(NSString *) input {
const char *cStr = [input UTF8String];
unsigned char digest[CC_MD5_DIGEST_LENGTH];
CC_MD5( cStr, (CC_LONG)strlen(cStr), digest ); // This is the md5 call 需要导入头文件#import
NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
[output appendFormat:@"%02x", digest[i]];
return [output uppercaseString]; //转化为大写
}
通过我的踩坑处了文档中的几条注意事项还有几个别的原因：
1.一定要确认key是商户平台的api密钥。
2.一定要注意总金额total_fee是分不是元我被坑惨了在这！！！（跟支付宝一块做的所以在金额这没在意，哎都是泪！）
总之一句话：文档一定要认真查看别放过任何细节，文档！文档！文档！重要的事情说三遍！
客户端调用微信支付问题
可能被忽略的问题就是需要把参数再次签名
需要签名的参数是这几个:
参数签名的代码：
PayReq *request = [[PayReq alloc] init];
request.partnerId = MCH_ID;
request.prepayId = dicModel.prepay_id;
request.package = @"Sign=WXPay";
request.nonceStr = dicModel.nonce_str;
NSTimeInterval a = [[NSDate date] timeIntervalSince1970];
NSString *timeString = [NSString stringWithFormat:@"%.0f", a];
request.timeStamp = [timeString intValue];
NSDictionary *dicsign = @{@"appid":WECHATKEY,
@"partnerid":request.partnerId,
@"prepayid":request.prepayId,
字符串升序排序代码：
#pragma mark 字符串排序生序排列
- (NSString *)dicZhuanString:(NSDictionary *)dicInfo {
// NOTE: 排序，得出最终请求字串
NSArray* sortedKeyArray = [[dicInfo allKeys] sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
return [obj1 compare:obj2];
}];
NSMutableArray *tmpArray = [NSMutableArray new];
for (NSString* key in sortedKeyArray) {
NSString* orderItem = [self orderItemWithKeyPay:key andValue:[dicInfo objectForKey:key] encoded:NO];
if (orderItem.length > 0) {
[tmpArray addObject:orderItem];
}
}
return [tmpArray componentsJoinedByString:@"&"];
}
- (NSString*)orderItemWithKeyPay:(NSString*)key andValue:(NSString*)value encoded:(BOOL)bEncoded
{
if (key.length > 0 && value.length > 0) {
if (bEncoded) {
value = [self encodeValues:value];
}
return [NSString stringWithFormat:@"%@=%@", key, value];
}
return nil;
}
- (NSString*)encodeValues:(NSString*)value
{
NSString* encodedValue = value;
if (value.length > 0) {
encodedValue = (__bridge_transfer NSString*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (__bridge CFStringRef)value, NULL, (__bridge CFStringRef)@"!*'();:@&=+$,/?%#[]", kCFStringEncodingUTF8 );
}
return encodedValue;
}
